title: Comparative investigation of N,N'-bis-(dithiocarboxy)piperazine and diethyldithiocarbamate as precipitants for Ni(II) in simulated wastewater.
abstract: The performances of a coordination polymerization precipitant, N,N'-bis-(dithiocarboxy)piperazine (BDP) were compared with the widely used heavy metal precipitant, diethyldithiocarbamate (DDTC), through the treatment of three kinds of nickel-containing wastewaters, NiSO(4), nickel citrate (NiCA) and Ni(2+)-dye. Results indicated that both BDP and DDTC at their stiochiometric doses could reduce 50.00 mg l(-1) free nickel(II) to lower than 1.0 mg l(-1) (discharge limit of nickel ions in China) and 10% precipitants doses increase could treat NiCA containing 50.00 mg l(-1) Ni(2+) to meet the discharge limit. But [NiBDP](n) coordination polymerization precipitates had more rapid settling speed than Ni(DDTC)(2) precipitates. It was also observed that BDP could still partly remove Reactive Brilliant Red X-3B from Ni(II)-dye integrated wastewater through the adsorption of the precipitates [NiBDP](n), in addition to precipitating Ni(II). A 1:1 stiochiometric dose of BDP/Ni(II) could decrease Ni(II) from 50.00 to 0.87 mg l(-1), and simultaneously reduce the dye from 30.00 to 19.52 mg l(-1).
authors.affiliation: School of Environmental Science and Engineering, Zhongshan University, Guangzhou 510275, PR China.
authors.forename: Fenglian
authors.initials: F
authors.lastname: Fu
authors.forename: Runming
authors.initials: R
authors.lastname: Chen
authors.forename: Ya
authors.initials: Y
authors.lastname: Xiong
mesh_terms: D000327:Adsorption; D011232:Chemical Precipitation; D004050:Ditiocarb / Q000737:chemistry*; D009532:Nickel / Q000737:chemistry*; D010879:Piperazines / Q000737:chemistry*; D013056:Spectrophotometry, Ultraviolet; D014874:Water Pollutants, Chemical / Q000032:analysis*
chemical_list: C519950:N,N'-bis-(dithiocarboxy)piperazine; D010879:Piperazines; D014874:Water Pollutants, Chemical; D009532:Nickel; D004050:Ditiocarb