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Method for preparing activated carbon self-assembled bismuth vanadate water treatment agent

A water treatment agent and self-assembly technology, which can be used in energy and wastewater treatment, water/sewage treatment, botany equipment and methods, etc., can solve problems such as unfavorable sustainable development, and achieve good application prospects, low cost and simple process. Effect

Inactive Publication Date: 2011-11-23
DONGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The methods currently used to treat wastewater mainly include: physical separation, biodegradation, and chemical decomposition, but these methods have certain limitations and are not conducive to sustainable development.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] (1) Add bismuth nitrate and disodium edetate into phosphate buffer, stir for 15 minutes to form a suspension; dissolve sodium metavanadate in phosphate buffer, and add dropwise to the In the suspension, a transparent solution is formed; wherein the mol ratio of bismuth salt, stabilizer and metavanate is 0.01: 0.01: 0.01, and the phosphate buffer is composed of 0.025mol / L sodium dihydrogen phosphate solution and 0.05mol / L L sodium hydrogen phosphate solution composition;

[0022] (2) Adjust the pH value of the above-mentioned transparent solution to 4.5 with a sodium hydroxide aqueous solution with a concentration of 0.5mol / L, then add gac at 20°C, stir, reflux for 6h, filter to obtain a yellow product, and finally place the product at 150 It can be baked at ℃ for 2 hours; the weight ratio of bismuth salt to activated carbon is 1:5.

Embodiment 2

[0024] (1) Add bismuth carbonate and sodium gluconate to phosphate buffer, stir for 35 minutes to form a suspension; dissolve ammonium metavanadate in phosphate buffer, and add dropwise to the suspension , forming a transparent solution; wherein the molar ratio of bismuth salt, stabilizer and metavanate is 0.06:0.03:0.01, and the phosphate buffer is composed of 0.03mol / L sodium dihydrogen phosphate solution and 0.08mol / L sodium hydrogen phosphate Solution composition;

[0025] (2) Adjust the pH value of the above-mentioned transparent solution to 7 with a potassium hydroxide aqueous solution with a concentration of 1mol / L, then add activated carbon at 80°C, stir, reflux for 15h, filter to obtain a yellow product, and finally put the resulting product at 210°C It can be baked for 3 hours; the weight ratio of bismuth salt to activated carbon is 1:12.

Embodiment 3

[0027] (1) Add bismuth acetate and butane tetracarboxylic acid to phosphate buffer, stir for 60 minutes to form a suspension; dissolve sodium metavanadate in phosphate buffer, and add dropwise to the suspension In the solution, a transparent solution is formed; wherein the molar ratio of bismuth salt, stabilizer and metavanate is 0.15:0.05:0.15, and the phosphate buffer is composed of 0.05mol / L sodium dihydrogen phosphate solution and 0.1mol / L phosphoric acid Sodium hydrogen forms a solution;

[0028] (2) Adjust the pH value of the above-mentioned transparent solution to 9 with a sodium hydroxide aqueous solution with a concentration of 1.5mol / L, then add gac at 100°C, stir, reflux for 24h, filter to obtain a yellow product, and finally place the product at 280 It can be baked at ℃ for 4 hours; the weight ratio of bismuth salt to activated carbon is 1:20.

[0029] Taking printing and dyeing wastewater as the treatment object, the water treatment agents obtained in Examples 1 ...

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Abstract

The invention relates to a method for preparing an activated carbon self-assembled bismuth vanadate water treatment agent, which comprises the following steps of: (1) adding bismuth salt and a stabilizer into phosphate buffer, and stirring for 15 to 60 minutes to form suspension; and dissolving metavanadate in the phosphate buffer, and adding into the suspension to form transparent solution; and (2) regulating the pH value of the transparent solution to be between 4.5 and 9 by using alkaline solution, adding activated carbon in a mass ratio of the activated carbon to the bismuth salt in the step (1) of 5:1-20:1 at the temperature of between 20 and 100 DEG C, performing reflux reaction for 6 to 24 hours with stirring, and filtering and baking a product. The method is low in cost and simple; and the prepared water treatment agent is suitable for the advanced treatment of multiple kinds of wastewater, is environment-friendly, avoids secondary pollution, can overcome the defects of the conventional bismuth-based water treatment agent, has a good water treatment effect and a good application prospect, and can be recycled.

Description

technical field [0001] The invention belongs to the field of preparation of water treatment agents, in particular to a preparation method of activated carbon self-assembled bismuth vanadate water treatment agent. Background technique [0002] Only about 10% of the world's water is directly used by humans. The largest share, 70%, is used in agriculture, and the remaining 20% ​​is used in industry. China's sewage is about 20% of the world's, but it only gets 5% of the world's fresh water. Therefore, solving the pollution problem is on the agenda. In the process of textile printing and dyeing, leather, and paper-making industries, a large number of additives that pollute the environment and are harmful to the human body are used. Most of these additives are discharged in the form of liquid and pollute the environment. They have poor biodegradability, high toxicity, and high free formaldehyde content. The content of heavy metal ions exceeds the standard. Among them, printing...

Claims

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Application Information

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IPC IPC(8): B01J23/22B01J20/20C02F1/30C02F1/28C02F1/58C02F1/62A01N59/16A01P1/00
CPCY02W10/37
Inventor 何瑾馨刘保江董霞
Owner DONGHUA UNIV