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ISSN: 2157-7048

Journal of Chemical Engineering & Process Technology
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Research Article

Honeycomb Structures of TiO2-modified Hydroxyapatite Composite for Microbial Filtration Application

Naruporn Monmaturapoj*, Witoon Thepsuwan, Suda Wanakitti, Charusporn Mongkolkachit, Katanchalee Mai-ngam,
Sawinee Ngernpimai, Wattana Klinsukhon and Chureerat Prahsarn
National Metal and Materials Technology Center, 114 Thailand Science Park, Pathumthani 12120, Thailand
Corresponding Author : Naruporn Monmaturapoj
National Metal and Materials Technology Center
114 Thailand Science Park, Pathumthani 12120, Thailand
Tel: 662564 6500
E-mail: [email protected]
Received March 30, 2015; Accepted April 08, 2015; Published April 16, 2015
Citation: Monmaturapoj N, Thepsuwan W, Wanakitti S, Mongkolkachit C, Mai-ngam K et al. (2015) Honeycomb Structures of TiO2-modified Hydroxyapatite Composite for Microbial Filtration Application. J Chem Eng Process Technol 6:221. doi:10.4172/2157-7048.1000221
Copyright: © 2015 Monmaturapoj N, et al. This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.
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Abstract

Honeycomb structures of TiO2-modified hydroxyapatite composite (HA/TiO2) were fabricated using extrusion technique. The mixture formulations of HA/TiO2 extrusion pastes (S1-S4) were investigated to optimize the process. The filtering effectiveness of the HA/TiO2 honeycombs was evaluated by photocatalytic activity measurement and a bactericidal test. The effects of sintering temperature and honeycomb thickness on photocatalytic and antibacterial activities were additionally studied. The S3 and S4 honeycomb samples, sintered at 650°C, exhibited a similar trend in reducing methylene blue concentration. At 800°C, the S3 honeycomb sample showed a slightly faster reduction in methylene blue concentration compared to the S4 honeycomb. Honeycomb samples of 2 and 5 cm in thickness showed significantly greater photocatalytic activity than that of 1 cm such that methylene blue concentrations rapidly decreased after UV exposure for 24 hours. The S3 and S4 honeycomb samples also exhibited decomposition of both gram-negative E. coli and gram-positive S. aureus. Approximately 50% of gram-positive S. aureus and gramnegative E. coli were decomposed by the honeycombs in the sample-thickness dependent manner after 2 hours of UV exposure. Low survival ratios of bacteria (5% - 10%) were observed after 6 hours of UV exposure and the 2 mm and 5 mm thick honeycomb samples showed the greatest and most similar antibacterial activities.

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