Polystyrene beads photocatalysts drifting in water by small perturbation and their application to photokilling of Lactobacillus casei

IF 4.1 3区化学 Q2 CHEMISTRY, PHYSICAL

Journal of Photochemistry and Photobiology A-chemistry Pub Date : 2025-03-28 DOI:10.1016/j.jphotochem.2025.116417

Manabu Kiguchi, Zhongping Liang, Mei Ma, Akira Fujishima, Nobuhiro Hanada

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Abstract

Beads type photocatalysts drifting in water by small perturbation were investigated using polystyrene (PS) as a support material and air/water flow as stirring method. The sub-mm PS beads were covered with SiO₂ and TiO₂ in sequence. The obtained photocatalysts could be easily separated from water with a stainless steel wire mesh. Uniform distribution of the photocatalysts in water was achieved by stirring with air/water flow. The removal of methylene blue (MB) from aqueous solution was investigated with the PS beads photocatalysts to test their photocatalytic efficiencies. The reaction rate of the photocatalysts with a catalysts concentration of 0.25 % was close to that of 25 ppm TiO₂ nano particles (P25). We then evaluated the photokilling of Gram-positive bacteria, Lactobacillus casei with the photocatalysts. The number of bacterial cells decreased exponentially with the UV irradiation time exhibiting a single step kinetics. The photokilling effect was observed for UV light (365 nm) alone, meanwhile the effect of light irradiation was more pronounced with the catalyst. The bacteria were completely killed by UV irradiation for 60 min with the photocatalysts.

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聚苯乙烯微扰悬浮光催化剂及其在干酪乳杆菌光杀灭中的应用

以聚苯乙烯（PS）为载体，以空气/水为搅拌方式，研究了微扰作用下微球型光催化剂在水中的漂移。在亚mm级PS珠上依次覆盖SiO2和TiO2。所制备的光催化剂可以用不锈钢丝网很容易地与水分离。通过空气/水流搅拌，实现了光催化剂在水中的均匀分布。研究了PS珠光催化剂对水溶液中亚甲基蓝（MB）的去除效果。当催化剂浓度为0.25%时，光催化剂的反应速率与25 ppm TiO2纳米颗粒（P25）的反应速率接近。研究了光催化剂对革兰氏阳性菌干酪乳杆菌的光杀灭效果。细菌细胞数量随紫外线照射时间呈指数递减，呈现单步动力学。在365 nm紫外光下观察到光杀灭效果，而在催化剂的作用下光杀灭效果更明显。在光催化剂的作用下，紫外照射60 min，细菌被完全杀死。

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来源期刊

Journal of Photochemistry and Photobiology A-chemistry 化学-物理化学

CiteScore

7.90

自引率

7.00%

发文量

580

审稿时长

48 days

期刊介绍： JPPA publishes the results of fundamental studies on all aspects of chemical phenomena induced by interactions between light and molecules/matter of all kinds. All systems capable of being described at the molecular or integrated multimolecular level are appropriate for the journal. This includes all molecular chemical species as well as biomolecular, supramolecular, polymer and other macromolecular systems, as well as solid state photochemistry. In addition, the journal publishes studies of semiconductor and other photoactive organic and inorganic materials, photocatalysis (organic, inorganic, supramolecular and superconductor). The scope includes condensed and gas phase photochemistry, as well as synchrotron radiation chemistry. A broad range of processes and techniques in photochemistry are covered such as light induced energy, electron and proton transfer; nonlinear photochemical behavior; mechanistic investigation of photochemical reactions and identification of the products of photochemical reactions; quantum yield determinations and measurements of rate constants for primary and secondary photochemical processes; steady-state and time-resolved emission, ultrafast spectroscopic methods, single molecule spectroscopy, time resolved X-ray diffraction, luminescence microscopy, and scattering spectroscopy applied to photochemistry. Papers in emerging and applied areas such as luminescent sensors, electroluminescence, solar energy conversion, atmospheric photochemistry, environmental remediation, and related photocatalytic chemistry are also welcome.