铁基硼掺杂多孔炭催化降解双酚A的研究

Catalytic degradation of bisphenol A by Fe@B-doped porous carbon

采用铁基金属有机骨架材料MIL-100(Fe)作为前驱体,外加硼源制备了铁基硼掺杂多孔炭(Fe@BPC),将其用于催化单过硫酸氢盐(PMS)降解水中双酚A(BPA),同时分析Fe@BPC的形貌结构,研究PMS浓度、催化剂投加量、初始pH等对降解效果的影响。结果表明,在催化剂投加量为0.10 g/L、PMS摩尔浓度为1.00 mmol/L、BPA为10 mg/L、初始pH=7的条件下,Fe@BPC对BPA的降解率为98.3%。在较宽的初始pH(3~11)范围内,Fe@BPC仍保持较好的催化活性,且4次循环后对BPA降解率仍可达95%以上。利用自由基淬灭实验和电子顺磁共振(EPR)技术对反应过程中产生的活性氧物质(ROS)进行了分析,结果表明,体系中可能同时存在SO_(4)-·、·OH、·O_(2)-和^(1)O_(2),共同对BPA的降解发挥作用。Fe@BPC中存在的Fe^(0)、铁氧化物、—BC_(2)O和—BCO_(2)是其具备良好催化活性的原因。

Fe@B-doped porous carbon(Fe@BPC),prepared with iron-based metal-organic framework MIL-100(Fe)as precursors and external B source,was used to catalyze peroxymonosulfate to degrade bisphenol A(BPA)in water.The morphology and structure of the Fe@BPC were characterized,and the effects of PMS concentration,catalyst dosage,initial pH,etc.on the degradation of BPA were investigated.The results showed that the removal of BPA was 98.3%with 1.00 mmol/L PMS,0.10 g/L Fe@BPC,initial pH=7 and 10 mg/L BPA.Fe@BPC maintained a good catalytic activity in a wide range of the initial pH(3-11).Furthermore,the removal of BPA still reached 95%even the Fe@BPC were cycled for four consecutive runs.Based on the results of the radical queching and electron spin resonance experiments,SO_(4)-·,·OH,·O_(2)- and ^(1)O_(2) might coexist in the system and contribute to the degradation of BPA.The good catalytic performence of Fe@BPC was mainly attributed by the abundant Fe 0,iron oxide,—BC_(2)O and—BCO_(2).