东南大学学报（英文版）2020，Vol.36Issue(4)：475-482,8.DOI:10.3969/j.issn.1003-7985.2020.04.013
Mn(NO3)2对椰壳活性炭改性机理
Mechanism of coconut husk activated carbon modified by Mn(NO3)2
摘要
Abstract
To study the mechanism by which activated carbon is modified by HNO3 and Mn(NO3)2,the pore texture and surface chemical characteristics of carbon materials in coconut husk activated carbon(AC)were examined via scanning electron microscopy(SEM),Brunauer-Emmett-Teller(BET),X-ray diffraction(XRD),Fourier-transform infrared spectroscopy(FTIR),and X-ray photoelectron spectroscopy(XPS).After being modified by HNO3,the millipore character of AC became deformed,and the character of the adjacent pores remained consolidated.The surface manganites of Mn/AC-1 presented as block and reticular fiber structures,Mn/AC-2's surface manganites presented as petty mammock crystals,and Mn/AC-3's surface manganites were observed as gauze nanosheets that interlace to fill in the pore canal.Nitric acid modification was shown to enlarge surface pores but decrease the specific surface area of AC.Mn loading can be used to construct a new pore structure that,in turn,increased the total specific surface area as well as the specific surface area and the volume of the millipores.Mn/AC-2's pore structure was optimized at a calcination temperature of 500 ℃and a loading quantity of 5％.The ash content of AC was considerably reduced after modified by HNO3.The active materials for Mn/AC-1 mainly consisted of Mn3O4,with a few Mn2O3 crystals,whereas Mn/AC-2's materials were mainly Mn3O4 and some MnO crystals.Mn/AC-3 was exclusively composed of Mn3O4.HNO3 activation and Mn loading modification did not considerably affect the functional group species present on the catalyst.Modification conditions using the same loading quantities and higher calcination temperatures decreased the number of O—H and N—H bonds while conversely increasing the number of C =C and C—O bonds.On the contrary,the use of a higher loading quantity while maintaining the same calcination temperature increased the number of O—H and N—H bonds.A higher loading quantity is beneficial for increasing Mn4+species.A higher calcination temperature is beneficial for increasing Mn3+species.The results can optimize the conditions under which Mn/AC catalyst modification occurs,thus improving the physical and chemical properties of carbon-based sorbents.关键词
HNO3/Mn(NO3)2/椰壳活性炭/理化性质/改性机理Key words
HNO3/Mn(NO3)2/coconut husk activated carbon/physicochemical property/modification mechanism分类
化学化工引用本文复制引用
黄帮福,施哲,蔡鸣,于安和..Mn(NO3)2对椰壳活性炭改性机理[J].东南大学学报（英文版）,2020,36(4):475-482,8.基金项目
Foundation items:The Science and Technology Plan of Yunnan Science and Technology Department(No.2019FB077,202001AT070029),the Open Fund of Key Laboratory of Ministry of Education for Metallurgical Emission Reduction and Comprehensive Utilization of Resources(No.JKF19-08),the Industrialization Cultivation Project of Scientific Research Fund of Yunnan Provincial Department of Education(No.2016CYH07). （No.2019FB077,202001AT070029）
