化工学报2011，Vol.62Issue(4)：977-985,9.
直接耐酸性枣红在脱硅稻壳活性炭上的吸附热力学与动力学特性
Kinetic and thermodynamic characteristics of direct fast bordeaux adsorption on activated carbon from silicon-freed rice hull
摘要
Abstract
The activated carbon was prepared from silicon-freed rice hull by using phosphoric acid as activating agent. The effects of impregnation ratio, concentration of phosphoric acid solution, calination temperature and calination time were studied. The experimental results showed that the suitable condition for preparation of the activated carbon was impregnation ratio 2: 1, concentration of phosphoric acid solution 50％, calination temperature 500°C, and calination time 1 h. The activated carbon was characterized by means of X-ray diffraction (XRD), Brunauer-Emmett-Teller (BET), Fourier transform infrared spectra (FTIR), X-ray energy dispersive spectrum (EDS) and high resolution transmission electron microscopy (HRTEM) techniques. The kinetic and thermodynamic parameters for the absorption of direct fast bordeaux in aqueous solution by the activated carbon were studied. The study on the thermodynamic behavior indicates that the absorption of direct fast bordeaux obeys the Langmuir isotherm model. The adsorption enthalpy is 61.31 kJ · mol-1 , the Gibbs free energy is - 39. 99-- 28. 71 kJ · mol-1 , and the entropy is about 297 J · mol-1 · K-1 , so the adsorption process is endothermic and spontaneous. The study on kinetic parameters shows that the absorption is best described by the intra-particle diffusion model, and the apparent activation energy is determined to be 33.34 kJ · mol-1.关键词
稻壳/活性炭/直接耐酸性枣红/吸附热力学/吸附动力学Key words
rice hull/ activated carbon/ direct fast bordeaux/ adsorption thermodynamics/ adsorption kinetics分类
资源环境引用本文复制引用
姚超,秦泽勇,吴凤芹,李锦春,王茂华,魏科年..直接耐酸性枣红在脱硅稻壳活性炭上的吸附热力学与动力学特性[J].化工学报,2011,62(4):977-985,9.基金项目
江苏省科技支撑计划项目(BE2009099) （BE2009099）
江苏省高校自然科学研究项目(09KJA430002) （09KJA430002）
江苏省自然科学基金项目(BK2009748). （BK2009748）
