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Effective removal of coordinated copper from wastewater using a new dithiocarbamate-type supramolecular heavy metal precipitant |
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| Authors: | Fu Fenglian Zeng Haiyan Cai Qinhong Qiu Rongliang Yu Jimmy Xiong Ya |
| Institution: | aSchool of Environmental Science and Engineering, Zhongshan University, Guangzhou 510275, PR China bSchool of Environmental Science and Engineering, Guangdong University of Technology, Guangzhou 510090, PR China cDepartment of Chemistry and Environmental Science Programme, The Chinese University of Hong Kong, Shatin, New Territories, Hong Kong, China |
| Abstract: | A new dithiocarbamate-type heavy metal precipitant, sodium 1,3,5-hexahydrotriazinedithiocarbamate (HTDC), was prepared and used to remove coordinated copper from wastewater. In the reported dithiocarbamate-type precipitants, HTDC possesses the highest percentage of the effective functional groups. It could effectively precipitate copper to less than 0.5 mg l−1 from both synthetic and actual industrial wastewater containing CuEDTA in the range of pH 3–9. UV–vis spectral investigation and elemental analysis suggested that the precipitate was a kind of coordination supramolecular compound, Cu3(HTDC)2]n. The toxicity characteristic leaching procedure (TCLP) and semi-dynamic leaching test (SDLT) indicated that the supramolecular precipitate was non-hazardous and stable in weak acid and alkaline conditions. Tests of an anion exchange resin D231 provided a clue to simultaneously remove excess HTDC and residual CuEDTA in practical process of wastewater treatment. |
| Keywords: | Heavy metal 1 3 5-Hexahydrotriazinedithiocarbamate (HTDC) Copper Coordination supramolecular (CS) precipitant |
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