In Situ Grown AgI/Bi12O17Cl2 Heterojunction Photocatalysts for Visible Light Degradation of Sulfamethazine: Efficiency, Pathway, and Mechanism,ACS Sustainable Chemistry & Engineering

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In Situ Grown AgI/Bi12O17Cl2 Heterojunction Photocatalysts for Visible Light Degradation of Sulfamethazine: Efficiency, Pathway, and Mechanism
ACS Sustainable Chemistry & Engineering ( IF 7.1 ) Pub Date : 2018-01-17 00:00:00 , DOI: 10.1021/acssuschemeng.7b04584
Chengyun Zhou _{1,

2} , Cui Lai _{1,

2} , Piao Xu _{1,

2} , Guangming Zeng _{1,

2} , Danlian Huang _{1,

2} , Chen Zhang _{1,

2} , Min Cheng _{1,

2} , Liang Hu _{1,

2} , Jia Wan _{1,

2} , Yang Liu _{1,

2} , Weiping Xiong _{1,

2} , Yaocheng Deng _{1,

2} , Ming Wen _{1,

2}

Affiliation

Visible-light-driven photocatalysts attract great interest because they can utilize more sunlight for reactions than conventional photocatalysts. A novel visible-light-driven photocatalyst AgI/Bismuth oxychloride (Bi₁₂O₁₇Cl₂) hybrid was synthesized by a hydrothermal-precipitation method. Several characterization tools, such as X-ray powder diffraction (XRD), scanning electron microscopy (SEM), high-resolution transmission electron microscopy (HRTEM), X-ray photoelectron spectroscopy (XPS), and UV–vis diffuse reflectance spectroscopy (DRS) were employed to study the phase structures, morphologies, and optical properties of the fabricated photocatalysts. These characterizations indicated that AgI nanoparticles were evenly distributed on the surface of Bi₁₂O₁₇Cl₂, and heterostructures were formed. The photochemical characterizations demonstrated that the promoted separation of carrier transfer in the AgI/Bi₁₂O₁₇C_l2 heterojunction was achieved. The degradation rate of sulfamethazine (SMZ) by AgI/Bi₁₂O₁₇Cl₂ was about 7.8 times and 35.2 times higher than that of pristine Bi₁₂O₁₇Cl₂ and BiOCl under visible-light-driven photocatalysts, respectively. It was also found that the amount of AgI in the AgI/Bi₁₂O₁₇Cl₂ composites played an important role in photocatalytic activity, and the optimized ratio was 25%. The AgI/Bi₁₂O₁₇Cl₂ shows good catalytic stability and maintains similar reactivity after four cycles. Furthermore, the degradation intermediates of SMZ were identified by HPLC-MS, and the photocatalytic mechanism was proposed. These findings highlight the role of Bi₁₂O₁₇Cl₂ on contaminant elimination and open avenues for the rational design of highly efficient photocatalysts.

中文翻译：

原位生长的AgI / Bi ₁₂ O ₁₇ Cl ₂异质结光催化剂对可见的磺胺二甲嘧啶降解：效率，途径和机理

可见光驱动的光催化剂引起了极大的兴趣，因为与常规的光催化剂相比，它们可以利用更多的阳光进行反应。通过水热沉淀法合成了一种新型的可见光驱动的光催化剂AgI /三氧化二铋（Bi ₁₂ O ₁₇ Cl ₂）。几种表征工具，例如X射线粉末衍射（XRD），扫描电子显微镜（SEM），高分辨率透射电子显微镜（HRTEM），X射线光电子能谱（XPS）和紫外可见漫反射光谱（DRS））被用来研究所制备的光催化剂的相结构，形态和光学性质。这些特征表明AgI纳米粒子均匀地分布在Bi的表面₁₂ O ₁₇ Cl ₂，形成异质结构。光化学特征表明，在AgI / Bi ₁₂ O ₁₇ C _l2异质结中实现了载流子转移的促进分离。在可见光驱动的光催化剂下，AgI / Bi ₁₂ O ₁₇ Cl ₂的磺胺二甲嘧啶（SMZ）降解速率分别比原始Bi ₁₂ O ₁₇ Cl ₂和BiOCl分别高7.8倍和35.2倍。还发现AgI / Bi ₁₂ O ₁₇ Cl ₂中的AgI量复合材料在光催化活性中起着重要作用，最优化比例为25％。AgI / Bi ₁₂ O ₁₇ Cl ₂显示出良好的催化稳定性，并在四个循环后保持相似的反应性。此外，通过HPLC-MS鉴定了SMZ的降解中间体，并提出了光催化机理。这些发现突出了Bi ₁₂ O ₁₇ Cl ₂在污染物去除和合理设计高效光催化剂方面的作用。

更新日期：2018-01-17

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