Modified resin for removing arsenic from low-concentration arsenic-containing water and preparation method thereof

A modified resin and low-concentration technology, applied in chemical instruments and methods, other chemical processes, water/sewage treatment, etc., can solve problems such as complex multi-stage treatment processes, limited popularization and application, high operating costs, etc., and achieve high efficiency , a wide range of applications, flexible use of the effect

Inactive Publication Date: 2015-06-03
SUN YAT SEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The existing arsenic removal methods mainly include adsorption method, precipitation method, ion exchange method, reverse osmosis, electrocoagulation method, etc. Their disadvantages include high operating cost, complicated process, low efficiency and long time consumption.
The coagulation-sedimentation method generally requires a large amount of coagulant, etc., and it is difficult to reduce the concentration of arsenic to the safe concentration range. At the same time, a large amount of sludge is generated, and its improper disposal may cause secondary pollution to the environment.
Relatively speaking, although the use of special membrane filtration equipment can meet drinking water standards, its popularization and application is greatly limited due to the complex multi-stage treatment process and high operating costs.

Method used

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  • Modified resin for removing arsenic from low-concentration arsenic-containing water and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] The preparation of embodiment 1 modified resin

[0029] 1. The preparation method comprises the following steps:

[0030] S1. Dry the resin at 60°C for 10 hours;

[0031] S2. According to the mass ratio of aluminum salt to 13% of the resin, add the dried resin of S1 to the freshly prepared 0.5M AlCl 3 ·6H 2 O solution, stirred at room temperature under vacuum at 600r / min for 1h;

[0032] S3. After vacuum stirring in step S2, stir in the air at 600r / min for 1h, so that aluminum trichloride is fully adsorbed and wrapped on the surface and pores of the resin, and completely hydrolyzed to form nano-aluminum hydroxide, filtered, washed 3 times with water, and placed at 60°C Dried to obtain aluminum-loaded resin;

[0033] S4. According to the mass ratio of iron salt to 13% of the resin, under the protection of nitrogen, add the aluminum-loaded resin of S3 to the freshly prepared 0.5M FeCl 3 ·6H 2 O solution, stirred at 600r / min for 2h at room temperature;

[0034] S5....

Embodiment 2

[0035] The preparation of embodiment 2 modified resins

[0036] 1. The preparation method comprises the following steps:

[0037] S1. Dry the resin at 60°C for 10 hours;

[0038] S2. According to the mass ratio of aluminum salt to 15% of the resin, add the dried resin of S1 to the freshly prepared 0.5M AlCl 3 ·6H 2 O solution, stirred at room temperature under vacuum at 600r / min for 1h;

[0039] S3. After vacuum stirring in step S2, stir in the air at 600r / min for 1h, so that aluminum trichloride is fully adsorbed and wrapped on the surface and pores of the resin, and completely hydrolyzed to form nano-aluminum hydroxide, filtered, washed 3 times with water, and placed at 60°C Dried to obtain aluminum-loaded resin;

[0040] S4. According to the mass ratio of iron salt to 10% of the resin, under the protection of nitrogen, add the aluminum-loaded resin of S3 to the freshly prepared 0.5M FeCl 3 ·6H 2 O solution, stirred at 600r / min for 2h at room temperature;

[0041] S...

Embodiment 3

[0042] The preparation of embodiment 3 modified resins

[0043] 1. The preparation method comprises the following steps:

[0044] S1. Dry the resin at 60°C for 10 hours;

[0045] S2. According to the mass ratio of aluminum salt to 10% of the resin, add the dried resin of S1 to the freshly prepared 0.5M AlCl 3 ·6H 2 O solution, stirred at room temperature under vacuum at 600r / min for 1h;

[0046] S3. After vacuum stirring in step S2, stir in the air at 600r / min for 1h, so that aluminum trichloride is fully adsorbed and wrapped on the surface and pores of the resin, and completely hydrolyzed to form nano-aluminum hydroxide, filtered, washed 3 times with water, and placed at 60°C Dried to obtain aluminum-loaded resin;

[0047] S4. According to the mass ratio of iron salt to 15% of the resin, under the protection of nitrogen, add the aluminum-loaded resin of S3 to the freshly prepared 0.5M FeCl 3 ·6H 2 O solution, stirred at 600r / min for 2h at room temperature;

[0048] S5....

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Abstract

The invention discloses modified resin for removing arsenic from low-concentration arsenic-containing water and a preparation method of the modified resin. The modified resin is prepared as follows: resin is impregnated in aluminum chloride solution to be loaded sufficiently, and then is impregnated in ferric chloride solution to be loaded sufficiently, therefore, the modified resin is acquired; the modified rein is loaded with iron and aluminum materials with high arsenic adsorption capacity, and has greatly-improved arsenic removal ability due to the synergic effect of the iron and aluminum materials, and the arsenic removal rate can reach more than 99%, and the concentration of arsenic in water after adsorption treatment of modified resin can reach 0.001mg/L and is lower than the national newest drinking water standard 0.01mg/L. The modified resin is also suitable for treating sewage with low arsenic concentration, and the concentration of arsenic in yielding water is lower than 50ppb. The modified resin material is solid particles which can be separated, can be filled in a filter and has flexible using modes, the modified resin material can be used for static adsorption and can be used as a packed column for dynamic adsorption, has stable adsorption capability and long using period, can be regenerated and repeatedly utilized easily, and has high efficiency.

Description

technical field [0001] The invention belongs to the technical field of arsenic-containing water treatment. More specifically, it relates to a modified resin for removing arsenic from low-concentration arsenic-containing water and a preparation method thereof. Background technique [0002] Arsenic exists widely in natural rocks and soils. With the development of industry, a large amount of toxic arsenic is continuously released and migrated to water bodies and soil environments. As a result, the arsenic content in water bodies in some areas of my country, such as Hunan, Yunnan, and Inner Mongolia, has far exceeded the standard, and endemic arsenic has occurred. poisoning incident. Due to the accumulation effect of arsenic in the human body, long-term excessive intake of arsenic will cause serious harm such as canceration of the human liver, nerves, blood, and skin. In 1993, the World Health Organization lowered the safe limit of arsenic content in drinking water to 10 μg / L....

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 雷恒毅李淑萍白涛王万证
Owner SUN YAT SEN UNIV
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