Influence of Surface Modification by Nitric Acid on Activated Carbons Adsorption of Nickel Ions
Four kinds of commercial activated carbons were soaked in sodium hydroxide after modification with 10% nitric acid.Nickel adsorption isotherms for modified activated carbons before and after sodium hydroxide treatment were tested.The surface groups were characterized by the Fourier transform infrared spectroscopy and Boehm titration,the adsorption properties were determined by the iodine number and methylene blue number,the pHIEP were deduced by the Zeta potential analyzer.The results showed that nitric acid blocks the pore,while enhances the content of acid groups,especially carboxyl resulting in the decrease of nickel adsorption capacity.After sodium hydroxide treatment,the nickel capacity of activated carbon from anthracite,long flame coal,lignite and coconut increased by 21.5%,116%,78.9%,89.1% comparing with the virgin activated carbon,respectively.The overall research indicated that nickel ion adsorption capacity of activated carbon can be improved only when the acid groups are transferred into anion,and the modification is more effective on the activated carbon prepared by low metamorphic grade coal.
Activated carbon Nickel ion Nitric acid Sodium hydroxide Modification
Juan Liu Huiping Fan Guozhuo Gong Qiang Xie
School of Chemical and Environmental Engineering, China University of Mining and Technology(Beijing) Beijing Municipal Institute of Labour Protection, Beijing 100054, China
国际会议
the Chinese Materials Congress 2012(2012年中国材料大会(CMC2012))
太原
英文
545-550
2012-07-13（万方平台首次上网日期，不代表论文的发表时间）