摘要：Polyvinyl alcohol (PVA) is a widely used water-soluble polymer, though it is difficult to degrade by biotreatment. Dyeing wastewater contains a lot of PVA, which has become one of the most important water pollution sources. In this research, PVA was efficiently removed by activated carbon fibre (ACF) in a batch adsorption system. Effect of solution pH, and adsorption isotherm were emphatically studied. By the study of pH effect, it was observed that near-neutral solution pH conditions were more favourable for the adsorptive removal of PVA. For the isotherm study, Langmuir model described the adsorption isotherm better than Freundlich model, with a maximum PVA adsorption capacity of 6287.4 mg/g at 288 K. The changes of enthalpy and entropy of the adsorption processes are 12.38 KJ mol-1 and 43.7 J mol-1 k-1, respectively. The negative value of Gibbs free energy change and the positive value of enthalpy also demonstrated that the adsorption process is spontaneous and endothermic. All these results indicated that the ACF is a suitable adsorbent for the removal of PVA from water.
