A review on recent advances of adsorption and photoreduction of Cr(VI)
Wenjun Zeng, Yidan Luo, Chongquan Wang, Zugen Liu, Mingshan Xue, Xianchuan Xie
Abstract
Hexavalent chromium (Cr(VI)) is a highly toxic environmental pollutant posing a serious threat to ecosystems and human health. In recent years, adsorption and photocatalytic reduction technologies have become effective solutions for removing Cr(VI) due to their high efficiency and low cost.This review provides a critical overview of Cr(VI) removal by adsorption and photocatalysis, with particular emphasis on their synergistic effects. The efficiency of Cr(VI) removal by adsorption and photocatalytic reduction methods is often influenced by factors such as pH, interfering ions, and the initial concentration of Cr(VI), which impacts their application in complex environments. Therefore, overcoming the challenges in practical operations remains an issue. This review discusses the application of different materials in Cr(VI) removal with a focus on their adsorption and photocatalytic reduction mechanisms. It also analyzes the effects of material properties and external environments on Cr(VI) removal and suggests directions for optimizing material performance. By further improving the selectivity, stability, and synergistic effects of adsorption and photoreduction of materials, future research is expected to design more efficient and economical Cr(VI) removal materials and facilitate their wide applications in practical environments.