Deposition, Characterization, and Enhanced Adherence of Escherichia coli Bacteria on Flame-Sprayed Photocatalytic Titania-Hydroxyapatite Coatings
Deposition, Characterization, and Enhanced Adherence of Escherichia coli Bacteria on Flame-Sprayed Photocatalytic Titania-Hydroxyapatite Coatings
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DOI：
10.1007/s11666-013-9948-1
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发表时间：
2013-06
影响因子：
3.1
通讯作者：
Yuxin Liu;Jing Huang;Siyue Ding;Yi Liu;Jianhui Yuan;Hua Li
中科院分区：
文献类型：
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作者：
Yuxin Liu;Jing Huang;Siyue Ding;Yi Liu;Jianhui Yuan;Hua Li
纳米二氧化钛作为光催化材料已经被广泛研究，并且能够杀死附着在其表面上的细菌。然而，持续的挑战是如何有效地促进细菌在其表面上的粘附以随后消灭。本文研究了液体火焰喷涂纳米二氧化钛-羟基磷灰石（HA）涂层。HA的加入减轻了涂层沉积过程中TiO 2从金红石型向金红石型的相变，使金红石型与金红石型的比例从9.58%降低到1.99%，并有效地阻止了纳米TiO 2颗粒在喷涂涂层中的聚集。大肠杆菌在涂层上的附着力与HA含量有明显的依赖性，HA含量的增加导致细菌的附着增强。通过亚甲基蓝染料在水中的分解的涂层的光催化活性的检查表明，添加HA没有显着恶化的涂层的光催化性能。涂层由10 wt.% HA表现出最好的光催化活性，这是由固定化Degussa P25涂层所表现出的。在这项研究中提供的明确的证据表明，由生物相容性HA和光催化纳米二氧化钛的组合制成的涂层具有很大的抗菌应用潜力。
Nanostructured titania has been extensively investigated as photocatalytic material and is capable of killing bacteria attached on its surface. The persistent challenge yet is how to effectively promote adhesion of bacteria on its surface for consequent extermination. The study presented here deals with liquid flame-sprayed nanostructured titania-hydroxyapatite (HA) coatings. Addition of HA alleviated phase transformation of titania from anatase to rutile during the coating deposition, reducing rutile to anatase ratio from 9.58 to 1.99%, and precluded effectively aggregation of the nano titania particles in the as-sprayed coatings. Adherence ofEscherichia colibacteria on the coatings showed significant dependence on content of HA, and the increased HA content resulted in enhanced attachment of the bacteria. Examination of the photocatalytic activity of the coatings through decomposition of methylene blue dye in water revealed that addition of HA did not markedly deteriorate the photocatalytic performances of the coatings. The coatings consisting of 10áwt.% HA showed the best photocatalytic activity, which is comparable to that exhibited by immobilized Degussa P25 coatings. The unambiguous evidence provided in this study suggests that the coatings made from combination of biocompatible HA and photocatalytic nano titania have great potential for antibacterium applications.