In recent years, synthesis of rare earth vanadates using soft chemical routes is considered to be an exhilarating area of research with extensive applications owing to its cost-effectiveness, cleaner, and easier synthesis routes. In this work, we have prepared egg-shaped gadolinium vanadate (GdVO₄) nanoparticles using the simple route using 1-methyl imidazole as a novel stabilizing agent. Furthermore, the synthesized GdVO₄ is used as photocatalyst towards the photodegradation of various carcinogenic dyes namely methylene blue (Me-B), rhodamine-B (Rho-B), and malachite green (Ma-G) under visible light. For structural confirmation, the synthesized GdVO₄ nanoparticles were systematically analyzed using SEM, HRTEM, EDS, XRD, UV–vis DRS analysis, and electrochemical measurements, respectively. The characterization studies revealed that the presence of the pure phase of GdVO₄ nanoparticles with uniform egg-shaped particles with an average size of about 15 nm. The electrochemical studies confirmed that the ideal nature of GdVO₄ as electrode material for supercapacitor. The consequence of the photocatalyst used, reaction time and kinetic parameters, and regeneration of photocatalyst were further investigated. The UV–vis DRS spectroscopy results revealed that the absorbance maxima of the GdVO₄ have extended to all UV and visible light regions with a narrow bandgap energy of (2.2 eV) for the effective degradation of various dyes. The kinetic analysis of dyes degradation using the GdVO₄ nanoparticles agreed with the pseudo-first-order kinetics (Langmuir–Hinshelwood model), and it is obvious that the GdVO₄ photocatalyst could remove nearly Me-B (87.8%), Rho-B (89.2%), and Ma-G (96.2%), respectively.

近年来，由于其成本效益，更清洁和更容易的合成路线，使用软化学路线合成稀土钒酸盐被认为是一个令人振奋的研究领域，得到了广泛的应用。在这项工作中，我们使用1-甲基咪唑作为新型稳定剂，通过简单的方法制备了蛋形钒酸钒（GdVO ₄）纳米颗粒。此外，合成的GdVO ₄用作光催化剂，以在可见光下对多种致癌染料，即亚甲基蓝（Me-B），若丹明-B（Rho-B）和孔雀石绿（Ma-G）进行光降解。为了结构确认，合成的GdVO ₄使用SEM，HRTEM，EDS，XRD，UV-vis DRS分析和电化学测量分别对纳米颗粒进行了系统分析。表征研究表明存在纯相的GdVO ₄纳米颗粒和均匀的卵形颗粒，平均粒径约为15 nm。电化学研究证实，GdVO ₄作为超级电容器电极材料的理想性质。进一步研究了所用光催化剂的结果，反应时间和动力学参数以及光催化剂的再生。紫外可见DRS光谱结果表明，GdVO _4的最大吸光度已将其带隙能量为（2.2 eV）的窄带隙能量扩展到所有UV和可见光区域，以有效降解各种染料。使用GdVO ₄纳米颗粒进行染料降解的动力学分析与拟一级动力学（Langmuir–Hinshelwood模型）一致，并且很明显，GdVO ₄光催化剂可以去除近Me-B（87.8％），Rho-B （89.2％）和Ma-G（96.2％）。