PANI多孔吸附剂对酸性红G循环吸附应用探究

Research on the application of PANI porous adsorbent to the cyclic adsorption of acid red G

采用原位化学氧化聚合法制备了聚苯胺(PANI)/聚氨酯类填料(PBG)复合材料并对其形貌和结构进行了表征,探究不同条件下PANI/PBG复合材料对酸性红G(ARG)的吸附性能与吸附机理以及该吸附剂的再生性能。研究结果表明,①PANI/PBG复合材料吸附ARG的最佳投加量为8 g/L,在pH=1~5时,吸附去除率在90%以上;②PANI/PBG的平衡吸附量可达228.50 mg-ARG/g-PANI,且吸附平衡时间仅需30 min;③PANI/PBG复合材料吸附ARG过程符合准二级动力学模型和Langmuir等温线模型,表明该吸附过程为单层化学吸附,拟合的最大吸附量Q_(m)为368.59 mg/g;经过6次再生循环后PANI/PBG复合材料仍有良好的吸附性能。

In this paper,polyaniline(PANI)/porous bio-gel(PBG)composites are prepared by in-situ chemical oxidation polymerization and its morphology and structure are characterized.The effects of different conditions on the adsorption of acid red G(ARG)by PANI/PBG composites are explored.On this basis,the kinetic and isotherm models are established.The regeneration performance of the composites is also investigated.The research results show that the optimum dosage of PANI/PBG composites to adsorb ARG is 8 g/L,and the adsorption removal rate is above 90%when the pH is 1-5.The equilibrium adsorption capacity of PANI/PBG increases slightly with the increase of temperature,reaching 228.50 mg-ARG/g-PANI,and the adsorption equilibrium time is only 30 minutes.The adsorption process of ARG by PANI/PBG composites conforms to the Pseudo-second-order model and Langmuir isotherm model,which indicates that the adsorption process is single-layer chemical adsorption,and the maximum adsorption Q_(m) of fitting is 368.59 mg/g.PANI/PBG composites still have good adsorption performance after 6 cycles of regeneration experiments.