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Anionic clay adsorbent, and preparation method and application thereof

An anionic clay and adsorbent technology, applied in chemical instruments and methods, adsorption water/sewage treatment, and other chemical processes, can solve problems such as effective arsenic treatment, harmful effects on human body and environment, and achieve simple and easy preparation routes, Inexpensive, easy to store and carry

Active Publication Date: 2019-04-05
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Its composite pollution has attracted more and more attention and research in recent years, but as priority pollutants widely stipulated by countries all over the world, cadmium and arsenic will have harmful effects on human body and environment even in trace amounts
The current reported literature only focuses on shallow treatment of water bodies polluted by high concentrations of cadmium and arsenic, and does not effectively deal with the valence of arsenic. How to deal with the sudden situation of cadmium and arsenic surface water and drinking water pollution is still a big problem

Method used

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  • Anionic clay adsorbent, and preparation method and application thereof
  • Anionic clay adsorbent, and preparation method and application thereof
  • Anionic clay adsorbent, and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] A kind of anionic clay adsorbent CMZF of the present embodiment is prepared by the following steps:

[0033] (1) Weigh 0.03mol (7.68g) Mg(NO 3 ) 2 ·6H 2 O, 0.01mol Zn(NO 3 ) 2 ·6H 2 O and 0.02mol Fe(NO 3 ) 3 9H 2 O is added to 125ml deionized water and dissolved evenly to obtain a mixed metal salt solution, which is referred to as solution A, wherein the molar ratio (Mg 2+ +Zn 2+ ) / Fe 3+ = 2, Mg 2+ / Zn 2+ =3.

[0034] (2) Weigh 0.04mol (4.24g) Na 2 CO 3 Dissolve 0.106mol (4.24g) NaOH in 125ml deionized water and dissolve evenly to obtain lye, which is recorded as solution B, where the molar ratio of CO 3 2- / Fe 3+ =2,OH - / (Mg 2+ +Zn 2+ +Fe 3+ ) = 1.77. Slowly add solution B dropwise to solution A in a water bath at 70°C, continue to stir for 4 hours after the dropwise addition, then keep the water bath at 70°C for aging for 36 hours, centrifuge at 4000 rpm for 5 minutes, remove the supernatant to obtain MgZnFe double hydroxide precipitate, Wash t...

Embodiment 2

[0036] A kind of anionic clay adsorbent CMZF of the present embodiment is prepared by the following steps:

[0037] (1) Weigh 0.03mol (7.68g) Mg(NO 3 ) 2 ·6H 2 O, 0.01mol Zn(NO 3 ) 2 ·6H 2 O and 0.02mol Fe(NO 3 ) 3 9H 2 O is added to 125ml deionized water and dissolved evenly to obtain a mixed metal salt solution, which is referred to as solution A, wherein the molar ratio (Mg 2+ +Zn 2+ ) / Fe 3+ = 2, Mg 2+ / Zn 2+ =3.

[0038] (2) Weigh 0.04mol (4.24g) Na 2 CO 3 Dissolve 0.106mol (4.24g) NaOH in 125ml deionized water and dissolve evenly to obtain lye, which is recorded as solution B, where the molar ratio of CO 3 2- / Fe 3+ =2,OH - / (Mg 2+ +Zn 2+ +Fe 3+) = 1.77. Slowly add solution B dropwise to solution A in a water bath at 70°C, continue to stir for 4 hours after the dropwise addition, then keep the water bath at 70°C for aging for 36 hours, centrifuge at 4000 rpm for 5 minutes, remove the supernatant to obtain MgZnFe double hydroxide precipitate, Wash th...

Embodiment 3

[0040] A kind of anionic clay adsorbent CMZF of the present embodiment is prepared by the following steps:

[0041] (1) Weigh 0.03mol (7.68g) Mg(NO 3 ) 2 ·6H 2 O, 0.01mol Zn(NO 3 ) 2 ·6H 2 O and 0.02mol Fe(NO 3 ) 3 9H 2 O is added to 125ml deionized water and dissolved evenly to obtain a mixed metal salt solution, which is referred to as solution A, wherein the molar ratio (Mg 2+ +Zn 2+ ) / Fe 3+ = 2, Mg 2+ / Zn 2+ =3.

[0042] (2) Weigh 0.04mol (4.24g) Na 2 CO 3 Dissolve 0.106mol (4.24g) NaOH in 125ml deionized water and dissolve evenly to obtain lye, which is recorded as solution B, where the molar ratio of CO 3 2- / Fe 3+ =2,OH - / (Mg 2+ +Zn 2+ +Fe 3+ ) = 1.77. Slowly add solution B dropwise to solution A in a water bath at 70°C, continue to stir for 4 hours after the dropwise addition, then keep the water bath at 70°C for aging for 36 hours, centrifuge at 4000 rpm for 5 minutes, remove the supernatant to obtain MgZnFe double hydroxide precipitate, Wash t...

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Abstract

The invention belongs to the field of adsorption materials, and discloses an anionic clay adsorbent, and a preparation method and application thereof. The preparation method includes dropwise adding alkali liquid into a mixed metal salt solution while stirring at the temperature of 60-90 DEG C, performing heat insulation, standing and aging for 36-54 hours after dropwise adding, centrifuging the turbid liquid, washing sediments with deionized water until the sediments become neutral, drying and grinding the sediments, and calcining the sediments at the temperature of 300-600 DEG C for 3-4 hours to obtain the anionic clay adsorbent, wherein the mixed metal salt solution is made from at least two of magnesium salt, zinc salt and iron salt. The obtained anionic clay adsorbent has the advantages that visible light can be used for deeply treating initially treated low-concentration cadmium arsenic wastewater, or low-concentration cadmium arsenic domestic water and drinking water, and surface water, and the quality of the treated water can meet the regulations on cadmium and arsenic in sanitary standards of the drinking water and the water quality standards of the surface water of type-II or below.

Description

technical field [0001] The invention belongs to the field of adsorption materials, and in particular relates to an anionic clay adsorbent as well as its preparation method and application. Background technique [0002] With the development of industrial agriculture, compound pollution of anions and cations such as cadmium and arsenic occurs from time to time, seriously endangering the stability of the ecological environment and human health. Due to the differences in physical and chemical properties of cadmium and arsenic pollutants, it is very difficult to achieve advanced treatment at the same time, and the traditional precipitation method may not be able to achieve the desired effect. The adsorption method has attracted widespread attention due to its characteristics of easy operation, low price, and high efficiency. The key is to invent targeted adsorbent materials. [0003] Cadmium and arsenic have different physical and chemical properties in aqueous solution, among w...

Claims

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Application Information

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IPC IPC(8): B01J20/06B01J20/30C02F1/28C02F1/30C02F1/72C02F101/10C02F101/20
CPCB01J20/06C02F1/288C02F1/30C02F1/725C02F2101/103C02F2101/20C02F2305/10
Inventor 吴平霄刘俊钦党志朱能武
Owner SOUTH CHINA UNIV OF TECH