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Preparation of Nanoscale Zinc Oxide-Laponite Composites by Polyvinyl Alcohol Polymerization and Usability for Removal of Trichloroethylene in Water

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Innovative nanoscale ZnO-laponite-polyvinyl alcohol composites (NZLPc) were developed as a valid alternative to nanoscale photocatalysts for mineralization of chlorinated hydrocarbons without difficulties in recovery of nanoscale photocatalyst particles. NZLPc were synthesized by mixing nanoscale ZnO particles with laponite in PVA solution, and by crosslinking PVA solution in the presence of boric acid (≥1.6 M). Different mixing ratios of the raw materials were investigated to develop the stable NZLPc, and X-ray diffraction, scanning electron microscopy, energy-dispersive X-ray spectroscopy, and transmission electron microscopy characterizations were performed. From the results, a 3:1:1:10 ratio of ZnO, laponite, PVA, and deionized water by weight was appropriate to form spherical NZLPc with high porosities and enhanced mechanical strengths. Also, the degradation efficiencies of trichloroethylene were significantly improved with both NZLPc and UV irradiation, indicating that ZnO-mediated heterogeneous photocatalytic degradation occurred. Thus, the proposed synthesis of NZLPc paves a way for the economical and effective photocatalytic approach to remove the recalcitrant organic compounds in water through the multiple reaction processes (i.e., sorption, photolysis, and photocatalysis).
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Keywords: Boric Acid; Photocatalytic Degradation; Trichloroethylene; ZnO-Laponite-Polyvinyl Alcohol Composites

Document Type: Research Article

Affiliations: 1: Department of Civil Engineering, Kyungnam University, Changwon, 51767, Republic of Korea 2: Korea Institute of Civil Engineering and Building Technology (KICT), 283 Goyang-Daero Ilsanseogu, Goyang, Gyeonggi, 10223, Republic of Korea 3: Department of Chemical Engineering, Chonnam National University, 77 Yongbong-ro, Buk-gu, Gwangju, 61186, Republic of Korea 4: Geum River Weir Office, K-Water, 33127, Republic of Korea 5: Gyeonggi Health Environment Institute, 95, Pajangcheon-ro, Jangan-gu, Suwon-si, Gyeonggi-do, 16205, Republic of Korea 6: Department of Civil and Environmental Engineering, Hanbat National University, Daejeon-si, 34158, Republic of Korea

Publication date: March 1, 2018

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  • Journal for Nanoscience and Nanotechnology (JNN) is an international and multidisciplinary peer-reviewed journal with a wide-ranging coverage, consolidating research activities in all areas of nanoscience and nanotechnology into a single and unique reference source. JNN is the first cross-disciplinary journal to publish original full research articles, rapid communications of important new scientific and technological findings, timely state-of-the-art reviews with author's photo and short biography, and current research news encompassing the fundamental and applied research in all disciplines of science, engineering and medicine.
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