Transformation of Copper-laden Sludge into Photo-catalyst and Adsorbent by Thermal Treatment
Date Issued
2011
Date
2011
Author(s)
Tsai, Ping-Ju
Abstract
Copper-laden sludge is regarded as a hazardous solid waste. Therefore, stabilizing process for the sludge should be taken before disposal and reuse. Thermal process is one of the methods to stabilize the copper-laden sludge. This method has the potential to transform copper-laden sludge into copper aluminate spinel structure (CuAl2O4) in ceramic products to reduce the leaching concentration of copper. Besides, copper aluminate is also a candidate for adsorbent and photo-catalyst. The aim of this research was to investigate the feasibility of adsorbent and photo-catalyst transformed from copper-laden sludge by thermal treatment. Both the simulated sludge and field sludge were used in this study. X-ray diffraction (XRD) was applied to determine the optimum conditions for the thermal process to transform the sludge into CuAl2O4. The target pollutant was methyl orange (MO), which was used to determine the proper reaction circumstance for adsorption and photo-degradation by CuAl2O4. Results indicated that the optimum temperature and heating time for transforming the simulated sludge and field sludge into CuAl2O4 were 1100 ℃, 2 hours, and 1200 ℃, 8 hours, respectively. From the result of toxicity characteristic leaching procedure (TCLP), the leaching concentration of copper had significant reduce, which indicated the stabilizing ability of the thermal process. In adsorption and photo-catalyst experiment, under the optimal reaction, which were pH 7.5 and 35℃, the spinel synthesized from simulated sludge adsorbed or decomposed methyl orange to 67%, within three hours with a light source of the 125W mercury lamp (wavelength > 400 nm). Spinel synthesized from field sludge showed the MO removing ability also. This study demonstrated the potential that copper-laden sludge could be transformed into adsorbent or visible light photo-catalyst.
Subjects
Adsorption
copper sludge
methyl orange
photo-degradation
spinel
Type
thesis
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