The combination of semiconductor photocatalyst mediated photocatalytic reaction and persulfate activation is considered as a promising way to achieve efficient degradation of recalcitrant organic pollutants in water. Here, a series of Cu-doped BiO2-x nanosheets was successfully manufactured and carried out to activate peroxymonosulfate (PMS) for the removal of ciprofloxacin (CIP). Here, with the help of visible light, the optimal Cu-doped BiO2-x nanosheet (CBO-1) activating PMS for the removal of CIP has a degradation rate 4.64 times more than that of BiO2-x. Photo/electro-chemical characterizations and theoretical calculations have demonstrated that the introduction of Cu can also increase the electron density near the Fermi level, which accelerates the separation and movement of photo-generated carriers of photocatalysts, and then reduces the activation energy barrier of PMS and improves its utilization efficiency. Besides, the Cu center with poor electrons was prone to form Cu ligands with CIP for enhancing the reduction of Cu(II) to accelerate the activation of PMS. Therefore, this work proposes a thinking on synthesizing efficient semiconductor photocatalysts for activating PMS, providing a valuable reference for the efficient mineralization of recalcitrant contaminant in water.

中文翻译：

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铜掺杂氧化铋增强过氧一硫酸盐活化对环丙沙星高效光降解的作用：铜位点的关键作用、理论计算和机理见解


半导体光催化剂介导的光催化反应与过硫酸盐活化相结合被认为是实现水中顽固有机污染物有效降解的一种有前途的方法。在这里，成功制造并实施了一系列 Cu 掺杂的 BiO2-x 纳米片，以激活过氧一硫酸盐 （PMS） 以去除环丙沙星 （CIP）。在这里，在可见光的帮助下，最佳的 Cu 掺杂 BiO2-x 纳米片 （CBO-1） 激活 PMS 以去除 CIP，其降解速率是 BiO2-x 的 4.64 倍。光/电化学表征和理论计算表明，Cu 的引入还可以增加费米能级附近的电子密度，从而加速光催化剂光生载流子的分离和移动，从而降低 PMS 的活化能垒，提高其利用效率。此外，电子较差的 Cu 中心容易与 CIP 形成 Cu 配体，以增强 Cu（II） 的还原以加速 PMS 的激活。因此，本工作提出了一种合成高效半导体光催化剂以激活PMS的思路，为水中顽固污染物的高效矿化提供了有价值的参考。