Novel direct dual Z-scheme AgBr(Ag)/MIL-101(Cr)/CuFe2O4 for efficient conversion of nitrate to nitrogen
Novel direct dual Z-scheme AgBr(Ag)/MIL-101(Cr)/CuFe2O4 for efficient conversion of nitrate to nitrogen
复制标题
新型直接双 Z 型 AgBr(Ag)/MIL-101(Cr)/CuFe2O4 可将硝酸盐有效转化为氮气
DOI：
10.1016/j.apsusc.2019.145225
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发表时间：
2020-04-01
影响因子：
6.7
通讯作者：
Huo, Mingxin
中科院分区：
文献类型：
--
作者：
Li, Zhaoyang;Zhao, Yongjie;Huo, Mingxin
近年来，光催化还原硝酸盐受到了广泛的关注，但其效率低、分离困难等问题限制了其在实际中的应用。本研究首次采用水热与光沉积相结合的方法制备了AgBr101(Cr)/CuFe2O4(AB/M/CFO)新型直接双Z结构的AgBr(Ag)/MIL-101(Cr)/CuFe2O4(AB/M/CFO)。在30min的紫外光照射下，AB/M/CFO的硝酸盐转化率和氮气选择性最高，分别为79.9%和94.5%。AB/M/CFO的双Z方案增强了电子转移和电荷分离，这被瞬时光电流响应所证实，导致光催化效率的显著提高。同时，经过4次循环后，AB/M/CFO光催化剂也表现出较强的磁分离能力和良好的循环稳定性。在自由基捕获实验的基础上，提出了双Z方案AB/M/CFO光催化材料的激发和电子转移过程。我们的工作为构建在光催化降解污染物方面具有广阔应用前景的双Z-方案MOF材料提供了一种新的策略。
Photocatalytic reduction of nitrate has attracted much attention recently, however, low efficiency and difficult separation have limited its application in practice. In this study, the novel direct dual Z-scheme AgBr(Ag)/MIL-101(Cr)/CuFe2O4 (AB/M/CFO) was fabricated by the hydrothermal technology combined with the photodeposition method for the first time. The AB/M/CFO exhibited the highest nitrate conversion and nitrogen selectivity (79.9% and 94.5%, respectively) compared to AgBr(Ag)/MIL-101(Cr), MIL-101(Cr) and CuFe2O4 for 30 min UV-light irradiation. The dual Z-scheme of AB/M/CFO enhanced electron transfer and charge separation, which was proved by transient photocurrent responses, leading to a significant improvement in photocatalytic efficiency. Meanwhile, after four cycles, the AB/M/CFO photocatalyst also displayed a strong magnetic separation ability and excellent recycling stability. Furthermore, the excitation and electron transfer process over dual Z-scheme AB/M/CFO photocatalytic material were proposed, based on the radical trapping experiments. Our work provides a new strategy to construct dual Z-scheme MOFs-based materials that have promising applications in photocatalytic reduction of pollutants.