title: Disodium N,N-bis-(dithiocarboxy)ethanediamine: synthesis, performance, and mechanism of action toward trace ethylenediaminetetraacetic acid copper (II).
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 Cu(2+) 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 Cu(2+) 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 Cu(2+) was predominantly achieved through the replacement reaction of BDE and EDTA-Cu.
authors.affiliation: School of Environmental Science and Engineering, Guangdong University of Technology, Guangzhou, 510006, People's Republic of China.|Key Laboratory of Mining and Metallurgy Industry Heavy Metals Pollution Control and Vocational Education of Environmental Protection of Guangdong Province, Guangzhou, 510006, People's Republic of China.
authors.forename: Xiao
authors.initials: X
authors.lastname: Xiao
authors.affiliation: School of Environmental Science and Engineering, Guangdong University of Technology, Guangzhou, 510006, People's Republic of China.|Key Laboratory of Mining and Metallurgy Industry Heavy Metals Pollution Control and Vocational Education of Environmental Protection of Guangdong Province, Guangzhou, 510006, People's Republic of China.
authors.forename: Maoyou
authors.initials: M
authors.lastname: Ye
authors.affiliation: School of Environmental Science and Engineering, Guangdong University of Technology, Guangzhou, 510006, People's Republic of China.|Key Laboratory of Mining and Metallurgy Industry Heavy Metals Pollution Control and Vocational Education of Environmental Protection of Guangdong Province, Guangzhou, 510006, People's Republic of China.
authors.forename: Pingfang
authors.initials: P
authors.lastname: Yan
authors.affiliation: School of Environmental Science and Engineering, Guangdong University of Technology, Guangzhou, 510006, People's Republic of China.|Key Laboratory of Mining and Metallurgy Industry Heavy Metals Pollution Control and Vocational Education of Environmental Protection of Guangdong Province, Guangzhou, 510006, People's Republic of China.
authors.forename: Yiqin
authors.initials: Y
authors.lastname: Qiu
authors.affiliation: School of Environmental Science and Engineering, Guangdong University of Technology, Guangzhou, 510006, People's Republic of China. sysun@gdut.edu.cn.|Key Laboratory of Mining and Metallurgy Industry Heavy Metals Pollution Control and Vocational Education of Environmental Protection of Guangdong Province, Guangzhou, 510006, People's Republic of China. sysun@gdut.edu.cn.|Guangdong Polytechnic of Environmental Protection Engineering, Foshan, 528216, People's Republic of China. sysun@gdut.edu.cn.
authors.forename: Shuiyu
authors.identifier: http://orcid.org/0000-0002-4240-2986
authors.initials: S
authors.lastname: Sun
authors.affiliation: School of Environmental Science and Engineering, Guangdong University of Technology, Guangzhou, 510006, People's Republic of China.|Key Laboratory of Mining and Metallurgy Industry Heavy Metals Pollution Control and Vocational Education of Environmental Protection of Guangdong Province, Guangzhou, 510006, People's Republic of China.
authors.forename: Jie
authors.initials: J
authors.lastname: Ren
authors.affiliation: School of Environmental Science and Engineering, Guangdong University of Technology, Guangzhou, 510006, People's Republic of China.|Key Laboratory of Mining and Metallurgy Industry Heavy Metals Pollution Control and Vocational Education of Environmental Protection of Guangdong Province, Guangzhou, 510006, People's Republic of China.
authors.forename: Yongkang
authors.initials: Y
authors.lastname: Dai
authors.affiliation: School of Environmental Science and Engineering, Guangdong University of Technology, Guangzhou, 510006, People's Republic of China.|Key Laboratory of Mining and Metallurgy Industry Heavy Metals Pollution Control and Vocational Education of Environmental Protection of Guangdong Province, Guangzhou, 510006, People's Republic of China.
authors.forename: Dajian
authors.initials: D
authors.lastname: Han
mesh_terms: D002614:Chelating Agents / Q000737:chemistry*; D003300:Copper / Q000032:analysis / Q000737:chemistry*; D004492:Edetic Acid / Q000737:chemistry*; D019216:Metals, Heavy / Q000032:analysis; D013859:Thiocarbamates / Q000737:chemistry*; D062065:Wastewater / Q000032:analysis; D014874:Water Pollutants, Chemical / Q000737:chemistry*
chemical_list: D002614:Chelating Agents; D003300:Copper; D004492:Edetic Acid; D019216:Metals, Heavy; D013859:Thiocarbamates; D062065:Wastewater; D014874:Water Pollutants, Chemical; C000617654:N,N-bis-(dithiocarboxy)ethanediamine
keywords: Ethylenediaminetetraacetic acid copper (II); Leaching characteristic; N,N-bis-(dithiocarboxy) ethanediamine; Reaction mechanism; Removal performance