TY - JOUR

T1 - Synthesis of Co doped ZnWO4 for simultaneous oxidation of RhB and reduction of Cr(VI) under UV-light irradiation

AU - Alam, U.

AU - Khan, A.

AU - Bahnemann, D.

AU - Muneer, M.

N1 - Funding information: The authors wish to acknowledge Ministry of Mines, Govt. of India, New Delhi and Alexander Von Humboldt foundation, Germany under the research group linkage programme for financial support. DST and UGC are gratefully acknowledged for research support (DRS II, PURSE& FIST) to the Department of Chemistry . Umair Alam and Azam Khan are thankful to CSIR and UGC, New Delhi, respectively for their Senior Research Fellowship. The authors are also thankful to Mr. Mohd. Amir (Centre for Interdisciplinary Research in Basic Sciences, Jamia Millia Islamia, New Delhi) for the XRD analysis of a few samples.

PY - 2018/8

Y1 - 2018/8

N2 - In this study, one-step hydrothermal route was adopted to synthesize Co doped ZnWO 4 nanorods for efficient removal of inorganic and organic pollutants. The samples were carefully characterized by standard analytical techniques to investigate the optical, morphological and structural properties of the prepared samples. TEM analysis shows the rod-like morphology with average diameter of 60-100 nm. The activity of prepared samples was evaluated by studying the photodegradation of RhB, MB, MO, photo-reduction of Cr(VI) and simultaneous photo-oxidation and reduction of binary mixture of RhB and Cr(VI) under UV-light source. Among the series of prepared samples, 1 mol% Co doped ZnWO 4 (1 Co-ZW) showed improved photocatalytic activity in both single and mixed pollutant solutions. In the single dye solutions, a maximum degradation of 94.4%, 95% and 86.4% was obtained for RhB, MB and MO, respectively under 120 min of irradiation using 1 Co-ZW. Moreover, a maximum efficiency of 97.8% and 99% was achieved by 1 Co-ZW for the oxidation of RhB and reduction of Cr(VI), respectively from the binary (RhB + Cr(VI)) solution under the same irradiation time. The degradation results indicate that simultaneous degradation of pollutants is more prominent than that of the individual ones. The reactive species involved in the removal of RhB and Cr(VI) was determined by different scavengers and a probable mechanism for enhanced photocatalytic activity has been proposed accordingly. The present work offers an innovative approach towards the design and development of reusable catalysts to remove both organic and inorganic pollutants present in wastewater using UV-light source.

AB - In this study, one-step hydrothermal route was adopted to synthesize Co doped ZnWO 4 nanorods for efficient removal of inorganic and organic pollutants. The samples were carefully characterized by standard analytical techniques to investigate the optical, morphological and structural properties of the prepared samples. TEM analysis shows the rod-like morphology with average diameter of 60-100 nm. The activity of prepared samples was evaluated by studying the photodegradation of RhB, MB, MO, photo-reduction of Cr(VI) and simultaneous photo-oxidation and reduction of binary mixture of RhB and Cr(VI) under UV-light source. Among the series of prepared samples, 1 mol% Co doped ZnWO 4 (1 Co-ZW) showed improved photocatalytic activity in both single and mixed pollutant solutions. In the single dye solutions, a maximum degradation of 94.4%, 95% and 86.4% was obtained for RhB, MB and MO, respectively under 120 min of irradiation using 1 Co-ZW. Moreover, a maximum efficiency of 97.8% and 99% was achieved by 1 Co-ZW for the oxidation of RhB and reduction of Cr(VI), respectively from the binary (RhB + Cr(VI)) solution under the same irradiation time. The degradation results indicate that simultaneous degradation of pollutants is more prominent than that of the individual ones. The reactive species involved in the removal of RhB and Cr(VI) was determined by different scavengers and a probable mechanism for enhanced photocatalytic activity has been proposed accordingly. The present work offers an innovative approach towards the design and development of reusable catalysts to remove both organic and inorganic pollutants present in wastewater using UV-light source.

KW - Co-doped ZnWO nanorod

KW - Oxidation of RhB and synergistic effect

KW - Photoreduction of Cr(VI)

UR - http://www.scopus.com/inward/record.url?scp=85050390414&partnerID=8YFLogxK

U2 - 10.1016/j.jece.2018.07.028

DO - 10.1016/j.jece.2018.07.028

M3 - Article

VL - 6

SP - 4885

EP - 4898

JO - Journal of Environmental Chemical Engineering

JF - Journal of Environmental Chemical Engineering

IS - 4

ER -