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首页> 外文期刊>RSC Advances >Facile construction of a ZIF-67/AgCl/Ag heterojunction via chemical etching and surface ion exchange strategy for enhanced visible light driven photocatalysis
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Facile construction of a ZIF-67/AgCl/Ag heterojunction via chemical etching and surface ion exchange strategy for enhanced visible light driven photocatalysis

机译：通过化学蚀刻和表面离子交换策略，通过化学蚀刻和表面离子交换策略进行ZIF-67 / AGCL / AG异质结的构造

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It is of great importance to design and fabricate heterojunction photocatalysts to improve photocatalytic performance. In this work, a novel ZIF-67/AgCl/Ag heterojunction photocatalyst was successfully synthesized by a facile chemical etching, deposition–precipitation, light-induced reduction approach. After chemical etching by a AgNO _(3) precursor, the crystal size of ZIF-67 decreased remarkably together with the replacement of Co ~(2+) in the framework of ZIF-67 by Ag ~(+) via surface ion exchange. As a result, optical and electrochemical measurements indicated that the separation efficiency of light-induced electrons and holes obviously increased due to the formation of a ZIF-67/AgCl/Ag heterojunction and the surface plasmon resonance of Ag ~(0) . Meanwhile, the corresponding kinetic rate constant of ZIF-67/AgCl/Ag was estimated to be 0.1615 min ~(?1) , which was 17, 7.76 and 2.67 times as high as that of individual ZIF-67, AgCl and ZIF-67/AgCl, respectively. The ZIF-67/AgCl/Ag photocatalyst also exhibited good stability and reusability in the process of photodegradation. This work demonstrated a high efficiency photocatalyst for providing new sights into the preparation of a highly efficient MOF-based heterojunction photocatalyst and its potential applications in water purification.
机译：设计和制造异质结光催化剂以改善光催化性能是非常重要的。在这项工作中，通过容易化学蚀刻，沉积沉淀，光诱导的还原方法成功地合成了一种新的ZIF-67 / AGCl / Ag异质结光催化剂。通过AgNo _（3）前体化学蚀刻后，通过表面离子交换通过Ag〜（+）通过表面离子交换将ZIF-67的晶体尺寸与ZIF-67框架中的CO〜（2+）一起减少。结果，光学和电化学测量表明，由于ZIF-67 / AgCl / Ag异质结和Ag的表面等离子体共振的形成，光诱导的电子和孔的分离效率明显增加了Ag〜（0）的表面等离子体共振。同时，估计ZIF-67 / AGCl / AG的相应动力速率常数为0.1615分钟〜（α1），为17,7.76和2.67倍，高于单独的ZIF-67，AGCL和ZIF-67 / AgCl分别。 ZIF-67 / AGCl / Ag光催化剂在光降解过程中也表现出良好的稳定性和可重用性。这项工作展示了一种高效的光催化剂，用于提供新的景点，进入制备高效的基于MOF的异质结光催化剂及其在水净化中的潜在应用。

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