Effective removal of coordinated copper from wastewater using a new dithiocarbamate-type supramolecular heavy metal precipitant.
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 0.5mgl(-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, [Cu(3)(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.
Fu
Fenglian
F
School of Environmental Science and Engineering, Zhongshan University, Guangzhou 510275, PR China.
Zeng
Haiyan
H
Cai
Qinhong
Q
Qiu
Rongliang
R
Yu
Jimmy
J
Xiong
Ya
Y
D011232:Chemical Precipitation; D003300:Copper / Q000032:analysis*; D007220:Industrial Waste / Q000032:analysis*; D046911:Macromolecular Substances / Q000737:chemistry*; D019216:Metals, Heavy / Q000032:analysis; D013859:Thiocarbamates / Q000737:chemistry*; D014874:Water Pollutants, Chemical / Q000032:analysis*; D018508:Water Purification / Q000379:methods*
D007220:Industrial Waste; D046911:Macromolecular Substances; D019216:Metals, Heavy; D013859:Thiocarbamates; D014874:Water Pollutants, Chemical; D003300:Copper