Abstract

Novel fibrous silica zinc (FSZn_IS) catalyst was synthesized by in-situ hydrothermal-microwave method and the catalyst was analyzed by X-ray Diffraction (XRD), N₂ physisorption, Field emission scanning electron microscopy (FESEM), Fourier transform infrared (FTIR), UV–Vis diffuse reflectance spectroscopy (UV–Vis DRS) and photoluminescence (PL). The catalyst was employed in photocatalytic desulphurization of dibenzothiophene (DBT) in model fuel. The performance of FSZn_IS was compared with bare fibrous silica (KCC-1), commercial ZnO and fibrous silica zinc prepared by impregnation method (FSZn_IP). The photoactivity towards catalytic desulphurization of DBT is in the following order: FSZn_IS (88.9%) > FSZn_IP (62.4%) > KCC-1 (53.9%) > ZnO (44.4%). The best performance was achieved using 0.375 gL⁻¹ of FSZn_IS catalyst over 100 mgL⁻¹ DBT in model fuel. This is predominantly due to the well distribution of ZnO on KCC-1, high surface area (411.2 m² g⁻¹), high number of Si–O–Zn bonds, appropriate band gap energy (2.95 eV), and proficient charge separation. These criteria mutually encouraged effective harvesting of visible light (420 nm) and good mobility of charge carriers for enhanced visible light driven performance. A kinetics study determined by Langmuir–Hinshelwood model demonstrated that the photodesulphurization obeyed the pseudo-first-order and adsorption was the rate-limiting step.

Graphic Abstract

中文翻译：

---

增强光催化脱硫的纤维状硅锌（FSZn）复合材料的制备

摘要

采用原位水热微波法合成了新型纤维状硅锌催化剂（FSZn _IS），并通过X射线衍射（XRD），N ₂物理吸附，场发射扫描电子显微镜（FESEM），傅里叶变换红外光谱（FSEM ）对催化剂进行了分析。FTIR），UV-Vis漫反射光谱（UV-Vis DRS）和光致发光（PL）。该催化剂用于模型燃料中二苯并噻吩（DBT）的光催化脱硫。将FSZn _IS的性能与裸纤维二氧化硅（KCC-1），市售ZnO和通过浸渍法（FSZn _IP）制备的纤维二氧化硅锌进行了比较。DBT催化脱硫的光活性按以下顺序排列：FSZn _IS（88.9％）> FSZn_IP（62.4％）> KCC-1（53.9％）> ZnO（44.4％）。在模型燃料中，使用0.375 gL ^-1的FSZn _IS催化剂超过100 mgL ^-1 DBT可获得最佳性能。这主要是由于ZnO在KCC-1上分布均匀，表面积大（411.2 m ²  g ^-1），Si-O-Zn键数量大，带隙能适当（2.95 eV）和电荷分离充分。这些标准相互促进了可见光（420 nm）的有效收集和电荷载流子的良好迁移性，从而增强了可见光驱动性能。由Langmuir-Hinshelwood模型确定的动力学研究表明，光脱硫服从拟一级反应，吸附是限速步骤。

图形摘要