Preparation and characterization of magnetic mesopores activated carbon from Iignite
JIANG Yong
ZHANG Qingwei
WANG Sheng
XIE Qiang
WANG Xinle
YAO Xin
Abstract：In order to improve adsorptive property of activated coke,a magnetic activated carbon with developed mesopores was prepared by one-step method taking lignite as raw material,Fe3 O4 as magnetic reagent. The specific surface area,pore structure of activated coke and the crystal type,properties of magnetic reagent were characterized by low temperature nitrogen adsorption,X-ray diffraction and vibrating sample magnetometer. The effects of carbonization and activation conditions were researched. The results showed that the Fe3 O4 in magnetic activated carbon which was able to catalyze ablation of carbon and magnetize activated carbon,existed in the forms of FeO,γ-Fe2 O3 and unreacted Fe3 O4 . The optimized technical parameter was that the carbonization and the following activation of magnetic activated carbon with 6% Fe3 O4 were carried out at 650 ℃ for 60 minutes and 930 ℃ for 120 minutes respectively. The activation vapour flow was 0. 77 g/(g·h)based on the weight of carbonized material. The specific surface area of magnetic activated carbon at the optimized conditions was 370 m2 / g,the ratio of mesopore volume was 55. 7% ,the saturation magnetization was 1. 36 emu/ g,the remanence was 0. 46 emu/ g, the coercivity was 643. 17 Oe and the specific susceptibility was 7. 19x10-6 m3 / kg respectively. The magnetic activated carbon was weak magnetic mineral,and it could be recovered by high intensity magnetic separator.
Keywords：coal-based activated carbonmagnetismlignitemesopore activated carbon
Publication Date：2015-01-01
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：6( 1-5,10 )