| 胡海峰,唐玉朝,凌先俊,王莹.组合光源反应条件下Ag/TiO2催化还原水中硝酸盐[J].安徽建筑大学学报,2015,23(6):63-68 |
| 组合光源反应条件下Ag/TiO2催化还原水中硝酸盐 |
| Catalytic Reduction of Nitrate by Ag/TiO2 Catalyst under the Combination of Ultra Violet |
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| DOI：10.11921/j.issn.2095-8382.20150613 |
| 中文关键词: 银掺杂 二氧化钛 光催化 还原 硝酸盐 |
| 英文关键词: Ag doping titanium dioxide photocatalysis reduction nitrate |
| 基金项目:国家水体污染控制与治理科技重大专项（2014ZX07405-003-03）；安徽省教育厅自然科学重点
项目（KJ2015A109）。 |
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| 中文摘要: |
| 用化学还原法制备Ag/TiO2催化剂，采用扫描电子显微镜对催化剂进行表征。研究了不同光源照射下Ag掺杂量、空穴清除剂、甲酸浓度、催化剂用量以及煅烧温度对硝酸根还原的影响。重点考察了365nm、308nm及254nm三种波长的紫外灯组合光源照射下硝酸根的还原反应。结果发现，Ag掺杂量为2wt.% 、甲酸浓度为30mmol/L、催化剂用量为1g/L时，采用365nm、308nm和254nm三种波长的紫外灯组合光源，硝酸根的还原效果最好。此时，硝酸盐氮的去除率为21.2%，亚硝酸盐氮浓度为零，转化的硝酸盐氮中氨氮的转化率只占12.56%，氮气的选择性为87.44%。 |
| 英文摘要: |
| Ag/TiO2 catalysts were prepared by a chemical reduction method and characterized by SEM. Effects of the Ag content, the hole scavengers, the amount of formic acid, the dosage of titanium dioxide and the calcination temperature of TiO2 have been investigated, and The reduction of nitrate in the combination of 365nm, 308nm and 254nm with three wavelength ultraviolet light was studied. The results showed that nitrate can be removed efficiently under the combination of Ultra-Violet (365nm,308nm,254nm). Best catalytic activity for photocatalytic reduction of nitrate with the presence of formic acid was obtained when the content of Ag was 2wt.%, the concentration of formic acid was 30mmol/L, the dosage of TiO2 was 1g/L. The nitrate conversion was 21.2%, no nitrite was detected, only 12.56% converted nitrate existed in ammonia form, nitrogen selectivity was 87.44%. |
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