Enhanced photocatalytic activity of BiPO4 towards the photo-degradation of Rhodamine B: Effect of precursor phosphates (Na2HPO4, KH2PO4, and NH4H2PO4) on BiPO4 structure, morphology and optical properties

Next Materials Pub Date : 2025-07-22 DOI:10.1016/j.nxmate.2025.100975

A. Bouddouch , B. Akhsassi , Y. Ettahiri , L. Mllaoiy , B. Bakiz , F. Guinneton , S. Villain , A. Benlhachemi

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Abstract

BiPO₄ was prepared by the precipitation route using three different types of phosphate salts (Na₂HPO₄, KH₂PO₄, and NH₄H₂PO₄) as starting precursor. The dissolution of each phosphate precursor used in distilled water gave a specific pH that affected the purity, morphology and optical properties of the BiPO₄ produced. BiPO₄ synthesized from Na₂HPO₄ showed the best photocatalytic activity towards the photo-degradation of Rhodamine B as a polluting dye. The effect of the precipitating agent on the structure, size and optical proprieties of the particles was confirmed by the X-ray diffraction technique, scanning electron microscopy, (BET) method, Raman analysis and Diffuse Reflectance Spectroscopy. Several organic and inorganic scavengers were used to evaluate the role of various photogenerated reactive species. The kinetic study followed the pseudo-first-order kinetic model. In addition, the proposed reaction mechanism for the degradation of Rhodamine B in the presence of the best photocatalyst was discussed.

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增强BiPO4光催化降解罗丹明B的活性：前驱磷酸盐（Na2HPO4、KH2PO4和NH4H2PO4）对BiPO4结构、形态和光学性质的影响

以Na2HPO4、KH2PO4和NH4H2PO4三种不同类型的磷酸盐为起始前驱体，采用沉淀法制备了BiPO4。每一种磷酸盐前体在蒸馏水中的溶解产生了一个特定的pH值，影响了生产的BiPO4的纯度、形态和光学性质。由Na2HPO4合成的BiPO4对罗丹明B污染染料的光催化活性最好。通过x射线衍射技术、扫描电镜、BET法、拉曼分析和漫反射光谱分析证实了沉淀剂对颗粒结构、尺寸和光学性质的影响。用几种有机和无机清除剂评价了各种光生反应物质的作用。动力学研究遵循准一级动力学模型。此外，还讨论了最佳光催化剂存在下罗丹明B降解的反应机理。

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