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Method for efficiently removing high-concentration dye wastewater by combination of adsorption and photocatalysis

A dye wastewater, high-concentration technology, used in chemical instruments and methods, adsorption water/sewage treatment, light water/sewage treatment, etc., can solve the problems of reduced photocatalytic efficiency and slow mass transfer, and improve photocatalytic performance. Effect

Inactive Publication Date: 2012-07-18
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It avoids the defects of the traditional single photocatalyst during the use process, due to the strong absorption of light by the dye wastewater, which leads to the serious reduction of photocatalytic efficiency and the slow mass transfer rate of pollutants in the solution, which leads to the reduction of photocatalytic efficiency.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Disperse 3g of chitosan powder and 2g of titanium dioxide nanopowder in 98ml of water, then add 2ml of acetic acid, stir for a few minutes, continue to add 0.6g of sodium bicarbonate, stir until uniform; continue to add 25ml of formaldehyde for pre-crosslinking, and react for 30min; If it forms a solid, continue stirring. Rinse well and add to 200ml of lye, adjust the pH value to 10, then add 2ml of epichlorohydrin, crosslink at 70°C for 4 hours; filter, rinse repeatedly, and finally pickle with 100ml of 1mol / L hydrochloric acid solution for 8min ; Filtration, repeated washing until neutral, and freeze-drying to obtain the cross-linked chitosan / titanium dioxide hybrid material. The obtained cross-linked chitosan / titanium dioxide hybrid nanomaterial is placed in a closed device with high-speed blade rotation, the rotation speed is 0-22500 rpm, and the time is 1-5 minutes. Add 15mg of this material to 20mL of methyl orange solution with a concentration of 50mg / L, place i...

Embodiment 2

[0023] Disperse 3g of chitosan powder and 2g of nano titanium dioxide powder in 98ml of water, then add 2ml of acetic acid, stir for a few minutes, continue to add 25ml of formaldehyde for pre-crosslinking, and react for 30min; if it forms a solid during the process, continue to stir. Rinse well and add to 200ml of lye, adjust the pH value to 10, then add 2ml of epichlorohydrin, crosslink at 70°C for 4 hours; filter, rinse repeatedly, and finally pickle with 100ml of 1mol / L hydrochloric acid solution for 8min ; Filtration, repeated washing until neutral, and freeze-drying to obtain the cross-linked chitosan / titanium dioxide hybrid material. The obtained cross-linked chitosan / titanium dioxide hybrid nanomaterial is placed in a closed device with high-speed blade rotation, the rotation speed is 0-22500 rpm, and the time is 1-5 minutes. Add 15 mg of this material to 20 mL of a methyl orange solution with a concentration of 50 mg / L, place it in a quartz vessel, and conduct a photo...

Embodiment 3

[0025] Disperse 3g of chitosan powder and 2g of titanium dioxide nanopowder in 98ml of water, then add 2ml of acetic acid, stir for a few minutes, continue to add 0.6g of sodium bicarbonate, stir until uniform; continue to add 25ml of formaldehyde for pre-crosslinking, and react for 30min; If it forms a solid, continue stirring. Rinse well and add to 200ml of lye, adjust the pH value to 10, then add 2ml of epichlorohydrin, crosslink at 70°C for 4 hours; filter, rinse repeatedly, and finally pickle with 100ml of 1mol / L hydrochloric acid solution for 8min ; Filtration, repeated washing until neutral, and freeze-drying to obtain the cross-linked chitosan / titanium dioxide hybrid material. The obtained cross-linked chitosan / titanium dioxide hybrid nanomaterial is placed in a closed device with high-speed blade rotation, the rotation speed is 0-22500 rpm, and the time is 1-5 minutes. Add 15mg of this material to 20mL malachite green solution with a concentration of 80mg / L, place it...

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Abstract

The invention belongs to the technical field of new environment nanometer functional materials and particularly relates to a method for efficiently removing high-concentration dye wastewater by combination of adsorption and photocatalysis. The method is implemented by the following steps that: a crosslinked chitosan / titanium dioxide nanometer hybridization material is prepared and then is added into the high-concentration dye wastewater, the reaction is continued for several hours under the illumination of an ultraviolet lamp, and then the dye wastewater is completely purified. The crosslinked chitosan / titanium dioxide nanometer hybridization material adopted in the method fully utilizes the excellent adsorbability of crosslinked chitosan and the excellent photocatalysis of titanium dioxide so as to perform hybridization and composition on the functional material with double performances of adsorption and photocatalysis and to realize purification and removal of the high-concentration dye wastewater; and in the process of continuous illumination, dye adsorbed on the surface of the hybridization material is slowly mineralized under the photocatalysis of the titanium dioxide, thereby realizing regeneration of the nanometer hybridization material. According to the invention, the raw materials are simple and easy to obtain, the preparation technology is simple, the conditions are easy to control, the cost is low, and thus the method is applicable to the continuous large-scale and volume production of the nanometer hybridization material.

Description

technical field [0001] The invention belongs to the technical field of environmental nano-new functional materials, and specifically relates to a method for efficiently removing high-concentration dye wastewater in combination with adsorption-photocatalysis. The adsorption-photocatalyst can be regenerated by continuous photocatalysis of ultraviolet light after use. Background technique [0002] With the rapid development of my country's printing and dyeing industry and chemical industry, about 600-700 million tons of printing and dyeing wastewater are discharged into the environment every year in my country, and dye wastewater has become one of the key sources of environmental pollution. The dye industry has a wide variety and complex processes. Dye wastewater has the characteristics of complex components, high chroma, high COD and BOD concentrations, high suspended solids, large changes in water quality and water volume, and many refractory substances. It is one of the mor...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/32C02F1/28B01J20/24B01J21/06
Inventor 马杰陈君红陈璐怀静龚文怡袁志文
Owner TONGJI UNIV
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