Sun D, Meng T T, Loong T H, Hwa T J
Environmental Engineering Research, School of Civil and Environmental Engineering, Nanyang Technological University, Singapore 639798.
Water Sci Technol. 2004;49(1):103-10.
A study of the characteristics of a novel photocatalyst indicated that it consisted of 17.3 nm nano size (average) TiO2 in the anatase phase and porous Fe2O3. SEM results revealed that nano size TiO2 was uniformly deposited onto the surface of Fe2O3 to form a bulk photocatalyst, as TiO2/Fe2O3. The porous TiO2/Fe2O3 catalyst had a BET surface area of 168 m2/g, which is three times higher than that of commercial TiO2. The experimental results indicated that the suspended TiO2/Fe2O3 photocatalyst in a photocatalytic oxidation (PCO) reactor was effective in removing TOC at 61.58% and color400 at 93.25% at 180 min illumination time, under 0.4 g/l catalyst loading and pH 7. Experimental results also revealed that pH at 7 and TiO2/Fe2O3 loading at 0.4 g/l was the optimum condition for removal of humic acids using a PCO reactor. Experimental results clearly indicated that the permeate flux rate of the ultrafiltration (UF) membrane was improved and the filtration membrane fouling phenomenon was reduced with the addition of TiO2/Fe2O3 photocatalysts to the UF membrane system. It was found that increasing the filtration time from 40 min to 185 min, the improvement to the permeate flux rate was from 57 to 83 L/hr x m2.
一项关于新型光催化剂特性的研究表明，它由平均粒径为17.3 nm的锐钛矿相纳米TiO₂和多孔Fe₂O₃组成。扫描电子显微镜（SEM）结果显示，纳米尺寸的TiO₂均匀沉积在Fe₂O₃表面，形成块状光催化剂TiO₂/Fe₂O₃。多孔TiO₂/Fe₂O₃催化剂的比表面积为168 m²/g，是商用TiO₂的三倍。实验结果表明，在光催化氧化（PCO）反应器中，悬浮的TiO₂/Fe₂O₃光催化剂在光照180分钟、催化剂负载量为0.4 g/l、pH值为7的条件下，对总有机碳（TOC）的去除率为61.58%，对色度400的去除率为93.25%。实验结果还表明，pH值为7且TiO₂/Fe₂O₃负载量为0.4 g/l是使用PCO反应器去除腐殖酸的最佳条件。实验结果清楚地表明，向超滤（UF）膜系统中添加TiO₂/Fe₂O₃光催化剂可提高超滤膜的通量率，并减少滤膜污染现象。研究发现，将过滤时间从40分钟增加到185分钟，通量率的提高从57 L/（hr·m²）提高到83 L/（hr·m²）。
