A Floating Porous Crystalline TiO2 Ceramic with Enhanced Photocatalytic Performance for Wastewater Decontamination
A Floating Porous Crystalline TiO2 Ceramic with Enhanced Photocatalytic Performance for Wastewater Decontamination
复制标题
一种具有增强光催化性能的浮动多孔结晶 TiO2 陶瓷用于废水净化
DOI：
10.1002/ejic.201201494
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发表时间：
2013-05-01
影响因子：
2.3
通讯作者：
Fu, Honggang
中科院分区：
文献类型：
--
作者：
Xing, Zipeng;Li, Jiazhe;Fu, Honggang
以乙二胺改性的Degussa P25为前驱体，采用冷冻浇铸法和高温煅烧法制备了多孔性的TiO 2漂浮型光催化剂。采用XRD、SEM、TEM等手段对陶瓷进行了表征。结果表明，乙二胺保护剂可以抑制煅烧过程中不期望的二氧化钛晶粒生长和相变。陶瓷的孔隙率和抗压强度随烧结温度而变化;最佳烧结温度800 °C产生高孔隙率、高抗压强度和高光催化活性。该陶瓷对罗丹明B（10 mg L-1）的光降解表现出良好的光催化活性，5 h后总有机碳去除率高达96. 7%。光催化降解罗丹明B的动力学符合准一级动力学。陶瓷是可回收的，并且在六个循环之后没有观察到明显的变化。此外，该陶瓷还对苯酚、硫代苯威、莠去津和辛烷具有活性。因此，这种新型的漂浮光催化剂将可能具有广泛的应用，包括从废水中去除可溶性有机污染物或从废水表面去除油污染物。
A highly porous TiO2 ceramic floating photocatalyst was successfully synthesized by using ethanediamine-modified Degussa P25 as precursor, followed by a camphene-based freeze-casting process and high-temperature calcination. The ceramics were characterized in detail by XRD, SEM, and TEM. The results indicate that an ethanediamine protector can inhibit undesirable titania grain growth and phase transformation during calcination. The porosity and compressive strength of the ceramics varies with sintering temperatures; the optimal sintering temperature, 800 °C, produces high porosity, high compressive strength, and high photocatalytic activity. The ceramics exhibit good photocatalytic activity for the photodegradation of rhodamine B (10 mg L–1), and the total organic carbon removal efficiency is up to 96.7 % after 5 h. The photocatalytic kinetics of rhodamine B removal are pseudo-first order. The ceramics are recyclable, and no clear changes are observed after six cycles. Furthermore, the ceramics are also active in phenol, thiobencarb, atrazine, and octane. Therefore, this novel floating photocatalyst will likely have wide applications, including the removal of soluble organic pollutants from wastewater or the removal of oil pollutants from wastewater surfaces.