Aqueous oxidation of dimethyl phthalate in a Fe(VI)-TiO(2)-UV reaction system.
Aqueous oxidation of dimethyl phthalate in a Fe(VI)-TiO(2)-UV reaction system.
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DOI：
10.1016/j.watres.2007.10.010
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发表时间：
2008-03
期刊：
影响因子：
12.8
通讯作者：
Baoling Yuan;Xiang-zhong Li;N. Graham
中科院分区：
文献类型：
--
作者：
Baoling Yuan;Xiang-zhong Li;N. Graham
研究了高铁酸盐-高氯酸盐组合工艺在邻苯二甲酸二甲酯水溶液降解中的应用。比较了pH = 9、有和无溶解氧（DO）时Fe（VI）-TiO_2-UV过程的行为，发现在N_2和O_2鼓泡条件下，Fe（VI）-TiO_2-UV过程的化学还原速率相似，但在有氧条件下，Fe（VI）-TiO_2-UV过程的化学还原速率显著降低。据推测，氧的存在导致形成Fe-O-（有机）络合物物种，其吸附到光催化剂的表面并使其失活。FTIR光谱表明，TiO 2表面存在吸附络合物，TiO 2对TiO 2的吸附能力降低。在典型环境DO水平（0.9mgL-1）的存在下，Fe（VI）-TiO 2-UV工艺实现了适度的DMP降解（120分钟内降解40%）。
The application of a combined ferrate–photocatalysis process for the aqueous degradation of dimethyl phthalate (DMP) has been studied. The behaviour of the Fe(VI)-TiO2-UV process at pH 9 in the presence and absence of dissolved oxygen (DO) has been compared and significant differences have been found. In comparative tests under N2and O2bubbling, the chemical reduction rate of ferrate as conduction band electron acceptor was similar, but the resulting degradation of DMP was substantially lower in the presence of oxygen. It is speculated that the presence of oxygen leads to the formation of Fe–O–(organic) complex species that adsorb to, and deactivate, the surface of the photocatalyst. The presence of surface-adsorbed complex species was indicated by FTIR spectroscopy and a reduced TiO2adsorption capacity for DMP. In the presence of typical environmental levels of DO (∼9mgL−1), the Fe(VI)-TiO2-UV process achieved a modest degree of DMP degradation (40% in 120min).