Solar water disinfection by photocatalytic singlet oxygen production in heterogeneous medium
Solar water disinfection by photocatalytic singlet oxygen production in heterogeneous medium
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DOI：
10.1016/j.apcatb.2006.05.015
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发表时间：
2006-12-01
影响因子：
22.1
通讯作者：
Orellana, Guillermo
中科院分区：
文献类型：
--
作者：
Villen, Laura;Manjon, Francisco;Orellana, Guillermo
在较不发达国家偏远的农村地区进行水消毒造成了一些具体问题，因为业务费用必须很低，化学品不易部署，操作人员缺乏资格。因此，已考虑在家庭中使用替代广泛使用的氯化的技术。我们已经评估了用于细菌灭活的光催化过程的可行性，其使用阳光、可负担得起的0.8 m（2）复合抛物面收集器（CPC）和固定在多孔硅上的UV-可见吸收钌（II）三螯合物络合物（2 g m（-2））作为单线态分子氧发生器。我们已经测试了两个CPC原型与不同配置的光敏材料，即同轴和鳍型的效率。以2 L min（-1）的流量流动并掺入大肠杆菌或粪肠球菌的矿泉水进行光催化处理5 h（在北纬40度，360-700 nm太阳光辐射的剂量为0.6-0.8 MJ m（-2）L-1）。在这些条件下使用翅片型反应器，10（4）至10（2）CFU mL（-1）初始浓度的细菌存活率下降至约100%。1%和0.1%。coli和E.粪便，分别。无论使用何种细菌，两种光反应器设计的平均消毒率都相似（约100%）。低和高初始细菌水平分别为2 x 10（4）和2 x 10（6）CFU L-1 h（-1））。该新系统在灭活水性细菌方面与固体负载型TiO 2光催化剂相当或更好。(c)2006 Elsevier B. V.保留所有权利。
Water disinfection in isolated rural areas of less-developed countries poses specific problems since operational expenses must be low, chemicals are not easily deployable and qualification of operators is scarce. Therefore, alternative technologies to the widespread chlorination have been considered for household use. We have evaluated the viability of a photocatalytic process for bacteria inactivation with sunlight, affordable 0.8 m(2) compound parabolic collectors (CPC) and an UV-vis absorbing ruthenium (II) tris-chelate complex immobilised (2 g m(-2)) onto porous silicone as singlet molecular oxygen generator. We have tested the efficiency of two CPC prototypes with different configuration of the photosensitising material, namely, a coaxial- and a fin-type one. Mineral water flowing at 2 L min(-1) and spiked with Escherichia coli or Enterococcus faecalis was subject to the photocatalytic treatment for 5 h (a 0.6-0.8 MJ m(-2) L-1 dose of 360-700 nm sunlight radiation at 40 degrees N latitude). Using the fin-type reactor under these conditions, the bacterial survival for 10(4) to 10(2) CFU mL(-1) initial concentrations drop to ca. 1% and 0.1% for E. coli and E. faecalis, respectively. The average disinfection rates are similar with both photoreactor designs, regardless the bacteria used (ca. 2 x 10(4) and 2 x 10(6) CFU L-1 h(-1) for the low and the high initial levels of bacteria, respectively). The novel systems are comparable to or better than solid-supported TiO2 photocatalysts at inactivating waterborne bacteria. (c) 2006 Elsevier B.V. All rights reserved.