《学术论文写作》课程论文
题
目 The preparation of TiO2 aerogel by
ambient pressure drying and its performance of photocatalytic degradation of oily wastewater
学生姓名 教学院系 专业年级 指导教师 单 位 辅导教师 单 位
学 号
研究生学院 2013级材料化学工程
职 称
副教授
职 称
材料科学与工程学院
完成日期 2013 年 12 月 1 日
摘要
以钛酸四丁酯(TBT)为原料, 利用溶胶–凝胶法、小孔干燥和老化液浸泡工艺在常压下制备出了完整、无开裂的TiO2 气凝胶块体. 研究了小孔干燥和老化液浸泡技术对常压制备TiO2 气凝胶的影响, 研究结果表明: 小孔干燥能够降低TiO2 醇凝胶干燥过程中所受的不均匀收缩应力, 而TBT 醇溶液和TEOS 醇溶液浸泡处理, 能够增强凝胶的骨架强度, 有助于减轻凝胶在干燥过程中的收缩和开裂, 制备出完整的高性能TiO2 气凝胶块体. 基于小孔干燥和TEOS 乙醇溶液浸泡老化处理, 制备得到的高性能完整TiO2 气凝胶块体, 其密度为0.184 g/cm3, 比表面积达389.5 m2/g. 用高温煅烧后的锐钛矿相TiO2 气凝胶催化降解渤海原油污水模拟溶液, 在TiO2 气凝胶加入量为 400 mg/L 的情况下, 90 min 内对渤海原油污水的去除率最高可达91%.
关键词：TiO2 气凝胶; 常压; 小孔干燥; 老化液; 光催化; 原油降解
2
Abstract
The monolithic TiO2 aerogel was sucessfully synthesized at ambient pressure through Sol-Gel technique with TBT as the raw material and its photocatalyst property for
Method degradation of the aqueous emulsion of crude oil in the Bohai Sea was investigated. During the ambient drying process, aging liquor and pinhole drying technology were found to be critical to the properties of TiO2 aerogels. It was shown that the pinhole drying was favorable in reducing the asymmetric stress on the framework of TiO2 gel in the drying process and the TEOS-Ethanol or TBT-Ethanol solution as the aging liquor for TiO2 wet-gel could enhance the strength of TiO2 gel skeleton. Combining these effects, the cracking problem of TiO2 alcohol gel in the drying could be solved and the high-performance TiO2 aerogel monolith was eventually achieved. The most integrated TiO2 aerogel block exhibited low density (0.184 g/cm3) and high specific surface area (389.5 m2/g). By calcinations at high temperature, the TiO2 aerogels changed from amorphous to anatase structure. The photocatalytic properties of the heat-treated TiO2 aerogels were investigated via the degradation experiment for the aqueous emulsion of crude oil in the Bohai Sea. The results of photocatalytic experiments showed that the catalytic degradation rate was up to 91% with the addition of TiO2 aerogel of 400 mg/L.
Key words: TiO2 aerogel; ambient pressure; pinhole drying; ageing; photocatalystic; crude oil degradation
conclusion specialized vocabulary Objective Advantage Present tense& passive voice 3