Performance evaluation and application of surface-molecular-imprinted polymer-modified TiO2 nanotubes for the removal of estrogenic chemicals from secondary effluents
Performance evaluation and application of surface-molecular-imprinted polymer-modified TiO2 nanotubes for the removal of estrogenic chemicals from secondary effluents
复制标题
表面分子印迹聚合物改性TiO2纳米管去除二级污水中雌激素化学物质的性能评价及应用
DOI：
10.1007/s11356-012-0983-0
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发表时间：
2013-03-01
影响因子：
5.8
通讯作者：
Mao, Kai
中科院分区：
文献类型：
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作者：
Zhang, Wenlong;Li, Yi;Mao, Kai
废水回用过程中雌激素类化合物的去除一直是人们非常关注的问题。目前的深度处理工艺对城市污水处理厂(WWTP)二级出水中雌激素类化合物的去除效率较低，这是因为存在其他对环境影响较小的污染物，这些污染物也是同时去除的。寻找高选择性和低成本的去除方法是必要的。为此，本研究首次制备了表面分子印迹聚合物修饰纳米管(S-MIP-TiO(2)NT)光催化剂，并对其进行了表征和去除废水中雌激素类污染物的实验研究。扫描电子显微镜和傅里叶变换红外光谱研究表明，纳米二氧化钛(平均直径为60 nm)成功地印迹了官能团(即羧基)。与纯钛纳米管相比，S-米普-二氧化钛纳米管对模板化合物(17β-雌二醇，E_2)的吸附选择性和光催化活性都有所提高。有趣的是，在低浓度(10 ng/L~100μg/L，二次流出物中的正常雌激素浓度)下，比高浓度(10~1,000 mg/L)的E2具有更高的吸附强度和光催化选择性。研究还发现，以S-MIP-TiO2NTS为光催化剂，可选择性、快速地去除城市污水处理厂二级出水中具有代表性的类雌激素化合物和类雌激素活性。此外，S-MIP-TiO2NT光催化剂表现出良好的再生性能。利用S-分子印迹-纳米二氧化钛纳米管进行光催化处理可有效去除城市污水处理厂二级出水中的雌激素类化合物。
The removal of estrogenic chemicals during wastewater reclamation has been a great concern. Current advanced treatment processes are inefficient for the removal of estrogenic chemicals from secondary effluents of municipal wastewater treatment plants (WWTPs) due to the coexistence of other pollutants with less environmental significance which are also removed simultaneously. The search for highly selective and low-cost removal methods is warranted. Therefore, surface-molecular-imprinted polymer-modified TiO(2) nanotube (S-MIP-TiO(2) NT) photocatalysts were fabricated, characterized, and tested for the removal of estrogenic pollutants from wastewater in this study for the first time. Scanning electron microscopy and Fourier-transform infrared spectroscopy studies showed that the TiO(2) NTs (with an average diameter of 60 nm) were successfully imprinted with functional groups (i.e., carboxyl). The adsorption selectivity and photocatalytic activity of the S-MIP-TiO(2) NTs towards template compound (17β-estradiol, E2) were improved, compared with neat TiO(2) NTs. Interestingly, S-MIP-TiO(2) NTs exhibited higher adsorption intensity and photocatalytic selectivity at low concentrations (from 10 ng/L to 100 μg/L, as normal estrogenic chemical concentrations in secondary effluents) of E2 than that at high concentrations (from 10 to 1,000 mg/L). It was also found that some representative estrogenic chemicals and estrogenic activity could be selectively and rapidly removed from secondary effluents of municipal wastewater treatment plants using S-MIP-TiO(2) NTs as photocatalysts. In addition, S-MIP-TiO(2) NT photocatalysts exhibited excellent regeneration characteristics. Photocatalytic treatment using S-MIP-TiO(2) NTs could be a promising approach for the effective removal of estrogenic chemicals from secondary effluents of municipal WWTPs.