A novel Sr2Ni(BO3)2 orthoborate with enhanced photocatalytic efficiency for dye degradation

IF 2.4 3区化学 Q2 CHEMISTRY, INORGANIC & NUCLEAR

Polyhedron Pub Date : 2025-06-26 DOI:10.1016/j.poly.2025.117656

Fatima-Ezzahra N'Faoui , Lahcen Boudad , M'hamed Taibi , Abdellah El Boukili

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Abstract

A novel orthoborate, Sr₂Ni(BO₃)₂, was synthesized using a conventional solid-state reaction as a highly efficient UV-active photocatalyst with distinct structural and optical advantages over conventional materials. Unlike typical photocatalysts, its monoclinic crystal structure and nanoneedle-like morphology (confirmed by XRD/SEM) promote enhanced surface reactivity and charge separation, while its dual bandgap (3.92 eV indirect, 4.51 eV direct) enables broad UV absorption. The photocatalytic performance of Sr₂Ni(BO₃)₂ was evaluated under UV irradiation for the degradation of crystal violet (CV) and methylene blue (MB) dyes. The material demonstrated excellent photocatalytic efficiency and near-complete degradation of dyes, with up to 99 % CV degradation within 150 min using 0.2 g of the catalyst. For MB, 96 % degradation was achieved within 5 h using 0.4 g of the catalyst. Kinetic analysis revealed a two-step process for CV degradation, driven by rapid adsorption followed by a slower degradation phase. In contrast, MB degradation followed a one-step mechanism with steady kinetics. The Langmuir-Hinshelwood model and pseudo-second-order kinetics provided the best fit for the experimental data, highlighting chemisorption as the dominant mechanism in the degradation process. These results highlight the potential of Sr₂Ni(BO₃)₂ as an efficient and versatile photocatalyst for wastewater treatment, particularly for the removal of organic dyes.

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新型Sr2Ni(BO3)2邻硼酸盐光催化降解染料的研究

采用传统固相反应合成了一种新型的邻硼酸盐Sr2Ni(BO3)2，作为一种高效的紫外光活性光催化剂，与传统材料相比具有明显的结构和光学优势。与典型的光催化剂不同，其单斜晶结构和纳米针状形貌（经XRD/SEM证实）促进了表面反应性和电荷分离，而其双带隙（3.92 eV间接带隙，4.51 eV直接带隙）使其具有广泛的紫外吸收。研究了Sr2Ni(BO3)2在紫外光照射下降解结晶紫（CV）和亚甲基蓝（MB）染料的光催化性能。该材料表现出优异的光催化效率和近乎完全的染料降解，使用0.2 g催化剂在150分钟内达到99%的CV降解。对于MB，使用0.4 g催化剂，在5 h内降解率达到96%。动力学分析揭示了CV降解的两步过程，即快速吸附和缓慢降解阶段。相比之下，MB的降解遵循一步机制，动力学稳定。Langmuir-Hinshelwood模型和拟二级动力学最符合实验数据，强调化学吸附是降解过程中的主要机制。这些结果突出了Sr2Ni(BO3)2作为一种高效和通用的光催化剂在废水处理方面的潜力，特别是在去除有机染料方面。

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来源期刊

Polyhedron 化学-晶体学

CiteScore

4.90

自引率

7.70%

发文量

515

审稿时长

2 months

期刊介绍： Polyhedron publishes original, fundamental, experimental and theoretical work of the highest quality in all the major areas of inorganic chemistry. This includes synthetic chemistry, coordination chemistry, organometallic chemistry, bioinorganic chemistry, and solid-state and materials chemistry. Papers should be significant pieces of work, and all new compounds must be appropriately characterized. The inclusion of single-crystal X-ray structural data is strongly encouraged, but papers reporting only the X-ray structure determination of a single compound will usually not be considered. Papers on solid-state or materials chemistry will be expected to have a significant molecular chemistry component (such as the synthesis and characterization of the molecular precursors and/or a systematic study of the use of different precursors or reaction conditions) or demonstrate a cutting-edge application (for example inorganic materials for energy applications). Papers dealing only with stability constants are not considered.