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首页> 外文期刊>Environmental Science & Technology >Enhanced Photocatalytic Degradation and Selective Removal off Nitrophenols by Using Surface Molecular Imprinted Titania
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Enhanced Photocatalytic Degradation and Selective Removal off Nitrophenols by Using Surface Molecular Imprinted Titania

机译：通过使用表面分子印迹二氧化钛增强硝基苯酚的光催化降解和选择性去除

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Poor selectivity of titania (TiO_2) photocatalysis is unfavorable to photocatalytic removal of highly toxic low-level organic pollutants in polluted waters in the presence of other less toxic high-level pollutants. A new strategy of increasing this selectivity is the surface modification of TiO_2 via coating a thin layer of molecular imprinted polymer (MIP), which provides molecular recognition ability toward the template molecules. By using 2-nitrophenol and 4-nitrophenol as target pollutants, MIP-coated TiO_2 photocatalysts were prepared via surface molecular imprinting and were observed to have high activity and selectivity toward the photodegradation of the targets. In the presence of bisphenol A (50 mg L~(-1)) as a nontarget pollutant, the apparent rate constant forthe photodegradation of the target 2-nitrophenol and 4-nitrophenol (1.8 mg L~(-1)) over the corresponding MIP-coated TiO_2 was 10.73 × 10~(-3) and 7.06 × 10~(-3) min~(-1), being 2.46 and 4.61 times of that (4.36 × 10~(-3) and 1.53 × 10~(-3) min~(-1)) over neat TiO_2, respectively. The enhanced photocatalytic selectivity was increased when the concentration of the target was decreased and/or when the difference in both the chemical structure and molecule size between the target and nontarget molecules was increased. The increased selectivity was mainly attributed to the special interaction between the target molecules and the footprints polymer via the functional groups (-OH and -NO_2).
机译：二氧化钛（TiO_2）光催化选择性差，不利于在存在其他毒性较小的高水平污染物的情况下光催化除去污染水中的高毒性低水平有机污染物。增加这种选择性的一种新策略是通过涂覆分子印迹聚合物（MIP）的薄层对TiO_2进行表面改性，从而提供对模板分子的分子识别能力。以2-硝基苯酚和4-硝基苯酚为目标污染物，通过表面分子印迹制备了MIP包覆的TiO_2光催化剂，观察到它们对目标的光降解具有较高的活性和选择性。在双酚A（50 mg L〜（-1））作为非目标污染物的存在下，目标2-硝基苯酚和4-硝基苯酚（1.8 mg L〜（-1））在相应的光降解下的表观速率常数MIP包覆的TiO_2为10.73×10〜（-3）和7.06×10〜（-3）min〜（-1），是（4.36×10〜（-3）和1.53×10〜的2.46和4.61倍分别在纯TiO_2上的（-3）min〜（-1））。当降低靶标的浓度和/或增加靶标和非靶标分子之间的化学结构和分子大小的差异时，增强的光催化选择性增加。选择性的提高主要归因于目标分子与足迹聚合物之间通过官能团（-OH和-NO_2）的特殊相互作用。

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