MnO_(2)-生物炭材料协同过一硫酸盐快速高效去除双酚A的行为和机理研究

Behavior and mechanism of MnO_(2)-biochar synergistic with PMS for rapid and efficient removal of bisphenol A

通过化学共沉淀法与KMnO_(4)溶液反应制备得到了表面负载MnO_(2)的芦苇生物炭材料MnO_(2)-PAAC.同时,通过SEM、FTIR、XPS等一系列表征证明MnO_(2)成功负载在芦苇生物炭表面,且其具有较大的比表面积、丰富的官能团等特征.最后,在MnO_(2)-PAAC与过一硫酸盐复合物(PMS)系统中,评估了MnO_(2)-PAAC对双酚A的吸附和氧化性能,并系统研究了不同环境影响因素如投加量、环境温度、环境pH及共存阴离子的影响.结果表明,MnO_(2)-PAAC在PMS系统中提高了对双酚A的去除能力和效率,其去除机制由吸附和氧化降解(自由基和非自由基途径)两种路径共同参与,且降解后产物毒性明显变小.这些研究结果表明,MnO_(2)-PAAC可以作为一种快速高效的材料去除水环境中的双酚A.

In this study,Phragmites australis biochars loaded with MnO_(2)(MnO_(2)-PAAC)was prepared by chemical co-precipitation and KMnO_(4)solution reaction.It was proved that MnO_(2)was successfully loaded on the surface of PAAC with large specific surface area and abundant functional groups via SEM,FTIR and XPS.The adsorption and oxidation properties for bisphenol A(BPA)were evaluated in the MnO_(2)-PAAC and peroxymonosulfate(PMS)system.The effects of environmental factors such as dosage,temperature,pH and coexisting anions were systematically studied.Results showed that MnO_(2)-PAAC improved the removal capacity and efficiency of BPA in PMS system,and the removal mechanism was composed of adsorption and oxidative degradation(radical and non-radical pathways).The toxicity of degraded products was significantly reduced.These results demonstrate that MnO_(2)-PAAC can be used as a fast and efficient material for the removal of BPA in aqueous environments.