Photoelectrocatalytic and photocatalytic disinfection of E-coli suspensions by titanium dioxide
Photoelectrocatalytic and photocatalytic disinfection of E-coli suspensions by titanium dioxide
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DOI：
10.1016/s0926-3373(02)00172-8
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发表时间：
2003-03-31
影响因子：
22.1
通讯作者：
Tinlin, JR
中科院分区：
文献类型：
--
作者：
Christensen, PA;Curtis, TP;Tinlin, JR
本文报道了光电催化和光催化对大肠杆菌的消毒研究。在鼓泡式光电化学反应器中，用二氧化钛电极对大肠杆菌悬浮液进行了电化学研究。“热”电极是通过氧化钛金属网制成的;“溶胶-凝胶”电极是通过在钛网上沉积一层二氧化钛凝胶然后加热制成的。循环伏安法用于进行两种电极类型的初始表征和优化。最好的“热电极”--即那些具有最高光电流的电极--是通过在空气中将钛网加热到700摄氏度来制备的。对于溶胶-凝胶电极，在600 ℃左右加热可获得最佳性能。这些电极，然后使用，在一个气体喷射反应器，消毒E。初始浓度为107个菌落形成单位（cfu）ml（-1）的大肠杆菌悬液。通过钛金属的氧化制备的膜被证明是优于溶胶-凝胶衍生的膜的上级。直接的实验比较表明，光电化学系统是更有效的比光催化消毒效果的泥浆Degussa P25二氧化钛。由于在实际系统中的TiO 2将暴露于各种物种的目标之外，我们还研究了H2 PO 4-和HCO 3-离子上测得的消毒率的影响。磷酸盐的添加会使电极和颗粒-浆料系统中毒，并且仅部分可逆。相比之下，虽然碳酸氢盐的添加影响所有三个系统，影响是可逆的。(C)2002 Elsevier Science B. V.保留所有权利。
This paper reports studies of the photoelectrocatalytic and photocatalytic disinfection of E. coli suspensions by titanium dioxide in a sparged photoelectrochemical reactor.Two types of titanium dioxide electrode have been used. 'Thermal' electrodes were made by oxidation of titanium metal mesh; 'sol-gel' electrodes were made by depositing and then heating a layer of titania gel on titanium mesh. Cyclic voltammetry was used to carry out an initial characterisation and optimisation of both electrode types. The best 'thermal electrodes'-i.e. those with the highest photocurrents-were prepared by heating titanium mesh at similar to700degreesC in air. For sol-gel derived electrodes, optimum performance was obtained by heating at similar to600degreesC. These electrodes were then used, in a gas sparged reactor, to disinfect E. coli suspensions with an initial concentration of 107 colony forming units (cfu) ml(-1). Films prepared by the oxidation of titanium metal were shown to be superior to sol-gel derived films. Direct experimental comparison demonstrates that the photoelectrochemical system is more efficient than photocatalytic disinfection effected by slurries of Degussa P25 titanium dioxide.Since in practical systems the TiO2 would be exposed to a variety of species additional to those that are targeted, we also examined the effects of H2PO4- and HCO3- ions on the measured disinfection rates. Phosphate addition poisons both the electrode and particulate-slurry systems and is only partially reversible. By contrast, although bicarbonate addition affects all three systems, the effects are reversible. (C) 2002 Elsevier Science B.V. All rights reserved.