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| TiO2薄膜光催化体系中羟基自由基的水杨酸分子探针法测定 | |
| 引用本文： | 任学昌,史载锋,孔令仁,展宗城.TiO2薄膜光催化体系中羟基自由基的水杨酸分子探针法测定[J].环境科学学报,2008,28(4):705-709. |
| 作者姓名： | 任学昌 史载锋 孔令仁 展宗城 |
| 作者单位： | 1. 兰州交通大学环境与市政工程学院,兰州,730070;南京大学环境学院,污染控制与资源化研究国家重点实验室,南京,210093 2. 南京大学环境学院,污染控制与资源化研究国家重点实验室,南京,210093 3. 兰州交通大学环境与市政工程学院,兰州,730070 |
| 基金项目： | 兰州交通大学"第四批'青蓝'人才工程资助"项目(No.QL-06-04-A);甘肃省自然科学基金项目(No.3ZX062-B25-009);国家"863"项目(No.2002AA601250) |
| 摘 要： | 以水杨酸为分子探针物,以分光光度法测定了纳米TiO2薄膜光催化体系中产生的羟基自由基(·OH).结果表明,水杨酸的自然氧化程度较低,可以作为分子探针测定·OH的产生;实验中最佳的光照时间为60min;水杨酸浓度对·OH的测定影响较大,其最佳值为50 mg·L-1;pH值对·OH的测定影响较大,最佳值为6;最佳实验条件下,分析得到·OH的稳态浓度为1.68×10-14 mol·L-1. |
| 关 键 词： | TiO2薄膜 光催化 羟基自由基 水杨酸 分光光度法 |
| 文章编号： | 0253-2468(2008)04-705-05 |
| 收稿时间： | 2007/2/15 0:00:00 |
| 修稿时间： | 2007年2月15日 |
Salicylic acid as a molecular probe to determine hydroxyl free radicals in a TiO2 thin films photocatalytic system |
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| REN Xuechang,SHI Zaifeng,KONG Lingren and ZHAN Zongcheng.Salicylic acid as a molecular probe to determine hydroxyl free radicals in a TiO2 thin films photocatalytic system[J].Acta Scientiae Circumstantiae,2008,28(4):705-709. | |
| Authors: | REN Xuechang SHI Zaifeng KONG Lingren and ZHAN Zongcheng |
| Institution: | 1. School of Environmental & Municipal Engineering, Lanzhou Jiaotong University, Lanzhou 730070; 2. State Key Laboratory of Pollution Control and Resource Reuse, School of the Environment, Nanjing University, Nanjing 210093,State Key Laboratory of Pollution Control and Resource Reuse, School of the Environment, Nanjing University, Nanjing 210093,State Key Laboratory of Pollution Control and Resource Reuse, School of the Environment, Nanjing University, Nanjing 210093 and School of Environmental & Municipal Engineering, Lanzhou Jiaotong University, Lanzhou 730070 |
| Abstract: | Hydroxyl free radical production in a titanium dioxide film photocatalytic system was determined by a spectrophotometric method using salicylic acid as the molecular probe. Salicylic acid is scarcely oxidized under natural conditions, so it can serve as a probe to determine the concentration of hydroxyl radical produced during photocatalysis. The optimal illumination time was determined to be 60 min. The concentration of salicylic acid and pH greatly affected the determination of hydroxyl free radicals. The optimal concentration of salicylic acid was 50 mg·L-1 and optimal pH was 6. Under the optimal experimental conditions, the steady state concentration of hydroxyl free radical was 1.68×10-14 mol·L-1. |
| Keywords: | TiO2 thin films photocatalysis hydroxyl free radicals salicylic acid spectrophotometry |
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