The influence of precursor solution pH on phase, morphology and optical properties of BiOIO₃ was investigated in this research. The products were synthesized in the solutions with the pH of 2, 3, 4, 5 and 6 by a 360 W microwave (2.45 GHz) at 5 min/cycle for 12 cycles (60 min) and were well characterized by X-ray diffraction, Fourier transform infrared spectroscopy, scanning electron microscopy, transmission electron microscopy, selected area electron diffraction, UV–visible spectroscopy, photoluminescence spectroscopy and Brunauer–Emmett–Teller surface area analysis. According to the analytical results, pure BiOIO₃ nanoplates were synthesized at the pH of 2 and 3 and were transformed into pure Bi₂O₃ nanoparticles at the pH of 6. The photocatalytic activities of products were studied through the degradation of rhodamine B solutions under visible light irradiation. The as-synthesized BiOIO₃ nanoplates with band gap energy of 2.90 eV synthesized at the pH of 3 have the highest decolorization efficiency of 97.9% and pseudo-first-order degradation rate of 0.0442 min⁻¹ within 60 min.

中文翻译：

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pH对微波辅助合成BiOIO 3纳米板的相和形貌及其光催化活性的影响

研究了前驱体溶液pH值对BiOIO _3的相，形貌和光学性质的影响。通过360 W微波（2.45 GHz）在5分钟/循环的12个循环（60分钟）的pH为2、3、4、5和6的溶液中合成产物，并通过X射线衍射对其进行了很好的表征，傅里叶变换红外光谱，扫描电子显微镜，透射电子显微镜，选定区域电子衍射，紫外可见光谱，光致发光光谱和Brunauer-Emmett-Teller表面积分析。根据分析结果，在2和3的pH值下合成纯BiOIO ₃纳米板，并将其转化为纯Bi ₂ O _3。pH值为6的纳米颗粒。通过在可见光照射下降解若丹明B溶液，研究了产品的光催化活性。在pH为3时合成的带隙能为2.90 eV的合成BiOIO ₃纳米板在60分钟内的最高脱色效率为97.9％，伪一级降解率为0.0442 min ^-1。