CN116037073A - Gel ball adsorbent for selective dephosphorization and preparation method and application thereof - Google Patents

Gel ball adsorbent for selective dephosphorization and preparation method and application thereof Download PDF

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CN116037073A
CN116037073A CN202310269336.7A CN202310269336A CN116037073A CN 116037073 A CN116037073 A CN 116037073A CN 202310269336 A CN202310269336 A CN 202310269336A CN 116037073 A CN116037073 A CN 116037073A
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gel
adsorbent
gel ball
selective
phosphorus
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赵丹丹
林苏丹
施雪卿
付辰
徐永智
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Qingdao University of Technology
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J20/00—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
    • B01J20/02—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material
    • B01J20/06—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material comprising oxides or hydroxides of metals not provided for in group B01J20/04
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J20/00—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
    • B01J20/22—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising organic material
    • B01J20/24—Naturally occurring macromolecular compounds, e.g. humic acids or their derivatives
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J20/00—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
    • B01J20/28—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof characterised by their form or physical properties
    • B01J20/28002—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof characterised by their form or physical properties characterised by their physical properties
    • B01J20/28004—Sorbent size or size distribution, e.g. particle size
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J20/00—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
    • B01J20/28—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof characterised by their form or physical properties
    • B01J20/28014—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof characterised by their form or physical properties characterised by their form
    • B01J20/28016—Particle form
    • B01J20/28019—Spherical, ellipsoidal or cylindrical
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J20/00—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
    • B01J20/28—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof characterised by their form or physical properties
    • B01J20/28014—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof characterised by their form or physical properties characterised by their form
    • B01J20/28047—Gels
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/28—Treatment of water, waste water, or sewage by sorption
    • C02F1/288—Treatment of water, waste water, or sewage by sorption using composite sorbents, e.g. coated, impregnated, multi-layered
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2101/00—Nature of the contaminant
    • C02F2101/10—Inorganic compounds
    • C02F2101/105—Phosphorus compounds

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  • Life Sciences & Earth Sciences (AREA)
  • Hydrology & Water Resources (AREA)
  • Engineering & Computer Science (AREA)
  • Environmental & Geological Engineering (AREA)
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  • Solid-Sorbent Or Filter-Aiding Compositions (AREA)

Abstract

The invention provides a gel ball adsorbent for selective dephosphorization, and a preparation method and application thereof. The preparation method of the invention comprises the following steps: nanometer yttrium oxide (Y) 2 O 3 ) Fully dispersing in water to obtain yttrium oxide dispersion liquid; adding Sodium Alginate (SA), and dissolving completely to obtain mixed solution; dropwise adding the mixed solution into CaCl 2 In the aqueous solution, gel balls are formed, and then the gel balls are washed to obtain the gel ball adsorbent. The preparation method is simple; the obtained adsorbent has good stability, can selectively and efficiently remove phosphate in water, and is easy to remove phosphate from waterThe separation process is simple.

