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首页> 外文期刊>Current applied physics: the official journal of the Korean Physical Society >Photocatalytic inactivation of Gram-positive and Gram-negative bacteria by reactive plasma processed nanocrystalline TiO_2 powder
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Photocatalytic inactivation of Gram-positive and Gram-negative bacteria by reactive plasma processed nanocrystalline TiO_2 powder

机译：反应等离子体处理的纳米TiO_2粉体对革兰氏阳性和革兰氏阴性细菌的光催化灭活

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Nanocrystalline TiO_2 powder is synthesized using a novel reactive plasma process in which the precursor TiH_2 powder is oxidized through thermal plasma in-flight route to generate nanocrystalline TiO_2 powder. The synthesized powder consists of nano-sized TiO _2 particles, both anatase and rutile phases, in which anatase is the predominant phase. An additional feature of the plasma synthesized TiO _2 powder is the higher surface concentration of Ti~(3+) state and hydroxyl group that enhance its photocatalytic activity. The photocatalytic inactivation of Gram-positive Enterococcus and Gram-negative Klebsiella bacteria is studied using the plasma synthesized TiO_2 nanopowder with 365 nm ultraviolet (UV) light. The mechanism behind the photocatalytic disinfection of bacteria is discussed. The plasma synthesized TiO_2 nanopowder catalyst is found effective in killing Enterococcus and Klebsiella. The results corroborated that the plasma synthesized TiO_2 powder can be used for waste water treatment and water purification.
机译：纳米晶TiO_2粉末是采用新型反应性等离子体工艺合成的，其中前驱体TiH_2粉末通过热等离子体飞行中的途径被氧化生成纳米晶TiO_2粉末。合成粉末由锐钛矿相和金红石相的纳米级TiO _2颗粒组成，其中锐钛矿为主要相。等离子体合成的TiO _2粉末的另一个特点是较高的Ti〜（3+）态和羟基表面浓度，从而增强了其光催化活性。利用等离子合成的TiO_2纳米粉体在365nm紫外光下研究了革兰氏阳性肠球菌和革兰氏阴性克雷伯菌的光催化失活。对细菌进行光催化消毒的机理进行了讨论。发现等离子体合成的TiO_2纳米粉末催化剂可有效杀死肠球菌和克雷伯菌。结果证实了等离子体合成的TiO_2粉末可用于废水处理和净水。

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