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Articles by Yihang Guo
Total Records ( 2 ) for Yihang Guo
  Leilei Xu , Wei Li , Jianglei Hu , Xia Yang and Yihang Guo
  Mesoporous Ta2O5 materials functionalized with both alkyl group and a Keggin-type heteropoly acid, Ta2O5/SiO2-[H3PW12O40/R] (R = Me or Ph), was prepared by a single step sol–gel co-condensation method followed by a hydrothermal treatment in the presence of a triblock copolymer surfactant. The catalytic performance of the resulting multifunctionalized organic–inorganic hybrid materials was evaluated by a direct use of soybean oil for biodiesel production in the presence of 20 wt% myristic acid under atmosphere refluxing, and the influences of the catalyst preparation approaches, functional component loadings, and molar ratios of oil to methanol on the catalytic activity of the Ta2O5/SiO2-[H3PW12O40/R] were studied. In addition, the recyclability of the hybrid materials was evaluated via four catalytic runs. Finally, the network structures of the hybrid materials and the functions of the incorporated alkyl groups on the catalytic activity of the materials were put forward.
  Jinhuan Li , Xia Yang , Xiaodan Yu , Leilei Xu , Wanli Kang , Wenhua Yan , Hongfeng Gao , Zhonghe Liu and Yihang Guo
  Rare-earth oxide-doped titania nanocomposites (RE3+/TiO2, where RE=Eu3+, Pr3+, Gd3+, Nd3+, and Y3+) were prepared by a one-step sol–gel-solvothermal method. The products exhibited anatase phase structure, mesoporosity, and interesting surface compositions with three oxygen species and two titanium species. The products were used as the photocatalysts to degrade a partially hydrolysis polyacrylamide (HPAM) under UV-light irradiation, a very useful polymer in oil recovery. For comparison, Degussa P25 and as-prepared pure TiO2 were also tested under the same conditions. The enhanced photocatalytic activity was obtained on as-prepared Eu3+ (Gd3+, Pr3+)/TiO2 composites, and the reasons were explained. Finally, the degradation pathway of HPAM over the RE3+/TiO2 composite was put forward based on the intermediates produced during the photocatalysis procedure.
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