乙醇辅助氨基改性NCR-MCM-48分子筛的制备及其对Cr(VI)的吸附性能

硅酸盐通报 ›› 2021, Vol. 40 ›› Issue (6): 2118-2128.

• 新型功能材料 • 上一篇

乙醇辅助氨基改性NCR-MCM-48分子筛的制备及其对Cr(VI)的吸附性能

崔艳红^1,2, 孙鹏¹, 汪颖军², 所艳华², 张微², 王彦宏³

1.黑龙江八一农垦大学实验设备管理中心,农业农村部农产品及加工品质量监督检验测试中心(大庆),大庆 163319;
2.东北石油大学化学化工学院,大庆 163318;
3.黑龙江八一农垦大学园艺园林学院,大庆 163319

收稿日期:2020-12-27 修回日期:2021-02-21 出版日期:2021-06-15 发布日期:2021-07-08
通讯作者: 王彦宏,博士研究生,讲师。E-mail:75220085@qq.com
作者简介:崔艳红(1977—),女,博士研究生,助理研究员。主要从事生物质转化方面的研究。E-mail:422536337@qq.com
基金资助:
大庆市指导性科技计划(zd-2019-51);校内培育课题资助计划(XZR2016-14);东北石油大学“国家基金”培育基金(2017PYYL-03)

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

CUI Yanhong^1,2, SUN Peng¹, WANG Yingjun², SUO Yanhua², ZHANG Wei², WANG Yanhong³

1. Quality Supervision, Inspection and Test Center of Agricultural and Processed Products (Daqing), Ministry of Agriculture and Rural Affairs,Center of Management of Laboratory Equipment, Heilongjiang Bayi Agricultural University, Daqing 163319, China;
2. College of Chemistry & Chemical Engineering, Northeast Petroleum University, Daqing 163318, China;
3. College of Horticulture and Landscape Architecture, Heilongjiang Bayi Agricultural University, Daqing 163319, China

Received:2020-12-27 Revised:2021-02-21 Online:2021-06-15 Published:2021-07-08

摘要/Abstract

摘要： 以稻壳灰提纯出的硅胶为无机组装硅源,乙醇为辅助试剂,通过水热合成法制备了CR-MCM-48分子筛,并对其氨基改性接枝制备NCR-MCM-48介孔分子筛。实验探讨了硅钠比、晶化温度、晶化时间及乙醇含量对CR-MCM-48介孔结构和形貌的影响。通过X射线粉末衍射仪(XRD)、扫描电子显微镜(SEM)、透射电子显微镜(TEM)、N₂吸附-脱附曲线和红外光谱(FT-IR)对合成材料进行了结构和形貌表征,并对NCR-MCM-48介孔材料吸附水溶液中Cr(VI)的性能进行了评价。结果表明,当物料摩尔比n(Si)∶n(CTAB)∶n(H₂O)∶n(NaOH)∶n(C₂H₅OH)=1.0∶0.65∶62∶0.625∶0.25,晶化温度为393 K,晶化时间为72 h,焙烧温度为823 K时,组装合成的CR-MCM-48介孔材料有序度最好。热力学分析结果表明,NCR-MCM-48对Cr(VI)的吸附是自发、吸热反应。在吸附温度为308 K、pH=2.0、吸附时间为150 min的条件下,NCR-MCM-48吸附剂对Cr(VI)的最大吸附容量为88.9 mg·g^-1。

关键词: 分子筛, 稻壳, MCM-48, 氨基, 吸附, Cr(VI)

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)

中图分类号:

TQ424

崔艳红, 孙鹏, 汪颖军, 所艳华, 张微, 王彦宏. 乙醇辅助氨基改性NCR-MCM-48分子筛的制备及其对Cr(VI)的吸附性能[J]. 硅酸盐通报, 2021, 40(6): 2118-2128.

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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乙醇辅助氨基改性NCR-MCM-48分子筛的制备及其对Cr(VI)的吸附性能

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

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