Kim Jong Kyu, Ahn Hosang, Kim Jong-Ho, Ban Yang-Jin, Kim Keugtae, Joo Jin Chul
Department of Civil Engineering, Kyungnam University, Changwon, 51767, Republic of Korea.
Korea Institute of Civil Engineering and Building Technology (KICT), 283 Goyang-Daero Ilsanseogu, Goyang, Gyeonggi, 10223, Republic of Korea.
J Nanosci Nanotechnol. 2018 Mar 1;18(3):2109-2112. doi: 10.1166/jnn.2018.14940.
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).
开发了创新的纳米级氧化锌-锂皂石-聚乙烯醇复合材料（NZLPc），作为纳米级光催化剂的有效替代品，用于氯化烃的矿化，且不存在纳米级光催化剂颗粒回收困难的问题。通过将纳米级氧化锌颗粒与锂皂石在聚乙烯醇溶液中混合，并在硼酸（≥1.6 M）存在下交联聚乙烯醇溶液来合成NZLPc。研究了不同的原料混合比例以开发稳定的NZLPc，并进行了X射线衍射、扫描电子显微镜、能量色散X射线光谱和透射电子显微镜表征。结果表明，按重量计氧化锌、锂皂石、聚乙烯醇和去离子水的比例为3:1:1:10适合形成具有高孔隙率和增强机械强度的球形NZLPc。此外，NZLPc和紫外线照射均显著提高了三氯乙烯的降解效率，表明发生了氧化锌介导的多相光催化降解。因此，所提出的NZLPc合成方法为通过多反应过程（即吸附、光解和光催化）经济有效地光催化去除水中难降解有机化合物铺平了道路。
