Abstract

α-Ag₂WO₄ nanocrystals, mesoporous silica (SBA-15), and α-Ag₂WO₄/SBA-15 as a nanocomposite were prepared by sonochemical, hydrothermal, and in situ sonochemical methods respectively. Samples were characterized by X-ray diffraction (XRD), Rietveld refinement, micro-Raman, Fourier-transform infrared spectroscopy (FTIR), field emission scanning electron microscopy (FE-SEM), X-ray photoelectron spectroscopy (XPS), N₂ adsorption/desorption, ultraviolet–visible (UV–Vis) diffuse reflectance spectroscopy, and Zeta potential. XRD patterns, Rietveld refinement, and XPS spectra confirmed the formation of α-Ag₂WO₄, SBA-15, and α-Ag₂WO₄/SBA-15. XPS spectra evidenced the formation of metallic silver during analysis. FE-SEM images illustrated the deposition of α-Ag₂WO₄ nanocrystals mainly on the external surface of SBA-15. N₂ adsorption data showed that the textural properties of α-Ag₂WO₄/SBA-15 were similar to pure SBA-15. Zeta potential data demonstrated that all samples synthetized have negatively charged surface. The materials were tested as adsorbents for the dye cationic rhodamine B. The adsorption behavior of rhodamine B onto α-Ag₂WO₄, SBA-15, and α-Ag₂WO₄/SBA-15 correspond to Langmuir adsorption isotherm and pseudo-second-order kinetics. The maximum adsorption capacity of α-Ag₂WO₄/SBA-15 was up to 150 mg g⁻¹ and 99% removal efficiency for RhB 20 mg L⁻¹ in 15 min. Furthermore, 80% of RhB could be recuperated from adsorbents at pH 7.

Graphic Abstract

中文翻译：

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罗丹明B染料上α-Ag2 WO 4纳米晶体/ SBA-15介孔结构的细化，形貌特征，光学性质和吸附能力

摘要

α银₂ WO ₄的纳米晶体，介孔二氧化硅（SBA-15），和α-的Ag ₂ WO ₄ / SBA-15作为纳米复合材料是由声化学，水热制备，并且分别声化学方法原位。通过X射线衍射（XRD），Rietveld精制，微拉曼，傅立叶变换红外光谱（FTIR），场发射扫描电子显微镜（FE-SEM），X射线光电子能谱（XPS），N ₂表征样品吸附/解吸，紫外可见（UV-Vis）漫反射光谱和Zeta电位。XRD图案，Rietveld精修，以及XPS谱证实的形成α银₂ WO ₄，SBA-15，α-的Ag ₂ WO₄ / SBA-15。XPS光谱证明了分析过程中金属银的形成。FE-SEM图像示出的α-Ag的沉积₂ WO ₄纳米晶体主要是SBA-15的外表面。Ñ _2个吸附数据表明，α-Ag的质地性能₂ WO ₄ / SBA-15类似于纯SBA-15。Zeta电位数据表明，所有合成的样品均带有负电荷的表面。的材料进行了测试作为吸附剂用于染料阳离子罗丹明B.罗丹明B上的吸附行为α银₂ WO ₄，SBA-15，α-的Ag ₂ WO ₄/ SBA-15对应于Langmuir吸附等温线和拟二级动力学。α-AG的最大吸附容量₂ WO ₄ / SBA-15是高达150毫克克^-1和99％的去除效率为20罗丹明B毫克的L ^-1在15分钟。此外，在pH 7时，可从吸附剂中回收80％的RhB。

图形摘要