Visible‐Light‐Driven BiOBr‐TiO2‐Attapulgite Photocatalyst with Excellent Photocatalytic Activity for Multiple Xanthates

作者：Yaozhong Qi, Sikai Zhao, Xiaoyu Jiang, Zhangke Kang, Shuling Gao, Wengang Liu, Yanbai Shen · 发表于：Preprints.org · 年份：2023 · DOI：10.20944/preprints202311.1110.v1 · 被引用次数：4 · 研究领域：Water Quality and Pollution Assessment、TiO2 Photocatalysis and Solar Cells、Water Quality Monitoring and Analysis

The novel ternary composites, BiOBr-TiO2-attapulgite (BTA), were synthesized using a simple hydrothermal and water-bath method, exhibiting excellent photocatalytic performance to mul-tiple xanthates. For BTA photocatalyst, TiO2 and BiOBr were uniformly loaded on the surface of acid-activated attapulgite. As a widely used collector in mining processes, sodium ethyl-xanthate (SEX) was selected as the target pollutant due to its high toxicity. The BTA ternary photocatalyst demonstrated significantly higher adsorption and photocatalytic degradation performance compared to TiO2 nanoparticles, BiOBr nanosheets, and BiOBr-TiO2 heterojunction. Structural characterization and experimental results indicated that the exceptional photocatalytic degrada-tion efficiency of BTA was mainly attributed to the formation of heterojunction between BiOBr and TiO2, as well as the presence of additional active adsorption sites provided by attapulgite. Free radical scavenging experiments and EPR results confirmed that the photogenerated holes were the predominant active species to photodegrade SEX throughout the entire experiment. The LC-MS results provided insight into potential degradation pathways of SEX. This research demonstrates that BTA, as a novel triple composite material, achieves rapid and complete degradation to 20 mg/L SEX within 20 min. This work presents a novel approach to synthesize mineral-based photo-catalysts, which have broad prospects for application in flotation wastewater trea...