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研究报告

Behavior and mechanism of MnO₂-biochar synergistic with PMS for rapid and efficient removal of bisphenol A

摘要：通过化学共沉淀法与KMnO₄溶液反应制备得到了表面负载MnO₂的芦苇生物炭材料MnO₂-PAAC.同时，通过SEM、FTIR、XPS等一系列表征证明MnO₂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MnO₂-PAAC与过一硫酸盐复合物（PMS）系统中，评估了MnO₂-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，MnO₂-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，MnO₂-PAAC可以作为一种快速高效的材料去除水环境中的双酚A.

Abstract：In this study， Phragmites australis biochars loaded with MnO₂（MnO₂-PAAC） was prepared by chemical co-precipitation and KMnO₄ solution reaction. It was proved that MnO₂ 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 MnO₂-PAAC and peroxymonosulfate （PMS） system. The effects of environmental factors such as dosage， temperature， pH and coexisting anions were systematically studied. Results showed that MnO₂-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 MnO₂-PAAC can be used as a fast and efficient material for the removal of BPA in aqueous environments.