Oxidation of Sulfonamides in Aqueous Solution by UV-TiO2-Fe(VI).
Oxidation of Sulfonamides in Aqueous Solution by UV-TiO2-Fe(VI).
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UV-TiO2-Fe(VI) 氧化水溶液中的磺胺类药物
DOI：
10.1155/2015/973942
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发表时间：
2015
影响因子：
--
通讯作者：
Gao N
中科院分区：
文献类型：
--
作者：
Ma Y;Zhang K;Li C;Zhang T;Gao N
以高铁酸钾为电子受体，研究了紫外光照射下磺胺类药物在TiO 2水悬浮液中的光催化降解。结果表明，Fe（VI）的稳定性对pH值有显著的依赖性，UV-TiO 2的存在明显降低了Fe（VI）的稳定性。实验表明，Fe（VI）能有效地将导带电子从TiO 2表面剥离出来。研究发现，在Fe（VI）存在下，磺胺类药物的光催化氧化反应比不存在Fe（VI）时快得多。SD，SM，和SMX浓度大大降低了89.2%，83.4%，和82.0%，分别与UV-TiO 2-Fe（VI），相比65.2%，66.0%，和71.9%，分别与Fe（VI），仅在黑暗中和71.3%，72.7%，和76.0%，分别与UV-TiO 2。溶液pH值对UV-TiO 2-Fe（VI）体系中磺胺类药物的降解有显著影响。在pH 7时，磺胺类药物降解10 min后达到最大值。采用LC-HESI-MS-MS对磺胺类药物在UV-TiO 2-Fe（VI）催化下氧化的中间产物进行了分析，结果表明，磺胺类药物在没有完全矿化的情况下，大部分转化为大分子产物。
The photocatalytic degradation of sulfonamides in aqueous TiO2 suspension under UV irradiation has been investigated using potassium ferrate as electron acceptors. The results showed that the stability of Fe(VI) is dependent on pH significantly, and the stability reduces obviously in the presence of UV-TiO2. The experiments indicated that Fe(VI) could effectively scavenge the conduction band electrons from the surface of TiO2. The photocatalytic oxidation of sulfonamides with Fe(VI) was found to be much faster than that without Fe(VI). The SD, SM, and SMX concentration was greatly reduced by 89.2%, 83.4%, and 82.0%, respectively, after 10 min with UV-TiO2-Fe(VI), comparing to 65.2%, 66.0%, and 71.9%, respectively, with Fe(VI) only in the dark and 71.3%, 72.7%, and 76.0%, respectively, with UV-TiO2. The pH value of solution significantly influenced the sulfonamides degradation in UV-TiO2-Fe(VI) system. The degradation amount of sulfonamides after 10 min was a maximum at pH 7. The intermediate products of sulfonamides oxidation by UV-TiO2-Fe(VI) were analysed by LC-HESI-MS-MS and the results suggested that a majority of sulfonamides turned into large-molecule products without complete mineralization.