利用离子交换策略构建AgBr/BiOBr S型异质结在可见光下将CO2高效还原为CO,Separation and Purification Technology

光催化还原CO 2被认为是解决天然气、石油、煤炭等化石能源加速利用所带来的严峻环境危机和能源危机的绝佳策略。创造性地将BiOBr中的Ag离子和Br离子用于离子交换策略，在BiOBr表面形成AgBr，构建了界面紧密接触的S型BiOBr/AgBr异质结。所得异质结的可见光利用率和CO 2转化率均显着提高。以纯水为液体环境，在可见光下测试催化剂对CO 2的还原率。所得结果表明，BA-1 从 CO 2到 CO 的转化效率在可见光下为 12.43 μ mol g -1 h -1，约为原始 BiOBr 的 3 倍。使用原位漂移研究反应过程中的中间体。基于原位漂移光谱推测CO 2降解的过程。此外，TPR、EIS和PL测量表明BA-1具有较高的太阳能利用率和较强的光生载流子转移和分离能力。该工作为制备高效的CO 2还原光催化剂提供了新的方向。

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CO2 reduction via photocatalytic is regarded as the excellent strategy to resolve the severe environmental crisis and energy crisis caused by the accelerated utilization of fossil energy like natural gas, oil, and coal. The Ag ion and the Br ion in BiOBr are creatively used in the ion exchange strategy to form AgBr on the surface of BiOBr, and an S-scheme BiOBr/AgBr heterojunction with close interface contact is constructed. The visible light utilization rate and CO2 conversion rate of the obtained heterojunction are both remarkably improved. The reduction rate of CO2 over the catalyst was tested under visible light using pure water as the liquid environment. As obtained results displayed that the transformation efficiency of BA-1 to CO from CO2 in the visible light was 12.43 μ mol g-1h-1, which is about 3 times that the pristine BiOBr. The intermediates during the reaction were studied using in situ DRIFTS. The process by which CO2 was degraded was speculated based on in situ DRIFTS spectra. In addition, TPR, EIS, and PL measurements indicate that BA-1 has a high solar utilization rate and strong photo-generated carrier transfer and separation capability. This work showed a novel direction for preparation of efficient photocatalyst for CO2 reduction.