Description

Gel ball adsorbent for selective dephosphorization and preparation method and application thereof
Technical Field
The invention belongs to the technical field of water treatment, and particularly relates to a gel ball adsorbent for selective dephosphorization and a preparation method and application thereof.
Background
Phosphorus (P) is one of the key elements necessary for life, but if the phosphorus content in water is too high, the water eutrophication and other problems can be caused, and the aquatic organisms and the water environment are seriously endangered. Phosphorus exists in a natural water environment mainly in the form of phosphate, and with rapid development of economy in recent years, products such as phosphorus-containing pesticides, fertilizers and detergents are widely applied to agriculture and industry, excessive phosphate is directly discharged into water without treatment, and the eutrophication process is accelerated, so that abnormal growth of aquatic organisms such as algae is caused, and the method has important significance for effectively removing and recycling phosphate in the water.
Currently, with respect to the field of phosphorus-containing wastewater treatment, a variety of treatment techniques have been developed, including: chemical coagulation, precipitation, biological treatment, ion exchange, adsorption, and the like. However, increasingly stringent phosphorus removal regulations present challenges to traditional phosphorus removal techniques. For example, chemical precipitation faces the problems of high dosage requirements of metal salts and significant increase in sludge formation rate; biodegradation faces the impact of system stability, such as organic loading, toxic substances and reactor operating parameters; physical processes such as electrodialysis face high energy consumption and low selectivity problems. Adsorption technology is generally considered to be an effective technology because it is relatively simple, relatively low cost, and does not produce sludge. However, the practical application of partial adsorbents in phosphate adsorption is limited by low selectivity removal rate, poor stability, difficult separation process, complex preparation method and the like.
Therefore, research on an adsorbent with high phosphate selectivity removal rate, good stability, simple separation process and simple preparation method is needed.
Disclosure of Invention
Aiming at the defects existing in the prior art, the invention aims to provide a gel ball adsorbent for selectively removing phosphorus, and a preparation method and application thereof. The preparation method is simple; the obtained adsorbent has good stability, can selectively and efficiently remove phosphate in water, is easy to separate from the water, and has simple separation process.
In order to achieve the above purpose, the technical scheme adopted by the invention is as follows:
a gel sphere adsorbent for selective dephosphorization, which is a surface-wrinkled, coarse spherical gel particle with a particle size of 1.8-2.4 mm.
According to the invention, the gel ball adsorbent is prepared from sodium alginate and nanometer yttrium oxide as main raw materials; in the spherical gel particles, the nanometer yttrium oxide is uniformly dispersed on the surface or inside the spherical gel particles.
The preparation method of the gel ball adsorbent for selective dephosphorization comprises the following steps:
(1) Nanometer yttrium oxide (Y) 2 O 3 ) Fully dispersing in water to obtain yttrium oxide dispersion liquid; adding Sodium Alginate (SA), and dissolving completely to obtain mixed solution;
(2) Dropwise adding the mixed solution into CaCl 2 In the aqueous solution, gel balls are formed, and then the gel balls are washed to obtain the gel ball adsorbent.
According to the invention, in the step (1), the mass concentration of the yttrium oxide dispersion liquid is preferably 1% -2%.
According to the invention, in the step (1), the mass ratio of the nanometer yttrium oxide to the sodium alginate is 0.25:1-1.5:1; preferably, the mass ratio of the nano yttrium oxide to the sodium alginate is 0.75:1-1:1. The proportion can ensure that the surface of the gel sphere is uniformly wrapped with nano yttrium oxide particles to the greatest extent, reduces the loss of effective adsorption sites of the adsorbent, and ensures that the adsorbent has excellent selective dephosphorization effect; and the prepared gel ball adsorbent can be ensured to have better mechanical strength. And provides enough viscosity to ensure that the nano yttrium oxide can be uniformly dispersed in the gel ball adsorbent by overcoming the action of gravity in the mixed solution. The addition ratio of SA is too low, so that the crosslinking degree is insufficient, the gel ball particles are difficult to form, and the addition ratio is too high, so that the crosslinking degree is too high, the effective adsorption sites of the adsorbent are reduced, and the final adsorption effect of the gel ball adsorbent is affected.
