Method I for preparing amino-modified attapulgite adsorbent and method II for removing hexavalent chromium from water

A technology for modifying attapulgite and attapulgite, which is applied in the preparation of amine-based modified attapulgite adsorbent, and the field of amine-based modified attapulgite adsorbent for removing hexavalent chromium in water, which can solve the problem of complex regeneration and utilization, High cost and high processing cost, to achieve the effect of low cost, good adsorption performance and stable chemical properties

Inactive Publication Date: 2014-12-24
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.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[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 soil

[0026] Add the attapulgite soil into distilled water, mix and ultrasonically disperse for 10-30 minutes, filter to remove large particles at the bottom, centrifuge (3500r / min), dry (80℃), grind, and roast (500℃); take the roasted attapulgite The soil is placed in a hydrochloric acid solution with a concentration of 1 to 5 mol / L for ultrasonic dispersion, reacted at 80°C to 90°C for 8 to 9 hours, then filtered, washed to neutrality, 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...

Example Embodiment

[0036] Example 1

[0037] Step 1. Pretreatment of attapulgite soil

[0038] Add 10g of attapulgite ATP to 200mL of distilled water, mix and ultrasonically disperse for 30min, filter to remove large particles at the bottom, centrifuge (3500r / min), dry (80℃), grind, and roast (500℃); remove the roasted bumps Put 5 g of coryneform soil in 100 mL of hydrochloric acid solution with a concentration of 1 mol / L for ultrasonic dispersion, react at 80°C for 8 hours, then filter, wash to neutrality, and dry for later use;

[0039] Step 2. Add 5mL of γ-(2,3-glycidoxy)propyltrimethoxysilane and 1.5mL of ethylenediamine EDA to 100mL of methanol, react at 80°C for 24h under the protection of nitrogen, and filter. The volume of solution A is concentrated to 40mL, ready for use;

[0040] Step 3. Add the pretreated attapulgite in step 1 into toluene for ultrasonic dispersion for 10 minutes, and then add the solution A obtained in step 2 (the mass-volume ratio of the pretreated attapulgite, toluene, an...

Example Embodiment

[0041] Example 2

[0042] Step 1. Pretreatment of attapulgite soil

[0043] Add 10g of attapulgite ATP to 200mL of distilled water, mix and ultrasonically disperse for 30min, filter to remove large particles at the bottom, centrifuge (3500r / min), dry (80℃), grind, and roast (500℃); remove the roasted bumps Put 5 g of coryneform soil in 100 mL of hydrochloric acid solution with a concentration of 1 mol / L for ultrasonic dispersion, react at 80°C for 8 hours, then filter, wash to neutrality, and dry for later use;

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

[0045] Step 3. Add the pretreated attapulgite in step 1 into toluene for ultrasonic dispersion for 10 minutes, and then add the solution A obtained in step 2 (the mass-volume ratio of the pretreated attapulgite, toluene, and solu...

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Abstract

The invention relates to a method I for preparing an amino-modified attapulgite adsorbent. The method I comprises the following steps: performing the reaction on an amino reagent and a silane coupling agent to obtain solution A; performing the grafting reaction on the surface of preprocessed attapulgite by utilizing the solution A so as to obtain the amino-modified attapulgite adsorbent. The invention further discloses a method II for removing hexavalent chromium from water by utilizing the amino-modified attapulgite adsorbent. The method II comprises the following steps: adding the amino-modified attapulgite adsorbent of which mass is 0.0005 time of a water body to be purified into the water body to be purified; adsorbing hexavalent chromium in the water under the conditions of a temperature of 25 DEG C and pH of 3.0 to 9.9; after adsorbing for 10min to 24h, collecting the amino-modified attapulgite adsorbent and purifying hexavalent chromium in the water body. According to the invention, the amino reagent is adopted to modify the attapulgite so as to synthesize the attapulgite adsorbent with high amino content; the modified attapulgite has stable chemical performance and is not influenced by the outside environmental factors. The method disclosed by the invention is simple to operate, low in cost and high in adsorption property.

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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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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