Abstract:Biomass-based mesoporous carbons were prepared from bagasse by microwave assisted H3PO4 activation. Polyamine groups were modified on the prepared carbon channels’ surfaces by nitric acid oxidation followed by reaction with ethylenediamine. The influence of initial concentration, temperature, carbon dose on the adsorption capacity, characteristic and thermodynamics of Pb (II) on the modified mesoporous carbon was investigated. The results showed that nitrogen-containing groups such as amido and imido group were successfully grafted on the surface of mesoporous carbon. The introduction of nitrogen-containing polyamine groups greatly enhanced the separation of Pb (II) from aqueous solution. The Langmuir Pb (II) adsorption capacity on the polyamine-modified carbon reached nearly 180mg/g, which was 1.5times of that on the untreated mesoporous carbon. The removal rate of Pb (II) from aqueous solution was significantly improved on the polyamine-modified carbon. Almost 100% of Pb (II) was adsorbed on the modified carbon with Pb (II) initial concentration less than 60mg/L. The adsorption amount of Pb (II) was increased with increasing temperature. The adsorption behavior and thermodynamic data suggested that the polyamine-modified material had a heterogeneous surface energy distribution, the adsorption was a spontaneous endothermic process, and chemical reaction could be involved and play an important role.
李坤权, 杨美蓉, 王燕锦, 贾佳祺, 郑正. 新型胺化介孔炭的制备及其对Pb(II)的吸附[J]. 中国环境科学, 2014, 34(8): 1985-1992.
LI Kun-Quan, YANG Mei-Rong, WANG Yan-Jin, JIA Jia-Qi, ZHENG Zheng. Preparation of amine-modified mesoporous activated carbon and its adsorption of lead (II) from aqueous solution. CHINA ENVIRONMENTAL SCIENCECE, 2014, 34(8): 1985-1992.