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Abstract：
This work reports the influence of antimony substitution in a cerium molybdate lattice for improved dielectric and photocatalytic properties. For this purpose, a series of Ce2-xSbx(MoO4)3 (x = 0.00, 0.01, 0.03, 0.05, 0.07, and 0.09) were synthesized through a co-precipitation route. The as-synthesized materials were characterized for their optical properties, functional groups, chemical oxidation states, structural phases, surface properties, and dielectric characteristics using UV-Vis spectroscopy (UV-Vis), Fourier transform infrared (FTIR) and Raman spectroscopies, X-ray photoelectron spectroscopy (XPS), X-ray diffraction (XRD), Brunauer-Emmett-Teller (BET) analysis, and impedance spectroscopy, respectively. UV-Vis study showed a prominent red shift of absorption maxima and a continuous decrease in band gap (3.35 eV to 2.79 eV) by increasing the dopant concentration. The presence of Ce-O and Mo-O-Mo bonds, detected via FTIR and Raman spectroscopies, are confirmed, indicating the successful synthesis of the desired material. The monoclinic phase was dominant in all materials, and the crystallite size was decreased from 40.29 nm to 29.09 nm by increasing the Sb content. A significant increase in the dielectric constant (ε\' = 2.856 × 108, 20 Hz) and a decrease in the loss tan (tanδ = 1.647, 20 Hz) were exhibited as functions of the increasing Sb concentration. Furthermore, the photocatalytic efficiency of pristine cerium molybdate was also increased by 1.24 times against diclofenac potassium by incorporating Sb (x = 0.09) in the cerium molybdate. The photocatalytic efficiency of 85.8% was achieved within 180 min of UV light exposure at optimized conditions. The photocatalytic reaction followed pseudo-first-order kinetics with an apparent rate constant of 0.0105 min-1, and the photocatalyst was recyclable with good photocatalytic activity even after five successive runs. Overall, the as-synthesized Sb-doped cerium molybdate material has proven to be a promising candidate for charge storage devices and a sustainable photocatalyst for wastewater treatment.
摘要：
这项工作报告了钼酸铈晶格中锑取代对改善介电和光催化性能的影响。为此,通过共沉淀路线合成了一系列Ce2-xSbx（MoO4）3（x=0.00、0.01、0.03、0.05、0.07和0.09）。对合成材料的光学性能进行了表征，功能组，化学氧化态，结构阶段，表面属性,和介电特性使用紫外-可见光谱（UV-Vis），傅里叶变换红外(FTIR)和拉曼光谱,X射线光电子能谱(XPS),X射线衍射(XRD)Brunauer-Emmett-Teller(BET)分析,和阻抗谱，分别。UV-Vis研究表明，通过增加掺杂剂浓度，吸收最大值出现明显的红移，带隙持续降低（3.35eV至2.79eV）。Ce-O和Mo-O-Mo键的存在，通过FTIR和拉曼光谱检测，被确认,表明所需材料的成功合成。单斜相在所有材料中占主导地位，通过增加Sb含量，微晶尺寸从40.29nm减小到29.09nm。介电常数的显着增加（ε\'=2.856×108，20Hz）和损耗tan的降低（tanδ=1.647，20Hz）表现为Sb浓度增加的函数。此外，通过在钼酸铈中掺入Sb（x=0.09），原始钼酸铈对双氯芬酸钾的光催化效率也提高了1.24倍。在优化的条件下，在紫外线照射180分钟内实现了85.8％的光催化效率。光催化反应遵循伪一级动力学，表观速率常数为0.0105min-1，即使连续运行五次，光催化剂仍可循环使用，具有良好的光催化活性。总的来说,合成的Sb掺杂的钼酸铈材料已被证明是电荷存储装置的有希望的候选物和用于废水处理的可持续光催化剂。
