废菌渣活性炭对苯酚和铜离子的吸附性能分析

以废菌渣为原料,采用硫酸铝与硝酸复合改性制备废菌渣活性炭,应用红外光谱分析和等电点进行表征,并对活性炭吸附苯酚、铜离子的动力学与等温线进行拟合分析.实验结果表明:活性炭具有芳香共轭结构,表面富含多种官能团,有利于对苯酚、铜离子的吸附;活性炭对苯酚、铜离子的吸附满足二级动力学模型,且颗粒内扩散不是控制吸附速率的主要步骤;活性炭对苯酚的吸附为自发放热的优惠吸附,而对铜离子的吸附为自发吸热的优惠吸附,符合Freundlich等温吸附模型;双组分等温吸附仍满足Freundlich等温吸附模型,苯酚与铜离子在活性炭上的吸附表现为协同作用;活性炭对苯酚的吸附机理主要为疏水键力,而对铜离子的吸附机理主要为离子交换和配位作用.

Adsorption of Phenol and Copper Ions by Mushroom Residue Activated Carbon

Activated carbon from spent mushroom residue was prepared by composite modification of aluminum sulfate and nitric acid, and characterized by infrared spectroscopy and isoelectric point. The kinetics and isotherm of adsorption of phenol and copper ions on activated carbon were analyzed by fitting. The experimental results show that the activated carbon has an aromatic conjugate structure and the surface is rich in various functional groups, which is conducive to the adsorption of phenol and copper ions; the adsorption of phenol and copper ions by activated carbon satisfies the second-level kinetic model, and intra-particle diffusion is not the main step to control the adsorption rate; the adsorption of phenol by activated carbon is a preferential adsorption of self-release heat, and the adsorption of copper ions is a preferential adsorption of spontaneous heat absorption, which is in line with the Freundlich isotherm adsorption model; the two-component isothermal adsorption still meets the Freundlich isotherm model, and the adsorption of phenol and copper ions on activated carbon is synergistic; the adsorption mechanism of activated carbon on phenol is mainly hydrophobic bond force, and the adsorption mechanism for copper ions is mainly ion exchange and coordination.