Finding new catalysts and improving the characteristics of existing catalysts are major research issues for boosting dye degradation efficiency. For this purpose, iron vanadates have been prepared by the solution combustion method using oxalyldihydrazide (ODH) and glycine (GLY) as fuel. The surface properties of catalysts were altered, and the degradation efficiency of methylene blue (MB) was improved, depending on the synthesis process and fuel type. When the ODH-assisted FeVO₄ has irregular morphology, the GLY-assisted FeVO₄ has 100–200-nm uniform nanoparticles with a surface area of 21.96 g/m² and it is performed as an excellent heterogeneous nanocatalyst for Fenton-like degradation of MB using H₂O₂ under sunlight. The narrow bandgap allows the adsorption of light and enhances photocatalytic activity. After the optimization of the catalyst amount, H₂O₂ concentration, and degradation time, the degradation efficiency of MB was found to be nearly 100% with high reusability. The process has a high-rate constant of 0.0304 min⁻¹ and the possible reaction mechanism has been proposed using GC–MS. The GLY-assisted FeVO₄ can be a potentially powerful and reusable heterogeneous catalyst for the other contaminants.

Graphical abstract

中文翻译：

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燃料类型对溶液燃烧法合成亚甲基蓝降解钒酸铁纳米催化剂的影响

寻找新的催化剂和改进现有催化剂的特性是提高染料降解效率的主要研究问题。为此，使用草酰二酰肼 (ODH) 和甘氨酸 (GLY) 作为燃料，通过溶液燃烧法制备了钒酸铁。根据合成工艺和燃料类型，催化剂的表面性质发生了改变，亚甲蓝 (MB) 的降解效率得到了提高。当 ODH 辅助的 FeVO ₄具有不规则形貌时，GLY 辅助的 FeVO ₄具有 100-200 nm 的均匀纳米粒子，表面积为 21.96 g/m ²并且它是一种优异的多相纳米催化剂，用于类芬顿降解MB 使用 H ₂ O ₂在阳光下。窄带隙允许吸收光并增强光催化活性。在对催化剂用量、H ₂ O ₂浓度和降解时间进行优化后，MB的降解效率接近100%，且具有较高的重复使用率。该过程具有 0.0304 min ^-1的高速率常数，并且已经使用 GC-MS 提出了可能的反应机理。GLY 辅助的 FeVO ₄可能是其他污染物的潜在强大且可重复使用的多相催化剂。

图形概要