Preparation of Amino Modified NCR-MCM-48 Molecular Sieve by Ethanol Assisting and Its Adsorption Performance of Cr(VI)

Abstract

Abstract: CR-MCM-48 molecular sieve was prepared through hydrothermal synthesis method with the silica gel purified from rice husk ash as the source of inorganic assembled silicon and the ethanol as the assisted reagent, and then NCR-MCM-48 mesoporous molecular sieve was synthesized by amino grafting to CR-MCM-48. The effects of the molar ratio of Si and Na, crystallization temperature, crystallization time and the addition of the organic assisted reagent ethanol on the mesoporous structure and the morphology of CR-MCM-48 were investigated. X-ray powder diffraction (XRD), scanning electron microscope (SEM), transmission electron microscope (TEM), N₂ adsorption-desorption curves and infrared spectroscopy (FT-IR) were used to characterize the structure and the morphology of the synthesized materials. The adsorption performance of Cr(VI) in aqueous solution by NCR-MCM-48 mesoporous material was evaluated. The results show that when n(Si)∶n (CTAB)∶n(H₂O)∶n(NaOH)∶n(C₂H₅OH) is 1.0∶0.65∶62∶0.625∶0.25, the crystallization temperature is 393 K, the crystallization time is 72 h, and the calcination temperature is 823 K, the assembled and synthesized CR-MCM-48 mesoporous material exhibits the best degree of order. The results of thermodynamic analysis show that the adsorption of Cr(VI) by NCR-MCM-48 is a spontaneous and endothermic reaction. The maximum adsorption capacity of NCR-MCM-48 for Cr(VI) is 88.9 mg·g^-1 when the adsorption temperature is 308 K, pH is 2.0, and the adsorption time is 150 min.

Key words: molecular sieve, rice husk, MCM-48, amino, adsorption, Cr(VI)

CLC Number:

TQ424

CUI Yanhong, SUN Peng, WANG Yingjun, SUO Yanhua, ZHANG Wei, WANG Yanhong. Preparation of Amino Modified NCR-MCM-48 Molecular Sieve by Ethanol Assisting and Its Adsorption Performance of Cr(VI)[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2021, 40(6): 2118-2128.

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