Mn/Mg/Ce-FA基催化剂制备及印染废水处理研究

Preparation of Mn/Mg/Ce-FA-Based Catalyst and Treatment of Dyeing Wastewater

针对目前印染废水中存在大量的染料颗粒,对生态系统中水资源质量以及生态环境造成了严重影响。本研究采用共沉淀法制备了锰/镁/铈(Mn/Mg/Ce)-粉煤灰(FA)基催化剂,并研究了其在孔雀石绿(MG)和甲基紫(MV)染料降解过程中的性能和作用机理。利用XRD、FT-IR、SEM、EDS对催化剂的结构、形貌及组成进行了表征,研究了催化剂与染料溶液的接触时间、催化剂用量和染料溶液的pH值对催化剂降解率的影响。结果表明,Mn/Mg/Ce-FA基催化剂颗粒表面金属氧化物附着均匀、催化效果较好。当接触时间为40min、催化剂用量为12g/L、染料溶液pH值为8时,催化剂对MG的降解效果最好;当接触时间为20min、催化剂用量为15g/L、染料溶液pH值为6时,催化剂对MV的降解效果最好,降解率能达到95%以上。Mn/Mg/Ce-FA基催化剂是一种性能良好的染料降解催化剂,在印染废水及其他的工业染料应用回收领域,具有广阔应用前景。

Since there are many dye particles in the printing and dyeing wastewater,the quality of water resources and the environment have been seriously affected.In this study,Mn/Mg/Ce-FA based catalysts were prepared by coprecipitation methods,and their properties and mechanisms in the degradation of malachite green(MG)and methyl violet(MV)dyes were investigated.Structure,morphology,and composition of the catalysts were characterized by XRD,FT-IR,SEM,and EDS.The effects of contact time between catalyst and dye solution,catalyst dosage and pH of the dye solution on the degradation rate of catalysts were investigated.The results showed that the metal oxides were uniformly deposited on the surface of the Mn/Mg/Ce-FA catalyst particles and the catalytic effect was good.When the contact time,catalyst dosage,and pH of the dye solution was 40min,12g/L and 8,the catalyst had the best degrading effect on MG.When the contact time,catalyst dosage,and pH of the dye solution was 20min,15g/L and 6,the catalyst had the best degradation effect on MV with a degradation rate of more than 95%.The Mn/Mg/Ce-FA catalyst is a kind of dye decomposition catalyst with good performance,which has broad application prospects in printing and dyeing waste water and other fields of industrial dye application and recovery.