Double heterojunction CQDs/CeO2/BaFe12O19 magnetic separation photocatalysts: Construction, structural characterization, dye and POPs removal, and the interrelationships between magnetism and photocatalysis

Nuclear Analysis Pub Date : 2022-09-01 DOI:10.1016/j.nucana.2022.100026

Shifa Wang , Xiangyu Chen , Leiming Fang , Huajing Gao , Mengjun Han , Xiping Chen , Yuanhua Xia , Lei Xie , Hua Yang

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引用次数: 35

Abstract

This novel double heterojunction carbon quantum dots (CQDs)/CeO₂/BaFe₁₂O₁₉ magnetic separation photocatalysts (CCBFOMSPs) were successfully prepared via a polyacrylamide gel method and low temperature sintering technology combined with a hydrothermal method. The CQDs components in CCBFOMSPs were identified by neutron powder diffraction, Raman spectroscopy and X-ray photoelectron spectroscopy. The charge carriers could transfer and separation between the valence state components (CeO₂ and BaFe₁₂O₁₉) and CQDs facilely, inhibiting the recombination of electron-hole pairs significantly by Hall effect. The photocatalytic activity of CCBFOMSPs for the degradation of mixed dyes include methyl orange (MO), rhodamine B (RhB) and methylene blue (MB) and tetrabromobisphenol A (TBBPA) were remarkably improved by regulating the electromagnetic interaction between the BaFe₁₂O₁₉ contents and the photo-generated electrons. Capturing experiment showed that the active species of hole (h_VB⁺), hydroxyl radical (•OH) and superoxide radical (•O₂⁻) played dominant roles in mixed dyes degradation. Attractively, the effect shed new light on wide applications of the double heterojunction magnetic separation photocatalysts.

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双异质结CQDs/CeO2/BaFe12O19磁分离光催化剂:构建、结构表征、染料和POPs去除，以及磁和光催化的相互关系

采用聚丙烯酰胺凝胶法和低温烧结技术结合水热法制备了新型双异质结碳量子点/CeO2/BaFe12O19磁分离光催化剂(ccbfomsp)。利用中子粉末衍射、拉曼光谱和x射线光电子能谱对ccbfomsp中的CQDs组分进行了鉴定。电荷载流子可以在价态组分(CeO2和BaFe12O19)和CQDs之间方便地转移和分离，通过霍尔效应显著抑制电子-空穴对的复合。通过调节BaFe12O19含量与光生电子之间的电磁相互作用，ccbfomsp对甲基橙(MO)、罗丹明B (RhB)、亚甲基蓝(MB)和四溴双酚A (TBBPA)等混合染料的光催化活性显著提高。捕获实验表明，空穴活性物质(hVB+)、羟基自由基(•OH)和超氧自由基(•O2−)在混合染料降解过程中起主导作用。该结果为双异质结磁分离光催化剂的广泛应用提供了新的思路。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Nuclear Analysis

CiteScore

1.70

自引率

0.00%

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