According to the present invention, in the step (1), the dissolution of sodium alginate is preferably performed under stirring at 40 to 50 ℃. Thus ensuring that SA is completely dissolved in water at 40-50 ℃.
According to a preferred embodiment of the invention, the steps of(2) CaCl in (C) 2 The mass concentration of the aqueous solution is 0.1-4%.
According to a preferred embodiment of the invention, in step (2), the mixture and CaCl 2 The volume ratio of the aqueous solution is 1:1-10.
According to the invention, in the step (2), the mixed solution is dropwise added by using a peristaltic pump; the flow rate is 1 to 5mL/min, preferably 2 to 3mL/min. The flow speed range can ensure that the nanometer yttrium oxide of the gel ball is uniformly coated on the gel ball. If the dropping flow rate is too slow, yttrium oxide is deposited on one side of the gel ball due to the gravity and other factors at the suction head of the hose outlet, so that the nano yttrium oxide is unevenly dispersed in the gel ball. If the dropping flow rate is too high, the mixed liquid can flow out in a strip shape, which is unfavorable for the formation of gel balls.
According to a preferred embodiment of the invention, in step (2), the mixture is added dropwise to CaCl 2 After the aqueous solution, stirring for 20-30h.
According to the present invention, in the step (2), washing is performed to remove excess Ca 2+ 。
The gel ball adsorbent for selectively removing phosphorus is applied to adsorb and remove phosphate in phosphorus-containing liquid as an adsorbent.
According to the invention, the pH of the phosphorus-containing liquid is preferably 2-7; preferably, the pH of the phosphorus-containing liquid is 2.
According to a preferred embodiment of the invention, the phosphate is potassium dihydrogen phosphate.
According to the invention, CO can also be added to the phosphorus-containing liquid 3 2- ，SO 4 2- Or Cl - So as to improve the adsorption effect of the gel ball adsorbent; in a phosphorus-containing liquid, the CO 3 2- The concentration of (2) is 0.01-0.1mol/L; in the phosphorus-containing liquid, SO 4 2- Or Cl-in a concentration of 0.001 to 0.1mol/L, preferably 0.01 to 0.1mol/L.
The invention has the technical characteristics and beneficial effects that:
(1) The invention combines the nanometer yttrium oxide and sodium alginate because of Y 2 O 3 The surface has a large number of hydroxyl groups, has good dispersibility and hydrophilicity, and enhances Y 2 O 3 Interfacial interactions with sodium alginate material such that Y 2 O 3 Has good compatibility with sodium alginate.
(2) The gel ball adsorbent prepared by the invention has obvious folds and roughness on the surface of the sphere, has larger specific surface area, is convenient to recover, does not cause pollution of nano particles, has good adsorption effect on phosphate, and can effectively adsorb the phosphate in water.
(3) The preparation method is simple; in the gel ball adsorbent prepared by the invention, Y 2 O 3 The adsorption performance can still keep a good effect, and the adsorption performance can cooperate with the combined action of sodium alginate, so that the obtained adsorbent has a good phosphate adsorption effect, has good ion selectivity on phosphate, and keeps stability in a wider pH range; compared with the single Y 2 O 3 Or calcium alginate gel spheres have more excellent adsorption effect.
(4) When the gel ball adsorbent is applied to the adsorption removal of phosphate in phosphorus-containing liquid, the gel ball adsorbent keeps stable adsorption performance under the condition of strong acidity (pH 2) and has stable adsorption effect in an acidic range. And at Cl - 、CO 3 2- Or SO 4 2- In the coexisting phosphorus-containing liquid, the above-mentioned ions exhibit a certain promoting effect on the adsorption effect of the adsorbent.
Drawings
Fig. 1 is an SEM image and an external view of the gel ball adsorbent prepared in example 1 of the present invention.
FIG. 2 is the adsorption amount data of the phosphate adsorption reaction of the gel ball adsorbents prepared in examples 1 to 7 and comparative example 1 according to the present invention.
