Visible light inactivation of bacteria and fungi by modified titanium dioxide
Visible light inactivation of bacteria and fungi by modified titanium dioxide
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DOI：
10.1039/b617043a
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发表时间：
2007-06-01
影响因子：
3.1
通讯作者：
Macyk, Wojciech
中科院分区：
文献类型：
--
作者：
Mitoraj, Dariusz;Janczyk, Agnieszka;Macyk, Wojciech
测试了可见光诱导的细菌（大肠杆菌、金黄色葡萄球菌、粪肠球菌）和真菌（白色念珠菌、黑曲霉）的光催化失活。将掺杂碳的二氧化钛和氯化铂络合物修饰的TiO2作为悬浮液或固定在塑料板表面。在两种光催化剂存在的情况下，在可见光照射下观察到大肠杆菌的生物杀灭效果。在没有光的情况下，铂（iv）修饰的二氧化钛表现出较高的失活效果。简要讨论了可见光诱导光失活的机理。所观察到的光催化剂对各种微生物群的有害作用顺序依次递减：大肠杆菌>金黄色葡萄球菌>>白色念珠菌接近黑曲霉。这个序列很可能是由于这些微生物细胞壁或细胞膜结构的差异造成的，与过氧化氢酶产生的能力无关。
Visible light induced photocatalytic inactivation of bacteria (Escherichia coli, Staphylococcus aureus, Enterococcus faecalis) and fungi (Candida albicans, Aspergillus niger) was tested. Carbon-doped titanium dioxide and TiO2 modified with platinum(iv) chloride complexes were used as suspension or immobilised at the surface of plastic plates. A biocidal effect was observed under visible light irradiation in the case of E coli in the presence of both photocatalysts. The platinum(iv) modified titania exhibited a higher inactivation effect, also in the absence of light. The mechanism of visible light induced photoinactivation is briefly discussed. The observed detrimental effect of photocatalysts on various microorganism groups decreases in the order: E coli > S. aureus approximate to E. faeealis >> C. albicans approximate to A. niger. This sequence results most probably from differences in cell wall or cell membrane structures in these microorganisms and is not related to the ability of catalase production.