Environmental Engineering Research

Korean Society of Environmental Engineers (대한환경공학회)
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Removal of heavy metals in electroplating wastewater by powdered activated carbon (PAC) and sodium diethyldithiocarbamate-modified PAC

  • Kim, Tae-Kyoung (Department of Environmental Health Sciences, School of Public Health, Seoul National University) ;
  • Kim, Taeyeon (Institute of Health & Environment, Seoul National University) ;
  • Choe, Woo-Seok (Department of Environmental Health Sciences, School of Public Health, Seoul National University) ;
  • Kim, Moon-Kyung (Institute of Health & Environment, Seoul National University) ;
  • Jung, Yong-Jun (Department of Environmental Engineering, College of Applied Science, Catholic University of Pusan) ;
  • Zoh, Kyung-Duk (Department of Environmental Health Sciences, School of Public Health, Seoul National University)
  • Received : 2017.12.13
  • Accepted : 2018.03.06
  • Published : 2018.09.30
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Abstract

We investigated simultaneous removal of heavy metals such as Cr, Ni, and Zn by adsorption onto powdered activated carbon (PAC) and PAC modified with sodium diethyldithiocarbamate (PAC-SDDC). Modification of PAC was confirmed by Fourier transform infrared spectroscopy and Scanning electron microscopy and energy dispersive X-ray spectroscopy. Both PAC and PAC-SDDC reached adsorption equilibrium within 48 h, and the adsorption kinetics followed a pseudo-second order reaction kinetics. The removal of metals was enhanced with increasing both adsorbent dosage and followed the descending order of Cr > Ni > Zn for PAC and Cr > Zn > Ni for PAC-SDDC, respectively. Adsorption kinetics followed pseudo-second order kinetics. Adsorption kinetic results were well fitted by the Freundlich isotherm except for Cr adsorption onto PAC. The optimum pH for heavy metal adsorption onto PAC was 5, whereas that for PAC-SDDC ranged from 7 to 9, indicating that modification of PAC with SDDC significantly enhanced heavy metal adsorption, especially under neutral and alkaline pH conditions. Our results imply that SDDC modified PAC can be applied to effectively remove heavy metals especially Cr in plating wastewaters without adjusting pH from alkaline to neutral.

Keywords

References

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