Chinese Journal of Applied Chemistry ›› 2021, Vol. 38 ›› Issue (4): 447-456.DOI: 10.19894/j.issn.1000-0518.200245

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Construction of Hierarchical NiO Microspheres and the Adsorption Capacity to Congo Red Azo-dye

SUI Li-Li1*, JIANG Hui-Ye1, WANG Di1, HUANG Wei-Wei1, SUI Wei-Wei2*, SHEN Shu-Chang1, WANG Ping1, ZHANG Wen-Zhi1, WANG Wen-Bo1, ZHAO Bing1, LIU Yong-Zhi1   

  1. 1School of Chemistry and Chemical Engineering, Qiqihar University, Qiqihaer 161006, China
    2Ocean Department of Hebei Agricultural University, Qinhuangdao, 066003, China
  • Online:2021-06-01
  • Supported by:
    Supported by the National Natural Science Foundation of China (Nos.51802167, 21978140, 21776144), the Natural Science Foundation of Heilongjiang Province (No.QC2018015) and the Research Foundation of Education Bureau of Heilongjiang Province (No.135409208).

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

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