Work

CaCO3/BiO2−x/CdS Composite with Rapid Photocatalytic Reduction of Cr(VI) Under Visible Light

Year: 2026

Type: article

Abstract: CaCO3/BiO2−x/CdS (CCO/BO/CS) ternary composite photocatalyst was synthesized via a hydrothermal method combined with chemical precipitation, and its performance in the photocatalytic reduction of hexavalent chromium (Cr(VI)) under visible light was systematically investigated. Compared with pure BiO2−x, CdS, and binary BiO2−x/CdS composites, the CCO/BO/CS system exhibited significantly enhanced Cr(VI) reduction activity. Specifically, the CCO/BO/CS (0.75:1:2 wt) composite achieved a Cr(VI) reduction efficiency of 94.53% within 30 min of visible light irradiation—approximately 94.6 times and 6.1 times higher than those of BiO2−x (1.0%) and CdS (15.52%). Photoelectrochemical and trapping experiments revealed that the enhanced performance stems from improved charge separation, accelerated interfacial electron transfer, and the promotional role of CaCO3—likely through lattice distortion—rather than direct photocatalytic participation. This study highlights the innovation of incorporating low-cost, eco-friendly calcium carbonate into semiconductor-based photocatalysts to induce lattice distortion for enhanced charge separation, as an effective strategy for improving the reduction efficiency of Cr(VI).

Source: Nanomaterials

DOI: 10.3390/nano16060376

Authors: Chao Liu, Chongxue Huang, Chaohao Hu, Dianhui Wang, Yan Zhong, Chengying Tang

Institutions: Guilin University of Electronic Technology, Hezhou University

Language: English

Topic: Advanced Photocatalysis Techniques

Subfield: Renewable Energy, Sustainability and the Environment

Field: Energy

Domain: Physical Sciences

Open Access status: gold

Estimated APC paid: $2,896

Funders: Guangxi Key Laboratory of Information Materials, National Natural Science Foundation of China