光催化还原重金属具有绿色、无二次污染等特点，在还原放射性U(VI)及Cr(VI)方面具有显著优势。本项目针对g-C3N4光催化剂对U(VI)、Cr(VI) 吸附性差、还原效率低等问题，以粘土矿物为基体改善g-C3N4光催化剂吸附能力，并通过水浴插层法优化g-C3N4/粘土复合材料对U(VI)、Cr(VI)的光催化还原活性，以实现g-C3N4/粘土复合光催化材料高吸附性、高还原性的功能化。通过考察粘土矿物与g-C3N4光催化剂合成的微观界面反应，优化高吸附性、高还原性g-C3N4/粘土复合光催化材料的制备工艺条件；建立光催化还原重金属U(VI)、Cr(VI)的工艺条件；阐明g-C3N4/粘土复合光催化材料还原重金属U(VI)、Cr(VI)的机理，以及探明复合光催化材料的再生机制。预期成果可为解决目前含重金属U(VI)、Cr(VI)废水处理难问题提供一定的理论依据。

Photocatalytic technology displays a big potential because of its advantages, such as green and non-second contamination, so the reduction of radioactive U(VI) and Cr (VI) by photocatalytic reduction technology possess significant advantage. At present, g-C3N4 photocatalyst has some disadvantage, such as low reduction efficiency for heavy metal and poor stability. In this project, clay minerals are used as matrix to increase adsorption of g-C3N4 photocatalyst, and the photocatalytic reduction activity will optimizing by hydrothermal intercalation, so as to realize the high adsorption and high reduction activity of g-C3N4/clay composite. The synthesis conditions of functionalized g-C3N4/clay composite will be optimizing by microcosmic interface reaction between clay minerals and g-C3N4 photocatalyst; the technological conditions of photocatalytic reduction of U(VI) and Cr(VI) were established by key factor under visible light; the mechanism of reduction of U(VI) and Cr(VI) with g-C3N4/clay composite photocatalytic material was described, and the regeneration mechanism of the composite photocatalytic materialwere also investigated. The expected results is expected to provide some theoretical basis and technical guidance of the application for U(VI) and Cr(VI) in environmental pollution purification.