新型磁性生物炭活化过一硫酸盐降解双酚 A

文章使用溶胶-凝胶燃烧法制备磁性生物炭 $ CuFe_{2}O_{4} $ @SBC，并将其用于活化过一硫酸盐（peroxymonosulfate，PMS）降解双酚 A（bisphenol，BPA）。通过 X 射线衍射（X-ray diffraction，XRD）分析、扫描电子显微镜（scanning electron microscope，SEM）、傅里叶变换红外光谱（Fourier transform infrared spectroscopy，FTIR）和 X 射线光电子能谱（X-ray photoelectron spectroscopy，XPS）分析等表征方法探究该复合材料的理化特性，结果表明， $ CuFe_{2}O_{4} $ 稳定地负载在生物炭表面，且复合材料表面有大量的含氧官能团，如 O=C=O、C—O—C 和—OH。通过批次试验，探究该材料在不同条件下活化 PMS 降解 BPA 的效果，并进行伪一级动力学拟合。结果表明，BPA 的去除率随着磁性生物炭投加量、PMS 浓度、温度和 pH 值的增加而增加。通过重复利用试验发现，磁性生物炭在第 3 轮催化降解试验中对 BPA 的降解率仍能达到 91%。此外，通过淬灭试验发现， $ ^{1}O_{2} $、 $ \cdot OH $、 $ SO_{4}^{-} $和 $ O_{2}^{-} $都参与了 BPA 的降解，其中 $ ^{1}O_{2} $ 是最主要的活性物种。

In this work, magnetic $ CuFe_{2}O_{4} $ @ SBC composites were prepared by sol-gel combustion method and used to degrade bisphenol A (BPA) by activating peroxymonosulfate (PMS). X-ray diffraction (XRD), scanning electron microscope (SEM), Fourier transform infrared spectroscopy (FTIR) and X-ray photoelectron spectroscopy (XPS) were used to investigate the physicochemical activities of the composite materials. The results showed that $ CuFe_{2}O_{4} $ was stably loaded on the surface of biochar, and the composite materials had abundant oxygen-containing functional groups such as O=C=O, C-O-C and -OH. By batch experiments, the degradation effects of BPA by activating PMS were investigated under different conditions, and pseudo-first-order kinetic fitting was performed. The results showed that the removal rate of BPA increased with the increase of magnetic biochar dosage, PMS dosage, temperature and pH value. It was found that the magnetic biochar could still degrade 91% of BPA in the third round of catalytic degradation tests. In addition, $ ^{1}O_{2} $, $ \cdot OH $, $ SO_{4}^{-} $ and $ O_{2}^{-} $ were found to be involved in the degradation of BPA through quenching experiments, and $ ^{1}O_{2} $ was the most effective species.