FIG. 3 shows the effect of different pH conditions on the adsorption of phosphate on the gel ball adsorbent prepared in example 1 of the present invention.
FIG. 4 is the effect of the gel ball adsorbent prepared in example 1 of the present invention on the common anions in phosphate adsorption.
FIG. 5 is N of the gel ball adsorbent prepared in example 1 of the present invention 2 Adsorption/desorption isotherms and corresponding pore size distribution curves.
Detailed Description
The invention will be further illustrated with reference to specific examples. But is not limited thereto.
Meanwhile, the experimental methods described in the following examples are all conventional methods unless otherwise specified; the reagents, materials, and devices are commercially available unless otherwise specified.
Example 1
A method for preparing a gel ball adsorbent for selective dephosphorization, comprising the steps of:
(1) 2.0wt% CaCl was formulated 2 Aqueous solution: 2.0g of anhydrous calcium chloride is weighed and dissolved in 100mL of deionized water;
(2) Preparing a mixed solution 1: adding 1.5g of nano yttrium oxide into 100ml of deionized water, and stirring for 20-30 min in a constant-temperature heating magnetic stirrer to obtain a uniformly mixed solution 1;
(3) Preparing a mixed solution 2: weighing 2.0g of SA, adding into the uniformly stirred mixed solution 1, heating in a water bath at 40 ℃ and stirring for dissolution, and fully mixing to obtain a mixed solution 2;
(4) Preparation of gel ball adsorbent: pumping the prepared mixed solution 2 from one end of a hose through a peristaltic pump, and dropwise dripping the mixed solution into 2.0wt% CaCl prefabricated at the other end of the hose 2 In the aqueous solution, the flow rate was 2.5ml/min, and gel balls of uniform size were formed. Stirring and stabilizing for 24h in the crosslinking liquid, washing for multiple times with deionized water, filtering to obtain gel balls, absorbing excessive water on the surface with water absorbing paper to obtain gel ball adsorbent, and sealing and refrigerating in a refrigerator at low temperature for standby.
Fig. 1 is an SEM image and an external view of the gel ball adsorbent prepared in this example. From the figure, the rough folds and the granular feel of the gel ball surface are obvious, which can provide sites for phosphate to be more easily accessed and adsorbed. In addition, obvious pore channels can be observed in the cross section of the gel ball adsorbent, and the porous structure is favorable for swelling reaction, so that phosphate ions can diffuse into the gel ball material conveniently, a larger specific surface area is provided, and adsorption of phosphate anions is facilitated.
FIG. 5 shows the present embodimentExample N of the gel ball adsorbent prepared 2 Adsorption/desorption isotherms and corresponding pore size distribution curves. The specific surface of the yttrium oxide sodium alginate gel sphere adsorbent is 17.90m according to the analysis of a basic BET model 2 According to BJH model analysis, the pore volume and average pore diameter of the yttrium oxide sodium alginate gel sphere adsorbent are respectively 0.053cm 3 /g and 31.29nm.
Example 2
A method of preparing a gel sphere adsorbent for selective phosphorus removal as described in example 1, except that: change of addition Y in (2) 2 O 3 Is 0.5g; other steps and conditions were consistent with example 1.
Example 3
A method of preparing a gel sphere adsorbent for selective phosphorus removal as described in example 1, except that: change of addition Y in (2) 2 O 3 Is 1.0g; other steps and conditions were consistent with example 1.
Example 4
A method of preparing a gel sphere adsorbent for selective phosphorus removal as described in example 1, except that: change of addition Y in (2) 2 O 3 Is 2g; other steps and conditions were consistent with example 1.
Example 5
A method of preparing a gel sphere adsorbent for selective phosphorus removal as described in example 1, except that: change of addition Y in (2) 2 O 3 Is 2.4g; other steps and conditions were consistent with example 1.
Example 6
A method of preparing a gel sphere adsorbent for selective phosphorus removal as described in example 1, except that: change of addition Y in (2) 2 O 3 Is 2.5g; other steps and conditions were consistent with example 1.
Example 7
A method of preparing a gel sphere adsorbent for selective phosphorus removal as described in example 1, except that: change of addition Y in (2) 2 O 3 Is 3.0g; other steps and conditions were consistent with example 1.
