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An environmental assurance system by catalytic ultrasonic irradiation with functional TiO2 particles.

采用功能性 TiO2 颗粒催化超声波照射的环境保证系统。

基本信息

批准号：
16310055
负责人：
SHIMIZU Nobuaki
金额：
$ 9.79万
依托单位：
Kanazawa University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
2004
资助国家：
日本
起止时间：
2004 至 2006
项目状态：
已结题

项目摘要

The results of this study are summarized as follows:1. The presence of TiO_2 accelerates the formation of OH raidicals during ultrasonic irradiation even in the absence of UV irradiation. The effect of TiO_2 may be due to the heterogeneous nucleation of bubbles, which enhances the cavitation power. The effect of dissolved gases on the formation of OH radicals was further studied and the power of the dissolved gases on the formation of OH radicals was in the order Xe>Ar>O_2>N_2. The degassing of the irradiation solution completely suppressed the formation of OH radicals. These results indicate that the presence of TiO_2 accelerates the formation of OH raidicals during ultrasonic irradiation even in the absence of UV irradiation and the process may be mediated through the induction of cavitation bubbles in irradiating solutions.2. Ultrasonification of bisphenol A (BPA) and pentachlorophenol (PCP), a representative endocrine disruptors, were carried out in the presence of TiO_2 and the change in the concentration of BPA and PCP were measured by HPLC/ECD. The initial concentration of BPA (1 ppm) was gradually decreased with the irradiation time and was totally decomposed by 15 minute irradiation of ultrasound. The similar results were observed for PCP.3. It was shown that the rate of disinfection obtained in the case of TiO_2 was higher than that observed in the presence of Al_2O_3, indicating a higher synergistic effect for TiO_2. The results obtained in the disinfection of E. call showed that the addition of glutathione and histidine could suppress the cell disinfection process. These results were supported by the same results obtained in the disinfection of Legionella, indicating the primary role of hydroxyl radicals in this process.The irradiation of ultrasound on TiO_2 in aqueous solution significantly generate hydroxyl radicals which is responsible for the decomposition of the hazardous materials such as endocrine disruptors and pathogenic microorganisms.

本研究的结果如下： 1．即使在没有紫外线照射的情况下，TiO_2 的存在也会在超声波照射期间加速 OH 自由基的形成。 TiO_2的作用可能是由于气泡的异质成核，增强了空化能力。进一步研究了溶解气体对OH自由基形成的影响,发现溶解气体对OH自由基形成的影响大小顺序为Xe>Ar>O_2>N_2。辐照溶液的脱气完全抑制了OH自由基的形成。这些结果表明，即使在没有紫外线照射的情况下，TiO_2的存在也加速了超声波照射过程中OH自由基的形成，并且该过程可能是通过在照射溶液中诱导空化气泡来介导的。2．在TiO_2存在下对代表性内分泌干扰物双酚A(BPA)和五氯苯酚(PCP)进行超声处理,并用HPLC/ECD测定BPA和PCP浓度的变化。 BPA的初始浓度(1 ppm)随着照射时间的延长逐渐降低，并在超声波照射15分钟后完全分解。 PCP.3 也观察到类似的结果。结果表明,TiO_2的消毒率高于Al_2O_3存在下的消毒率,表明TiO_2具有更高的协同效应。对大肠杆菌的消毒结果表明，添加谷胱甘肽和组氨酸可以抑制细胞消毒过程。这些结果得到了军团菌消毒中获得的相同结果的支持，表明羟基自由基在此过程中起主要作用。超声波照射水溶液中的TiO_2会显着产生羟基自由基，羟基自由基负责分解内分泌干扰物和病原微生物等有害物质。