Preparation and properties of hydroxyapatite/titania composite for microbial filtration application

Monmaturapoj, Naruporn; Thepsuwan, Witoon; Mai-ngam, Katanchalee; Ngernpimai, Sawinee; Klinsukhon, Wattana; Prahsarn, Chureerat

doi:10.1179/1743676114y.0000000162

Cited by 14 publications

(10 citation statements)

References 23 publications

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“…HAP is a type of calcium phosphate-based ceramic material widely used in the biomaterial field, especially in orthopaedic implants, being biocompatible and a very good substitute for bone. After assessing the antibacterial activity of the nanocomposite, [170] strong antiviral activity against H1N1 influenza A virus was observed under UV-light irradiation, with a synergic effect of HA and TiO 2 NPs that revealed optimal for HA/TiO 2 (50:50) [53]. Li et al coated a face mask for medical purposes with NPs formed of a mixture of silver nitrate and TiO 2 NPs in order to work as photocatalyst, reduce the bacteria population and to inhibit their growth on the surface, due to the presence of the exhaled moisture from breathing.…”

Section: Tio2 Nps-based Nanocomposites Designed For Disinfection Of F...mentioning

confidence: 99%

Photocatalytic TiO2-Based Nanostructured Materials for Microbial Inactivation

et al. 2020

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Pathogenic microorganisms can spread throughout the world population, as the current COVID-19 pandemic has dramatically demonstrated. In this scenario, a protection against pathogens and other microorganisms can come from the use of photoactive materials as antimicrobial agents able to hinder, or at least limit, their spreading by means of photocatalytically assisted processes activated by light—possibly sunlight—promoting the formation of reactive oxygen species (ROS) that can kill microorganisms in different matrices such as water or different surfaces without affecting human health. In this review, we focus the attention on TiO2 nanoparticle-based antimicrobial materials, intending to provide an overview of the most promising synthetic techniques, toward possible large-scale production, critically review the capability of such materials to promote pathogen (i.e., bacteria, virus, and fungi) inactivation, and, finally, take a look at selected technological applications.

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Section: Tio2 Nps-based Nanocomposites Designed For Disinfection Of F...mentioning

confidence: 99%

Photocatalytic TiO2-Based Nanostructured Materials for Microbial Inactivation

et al. 2020

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“…Several investigations have remarked upon the improved performance of photocatalysis profiles by the combination and/or dispersion of TiO 2 with HAp. The enhanced performance was influenced by the coating effect of HAp and the supporting adsorption capability involved in the photocatalysis mechanism [20][21][22][23]. Based on our previous research into the preparation of HAp from biogenic CaO and other investigations of the photocatalytic activity of nano TiO 2 [4,18], this research aims to investigate the preparation of HApnano TiO 2 composite for dye photodegradation applications.…”

Section: Introductionmentioning

confidence: 99%

Functionalization of hydroxyapatite derived from cockle (Anadara granosa) shells into hydroxyapatite–nano TiO2 for photocatalytic degradation of methyl violet

Fatimah

Fahrani

Harmawantika

et al. 2019

Sustain Environ Res

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Photocatalyst of hydroxyapatite-nano TiO 2 (HAp-nTiO 2) was prepared from phosphatation of calcined cockle (Anadara granosa) shells followed by dispersion of nano TiO 2 powder into HAp precipitate and calcination at 400°C for 2 h. The prepared material was characterized using X-ray diffraction, scanning electron microscope-energy dispersive X-ray spectrophotometry, gas sorption analysis, and UV-Vis diffuse reflectance spectrophotometry. The photocatalytic activity of the material was evaluated for methyl violet degradation over photocatalysis and photooxidation mechanism. The results showed that the homogeneous dispersion of TiO 2 in the HAp-nTiO 2 composite was achieved, as seen in the X-ray diffraction analysis, diffuse reflectance UV-Vis, and gas sorption analyses. The physicochemical and photocatalytic character of the composite exhibited the positive role of HAp as TiO 2 support in enhancing the photocatalytic activity with a higher turnover number and reusability property than that of pure TiO 2. It was also noted that the HAp-nTiO 2 composite demonstrated rapid methyl violet degradation over photooxidation rather than by photocatalytic mechanism.

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“…A photocatalytic decomposition reaction of our HA/TiO 2 has been previously reported to be applicable to deactivate microorganisms under weak UV light [20]. In this study, the in vitro antibacterial activities of the S3 and S4 HA/TiO 2 honeycombs of different thicknesses under room ambience with UV light were investigated.…”

Section: Antibacterial Activitymentioning

confidence: 99%

“…In the coating, particles can either deposit onto the fibers' surfaces or penetrate into the inter-fiber space which may not be fully exposed to UV light. The latter could lead to a decrease in photocatalytic activity [20]. By forming HA/TiO 2 composites into porous structures, which provide higher surface area and increase exposure area to UV light, it is possible to increase photocatalytic efficiency.…”

Section: Introductionmentioning

confidence: 99%

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

Monmaturapoj¹

2015

J Chem Eng Process Technol

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Honeycomb structures of TiO 2 -modified hydroxyapatite composite (HA/TiO 2 ) were fabricated using extrusion technique. The mixture formulations of HA/TiO 2 extrusion pastes (S1-S4) were investigated to optimize the process. The filtering effectiveness of the HA/TiO 2 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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Preparation and properties of hydroxyapatite/titania composite for microbial filtration application

Cited by 14 publications

References 23 publications

Photocatalytic TiO2-Based Nanostructured Materials for Microbial Inactivation

Photocatalytic TiO2-Based Nanostructured Materials for Microbial Inactivation

Functionalization of hydroxyapatite derived from cockle (Anadara granosa) shells into hydroxyapatite–nano TiO2 for photocatalytic degradation of methyl violet

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

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