Comparative example 1
A method of preparing a gel-sphere adsorbent, as described in example 1, with the difference that: change of addition Y in (2) 2 O 3 Is 0g; other steps and conditions were consistent with example 1.
Application example 1
Phosphate adsorption: the gel ball adsorbents prepared in examples 1 to 7 and comparative example 1 were placed in 50mL of an aqueous solution of potassium dihydrogen phosphate having an initial concentration of 50mg/L (dry weight: about 0.05 g), and the shaking reaction was performed at 25.+ -. 0.5 ℃ to ensure uniform mass transfer, and after 24 hours, samples were taken 1cm below the liquid surface, respectively. The sample was filtered through a 0.45 μm filter and the phosphorus content was determined using molybdenum-antimony anti-spectrophotometry.
FIG. 2 is the adsorption amount data of the reaction of the gel ball adsorbents prepared in examples 1 to 7 and comparative example 1 according to the present invention to adsorb phosphate, and it can be seen from FIG. 2 that example 1 has an optimal adsorption amount of 42.52mg/g to phosphate. Y in gel ball adsorbent 2 O 3 The addition amount is an important factor affecting the dephosphorization effect thereof. On the premise of a certain adding amount of gel balls, Y is arranged on the ball body 2 O 3 The content of the active site is increased, and the adsorption reaction is facilitated. When Y is 2 O 3 When the adding proportion is increased from 0:1 to 0.75:1, the adsorption amount of phosphate is greatly increased, and the adsorption amount is respectively increased from 0.92mg/g to 42.52mg/g and 1.3% to 80.0%; but with Y 2 O 3 The addition ratio is continuously increased from 0.75:1 to 1.5:1, and the effective adsorption sites are gradually saturated, so that the dephosphorization effect is not restricted any more, and the adsorption quantity is gradually reduced within the range. In practical application, the best Y is finally determined by comprehensively considering the adsorption quantity, the use cost and the like 2 O 3 SA ratio.
Application example 2
pH-influencing adsorption: 0.5g (dry weight about 0.05 g) of the gel ball adsorbent prepared in example 1 was placed in 50mL of aqueous potassium dihydrogen phosphate solution of different pH values with initial concentration of 50mg/L, and the shaking reaction was carried out at 25.+ -. 0.5 ℃ to ensure uniform mass transfer, and other test conditions were consistent with those of application example 1.
Fig. 3 shows the result of adsorbing phosphate under different pH conditions by using the gel ball adsorbent prepared in example 1, and the gel ball adsorbent prepared in example 1 is found to maintain a relatively stable adsorption performance under a strong acidic (pH 2) condition and to have a relatively stable adsorption effect in an acidic range by experimental result analysis. After the reaction, the final pH of the reaction solution system was maintained between 9 and 11.
Application example 3
The coexisting ions affect adsorption: 0.5g (dry weight about 0.05 g) of the gel ball adsorbent prepared in example 1 was placed in 50mL of a gel ball adsorbent containing CO 3 2- ，SO 4 2- And Cl - Potassium dihydrogen phosphate aqueous solution (wherein the concentration of phosphate is 50mg/L, CO) 3 2- At a concentration of 0.001mol/L or 0.01mol/L or 0.1mol/L SO 4 2- At a concentration of 0.001mol/L or 0.01mol/L or 0.1mol/L, cl - The concentration of (C) is 0.001mol/L or 0.01mol/L or 0.1 mol/L), the vibration reaction is carried out at 25+/-0.5 ℃ to ensure uniform mass transfer, and other test conditions are consistent with application example 1.
FIG. 4 is a comparison of the adsorption results of phosphate in the coexisting system of different anions for the gel ball adsorbent prepared in example 1, and the analysis of experimental results shows that SO is at a low concentration compared with a single system of phosphate only 4 2- In the system, the inhibition effect is not obvious, but is respectively shown in Cl - And CO 3 2- And high concentration of SO 4 2- The gel beads prepared in example 1 showed a certain acceleration effect on the coexisting system, and it can be demonstrated that the gel beads have good selectivity for phosphate. (blank refers to the adsorption effect obtained by a single phosphate system without the coexistence of other anions)
The foregoing description of the preferred embodiments of the invention is not intended to be limiting, but rather is intended to cover all modifications, equivalents, alternatives, and improvements that fall within the spirit and scope of the invention.

