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Preparation method of high-efficiency manganese-cerium composite adsorbent for defluoridation of drinking water

A composite adsorption and high-efficiency technology, applied in chemical instruments and methods, adsorbed water/sewage treatment, water pollutants, etc., can solve the problem of low adsorption capacity, and achieve simple preparation process, good thermal stability, and enhanced adsorption effect. Effect

Inactive Publication Date: 2011-12-07
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to overcome the shortcomings of the existing adsorbents with low adsorption capacity, and propose a method for preparing a manganese-cerium composite adsorbent that can efficiently remove fluoride ions in drinking water. By adjusting the pH, the soluble divalent manganese salt and the soluble Co-precipitation of trivalent cerium salt to prepare the adsorbent of the present invention has the characteristics of simple preparation method, high adsorption capacity, wide applicable pH range and stable performance

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Prepare 50mL of an aqueous solution of 0.4mol / L manganese sulfate and 0.016mol / L cerium nitrate. Under sufficient electromagnetic stirring, the pH of the solution was adjusted to 7.7 with 4 mol / L NaOH to obtain a precipitate. The precipitate was washed with water, dried to constant weight at 80°C, and the manganese-cerium composite adsorbent sample 1 was obtained after grinding.

[0022] The powder in Sample 1 was used to adsorb fluorine. Prepare a solution with a fluorine content of 10 mg / L, adjust its pH to 6.0, take 100 ml and add 0.01 g of adsorbent sample 1. The adsorption test was carried out at 25°C and the rotation speed was 150r / min. After adsorption equilibrium, the adsorption capacity was measured to be 29.4mg / g.

Embodiment 2

[0024] Prepare 50ml of an aqueous solution containing 0.1mol / L manganese chloride and 0.2mol / L cerium sulfate. Under sufficient electromagnetic stirring, the pH of the solution was adjusted to 7.7 with 4 mol / L NaOH to obtain a precipitate. The precipitate was washed with water and dried at 80°C to a constant weight to obtain the manganese-cerium composite adsorbent sample 2.

[0025] The powder in Sample 2 was used to adsorb fluorine. Prepare a solution with a fluorine content of 10 mg / L, adjust its pH to 6.0, take 100 ml and add 0.01 g of adsorbent sample 2. The adsorption test was carried out at 25°C and the rotation speed was 150r / min. After adsorption equilibrium, the adsorption capacity was measured to be 73.6mg / g.

Embodiment 3

[0027] Prepare 50ml of an aqueous solution containing 0.2mol / L manganese sulfate and 0.05mol / L cerium sulfate. Under sufficient electromagnetic stirring, the pH of the solution was adjusted to 8.2 with 4 mol / L NaOH to obtain a precipitate. The precipitate was washed with water and dried at 80°C to a constant weight to obtain the manganese-cerium composite adsorbent sample 3.

[0028] The powder in Sample 3 was used to adsorb fluorine. Prepare a solution with a fluorine content of 10 mg / L, adjust its pH to 6.0, take 100 ml and add 0.01 g of adsorbent sample 3. The adsorption test was carried out at 25°C and the rotation speed was 150r / min. After adsorption equilibrium, the adsorption capacity was measured to be 65.6mg / g.

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Abstract

The invention relates to a method for preparing a manganese-cerium composite adsorbent with high efficiency for fluorine removal. The preparation raw materials are soluble divalent manganese salt and soluble trivalent cerium salt, and the reaction molar ratio Mn / Ce is 0.5-25; firstly, the above-mentioned For the mixed salt solution with a molar ratio, under sufficient electromagnetic stirring conditions, use NaOH to adjust the pH of the mixed salt solution to 7.4-9.0 to obtain a precipitate, wash the precipitated product with water, and dry it at 80-600°C until it reaches a constant weight. The prepared adsorbent has a good affinity for fluorine, the adsorption capacity is more than 10 times higher than that of activated alumina, the pH range suitable for adsorption is wide, and the performance is stable, which is very suitable for defluoridation of drinking water.

Description

technical field [0001] The invention belongs to the technical field of water treatment, and in particular relates to a preparation method of a manganese-cerium composite adsorbent which can be used to efficiently adsorb and remove harmful pollutant fluorine in drinking water. Background technique [0002] High concentrations of fluoride in drinking water can endanger human health and lead to a series of diseases of teeth and bones. In my country, more than 60 million people in more than 20 provinces are affected by high fluoride drinking water, especially in rural areas. In addition, high fluoride water has also become a global problem. Studies have shown that China, India, and African countries are particularly affected. [0003] There are many kinds of defluoridation technology for drinking water, currently commonly used are chemical precipitation, adsorption, ion exchange, reverse osmosis, nanofiltration and electrodialysis. Among them, the adsorption method has the adv...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J20/06B01J20/30C02F1/28C02F1/58C02F101/14
Inventor 邓述波刘寒余刚黄俊
Owner TSINGHUA UNIV