Abstract Ag2CO3 anchored on BiOI/CoFe2O4 composites with p-n-p heterojunctions were synthesized by means of a facile modified deposition-precipitation method and were utilized to explore their activities for toxic elemental mercury (Hg0) removal under fluorescent light (FSL) irradiation. The obtained samples were characterized via N2 adsorption-desorption, XRD, VSM, SEM, TEM, XPS, EDS, UV–vis DRS, ESR, Transient photocurrent techniques. The Ag2CO3/BiOI/CoFe2O4 composites (AgCBi-CFO-4) with 4 wt. % of Ag2CO3 to BiOI/CoFe2O4 showed remarkably enhanced activity for Hg0 removal, which was ascribed to the combination effect of AgCBi-CFO-4 photocatalyst and FSL irradiation. Photocatalytic activity of AgCBi-CFO-4 increased by 40% and 30% in comparison with BiOI and BiOI/CoFe2O4 samples, respectively. The performance of AgCBi-CFO-4 was greatly influenced by some experimental factors such as FSL irradiation, strongly alkaline solution, CO32− ions and SO2. Due to the formation of intimate p-n-p heterojunction among p-type BiOI, n-type Ag2CO3 and p-type CoFe2O4, the ternary composites exhibited the enhanced visible-light absorbance performance and efficient separation of the charge carriers, thereby exerting a significantly positive effect on photocatalytic activity. The investigation clearly displayed that the superoxide radicals ( O2−) generated by AgCBi-CFO-4 photocatalyst were the main contributor to an efficient Hg0 removal.

中文翻译：

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Ag2CO3 锚定在具有 pnp 异质结的 BiOI/CoFe2O4 复合材料上：在荧光灯照射下对 Hg0 的光催化氧化具有高度增强的活性

摘要 通过简便的改进沉积-沉淀法合成了锚定在具有 pnp 异质结的 BiOI/CoFe2O4 复合材料上的 Ag2CO3，并利用其在荧光 (FSL) 照射下探索其去除有毒元素汞 (Hg0) 的活性。所得样品通过 N2 吸附-解吸、XRD、VSM、SEM、TEM、XPS、EDS、UV-vis DRS、ESR、瞬态光电流技术进行表征。Ag2CO3/BiOI/CoFe2O4 复合材料 (AgCBi-CFO-4) 与 4 wt. Ag2CO3 对 BiOI/CoFe2O4 的百分比显示出显着增强的 Hg0 去除活性，这归因于 AgCBi-CFO-4 光催化剂和 FSL 照射的组合效应。与 BiOI 和 BiOI/CoFe2O4 样品相比，AgCBi-CFO-4 的光催化活性分别提高了 40% 和 30%。AgCBi-CFO-4 的性能受 FSL 辐照、强碱性溶液、CO32− 离子和 SO2 等一些实验因素的影响很大。由于 p 型 BiOI、n 型 Ag2CO3 和 p 型 CoFe2O4 之间形成紧密的 pnp 异质结，三元复合材料表现出增强的可见光吸收性能和电荷载流子的有效分离，从而对光催化活性。研究清楚地表明，AgCBi-CFO-4 光催化剂产生的超氧自由基 (O2-) 是有效去除 Hg0 的主要贡献者。三元复合材料表现出增强的可见光吸收性能和电荷载流子的有效分离，从而对光催化活性产生显着的积极影响。研究清楚地表明，AgCBi-CFO-4 光催化剂产生的超氧自由基 (O2-) 是有效去除 Hg0 的主要贡献者。三元复合材料表现出增强的可见光吸收性能和电荷载流子的有效分离，从而对光催化活性产生显着的积极影响。研究清楚地表明，AgCBi-CFO-4 光催化剂产生的超氧自由基 (O2-) 是有效去除 Hg0 的主要贡献者。