School of Chemical Engineering, School of Environmental Science and Engineering, Guangdong Provincial Key Laboratory of Petrochemical Pollution Process and Control, Guangdong University of Petrochemical Technology, Maoming 525000, Guangdong, China.
School of Environmental Science and Engineering, Key Laboratory of Estuarine Ecological Security and Environmental Health, Xiamen University Tan Kah Kee College, Zhangzhou 363105, Fujian, China.
Sci Total Environ. 2021 Nov 20;796:148941. doi: 10.1016/j.scitotenv.2021.148941. Epub 2021 Jul 15.
Most of the reduction processes for Cr (VI) removal tend to be available only at the acidic condition and the capable extent of pH is limited. Here, we developed a facile strategy for constructing CuS/TiO architectures via a facile precipitation process. The as-prepared urchin-like CuS microspheres possessed hierarchical/large porous structure and unique electrical structure, which provided a strong ability to capture the Cr(VI) ions in water. Once CuS microspheres were combined with TiO crystals (P25), a surprised high removal efficiency for Cr(VI) was obtained. With optimal molar ratio of CuS:TiO (0.72:1), 4.4 and 1.3 times in Cr(VI) removal rate were obtained with respect to pure TiO and CuS. The high removal efficiency was induced by the distinct synergistic role of strong adsorption and photocatalytic reduction originated from unique electrical structure in CuS/TiO hetero-structure. Moreover, these novel CuS/TiO architectures possess promising application for Cr effluents remediation in a wide range of pH and with co-existing anions and cations.
大多数用于去除 Cr(VI)的还原过程往往仅在酸性条件下可用，并且 pH 值的适用范围有限。在这里，我们通过一种简单的沉淀法开发了一种构建 CuS/TiO 结构的简便策略。所制备的具有分级/大孔结构和独特的电结构的刺猬状 CuS 微球提供了在水中捕获 Cr(VI)离子的强大能力。一旦 CuS 微球与 TiO 晶体（P25）结合，就获得了对 Cr(VI)的惊人高去除效率。在 CuS:TiO 的最佳摩尔比为 0.72:1 时，与纯 TiO 和 CuS 相比，Cr(VI)的去除率分别提高了 4.4 和 1.3 倍。这种高去除效率归因于 CuS/TiO 异质结构中独特的电结构所产生的强吸附和光催化还原的明显协同作用。此外，这些新型 CuS/TiO 结构具有在广泛的 pH 值范围内以及共存阴离子和阳离子的情况下修复 Cr 废水的应用前景。
