Online Quantification of O-2(center dot-) and H2O2 and Their Formation Kinetics in Ultraviolet (UV)-Irradiated Nano-TiO2 Suspensions by Continuous Flow Chemiluminescence
文献类型：期刊论文
| 作者 | Wang Dabin; Zhao Lixia; Guo Lianghong; Zhang Hui; Wan Bin; Yang Yu |
| 刊名 | ACTA CHIMICA SINICA
 |
| 出版日期 | 2015-05-15 |
| 卷号 | 73期号:5页码:388-394 |
| 关键词 | continuous flow chemiluminescence TiO2 photocatalysis O-2(center dot-) H2O2 on-line quantification kinetic study |
| 英文摘要 | O-2(center dot-) and H2O2, the two reactive oxygen species (ROS) produced in TiO2 photocatalytic reactions, play important roles in the photodegradation of pollutants. In this work, according to the different lifetime of O-2(center dot-) and H2O2, online quantification of O-2(center dot-) and H2O2 was successfully achieved based on the two established continuous flow chemiluminescence (CFCL) methods using luminol as the chemiluminescence probe. For O-2(center dot-), the CL intensity was detected by mixing the irradiated TiO2 suspension containing O-2(center dot-) with luminol within 10 s due to its short lifetime and poor stability, and thus the concentration of O-2(center dot-) was indirectly quantified according to the linear relationship between the CL intensity and the luminol concentration. For H2O2 detection with the luminol/K3Fe(CN)(6) system, the CL intensity was detected after the irradiated TiO2 suspension was placed in darkness for 30 min to ensure the complete disappearance of O-2(center dot-), and the concentration of H2O2 produced was directly quantified by the calibration curve between the CL intensity and H2O2 concentration. The concentration of O-2(center dot-) and H2O2 was determined approximately in the range of 7.5 similar to 30 nmol/L and 0.60 similar to 3.0 mu mol/L, and the detection limit was 1.95 nmol/L and 18.0 nmol/L respectively. Based on the proposed models of O-2(center dot-) and H2O2 formation, the kinetic process of O-2(center dot-) and H2O2 formation was studied, and both of them followed the increase of exponential decay function. By simulating the time-dependent concentration change of O-2(center dot-) and H2O2 with their kinetic formulas, the formation rate constants (k(f)) of O-2(center dot-) and H2O2 were calculated to be 0.0653 nmol.s(-1), and 15.0 nmol.s(-1) respectively. The formation rate of H2O2 was higher than that of O-2(center dot-) in the TiO2 photocatalytic reactions. This work provides us more insight into the formation process of ROS, and may help to improve the photocatalytic efficiency of TiO2 photocatalysis. |
| 研究领域[WOS] | Chemistry, Multidisciplinary |
| WOS记录号 | WOS:000357389800002 |
| 公开日期 | 2016-03-15 |
| 源URL | [http://ir.rcees.ac.cn/handle/311016/32636]  |
| 专题 | 生态环境研究中心_环境化学与生态毒理学国家重点实验室 |
| 推荐引用方式 GB/T 7714 | Wang Dabin,Zhao Lixia,Guo Lianghong,et al. Online Quantification of O-2(center dot-) and H2O2 and Their Formation Kinetics in Ultraviolet (UV)-Irradiated Nano-TiO2 Suspensions by Continuous Flow Chemiluminescence[J]. ACTA CHIMICA SINICA,2015,73(5):388-394. |
| APA | Wang Dabin,Zhao Lixia,Guo Lianghong,Zhang Hui,Wan Bin,&Yang Yu.(2015).Online Quantification of O-2(center dot-) and H2O2 and Their Formation Kinetics in Ultraviolet (UV)-Irradiated Nano-TiO2 Suspensions by Continuous Flow Chemiluminescence.ACTA CHIMICA SINICA,73(5),388-394. |
| MLA | Wang Dabin,et al."Online Quantification of O-2(center dot-) and H2O2 and Their Formation Kinetics in Ultraviolet (UV)-Irradiated Nano-TiO2 Suspensions by Continuous Flow Chemiluminescence".ACTA CHIMICA SINICA 73.5(2015):388-394. |
入库方式： OAI收割
来源：生态环境研究中心
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