Claims (10)

1. A gel sphere adsorbent for selective dephosphorization, characterized in that the adsorbent is surface-wrinkled, coarse spherical gel particles with a particle size of 1.8-2.4 mm.
2. The gel ball adsorbent for selective dephosphorization according to claim 1, wherein the gel ball adsorbent is prepared from sodium alginate and nano yttrium oxide as main raw materials; in the spherical gel particles, the nanometer yttrium oxide is uniformly dispersed on the surface or inside the spherical gel particles.
3. The method for preparing a gel ball adsorbent for selective phosphorus removal according to any one of claims 1 or 2, comprising the steps of:
(1) Nanometer yttrium oxide (Y) 2 O 3 ) Fully dispersing in water to obtain yttrium oxide dispersion liquid; adding Sodium Alginate (SA), and dissolving completely to obtain mixed solution;
(2) Dropwise adding the mixed solution into CaCl 2 In the aqueous solution, gel balls are formed, and then the gel balls are washed to obtain the gel ball adsorbent.
4. The method for preparing a gel ball adsorbent for selective phosphorus removal according to claim 3, wherein in the step (1), any one of the following conditions is included:
i. the mass concentration of the yttrium oxide dispersion liquid is 1% -2%;
ii. The dissolution of sodium alginate is carried out under the stirring condition of 40-50 ℃.
5. The method for preparing a gel ball adsorbent for selective dephosphorization according to claim 3, wherein in the step (1), the mass ratio of nano yttrium oxide to sodium alginate is 0.25:1-1.5:1; preferably, the mass ratio of the nano yttrium oxide to the sodium alginate is 0.75:1-1:1.
6. The method for preparing a gel ball adsorbent for selective phosphorus removal according to claim 3, wherein in the step (2), any one of the following conditions is included:
i、CaCl 2 the mass concentration of the aqueous solution is 0.1% -4%;
ii. Mixed liquor and CaCl 2 The volume ratio of the aqueous solution is 1:1-10;
iii, drop-wise adding the mixed solution to CaCl 2 After the aqueous solution, stirring for 20-30h.
7. The method for preparing a gel ball adsorbent for selective phosphorus removal according to claim 3, wherein in the step (2), the mixture is dropwise added using a peristaltic pump; the flow rate is 1 to 5mL/min, preferably 2 to 3mL/min.
8. Use of a gel ball adsorbent for selective phosphorus removal according to any one of claims 1 or 2 as an adsorbent for the adsorptive removal of phosphate from phosphorus-containing liquids.
9. The use of a gel ball adsorbent for selective phosphorus removal according to claim 8, wherein the pH of the phosphorus-containing liquid is 2-7; preferably, the pH of the phosphorus-containing liquid is 2; preferably, the phosphate is potassium dihydrogen phosphate.
10. The use of a gel ball adsorbent for selective phosphorus removal as defined in claim 8 wherein CO may also be added to the phosphorus-containing liquid 3 2- ，SO 4 2- Or Cl - So as to improve the adsorption effect of the gel ball adsorbent; in a phosphorus-containing liquid, the CO 3 2- The concentration of (2) is 0.01-0.1mol/L; in the phosphorus-containing liquid, SO 4 2- Or Cl-in a concentration of 0.001 to 0.1mol/L, preferably 0.01 to 0.1mol/L.
CN202310269336.7A 2023-03-20 2023-03-20 Gel ball adsorbent for selective dephosphorization and preparation method and application thereof Pending CN116037073A (en)

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Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2001340756A (en) * 2000-03-27 2001-12-11 Natl Inst Of Advanced Industrial Science & Technology Meti Particles for adsorbing harmful anions and method of producing the same
US20140260468A1 (en) * 2013-03-15 2014-09-18 Ndsu Research Foundation Iron-Functionalized Alginate for Phosphate and Other Contaminant Removal and Recovery from Aqueous Solutions

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2001340756A (en) * 2000-03-27 2001-12-11 Natl Inst Of Advanced Industrial Science & Technology Meti Particles for adsorbing harmful anions and method of producing the same
US20140260468A1 (en) * 2013-03-15 2014-09-18 Ndsu Research Foundation Iron-Functionalized Alginate for Phosphate and Other Contaminant Removal and Recovery from Aqueous Solutions

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
XIANG JI ET AL: "Fabrication of lanthanum-based phosphate binder using cross-linked alginate as a carrier", RSC ADV, 9 June 2015 (2015-06-09), pages 2 *
孔祥武等: "氧化钇对磷酸根的吸附及机理研究", 应用化工, vol. 43, no. 12, 31 December 2014 (2014-12-31), pages 2 *

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