Photocatalytic nitrate reduction over Pd–Cu/TiO2
Photocatalytic nitrate reduction over Pd–Cu/TiO2
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DOI：
10.1016/j.cej.2014.04.030
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发表时间：
2014-09
影响因子：
15.1
通讯作者：
O. Soares;M. Pereira;J. Órfão;J. Faria;Cláudia G. Silva
中科院分区：
文献类型：
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作者：
O. Soares;M. Pereira;J. Órfão;J. Faria;Cláudia G. Silva
在不同的反应条件下，考察了tio2负载1%Pd-1%Cu （%wt）催化剂光催化还原水中硝酸盐的效果。利用甲酸、草酸、乙醇、甲醇和腐植酸等一系列电子牺牲供体，通过空穴清除抑制半导体上的电子/空穴复合机制。此外，还讨论了H2as还原剂和CO2as缓冲剂的作用。发现光催化过程比暗催化过程对氮的选择性更强。孔洞清除剂或还原性h2o2显著提高了硝酸盐的光催化还原。以h2o2和co2分别作为还原剂和缓冲剂时，转化率完全（100%）。在所测试的孔洞清除剂中，0.08 M甲酸溶液在硝酸盐转化率（84%）和氮选择性（83%）之间表现出最佳折衷。
The extension of photocatalytic nitrate reduction in water by a 1%Pd–1%Cu (%wt) catalyst supported on TiO2was evaluated under different reaction conditions. A series of electron sacrificial donors such as formic acid, oxalic acid, ethanol, methanol, and humic acid were used for inhibiting the mechanism of electron/hole recombination on the semiconductor by hole scavenging. In addition, the roles of H2as reducing agent and CO2as buffer are also discussed. The photocatalytic process is found to be more selective towards nitrogen than the dark catalytic process. Hole scavengers, or reducing H2increase significantly the photocatalytic reduction of nitrate. Complete (100%) conversion was obtained when both H2and CO2were used as reducing and buffer agent, respectively. Among the hole scavengers tested, 0.08 M formic acid solution represents the best compromise between nitrate conversion (84%) and nitrogen selectivity (83%).