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A kind of cerium iron trivalent arsenic adsorbent and its preparation method and application

A trivalent arsenic and adsorbent technology, applied in chemical instruments and methods, adsorption water/sewage treatment, other chemical processes, etc., can solve problems such as high loss rate, reduced arsenic adsorption capacity, narrow application range, etc., and achieve loss rate Low cost, simple preparation process, and easy-to-obtain effect

Active Publication Date: 2021-09-28
CHANGSHU INSTITUTE OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, these metal oxide adsorbents have a narrow pH range and tend to aggregate into large particles, resulting in reduced arsenic adsorption capacity and a high loss rate during the adsorption process.

Method used

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  • A kind of cerium iron trivalent arsenic adsorbent and its preparation method and application
  • A kind of cerium iron trivalent arsenic adsorbent and its preparation method and application
  • A kind of cerium iron trivalent arsenic adsorbent and its preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1 2

[0027] Example 1 The influence of the molar ratio of ferrous iron Fe(II), ferric iron Fe(III), and trivalent cerium Ce(III) on the adsorption of trivalent arsenic by the prepared cerium-iron trivalent arsenic adsorbent

[0028] 1. According to the molar ratio of ferrous iron Fe(II), ferric iron Fe(III), and trivalent cerium Ce(III), the molar ratios are 3:1:0.5, 3:1:0.7, 3:1:0.9, 2:1 :1, 2.5:1:1, 2.8:1:1, 3:1:1, 4:1:1, 5:1:1, 3:1:1.5, 4:1:1.5, 5:1:1.5 , 3:1:2, 4:1:2, 5:1:2, 5.2:1:2, 5.5:1:2, 6:1:2, 5:1:2.1, 5:1:2.3, 5 : 1: 2.5, weigh ferrous chloride, ferric chloride, cerium chloride of corresponding quality respectively, mix, obtain 21 groups of mixed ferric cerium powders.

[0029] 2. According to the solid-liquid ratio of 1:1 mg / mL, mix 21 groups of mixed iron-cerium powders into 21 groups of distilled water respectively, stir until completely dissolved in a sealed state, and prepare 21 groups of iron-cerium solutions.

[0030] 3. Grind tuff and pass through a 200-mesh si...

Embodiment 2

[0041] Example 2 The influence of sodium hydroxide concentration on the adsorption of trivalent arsenic by the prepared cerium-iron trivalent arsenic adsorbent

[0042] According to the molar ratio of ferrous iron Fe(II), ferric iron Fe(III) and trivalent cerium Ce(III) is 5:1:2, respectively weigh ferrous chloride, ferric chloride, chloride Cerium, mix and prepare 9 groups of mixed iron-cerium powder of equal quality. Mix the mixed iron-cerium powder into distilled water according to the solid-liquid ratio of 1:2 mg / mL, stir until completely dissolved in a sealed state, and prepare 9 groups of iron-cerium solutions of equal quality. Grind tuff and pass through a 300-mesh sieve to obtain tuff powder. According to the solid-liquid ratio of 1:2 mg / mL, 9 groups of tuff powders of equal mass were mixed into 9 groups of iron-cerium solutions respectively, and stirred for 1.5 hours under sealed conditions to obtain 9 groups of tuff-cerium mixed slurries. Weigh sodium hydroxide, mi...

Embodiment 3

[0049] Example 3 Influence of tuff powder and iron-cerium solution solid-liquid ratio on the adsorption of trivalent arsenic by the prepared cerium-iron trivalent arsenic adsorbent

[0050] According to the molar ratio of ferrous iron Fe(II), ferric iron Fe(III) and trivalent cerium Ce(III) is 5:1:2, respectively weigh ferrous chloride, ferric chloride, chloride Cerium, mix and prepare 9 groups of mixed iron-cerium powder of equal quality. Mix the mixed ferric cerium powder into distilled water according to the solid-liquid ratio of 1:3 mg / mL, stir until completely dissolved in a sealed state, and prepare 9 groups of ferric cerium solutions of equal mass. Grind tuff and pass through a 400-mesh sieve to obtain tuff powder. According to the solid-liquid ratio 1:0.5mg / mL, 1:0.7mg / mL, 1:0.9mg / mL, 1:1mg / mL, 1:2mg / mL, 1:3mg / mL, 1:3.2mg / mL, 1: 3.5 mg / mL, 1: 4 mg / mL, 9 groups of tuff powders of equal mass were mixed into the corresponding 9 groups of iron-cerium solutions, and stirr...

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PUM

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Abstract

The invention discloses a cerium-iron trivalent arsenic adsorbent and its preparation method and application. Ferrous chloride, ferric chloride and cerium chloride are respectively weighed and mixed to obtain mixed iron-cerium powder; the mixed iron-cerium powder is mixed into into distilled water and stirred until completely dissolved in a sealed state to prepare iron-cerium solution; grind tuff to obtain tuff powder; mix tuff powder into the iron-cerium solution and stir under sealed condition to obtain tuff-cerium mixed slurry; mix sodium hydroxide The solution is mixed with tuff iron-cerium slurry, mixed, stirred evenly in a sealed state, aged at 30-90°C for 2-4 hours, vacuum-dried until the quality is constant, and ground to obtain a cerium-iron trivalent arsenic adsorbent. The adsorbent prepared by the invention can achieve the highest removal capacity of 98.94% trivalent arsenic ions. The cerium-iron trivalent arsenic adsorbent prepared by the invention has a lower loss rate during the adsorption test. The invention is applicable to the removal of trivalent arsenic pollutants whose solution pH is in the range of 2 to 12.

Description

technical field [0001] The invention relates to the technical field of sewage treatment, in particular to a cerium-iron trivalent arsenic adsorbent and a preparation method and application thereof. Background technique [0002] Due to the high toxicity and carcinogenicity of arsenic pollutants, the problem of arsenic polluted water and soil has attracted increasing attention. Long-term drinking of arsenic-contaminated water can lead to skin cancer, liver and kidney failure, and irreversible damage to the bladder. Based on the impact of arsenic pollutants on human health, the current World Health Organization guidelines recommend reducing the maximum allowable concentration of arsenic in drinking water from the previous 50 μg / L to the current 10 μg / L. Therefore, in order to make drinking water meet stricter standards, the flow direction of arsenic pollutants must be strictly controlled, and the concentration of arsenic pollutants in water bodies must be eliminated and reduce...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J20/16B01J20/30C02F1/28C02F101/10
CPCB01J20/0207B01J20/0229B01J20/16C02F1/281C02F2101/103
Inventor 黄涛宋东平刘万辉金俊勋刘龙飞张树文徐娇娇
Owner CHANGSHU INSTITUTE OF TECHNOLOGY