兰炭改性及其对甲基橙吸附性能研究
发布时间：2019-06-05 03:57
【摘要】：文章采用氯化锌水溶液对废弃的兰炭末进行改性,研究了改性兰炭末对水溶液中甲基橙(MO)吸附性能的影响,并探讨其吸附机理。结果表明:改性兰炭末对MO的吸附量随着温度升高而降低,吸附为放热过程,在298K时达372.1mg/g;吸附等温线呈S型,不是一个简单的单分子层吸附,低质量浓度的MO溶液在改性兰炭末上的吸附符合Freundlich模型,高质量浓度时则符合BET多分子层吸附;准二级动力学方程可较好地描述其吸附动力学过程,颗粒内扩散是吸附速率控制步骤,表观活化能Ea为19.21kJ/mol。
[Abstract]:In this paper, the waste blue carbon was modified by zinc chloride aqueous solution. The effect of modified blue carbon on the adsorption properties of methyl orange (MO) in aqueous solution was studied, and the adsorption mechanism was discussed. The results showed that the adsorption capacity of MO decreased with the increase of temperature, and the adsorption was exothermic, which reached 372.1 mg / g at 298K. The adsorption isotherm is S-shaped, which is not a simple monolayer adsorption. The adsorption of low concentration MO solution on modified blue carbon accords with Freundlich model, but at high concentration it accords with BET multimolecular layer adsorption. The quasi-second-order kinetic equation can well describe the adsorption kinetics. The intra-particle diffusion is the control step of adsorption rate, and the apparent activation energy Ea is 19.21kJ 鈮，
本文编号：2493237
[Abstract]:In this paper, the waste blue carbon was modified by zinc chloride aqueous solution. The effect of modified blue carbon on the adsorption properties of methyl orange (MO) in aqueous solution was studied, and the adsorption mechanism was discussed. The results showed that the adsorption capacity of MO decreased with the increase of temperature, and the adsorption was exothermic, which reached 372.1 mg / g at 298K. The adsorption isotherm is S-shaped, which is not a simple monolayer adsorption. The adsorption of low concentration MO solution on modified blue carbon accords with Freundlich model, but at high concentration it accords with BET multimolecular layer adsorption. The quasi-second-order kinetic equation can well describe the adsorption kinetics. The intra-particle diffusion is the control step of adsorption rate, and the apparent activation energy Ea is 19.21kJ 鈮，
本文编号：2493237
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