Facile fabrication of Fe-BDC/Fe-2MI heterojunction with boosted photocatalytic activity for Cr(VI) reduction
Facile fabrication of Fe-BDC/Fe-2MI heterojunction with boosted photocatalytic activity for Cr(VI) reduction
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轻松制备 Fe-BDC/Fe-2MI 异质结，提高 Cr(VI) 还原光催化活性
DOI：
10.1016/j.jece.2021.105961
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发表时间：
2021-10
影响因子：
7.7
通讯作者：
Ma Shengqian
中科院分区：
文献类型：
--
作者：
He Qin;Fu Yangjie;Ge Xueying;Al-Enizi Abdullah M.;Nafady Ayman;Wang Qi;Ma Shengqian
采用溶剂热法制备了新型的Fe-BDC/Fe-2 MI异质结（H2 BDC：对苯二甲酸，2 MI：2-甲基咪唑）。本文采用混合配体（H2 BDC和2 MI）与Fe（III）形成配合物。有趣的是，2 MI的存在可以调节Fe-BDC的结构。在Fe-BDC/Fe-2 MI复合材料中观察到纺锤形MIL-88 B（Fe），而在裸Fe-BDC中鉴定到MIL-53（Fe）。采用光电化学表征，Fe-BDC/Fe-2 MI被优化为Fe（III）：H2 BDC：2 MI的初始摩尔比为1：0.5：10，与单独的Fe-BDC和Fe-2 MI相比，其表现出最高的光电流响应、最低的电荷转移电阻和最快的表面反应动力学。由于异质结的形成，这导致有益的光电化学性能，所制备的样品表现出增强的光催化活性的Cr（VI）还原。Fe-BDC/Fe-2 MI的计算准一级速率常数（k）为0.046 min-1，分别是Fe-BDC（0.003 min-1）和Fe-2 MI（0.007 min-1）的15.3倍和6.6倍。此外，优化的Fe-BDC/Fe-2 MI表现出上级性能，在4次循环运行后活性损失可忽略不计。
Novel Fe-BDC/Fe-2MI heterojunction (H2BDC: terephthalic acid, 2MI: 2-methylimidazole) was prepared via a one-pot solvothermal method. Herein, mixed ligands (H2BDC and 2MI) was applied to form complex with Fe(III). Interestingly, the presence of 2MI can regulate the structure of Fe-BDC. Spindle-like MIL-88B(Fe) was observed in Fe-BDC/Fe-2MI composite, while MIL-53(Fe) was identified in naked Fe-BDC. By employing photoelectrochemical characterizations, Fe-BDC/Fe-2MI was optimized at an initial molar ratio of 1:0.5:10 for Fe(III):H2BDC:2MI, which exhibited the highest photocurrent response, lowest charge transfer resistance, and fastest surface reaction kinetics as compared to the individual Fe-BDC and Fe-2MI. Due to the formation of the heterojunction which lead to beneficial photoelectrochemical properties, the as-prepared samples exhibited boosted photocatalytic activity for Cr(VI) reduction. The calculated pseudo-first-order rate constant (k) was 0.046 min−1for Fe-BDC/Fe-2MI, which was 15.3 and 6.6 times that of Fe-BDC (0.003 min−1) and Fe-2MI (0.007 min−1), respectively. Moreover, the optimized Fe-BDC/Fe-2MI demonstrated superior performance with negligible loss in activity after 4 cyclic runs.
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