Titanium dioxide sol–gel-coated expanded clay granules for use in photocatalytic fluidized-bed reactor
Titanium dioxide sol–gel-coated expanded clay granules for use in photocatalytic fluidized-bed reactor
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DOI：
10.1016/j.apcatb.2014.10.006
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发表时间：
2015-11
影响因子：
22.1
通讯作者：
N. Pronina;D. Klauson;A. Moiseev;J. Deubener;M. Krichevskaya
中科院分区：
文献类型：
--
作者：
N. Pronina;D. Klauson;A. Moiseev;J. Deubener;M. Krichevskaya
对用于沸腾床光催化反应器的膨化粘土颗粒表面二氧化钛涂层进行了实验研究。制备过程采用溶胶-凝胶法，采用浸渍镀膜技术。考察了两种基于原钛酸四丁酯和四异丙醇钛的溶胶-凝胶组合物以及两种商品二氧化钛溶胶。研究了前驱体二氧化钛浓度、工业上可获得的二氧化钛纳米粒子对溶胶-凝胶的改性、衬底抽拉速度和热处理条件对涂层性能的影响。通过对新型微污染物--四环素类抗生素多西环素的降解，评价了膨化粘土负载二氧化钛的光催化活性。得到了机械性能稳定、性能依赖于溶胶-凝胶工艺参数的活性涂层。多孔二氧化钛溶胶-凝胶包覆膨胀粘土的应用可以将污染物的吸附和光催化降解结合在一起。一方面，涂层改善的光催化性能与其附着力和磨损性能之间的折衷，这对沸腾床操作具有重要意义，另一方面，导致了合适的工艺参数的确定。
An experimental research into the titania coatings on granulated expanded clay to be used in fluidized-bed photocatalytic reactor was undertaken. The preparation procedures were performed via sol–gel method using dip coating techniques. Two sol–gel compositions based on tetrabutyl orthotitanate and titanium tetraisopropoxide as well as two commercial TiO2sols were examined. The impacts of titania precursor concentration, modification of sol–gel by industrially available TiO2nanoparticles, the substrate withdrawal speed and thermal treatment conditions on the coatings’ properties were studied. The photocatalytic activity of expanded clay-supported titania was evaluated by the degradation of an emerging micropollutant, tetracycline family antibiotic doxycycline. Mechanically stable and active coatings with properties dependent on sol–gel processing parameters were obtained. The application of porous titania sol–gel-coated expanded clays could combine pollutants’ adsorption and their photocatalytic degradation. The compromise between coatings’ improved photocatalytic performance, on the one hand, and their adhesion and attrition properties, significant for fluidized-bed operation, on the other hand, lead to the determination of appropriate processing parameters.