材料科学
光催化
罗丹明B
化学工程
陶瓷膜
膜
介孔材料
渗透
涂层
水溶液
陶瓷
图层(电子)
胶体
降级(电信)
纳米技术
复合材料
催化作用
有机化学
化学
工程类
电信
生物化学
计算机科学
作者
Hamid Mahdavi,Mehran Arzani,Toraj Mohammadi
标识
DOI:10.1016/j.ceramint.2018.03.035
摘要
The main goal of the present study is synthesis, characterization and performance evaluation of an optimized photocatalytic ceramic membrane for wastewater treatment. It consists of three layers including alumina (Al2O3) macroporous support, colloidal titania (TiO2) mesoporous intermediate layer and polymeric TiO2 mesoporous top layer in order to obtain a pore gradient from the support through the top layer of membrane. The colloidal and polymeric TiO2 layers were prepared via the sol-gel method and coated using sol dip-coating approach. In order to optimize the membrane, physical separation and photocatalytic degradation capabilities of each colloidal and polymeric layer as a function of time were evaluated using Rhodamine B (RhB) aqueous solution. Thus, optimum coating number of intermediate layer and top layer were determined. Also, the performance of the optimized membrane was investigated via oily wastewater treatment using crude oil and water emulsion. Based on the performance results, two consequence colloidal layers and one polymeric layer were considered as the optimum layer number. Also, RhB photocatalytic degradation was 24.7% and RhB physical separation and permeation flux were 40.4% and 25.7 kg m−2 h−1, respectively. Furthermore, based on the oily wastewater treatment experiments, permeation flux and chemical oxygen demand (COD) rejection at the best-operating conditions (pressure of 5 bar, the temperature of 30 °C and cross flow of 600 l h−1) were 29.1 kg m−2 h−1 and 78.4%, respectively. The prepared membrane was found efficient and exhibited high industrial potential due to its multifunctional capability and thus can be employed as an advanced material for wastewater treatment applications.
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