多级结构NiO微球的构筑及对刚果红染料的吸附性能

doi:10.19894/j.issn.1000-0518.200245

摘要/Abstract

摘要： 无需加入模板和表面活性剂,采用简单的溶剂热法合成多级结构NiO微球前驱体,再经450 ℃热处理,得到多级结构NiO微球纳米材料。利用X射线粉末衍射(XRD)、扫描电子显微镜(SEM)、透射电子显微镜(TEM)和氮气吸附-脱附等技术对制备的材料进行结构及形貌分析。结果表明,合成的NiO微球直径600~800 nm,构筑单元为厚度约40 nm的多孔纳米片。该NiO微球纳米材料对刚果红(CR)染料表现出优良的吸附性能:当NiO吸附剂用量0.25 g/L,刚果红(CR)染料的质量浓度15 mg/L时,吸附10 min即可达到吸附平衡,此后移除率稳定在98.6％~99.7％,最大吸附容量为387.1 mg/g。该吸附过程符合拟二级动力学方程和朗格缪尔(Langmuir)吸附等温模型。 NiO微球具有三维立体的多级结构及大的比表面积和介孔结构,是一种高效的处理废水中有机染料的吸附剂。

关键词: 多级结构, NiO微球, 刚果红, 吸附性能

Abstract: The precursors of hierarchical NiO microspheres were prepared by a facile solvothermal route without any surfactant or template. The hierarchical NiO microspheres were obtained by subsequent calcination at 450 ℃ in air and characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM) and nitrogen adsorption-desorption techniques. The diameter of the NiO microspheres assembled by the porous nanosheets with a thickness of 40 nm is about 600~800 nm. The materials show an excellent adsorptive property to Congo Red (CR). When the amount of NiO absorbents is 0.25 g/L in the mass concentration of 15 mg/L of CR solution, the equilibrium can be established after adsorption for 10 min, and the removal percentages are in the range of 98.6%~99.7%. The maximum adsorption capacity is 387.1 mg/g. The adsorption kinetics is well fitted to a pseudo-second order model. The adsorption isotherm is accurately described by the Langmuir model. The 3D hierarchical NiO microspheres with large surface areas and mesoporous structures are a highly efficient adsorbent for treating organic dye-impacted wastewater.

Key words: Hierarchical structure, NiO microsphere, Congo red, Adsorptive property

中图分类号:

O614.8

隋丽丽, 姜惠烨, 王荻, 黄微微, 隋崴崴, 申书昌, 王平, 张文治, 王文波, 赵冰, 刘勇智. 多级结构NiO微球的构筑及对刚果红染料的吸附性能[J]. 应用化学, 2021, 38(4): 447-456.

SUI Li-Li, JIANG Hui-Ye, WANG Di, HUANG Wei-Wei, SUI Wei-Wei, SHEN Shu-Chang, WANG Ping, ZHANG Wen-Zhi, WANG Wen-Bo, ZHAO Bing, LIU Yong-Zhi. Construction of Hierarchical NiO Microspheres and the Adsorption Capacity to Congo Red Azo-dye[J]. Chinese Journal of Applied Chemistry, 2021, 38(4): 447-456.

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