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Glass powder enhanced Zr modification montmorillonite honeycomb block chromium sorbent and preparation method thereof

A montmorillonite and glass powder technology, applied in chemical instruments and methods, adsorption water/sewage treatment, other chemical processes, etc., can solve the problems of powder loss, difficult separation, no porous structure, etc., and achieve easy separation and adsorption. Good effect, good for adsorption

Active Publication Date: 2015-07-22
SHAANXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Using zirconium salts to modify sodium-based nano-montmorillonite can increase the adsorption capacity of montmorillonite to chromium, but the prepared Zr-MMT is mostly powder, which is easy to be lost with the effluent in actual wastewater treatment, and separation is difficult. Min et al. (200910091394.5) also studied that the adsorbent powder for removing arsenic and fluorine was made into granules through the esterification reaction of polyvinyl alcohol and carboxylic acid, which improved the strength of the adsorbent, but none of them had a porous structure.

Method used

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  • Glass powder enhanced Zr modification montmorillonite honeycomb block chromium sorbent and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] 1) Take a montmorillonite suspension that is uniformly dispersed and has a mass concentration of 10%.

[0043] 2) Stir at high speed at 40°C, add the zirconium sulfate solution dropwise to the montmorillonite suspension, the mass ratio of zirconium sulfate to montmorillonite is 1:5, continue stirring for 1 hour after the addition, and use 1mol / L The pH value of the sodium hydroxide solution was adjusted to 3, soaked for 7 hours, centrifuged, and the centrifuged filter cake was taken out and placed in a beaker.

[0044] 3) Dry the filter cake at 80°C, grind it through a 200-mesh sieve after drying, and roast at 400°C for 3 hours to obtain Zr-MMT powder.

[0045] 4) Dissolve 12.5g of monomer acrylamide (AM) and 1.25g of cross-linking agent N,N'-methylenebisacrylamide (MBAM) in 15mL of water, add 1.25mL of dispersant polyacrylate ammonium salt after dissolving, Stir evenly to obtain a mixed solution, at this time A:R:S:T=12.5:1.25:1.25:15.

[0046] 5) Slowly add 5 g of t...

Embodiment 2

[0054] 1) Take a montmorillonite suspension that is uniformly dispersed and has a mass concentration of 10%.

[0055] 2) Stir at high speed at 60°C, drop the zirconium sulfate solution into the montmorillonite suspension, the mass ratio of zirconium sulfate to montmorillonite is 2:5, continue to stir for 1h after the dropwise addition, and use 1mol / L The pH value of the sodium hydroxide solution was adjusted to 7, centrifuged after 8 hours of immersion, and the centrifuged filter cake was taken out and placed in a beaker.

[0056] 3) Dry the filter cake at 80°C, grind it through a 200-mesh sieve after drying, and roast at 500°C for 3 hours to obtain Zr-MMT powder.

[0057] 4) Dissolve 11.5g of monomer acrylamide (AM) and 1.35g of cross-linking agent N,N'-methylenebisacrylamide (MBAM) in 15mL of water, add 1.35mL of dispersant polyacrylate ammonium salt after dissolving, Stir evenly to obtain a mixed solution, at this time A:R:S:T=11.5:1.35:1.35:15.

[0058] 5) Slowly add 3 g...

Embodiment 3

[0065] 1) Take a montmorillonite suspension that is uniformly dispersed and has a mass concentration of 10%.

[0066] 2) Stir at high speed at 80°C, drop the zirconium sulfate solution into the montmorillonite suspension, the mass ratio of zirconium sulfate to montmorillonite is 1.2:5, continue to stir for 1h after the dropwise addition, and use 1mol / L The sodium hydroxide solution adjusted the pH value to 2, centrifuged after soaking for 6 hours, and took out the centrifuged filter cake and placed it in a beaker.

[0067] 3) Dry the filter cake at 80°C, grind it through a 200-mesh sieve after drying, and roast at 500°C for 3 hours to obtain Zr-MMT powder.

[0068] 4) Dissolve 13.5g of monomer acrylamide (AM) and 1.15g of cross-linking agent N,N'-methylenebisacrylamide (MBAM) in 15mL of water, add 1.25mL of dispersant ammonium citrate after dissolving, and stir Evenly, a mixed solution is obtained, at this time A:R:S:T=13.5:1.15:1.25:15.

[0069] 5) Slowly add 4 g of the Zr-...

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Abstract

The invention relates to a glass powder enhanced Zr modification montmorillonite honeycomb block chromium sorbent and a preparation method thereof. The preparation method comprises the following steps: dissolving a monomer, a cross-linking agent and a dispersant, which are used for gel polymerization, in water to form a mixed solution; adding Zr modification montmorillonite powder, polystyrene spheres with particle diameters of 1-1.5 mm and glass powder into the mixed solution, and carrying out uniform mixing to obtain a slurry; adding a foaming agent, an initiating agent and a catalyst which are used for gel polymerization, carrying out uniform mixing for a polymerization reaction, and obtain a dry blank after the polymerization reaction is completed; conducting heat preservation on the dry blank at 330-440 DEG C and 550-700 DEG C respectively, and then obtain the glass powder enhanced Zr modification montmorillonite honeycomb block chromium sorbent. Through the polymerization reaction, the Zr modification montmorillonite powder, the polystyrene spheres and the glass powder are uniformly embedded in a polymer chain to form a regular block porous material which is high in water permeability; when being utilized for treating low-concentration chromium-containing wastewater, the formed regular block porous material has the advantages that the adsorption effect is good, and the Zr modification montmorillonite powder is effectively prevented from being lost along with wastewater discharge.

Description

technical field [0001] The invention relates to the field of waste water treatment, in particular to a glass powder reinforced Zr modified montmorillonite honeycomb block chromium adsorbent and a preparation method thereof. Background technique [0002] Montmorillonite (MMT) has a large specific surface area and cation exchange capacity, and has become the focus of current research on adsorbent materials. As a highly efficient natural adsorbent, the adsorption of montmorillonite is mainly ion exchange and surface complex adsorption. Montmorillonite is a layered hydroaluminosilicate mineral of 2:1 or TOT type, generally white or Pale yellow. The structural unit layer is a layer of Al-O sandwiched between two Si-O tetrahedrons (T layer) with top corners facing inward. 4 (OH) 2 Octahedral sheet (O layer). Due to the isomorphic substitution between the montmorillonite lattice, some aluminum atoms in the alumina octahedron are easily replaced by low-valent atoms, such as Mg ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/26B01J20/30C02F1/28C02F1/62
Inventor 马宏瑞郭颖艳于成龙
Owner SHAANXI UNIV OF SCI & TECH
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