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Modified bentonite, application thereof, modified bentonite granule, and heavy metal adsorbent

A bentonite and modified technology, which is applied in the field of deep processing of bentonite and heavy metal pollution control, can solve the problems of poor adsorption performance of heavy metals, and achieve the effects of fast adsorption rate, excellent heavy metal adsorption performance and wide application range

Inactive Publication Date: 2019-06-25
NANYANG NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

To solve the problem of poor adsorption performance of bentonite heavy metals in the prior art

Method used

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  • Modified bentonite, application thereof, modified bentonite granule, and heavy metal adsorbent
  • Modified bentonite, application thereof, modified bentonite granule, and heavy metal adsorbent
  • Modified bentonite, application thereof, modified bentonite granule, and heavy metal adsorbent

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Example 1: Preparation of modified bentonite by reaction of melamine and bentonite under different acidic medium conditions

[0034] The specific operation steps are as follows:

[0035] a, dilute concentrated hydrochloric acid, glacial acetic acid, concentrated nitric acid or concentrated sulfuric acid with distilled water respectively, be mixed with the solution that volume percent concentration is 2%, boric acid is dissolved with distilled water, be mixed with the solution that the mass fraction concentration is 5%.

[0036] b. Dissolve 1.9281g of melamine in 300mL of the solution obtained in step a;

[0037] c, add 10.00g bentonite to the solution obtained in step b (cation exchange capacity is 1.0179mmol / g);

[0038] d. Fully heating and stirring the mixture obtained in step c at 80°C for 8 hours;

[0039] e, the reaction mixture obtained in step d is suction filtered while hot, and the filter cake is washed 3 times with hot water;

[0040] f, the filter cake ob...

Embodiment 2

[0043] Embodiment two: prepare modified bentonite with melamine salt compound and bentonite reaction in aqueous solution

[0044] The specific operation steps are as follows:

[0045] a, 10.00g (cation exchange capacity is 1.0179mmol / g) bentonite is mixed with 400mL water to prepare slurry;

[0046] B, fully stirring and dispersing the bentonite slurry obtained in step a;

[0047] c. Add 0.015mol melamine phosphate (purity ≥ 99%, Nanjing Senbega Biotechnology Co., Ltd.), 0.015mol melamine hydrochloride (purity ≥ 99%, Hubei Giant) respectively to the uniformly dispersed bentonite slurry obtained in step b. Sheng Technology Co., Ltd.), 0.015mol melamine borate (purity ≥99%, Taian Jiaye Biotechnology Co., Ltd.) and 0.015mol melamine sulfate (purity ≥97%, Nanjing Kangmanlin Chemical Industry Co., Ltd.);

[0048] d. Fully heating and stirring the mixture obtained in step c at 70°C for 8 hours;

[0049] e, the reaction mixture obtained in step d is suction filtered while hot, and...

Embodiment 3

[0052] Example 3: Prepare modified bentonite by reacting different amounts of melamine phosphate and bentonite in aqueous solution

[0053] The specific operation steps are as follows:

[0054] a, 10.00g (cation exchange capacity is 1.0179mmol / g) bentonite is mixed with 400mL water to prepare slurry;

[0055] B, fully stirring and dispersing the bentonite slurry obtained in step a;

[0056] c. Add 0.005mol, 0.010mol, 0.015mol, 0.020mol melamine phosphate (purity ≥ 99%, Nanjing Senbega Biotechnology Co., Ltd.) to the uniformly dispersed bentonite slurry obtained in step b respectively;

[0057] d. Fully heating and stirring the mixture obtained in step c at 80°C for 8 hours;

[0058] e, the reaction mixture obtained in step d is suction filtered while hot, and the filter cake is washed 3 times with hot water;

[0059] f, the filter cake obtained in step e is transferred to a drying oven for drying;

[0060] g. Grinding and sieving the dried sample obtained in step f to obta...

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Abstract

The invention relates to the technical field of bentonite deep processing and heavy metal pollution control, in particular to modified bentonite and application thereof, modified bentonite particles and a heavy metal adsorbent. The modified bentonite is prepared by modifying bentonite by using melamine or a melamine salt compound as a modifier. The removal efficiency of the modified bentonite on Hg<2+> ions can reach 99.63%, and the modified bentonite can be used for adsorbing heavy metals such as Hg<2+>, Pb<2+>, Cu<2+>, Cd<2+>, Ni<2+> and Zn<2+> in water and soil.

Description

technical field [0001] The invention relates to the technical field of bentonite deep processing and heavy metal pollution control, in particular to a modified bentonite and its application, modified bentonite particles and a heavy metal adsorbent. Background technique [0002] Bentonite is a non-metallic clay mineral mainly composed of montmorillonite minerals. Montmorillonite is a hydrous aluminosilicate mineral with a 2:1 planar layered structure, and the crystal layers are filled with exchangeable cations such as Na + , Ca 2+ Ions, free water molecules and some soluble substances. This special structure makes it have strong water absorption, swelling, adsorption, adhesion and cation exchange properties. The exchangeable cations between bentonite crystal layers can interact with heavy metal ions such as Pb 2+ 、Cd 2+ 、Cu 2+ , Hg 2+ Ions and the like undergo substitution reactions to adsorb heavy metal ions. Many research results show that bentonite has good adsorpt...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/22C02F1/28B01J20/30C02F101/20
Inventor 王晓焕张志峰
Owner NANYANG NORMAL UNIV
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