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Method for adsorbing and removing arsenic by using iron-manganese oxide/mesoporous silica adsorbent

A technology of mesoporous silicon oxide and iron-manganese oxide, which is applied in the fields of alkali metal oxides/hydroxides, chemical instruments and methods, and silicon compounds, and can solve the problems of limited arsenic removal rate and unsuitability for large-scale applications. Achieve the effects of increasing porosity, simple preparation, and increasing adsorption capacity

Inactive Publication Date: 2020-08-25
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The above methods have very limited arsenic removal rates, and some methods are only suitable for adsorbing a small amount of arsenic in water, and are not suitable for large-scale applications.

Method used

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  • Method for adsorbing and removing arsenic by using iron-manganese oxide/mesoporous silica adsorbent

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Example 1: The pollution acid in this example comes from the pollution acid containing a large amount of impurities such as arsenic after washing the smelting flue gas in the sulfuric acid workshop of a zinc smelter in the southwest region. The main components are shown in Table 1;

[0023] Table 1 Contaminated acid composition

[0024]

[0025] A method for removing arsenic by iron-manganese oxide / mesoporous silica adsorbent, the specific steps are as follows:

[0026] (1) Add mesoporous silica to deionized water, and ultrasonically disperse for 0.5h to obtain a mesoporous silica suspension; wherein the solid-to-liquid ratio of mesoporous silica to deionized water (mg:mL) is 1:1.1;

[0027] (2) Adjust the pH value of the mesoporous silica suspension in step (1) to 7;

[0028] (3) Add KMnO to the mesoporous silica suspension in step (2) 4 And FeSO 4 ·7H 2 O, mix uniformly to obtain mixture A, place mixture A at a temperature of 65°C and react for 3 hours, then cool to room temper...

Embodiment 2

[0039] Example 2: The pollution acid in this example comes from the pollution acid containing a large amount of impurities such as arsenic, which is produced after washing the smelting flue gas in the sulfuric acid workshop of a zinc smelter in the southwestern region. The main components are shown in Table 4;

[0040] Table 4 Contaminated acid composition

[0041]

[0042] A method for adsorbing and removing arsenic by iron-manganese oxide / mesoporous silica adsorbent, the specific steps are as follows:

[0043] (1) Add mesoporous silica to deionized water, and ultrasonically disperse for 1.0 h to obtain a mesoporous silica suspension; wherein the solid-to-liquid ratio of mesoporous silica to deionized water (mg:mL) is 1:0.9;

[0044] (2) Adjust the pH value of the mesoporous silica suspension in step (1) to 8;

[0045] (3) Add KMnO to the mesoporous silica suspension in step (2) 4 And FeSO 4 ·7H 2 O, mix evenly to obtain mixture A, place mixture A at a temperature of 55℃ to react for 2...

Embodiment 3

[0056] Example 3: The pollution acid in this example comes from the pollution acid containing a large amount of impurities such as arsenic, which is produced after washing the smelting flue gas in the sulfuric acid workshop of a zinc smelter in the southwestern region. The main components are shown in Table 7;

[0057] Table 7 Contaminated acid composition

[0058]

[0059] A method for adsorbing and removing arsenic by iron-manganese oxide / mesoporous silica adsorbent, the specific steps are as follows:

[0060] (1) Add mesoporous silica to deionized water, and ultrasonically disperse for 0.75h to obtain a mesoporous silica suspension; wherein the solid-to-liquid ratio of mesoporous silica to deionized water (mg:mL) is 1:1.0;

[0061] (2) Adjust the pH value of the mesoporous silica suspension in step (1) to 7.5;

[0062] (3) Add KMnO to the mesoporous silica suspension in step (2) 4 And FeSO 4 ·7H 2 O, mix evenly to obtain mixture A, place mixture A at a temperature of 60°C for 2.5 hou...

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Abstract

The invention relates to a method for adsorbing and removing arsenic by using an iron-manganese oxide / mesoporous silica adsorbent, and belongs to the technical field of heavy metal pollution treatment. The iron-manganese oxide / mesoporous silica adsorbent is prepared by taking mesoporous silica as a carrier and loading the iron-manganese oxide, the agglomeration effect of the iron-manganese oxide is reduced by adding the mesoporous silica, and the porosity and the corresponding arsenic removal efficiency of the adsorbent can be improved by taking the silica as the carrier and loading the iron-manganese oxide. The preparation method of the adsorbent is simple, the adsorption amount for an arsenic solution is large, the adsorption rate is high, and the adsorbent has a wide application prospect.

Description

Technical field [0001] The invention relates to a method for adsorbing and removing arsenic by an iron-manganese oxide / mesoporous silicon oxide adsorbent, which belongs to the technical field of heavy metal pollution treatment. Background technique [0002] Arsenic and arsenic compounds are toxic and potentially dangerous to humans, animals and plants. Arsenic can form highly toxic compounds, which can be absorbed by the human body from the respiratory tract, skin and digestive tract, causing neurasthenia syndrome; at the same time, through weathering, Arsenic can also be released from minerals and enter groundwater and soil, thus affecting our country’s water resources. Secondly, China’s steel production is very large, and a large amount of arsenic-containing wastewater is produced during the production of steel. Therefore, the treatment of these arsenic-containing wastewater is of great importance in the treatment of water pollution Its important meaning. [0003] In the wastewa...

Claims

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Application Information

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IPC IPC(8): B01J20/10B01J20/28B01J20/30C02F1/28C02F101/10C02F103/16
CPCB01J20/103B01J20/28083C02F1/281C02F2101/103C02F2103/16
Inventor 祁先进李雪竹李国华祝星王华段孝旭杨妮娜卢治旭
Owner KUNMING UNIV OF SCI & TECH
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