污染控制技术及原理
崔宝臣,王萌,刘淑芝,陈玉琳,王晓雪.N掺杂TiO2光催化还原地下水中硝酸盐[J].环境科学学报,2010,30(8):1622-1626
N掺杂TiO2光催化还原地下水中硝酸盐
- Photocatalytic reduction of nitrate in underground water over N-doped TiO2
- 基金项目：黑龙江省教育厅基金资助项目(No.11511017);东北石油大学大学生创新性实验计划资助项目
- 作者
- 单位
- 崔宝臣
- 东北石油大学化学化工学院, 大庆 163318
- 王萌
- 东北石油大学化学化工学院, 大庆 163318
- 刘淑芝
- 东北石油大学化学化工学院, 大庆 163318
- 陈玉琳
- 东北石油大学化学化工学院, 大庆 163318
- 王晓雪
- 东北石油大学化学化工学院, 大庆 163318
- 摘要：以硫酸钛为前驱体,采用水热沉淀法制备TiO2光催化剂,采用扫描电子显微镜(SEM)、X-射线能谱(EDS)、X-射线衍射(XRD)、傅立叶红外光谱仪(FTIR)和光电子能谱仪(XPS)进行表征和分析,考察了硫酸钛浓度、焙烧温度对光催化还原水中硝酸盐活性的影响.结果表明,制备的催化剂为掺杂N的锐钛矿型TiO2.硫酸钛浓度为0.5mol·L-1、焙烧温度为400℃时制备的催化剂活性最佳,反应120min后,硝酸盐转化率为95.8%,中间产物NO--N浓度为0.17mg·mL-1,副产物NH4+-N浓度为1.52mg·mL-1.
- Abstract：A TiO2 catalyst was prepared by a hydrothermal precipitation method using titanium sulphate as the precursor.The catalyst was characterized by scanning electron microscopy(SEM),energy dispersive x-ray spectrometry(EDS),x-ray diffraction(XRD),fourier transform infrared spectroscopy(FTIR),and X-ray photoelectron spectroscopy(XPS).The influences of the concentration of titanium sulphate and calcination temperature on the photocatalytic nitrate reduction activity were investigated.The results indicated that the catalyst obtained was N-doped TiO2 with an anatase phase structure.The catalyst prepared at a calcination temperature of 400℃ and a titanium sulphate concentration of 0.5 mol·L-1 exhibited the best photocatalytic activity for nitrate reduction.The nitrate conversion was up to 95.8%,and the concentrations of the intermediate product NO-2-Nand the by-product NH4+-Nwere respectively 0.17 mg·L-1 and 1.52 mg·L-1 after reaction for 120 min.
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