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Preparation of Amino-modified Attapulgite Adsorbent and Method for Removing Hexavalent Chromium from Water

A technology of modified attapulgite and attapulgite, which is applied in the field of preparation of amino-modified attapulgite adsorbent to remove hexavalent chromium in water and amino-modified attapulgite adsorbent, which can solve the problem of high processing cost, Recycling complex, expensive and other issues, to achieve the effect of good adsorption performance, low cost, simple operation

Inactive Publication Date: 2016-09-14
安徽鑫山新材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Activated carbon is commonly used as an adsorbent in China to remove hexavalent chromium in water. Its regeneration and utilization are relatively complicated, expensive, and high in treatment costs.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0024] The preparation method of the amino-modified attapulgite adsorbent of the present invention is specifically implemented according to the following steps:

[0025] Step 1, pretreatment of attapulgite

[0026] Add attapulgite to distilled water, mix and ultrasonically disperse for 10-30 minutes, filter to remove large particles at the bottom, centrifuge (3500r / min), dry (80°C), grind, and roast (500°C); the roasted attapulgite The soil is ultrasonically dispersed in a hydrochloric acid solution with a concentration of 1-5mol / L, reacted at 80°C-90°C for 8-9h, then filtered, washed until neutral, dried, and set aside;

[0027] Among them, the mass-volume ratio of attapulgite to distilled water is 1:10-20g / mL, and the mass-volume ratio of roasted attapulgite to hydrochloric acid solution is 1:10-20g / mL;

[0028] Step 2: Add the silane coupling agent and the amine-based reagent to methanol, react at 80-90°C for 8-24 hours under the protection of nitrogen, then filter, and co...

Embodiment 1

[0037] Step 1, pretreatment of attapulgite

[0038] Add 10g of attapulgite ATP to 200mL of distilled water, mix and ultrasonically disperse for 30 minutes, filter to remove large particles at the bottom, centrifuge (3500r / min), dry (80°C), grind, and roast (500°C); Place 5 g of stick clay in 100 mL of hydrochloric acid solution with a concentration of 1 mol / L for ultrasonic dispersion, react at 80°C for 8 hours, filter, wash until neutral, dry, and set aside;

[0039] Step 2, add 5mL of γ-(2,3-glycidyloxypropoxy)propyltrimethoxysilane and 1.5mL of ethylenediamine EDA into 100mL of methanol, react at 80°C for 24h under the protection of nitrogen, and then filter the obtained Concentrate the volume of solution A to 40mL for later use;

[0040] Step 3, add the attapulgite pretreated in step 1 into toluene for ultrasonic dispersion for 10min, then add the solution A obtained in step 2 (the mass volume ratio of the pretreated attapulgite, toluene, and solution A is 1:20:8g / mL), ...

Embodiment 2

[0042] Step 1, pretreatment of attapulgite

[0043]Add 10g of attapulgite ATP to 200mL of distilled water, mix and ultrasonically disperse for 30 minutes, filter to remove large particles at the bottom, centrifuge (3500r / min), dry (80°C), grind, and roast (500°C); Place 5 g of stick clay in 100 mL of hydrochloric acid solution with a concentration of 1 mol / L for ultrasonic dispersion, react at 80°C for 8 hours, filter, wash until neutral, dry, and set aside;

[0044] Step 2, add 5mL of γ-(2,3-glycidyloxypropoxy)propyltrimethoxysilane and 3.4mL of triethylenetetramine TETA into 100mL of methanol, react at 80°C for 24h under the protection of nitrogen, and then filter to obtain Concentrate the volume of solution A to 40mL for later use;

[0045] Step 3, add the attapulgite pretreated in step 1 into toluene for ultrasonic dispersion for 10min, then add the solution A obtained in step 2 (the mass volume ratio of the pretreated attapulgite, toluene, and solution A is 1:20:8g / mL)...

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Abstract

The preparation method of the amino-modified attapulgite adsorbent comprises reacting an amino reagent with a silane coupling agent to obtain a solution A; using the solution A to carry out grafting reaction on the surface of the pretreated attapulgite to obtain the attapulgite adsorbent. The invention also discloses a method for removing hexavalent chromium in water by using an amino-modified attapulgite adsorbent, adding an amino-modified attapulgite adsorbent 0.0005 times its mass into the water body to be purified, and at 25°C and pH Adsorb hexavalent chromium in water under the condition of 3.0-9.9, collect the amino-modified attapulgite adsorbent after adsorption for 10min-24h, and purify hexavalent chromium in water. The invention modifies the attapulgite with an amine-based reagent to synthesize the attapulgite adsorbent with high amino content; the modified attapulgite has stable chemical properties and is not affected by external environmental factors, and the method of the invention is simple to operate , low cost, good adsorption performance.

Description

technical field [0001] The invention belongs to the technical field of water pollution control, and in particular relates to a method for preparing an amino-modified attapulgite adsorbent, and also relates to a method for removing hexavalent chromium in water by using the amino-modified attapulgite adsorbent prepared above . Background technique [0002] The massive discharge of chromium-containing wastewater leads to excessive levels of hexavalent chromium in the water, seriously endangering the safety of human beings and natural ecosystems. Chromium mainly exists in the form of trivalent chromium and hexavalent chromium in water bodies. Compared with trivalent chromium, hexavalent chromium is more toxic and will accumulate and enrich in organisms and human bodies for a long time. It is a heavy environmental pollution substance , hexavalent chromium has a high migration ability. The existence of hexavalent chromium in water not only has a great impact on the growth of plan...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J20/22B01J20/30C02F1/28C02F1/62
Inventor 王家宏刘少冲汤伟
Owner 安徽鑫山新材料科技有限公司
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