Photodegradation of 2-mercaptobenzothiazole in the γ-Fe2O3/oxalate suspension under UVA light irradiation
- 作者：Xugang Wang ; Chengshuai Liu ; Xiaomin Li ; Fangbai Li ; Shungui Zhou
- 关键词：Photodegradation ; Maghemite ; Oxalate ; 2-Mercaptobenzothiazole ; Photo-Fenton
- 刊名：Journal of Hazardous Materials
- 出版年：2008
- 期刊代码：50_03043894
- 类别：ce
- 出版时间：1 May 2008
- 卷：153
- 期：1-2
- 页码：426-433
- 文件大小：770 K
摘要
The aim of this study is to investigate the effect of various factors on the photodegradation of organic pollutants in natural environment with co-existence of iron oxides and oxalic acid. 2-Mercaptobenzothiazole (MBT) was selected as a model pollutant, while γ-Fe2O3 was selected as iron oxide. The crystal structure and morphology of the prepared γ-Fe2O3 was determined by X-ray diffractograms (XRD) and scanning electron microscopy (SEM), respectively. The specific surface area was 14.36 m2/g by Brunauer–Emmett–Teller (BET) method. The adsorption behavior of γ-Fe2O3 was evaluated by Langmuir model. The effect of the dosage of iron oxide, initial concentration of oxalic acid (pan class="inlMMLBox">
pan>), initial pH value, the light intensity and additional transition metal cations on MBT photodegradation was investigated in the γ-Fe2O3/oxalate suspension under UVA light irradiation. The optimal γ-Fe2O3 dosage was 0.4 g/L and the optimal pan class="inlMMLBox">
pan> was 0.8 mM with the UVA light intensity of 1800 mW/cm2. And the optimal dosage of γ-Fe2O3 and pan class="inlMMLBox">
pan> for MBT degradation also depended strongly on the light intensity. The optimal γ-Fe2O3 dosage was 0.1, 0.25 and 0.4 g/L, and the optimal pan class="inlMMLBox">
pan> was 1.0, 0.8, and 0.8 mM with the light intensity of 600, 1200 and 1800 mW/cm2, respectively. The optimal initial pH value was at 3.0. The additional transition metal cations including Cu2+, Ni2+ or Mn2+ could significantly accelerate MBT degradation. This investigation will give a new insight to understanding the MBT photodegradation in natural environment.