Facile Preparation of PVA-AA/TiO2 Composite Gel Particles and Their Tunable Photo-catalytic Property for the Degradation of Methyl Orange
来源期刊：Journal Of Wuhan University Of Technology Materials Science Edition2019年第6期
论文作者：方艳红 SU Xiaoying QUAN Zhilong 萧聪明
文章页码：1479 - 1483
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.
方艳红，SU Xiaoying，QUAN Zhilong，萧聪明
College of Material Science and Engineering, Huaqiao University
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.
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