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具有增强活性以分解化学和微生物污染物的贵金属改性八面体锐钛矿型二氧化钛颗粒。

Noble metal-modified octahedral anatase titania particles with enhanced activity for decomposition of chemical and microbiological pollutants.

作者信息

Wei Z, Endo M, Wang K, Charbit E, Markowska-Szczupak A, Ohtani B, Kowalska E

机构信息

Institute for Catalysis, Hokkaido University, N21, W10, 001-0021 Sapporo, Japan.

Institute of Chemical and Environmental Engineering, West Pomeranian University of Technology in Szczecin, ul. Pulaskiego 10, 70-322 Szczecin, Poland.

出版信息

Chem Eng J. 2017 Jun 15;318:121-134. doi: 10.1016/j.cej.2016.05.138.

DOI:10.1016/j.cej.2016.05.138
PMID:28626359
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC5391806/
Abstract

Octahedral anatase particles (OAPs) were prepared by hydrothermal (HT) reaction of titanate nanowires (TNWs). OAPs were modified with noble metals (Au, Ag, Cu and Pt) by two photodeposition methods: in the absence and in the initial presence of oxygen in the system. Photocatalytic activities for oxidative decomposition of acetic acid and anaerobic dehydrogenation of methanol under UV/vis irradiation and for oxidation of 2-propanol under visible light irradiation were investigated. Antibacterial activities for bacteria () and fungi () were investigated in the dark and under UV irradiation and/or visible light irradiation. It was found that the kind of metal deposition significantly influenced the properties of photocatalysts obtained and thus their photocatalytic and antimicrobial activities. Modification of OAPs with metallic deposits resulted in enhanced photocatalytic activities for all tested systems. Pt-modified OAPs showed the highest activity for dehydrogenation of methanol due to their highest work function and lowest activation overpotential of hydrogen evolution. Cu-modified OAPs exhibited the highest activity for oxidative decomposition of acetic acid under UV/vis irradiation, probably due to the heterojunction between Cu oxides and TiO. On the other hand, Au-modified OAPs showed the highest photocatalytic activity under visible light irradiation due to their plasmonic properties. Bare OAPs, prepared with various durations of the HT reaction, did not have any antibacterial properties in the dark, while their activity under UV/vis irradiation was correlated with their photocatalytic activities for dehydrogenation of methanol and decomposition of acetic acid. Antimicrobial activity of modified OAPs in the dark and under visible light irradiation was the highest for Ag-modified OAPs. Under UV irradiation, Cu-modified OAPs showed the highest activity for inactivation of both bacteria and fungi.

摘要

通过钛酸盐纳米线（TNW）的水热（HT）反应制备了八面体锐钛矿颗粒（OAP）。采用两种光沉积方法用贵金属（金、银、铜和铂）对OAP进行改性：一种是在系统中无氧的情况下，另一种是在系统中初始存在氧气的情况下。研究了在紫外/可见光照射下醋酸氧化分解和甲醇厌氧脱氢以及在可见光照射下2-丙醇氧化的光催化活性。研究了在黑暗中以及在紫外照射和/或可见光照射下对细菌（）和真菌（）的抗菌活性。发现金属沉积的种类显著影响所制备光催化剂的性能，进而影响其光催化和抗菌活性。用金属沉积物对OAP进行改性导致所有测试系统的光催化活性增强。铂改性的OAP由于其最高的功函数和最低的析氢活化过电位而表现出最高的甲醇脱氢活性。铜改性的OAP在紫外/可见光照射下对醋酸氧化分解表现出最高活性，这可能是由于氧化铜与二氧化钛之间的异质结。另一方面，金改性的OAP由于其等离子体性质在可见光照射下表现出最高的光催化活性。用不同HT反应时间制备的裸OAP在黑暗中没有任何抗菌性能，而它们在紫外/可见光照射下的活性与它们对甲醇脱氢和醋酸分解的光催化活性相关。在黑暗中和可见光照射下，改性OAP的抗菌活性对银改性的OAP最高。在紫外照射下，铜改性的OAP对细菌和真菌的灭活表现出最高活性。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/da90/5391806/8d6e50a185b7/gr14.jpg
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https://cdn.ncbi.nlm.nih.gov/pmc/blobs/da90/5391806/8d6e50a185b7/gr14.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/da90/5391806/d5d2c57f432f/fx1.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/da90/5391806/64c741ad2cde/gr1.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/da90/5391806/e33377e5b262/gr2.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/da90/5391806/9b0b2da2647f/gr3.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/da90/5391806/c2c4335e8bb8/gr4.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/da90/5391806/5b9547ac6fb2/gr5.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/da90/5391806/5891c2d67287/gr6.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/da90/5391806/612fc84b1672/gr7.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/da90/5391806/878f54b208e3/gr8.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/da90/5391806/919dcf88ee07/gr9.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/da90/5391806/b57d201f4b4b/gr10.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/da90/5391806/0ad69bba477c/gr11.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/da90/5391806/d029011b4ba8/gr12.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/da90/5391806/1515ab1fb692/gr13.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/da90/5391806/8d6e50a185b7/gr14.jpg

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