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Catalysts 2016, 6(10), 152; doi:10.3390/catal6100152

Enhanced Removal of Trichloroethylene in Water Using Nano-ZnO/Polybutadiene Rubber Composites

1
Environmental and Plant Engineering Research Institute, University of Science & Technology, Goyang 10223, Korea
2
Environmental and Plant Engineering Research Institute, Korea Institute of Civil Engineering and Building Technology, Goyang 10223, Korea
3
Department of Chemical Engineering, Chonnam National University, Gwangju 61186, Korea
4
Department of Civil Engineering, University of Kyungnam, Changwon 51767, Korea
5
Department of Civil and Environmental Engineering, Hanbat National University, Daejeon 34158, Korea
*
Authors to whom correspondence should be addressed.
Academic Editor: Keith Hohn
Received: 6 July 2016 / Revised: 13 September 2016 / Accepted: 21 September 2016 / Published: 27 September 2016
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Abstract

An innovative nanoscale ZnO/polybutadiene rubber composite (ZBRC) was developed as a valid alternative to TiO2 particles or immobilized TiO2 for the mineralization of chlorinated hydrocarbons without difficulties in the recovery of nanoscale photocatalyst particles. A synergistic increase in the removal of 1,1,2-trichloroethylene (TCE) through the coupled reaction processes (i.e., sorption, photolysis, and photocatalysis) was observed because sorption of TCE to the ultraviolet(UV)-transparent polybutadiene rubber occurred, and was coupled with the heterogeneous photocatalytic reactions with nanoscale ZnO particles on the surface of ZBRC. The removal rate of TCE decreased with an increase in the initial concentration of TCE because of both inhibited generation of electron–hole pairs and deficiency of photons to activate ZnO particles. Also, the TCE removal rate increased as the loading amount of ZBRC increased. Based on satisfactory linear regressions (R2 ≥ 0.94) between the apparent degradation rate constant (Kapp) and the initial concentration vs. the ZBRC loading amount, the Kapp values can be estimated, a priori, without performing photocatalytic experiments. The removal efficiencies were more significantly affected by the changes in the initial concentration of TCE and the ZBRC loading amounts than by the changes in light intensity and pH in aqueous solutions. From the results of response surface analysis, the greater removal efficiencies of TCE were achieved with higher pH values, greater amounts of ZBRC, and greater intensity of light. Based on these results, newly-developed ZBRC with both high removal efficiency and low cost performs as a valid alternative to TiO2 particles or immobilized TiO2 for the mineralization of chlorinated hydrocarbons in various environmental and industrial matrices. View Full-Text
Keywords: coupled reaction processes; nanoscale ZnO/polybutadiene rubber composites (ZBRC); photolysis; photocatalysis; response surface analysis; sorption; trichloroethylene coupled reaction processes; nanoscale ZnO/polybutadiene rubber composites (ZBRC); photolysis; photocatalysis; response surface analysis; sorption; trichloroethylene
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MDPI and ACS Style

Jang, D.G.; Ahn, C.H.; Choi, J.S.; Kim, J.H.; Kim, J.K.; Joo, J.C. Enhanced Removal of Trichloroethylene in Water Using Nano-ZnO/Polybutadiene Rubber Composites. Catalysts 2016, 6, 152.

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