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Study on Treatment of Wastewater Containing Chelated Copper by TiO2 Photocatalysis

Author: SunBin
Tutor: LiuGuoGuang
School: Guangdong University of Technology
Course: Environmental Science
Keywords: Nano - titanium dioxide Complex copper Ethylenediamine tetraacetic acid Photocatalytic
CLC: X703
Type: Master's thesis
Year: 2011
Downloads: 85
Quote: 0
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Abstract


Contains a large number of complexing agents in the electroplating industry most cases, emissions of wastewater containing copper metal copper complexing agent to form a stable chelate traditional chemical precipitation method can not effectively remove copper from wastewater, making containing complexing copper wastewater into the the typical electroplating wastewater processing difficulty. Photocatalytic technology developed in recent years as a new water treatment technology, high processing efficiency, thorough, non-selective, both oxidation and reduction of degradation products, no secondary pollution, etc., to receive widespread attention. Suspended TiO2 catalysts, UV irradiation, photocatalytic degradation of complex copper containing effluent by atomic absorption, and the COD tester the XRD diffractometer determination of the reactants in the reaction process variation. The investigated TiO2 dosage, solution system pH, system temperature, reaction time, and the atmosphere, and so a number of parameters, and the reaction mechanism was discussed. The results show that, with TiO2 increased dosage, EDTA-Cu removal rate increases, the removal rate of Cu (II) of the maximum of 96.56% COD removal rate could reach 59.17% But when TiO2 dosage increased to a certain extent, the degradation effect of EDTA-Cu with TiO2 dosage changes is not obvious; Cu (Ⅱ) in wastewater removal increases not reached after 40 min, the reaction obvious, while the COD removal efficiency gradually increased; within a small range of temperature change has little effect on the degradation effects of the EDTA-Cu, but the pH greater impact, in the case of pH 4, Cu (II) the go removal rate reaches the maximum, while the COD removal efficiency at a pH of 2 highest; pass into the different gases can be largely affect the efficiency of the photocatalytic reaction, and pass into the air is better than pass into the treatment effect of nitrogen, oxygen; EDTA the presence of Cu (II) of the photocatalytic reduction significant role in promoting the different complexation constants of complexing agents affect the degradation effect. Finally, through the analysis of the mechanism of photocatalytic reaction EDTA-Cu, speculated that the course of the degradation of the EDTA-Cu: the coordination bond between the EDTA-Cu is first interrupted, complexed state Cu (Ⅱ) is released, and ultimately to precipitate in the form of removal, freed of EDTA by hydroxyl free radicals direct oxidation of small molecules acids and long chain esters, ethers, and ultimately becomes NO-3, such as CO2 and H2O. From the experimental results, the nano-TiO2 photocatalytic degradation of complex copper containing effluent is feasible, and get better results.

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CLC: > Environmental science, safety science > Processing and comprehensive utilization of waste > General issues > Wastewater treatment and utilization
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