木质纤维素对水溶液中亚甲基蓝的吸附性能

Properties of adsorbing methylene blue of lignocellulose in aqueous solution

以木质纤维素为吸附剂,分析吸附时间、初始浓度、pH值、温度等因素对木质纤维素吸附亚甲基蓝阳离子染料的影响。结果表明:木质纤维素对亚甲基蓝吸附300 min后达到平衡,初始浓度超过180 mg/L后吸附量不再增加,pH值由2增加到8时,吸附量由23.0 mg/g增加到40.1 mg/g,温度对吸附量呈现先增大后减小的趋势。讨论了Langmuir和Freundlich等温线模式,相关系数表明吸附过程符合Langmuir等温模式,用伪一级动力学和伪二级动力学对吸附数据进行拟合分析,结果表明吸附过程较好地符合伪二级动力学模型。

Using lignocellulose as an adsorbent,the effects of parameters such as adsorption time,initial concentration,pH value and temperature on the removal of methylene blue dye ion from aqueous solutions were investigated.The results showed that adsorption equilibrium of lignocellulose for methylene blue reached after 300 minutes.The adsorption capacity of lignocellulose reached steady state when the initial concentration exceeded 180 mg/L.The adsorption capacity increased from 23 mg/g to 40.1 mg/g when the solution pH value increased from 2 to 8.The adsorption capacity increased first and then decreased with increasing temperature.The Langmuir and Freundlich adsorption isotherm models were discussed.The correlation coefficient indicated that the adsorption process of lignocellulose accorded with Langmuir adsorption isotherm model.The pseudo-firstorder and the pseudo-second-order kinetic models were used to describe the adsorption data.The results showed that the adsorption process of lignocellulose met well with the pseudo-second-order kinetic model.