Abstract
A new effective multi-dithiocarbamate heavy metal precipitant, disodium N,N-bis-(dithiocarboxy) ethanediamine (BDE), was synthesized by mixing ethanediamine with carbon disulfide under alkaline conditions, and it was utilized for removing trace ethylenediaminetetraacetic acid copper (II) (EDTA-Cu) from wastewater. Its structure was confirmed by ultraviolet spectra, Fourier transform infrared spectra, scanning electron microscopy, thermogravimetric analysis, and elemental analysis. The removal performance of EDTA-Cu by BDE was evaluated according to BDE dosage, initial concentration, pH, and reaction time through single-factor experiments. With the optimized conditions of a pH range of 3–9, dosage ratio of BDE/Cu of 1:1, PAM dosage of 1 mg/L, and reaction time of 4 min, the removal efficiency of Cu2+ was more than 98 % from simulated wastewater containing EDTA-Cu with initial concentrations of 5–100 mg/L. Treatment of actual EDTA-Cu wastewater showed that BDE performed superior effectiveness, and the average residential concentration of Cu2+ was 0.115 mg/L. Besides, the stability of chelated precipitate and the reaction mechanism of BDE and EDTA-Cu were also introduced. The toxicity characteristic leaching procedure (TCLP) and semi-dynamic leaching test (SDLT) indicated that the chelated precipitate was non-hazardous and stable in weak acid and alkaline conditions. The BDE reacts with EDTA-Cu at a stoichiometric ratio, and the removal of Cu2+ was predominantly achieved through the replacement reaction of BDE and EDTA-Cu.
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Acknowledgments
This research was supported by the Natural Science of Guangdong-Major Basic Research and Cultivation (No.2015 A030308008), Special Fund of Department of Environmental Protection of Guangdong Province (Grant 2016), Science and Technology Planning Project of Guangdong Province (No.2016 A040403068), and Education Special Funds of University Discipline Construction of Guangdong Province (No.2014KTSP022).
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Responsible editor: Santiago V. Luis
The highlights of the study are as follow:
• A new multi-dithiocarbamate heavy metal precipitant was prepared.
• The precipitant possesses more effective performance than other sulfur-containing heavy metal precipitants at pH < 3.
• Deepened discussion of reaction mechanism and removal performance.
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Xiao, X., Ye, M., Yan, P. et al. Disodium N,N-bis-(dithiocarboxy)ethanediamine: synthesis, performance, and mechanism of action toward trace ethylenediaminetetraacetic acid copper (II). Environ Sci Pollut Res 23, 19696–19706 (2016). https://doi.org/10.1007/s11356-016-7156-5
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DOI: https://doi.org/10.1007/s11356-016-7156-5