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- Title
Removal of heavy metals in electroplating wastewater by powdered activated carbon (PAC) and sodium diethyldithiocarbamate-modified PAC.
- Authors
Tae-Kyoung Kim; Taeyeon Kim; Woo-Seok Choe; Moon-Kyung Kim; Yong-Jun Jung; Kyung-Duk Zoh
- 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.
- Subjects
HEAVY metal absorption &; adsorption; ELECTROPLATING; ACTIVATED carbon; DIETHYLDITHIOCARBAMATE; FOURIER transform infrared spectroscopy
- Publication
Environmental Engineering Research, 2018, Vol 23, Issue 3, p301
- ISSN
1226-1025
- Publication type
Article
- DOI
10.4491/eer.2017.208