静电纺壳聚糖/PVA纳米纤维膜对甲基橙的吸附特性

以静电纺丝制备的壳聚糖(CS)/聚乙烯醇(PVA)纳米纤维膜为吸附剂,研究了反应时间、甲基橙初始质量浓度、膜吸附剂用量和pH值对吸附甲基橙染料的影响,并通过吸附动力学行为和吸附等温线研究了其吸附机制。结果表明:当pH值在5～9之间、甲基橙初始质量浓度为100 mg/L、吸附剂用量为30 mg、反应时间为60～120 min之间时,吸附效果最佳且吸附平衡时间为3 h;CS/PVA膜对甲基橙的吸附既有物理吸附也有化学吸附,化学吸附占主导作用,CS/PVA膜对甲基橙的吸附符合Langmuir等温线和拟二级动力学模型。

Adsorption Characteristics of Chitosan/PVA Nanofiber Membrane on Methyl Orange

The chitosan/PVA nanofiber membrane fabricated via eletrospining method was used as an adsorbent for methyl orange removal from water. The effect of reaction time, initial mass concentration of methyl orange, dosage of adsorbent, and pH value were investigated. In addition, adsorption kinetics model and isotherms have been studied to research the methyl orange adsorption mechanism onto the surface of CS/PVA membrane. The results show that when the pH is between 5 and 9, the initial mass concentration of methyl orange is 100 mg/L, the dosage of adsorbent is 30 mg, and the reaction time is between 60～120 min, the adsorption efficiency is the best and the adsorption equilibrium time is 3 h. There is both physical and chemical adsorption in the process of methyl orange adsorption onto CS/PVA membrane and chemical adsorption takes a dominated place. The adsorption of methyl orange on CS/PVA membrane accords with Langmuir isotherm and pseudo-second-order kinetic model.