| 胡海峰,唐玉朝.Ag掺杂TiO2光催化还原地下水中硝酸盐[J].安徽建筑大学学报,2015,23(): |
| Ag掺杂TiO2光催化还原地下水中硝酸盐 |
| Photocatalytic reduction of nitrate in underground water by Ag/TiO2 Catalyst |
| 投稿时间：2015-05-20 修订日期：2015-11-16 |
| DOI： |
| 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）。 |
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| 中文摘要: |
| 采用化学还原法制备Ag/TiO2催化剂进行光催化还原地下水中硝酸根实验,考察了光源、掺银量、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。结果发现,在365nm、308nm及254nm三种波长的紫外灯组合光照射下,选用以500℃煅烧2h 的TiO2制备的掺银量为2% Ag/TiO2催化剂、甲酸浓度为30mmol/L、催化剂用量为1g/L时,硝酸根的效果最好。此时,硝酸盐氮的去除率为21.2%,亚硝酸盐氮浓度为零,转化的硝酸盐氮中转化为氨氮的只占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 used for photocatalytic reduction of nitrate in underground water,the effects of wavelength,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. The results of experiments showed that under the combination of UV(365nm,308nm,254nm),the best catalytic activity for photocatalytic reduction of nitrate was obtained using formic acid as hole scavenger.The content of Ag was 2%, the concentration of formic acid was 30mmol/L,the dosage of TiO2 was 1g/L.The best catalytic performance: a nitrate conversion of 21.2% and selectivity for nitrogen of 87.44%. |
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