title: Quick and efficient co-treatment of Zn(2+)/Ni(2+) and CN(-) via the formation of Ni(CN)4(2-) intercalated larger ZnAl-LDH crystals.
abstract: The wide use of metal electroplating involving CN(-) necessitates the cost-effective treatment of both CN and metals (Zn, Cu, Ni etc.). In this research, we developed a novel strategy - Ni(2+)-assisted layered double hydroxide (LDH) precipitation - to simultaneously remove aqueous CN and Zn/Ni metals. The strategy is to convert CN(-)/Zn(CN)4(2-) to Ni(CN)4(2-) first, and then to quickly precipitate Ni(CN)4(2-)/CN(-) into LDH crystals. The conversion has been clearly evidenced by the change of CN characteristic FTIR bands of Zn-CN solution before and after adding Ni(NO3)2. The intercalation and efficient removal of CN have also been confirmed through the formation of LDH crystals XRD and SEM. In particular, a set of optimized experimental factors has been obtained by investigating their effects on CN removal efficiency in the simulated tests. Remarkably, over 95% CN were removed with high removal efficiencies of metals. Our results thus suggest that the current strategy is a quick, efficient and promising way to simultaneously treat both Ni and metals/CN rich electroplating wastewaters.
authors: School of Environmental and Chemical Engineering, Shanghai University, No. 99 Shangda Rd., Shanghai 200444, PR China.
authors: Ji Zhi
authors: JZ
authors: Zhou
authors: School of Environmental and Chemical Engineering, Shanghai University, No. 99 Shangda Rd., Shanghai 200444, PR China.
authors: Ying
authors: Y
authors: Liang
authors: School of Environmental and Chemical Engineering, Shanghai University, No. 99 Shangda Rd., Shanghai 200444, PR China.
authors: Jia
authors: J
authors: Zhang
authors: ARC Centre of Excellence for Functional Nanomaterials, Australian Institute of Bioengineering and Nanotechnology, The University of Queensland, Brisbane, QLD 4072, Australia.
authors: Li
authors: L
authors: Li
authors: School of Environmental and Chemical Engineering, Shanghai University, No. 99 Shangda Rd., Shanghai 200444, PR China.
authors: Yunfeng
authors: Y
authors: Xu
authors: School of Environmental and Chemical Engineering, Shanghai University, No. 99 Shangda Rd., Shanghai 200444, PR China.
authors: Xiuxiu
authors: X
authors: Ruan
authors: School of Environmental and Chemical Engineering, Shanghai University, No. 99 Shangda Rd., Shanghai 200444, PR China. Electronic address: grqian@shu.edu.cn.
authors: Guangren
authors: G
authors: Qian
authors: School of Environmental and Chemical Engineering, Shanghai University, No. 99 Shangda Rd., Shanghai 200444, PR China; ARC Centre of Excellence for Functional Nanomaterials, Australian Institute of Bioengineering and Nanotechnology, The University of Queensland, Brisbane, QLD 4072, Australia. Electronic address: gordonxu@uq.edu.au.
authors: Zhi Ping
authors: ZP
authors: Xu
mesh_terms: D000535:Aluminum / Q000737:chemistry*; D003460:Crystallization; D003486:Cyanides / Q000737:chemistry*; D004595:Electroplating; D006878:Hydroxides / Q000737:chemistry*; D007220:Industrial Waste; D009532:Nickel / Q000737:chemistry*; D014865:Waste Disposal, Fluid; D014874:Water Pollutants, Chemical / Q000032:analysis; D015032:Zinc / Q000737:chemistry*
chemical_list: D003486:Cyanides; D006878:Hydroxides; D007220:Industrial Waste; D014874:Water Pollutants, Chemical; D009532:Nickel; D000535:Aluminum; D015032:Zinc
keywords: Cyanide complex; Cyanide removal; Electroplating wastewater treatment; Larger crystals; Layered double hydroxide