Facile Preparation of PVA-AA/TiO2 Composite Gel Particles and Their Tunable Photo-catalytic Property for the Degradation of Methyl Orange  

作　　者：FANG Yanhong SU Xiaoying QUAN Zhilong XIAO Congming 方艳红;SU Xiaoying;QUAN Zhilong;萧聪明(College of Material Science and Engineering, Huaqiao University)

机构地区：[1]College of Material Science and Engineering,Huaqiao University,Quanzhou 362021,China

出　　处：《Journal of Wuhan University of Technology(Materials Science)》2019年第6期1479-1483,共5页武汉理工大学学报（材料科学英文版）

基　　金：Funded by the Science&Technology Program of Fujian Province(No.2017H0018)

摘　　要：In the presence of titanium dioxide powder, cross-linking reaction between commercial polyvinyl alcohol(PVA)-based macromonomer and acrylic acid(AA) was initiated with potassium persulfate in an emulsifying system. As a result, PVA-AA/TiO2 composite gel particles were obtained. The morphology and composition of the particles were analyzed with scanning electron microscopy(SEM), energy scattering x-ray spectroscopy(EDS), Fourier infrared spectroscopy(FTIR), and thermogravimetric analysis(TGA). The analysis results confirmed that the particles were the expected ones. TiO2 was dispersed homogeneously within the spheroidal particles. Compared to the control gel, the composite gel particles not only contained Ti element but also showed higher thermal stability. In addition, the photo-catalytic behavior of the particles for the degradation of methyl orange contained in aqueous solution was examined. The particles exhibited photocatalytic characteristic for the degradation of the model dye, which could be modulated by simply varying the amount of cross-linking agent or TiO2. The photo-catalytic degradation percentage of methyl orange maintained at 91%-96% after using the particles three times, which indicated that TiO2 could played its role repeatedly via being fixated within polyvinyl alcohol-based gel.In the presence of titanium dioxide powder, cross-linking reaction between commercial polyvinyl alcohol（PVA）-based macromonomer and acrylic acid（AA） was initiated with potassium persulfate in an emulsifying system. As a result, PVA-AA/TiO2 composite gel particles were obtained. The morphology and composition of the particles were analyzed with scanning electron microscopy（SEM）, energy scattering x-ray spectroscopy（EDS）, Fourier infrared spectroscopy（FTIR）, and thermogravimetric analysis（TGA）. The analysis results confirmed that the particles were the expected ones. TiO2 was dispersed homogeneously within the spheroidal particles. Compared to the control gel, the composite gel particles not only contained Ti element but also showed higher thermal stability. In addition, the photo-catalytic behavior of the particles for the degradation of methyl orange contained in aqueous solution was examined. The particles exhibited photocatalytic characteristic for the degradation of the model dye, which could be modulated by simply varying the amount of cross-linking agent or TiO2. The photo-catalytic degradation percentage of methyl orange maintained at 91%-96% after using the particles three times, which indicated that TiO2 could played its role repeatedly via being fixated within polyvinyl alcohol-based gel.

关 键 词：titanium dioxide composite gel particles controlled preparation photo-catalytic degradation 

分 类 号：O643.36[理学—物理化学] O644.1[理学—化学] X703[环境科学与工程—环境工程]