Modification Mechanism of Coconut Husk Activated Carbon Using FeSO4 and Fe(NO3)3  

作　　者：HUANG Bangfu LIU Lanpeng WANG Defu LI Lu 黄帮福;刘兰鹏;汪德富;李露(Department of Metallurgical Engineering, Kunming University of Science and Technology, Kunming 650093, China;Clean Metallurgy Key Laboratory of Complex Iron Resources, University of Yunnan Province, Kunming 650093, China)

机构地区：[1]Department of Metallurgical Engineering,Kunming University of Science and Technology,Kunming 650093,China [2]Clean Metallurgy Key Laboratory of Complex Iron Resources,University of Yunnan Province,Kunming 650093,China

出　　处：《Journal of Donghua University(English Edition)》2020年第4期316-326,共11页东华大学学报（英文版）

基　　金：General Project of Science and Technology Plan of Yunnan Science and Technology Department,China(No.2019FB077);Open Fund of Key Laboratory of Ministry of Education for Metallurgical Emission Reduction and Comprehensive Utilization of Resources,China(No.JKF19-08)。

摘　　要：Modification conditions determine the surface topography and the active material phase composition of a catalyst.To study the influence of modification on a carbon-based sorbent,coconut husk activated carbon(AC)which was activated using HNO3 and modified by FeSO4 and Fe(NO3)3 was examined.The pore textures and surface chemical characteristics of the carbon materials were examined by scanning electron microscopy(SEM),Brunner-Emmet-Teller(BET),X-ray diffraction(XRD)and Fourier transform infrared(FTIR)spectroscopy.The surface topography,the pore structure,active materials,and functional groups of AC,AC modificated by HNO3(HNO3/AC for short),and AC modificated by FeSO4 and Fe(NO3)3(Fe/AC for short)were systematically studied.Subsequently,the mechanism of modifying the conditions for the carbon materials was determined.Results showed that the surface micro topography of HNO3/AC became unsystematic and disordered.After modification with FeSO4,the ferriferous oxide was mainly present as a near-spherical crystal.Ferriferous oxides from Fe(NO3)3 modification mainly exhibited a plate shape.HNO3 modification could enlarge the pores but decrease the specific surface area of AC.FeSO4 modification resulted in a new net post structure in the pore canal of AC.Fe(NO3)3 modification caused the pore space structure to develop in the interior,and a higher calcination temperature was useful for ablation.The ash content of the AC was substantially reduced upon HNO3 modification.Upon FeSO4 modification,α-FeOOH,α-Fe2O3 andγ-Fe2O3 coexisted under the condition of a lower concentration of FeSO4 and a lower calcination temperature,and a higher FeSO4 concentration and calcination temperature generated moreα-Fe2O3.The same Fe(NO3)3 modification and a higher calcination temperature were beneficial to the minor chipping formation ofγ-Fe2O3.A higher Fe(NO3)3 loading produced a lower graphitization degree.HNO3 modification formed various new oxygen-containing functional groups and few nitrogen-containing groups.Based on the cover,FeSO4 and

关 键 词：HNO3 FESO4 Fe(NO3)3 coconut husk activated carbon CHARACTERIZATION modification mechanism 

分 类 号：TQ424[化学工程]