Abstract The property of biochar and its potential application toward chlorobenzene degradation were investigated in this study. The biochar was derived from rice husk and charred at 550 °C in N2 atmosphere, which showed a significant degradation of chlorobenzene in ambient atmosphere. The results from Scanning Electron Microscope, X-Ray Diffraction and Raman Spectroscopy indicated the formation of poorly ordered graphene stacks embedded in amorphous phases on biochar. Fourier Transform Infrared Spectroscopy and Electron Paramagnetic Resonance suggested the existence of hydroquinone-quinone moieties on biochar, which could induce the generation of reactive oxygen species and promote the degradation of chlorobenzene. Furthermore, hydrogen peroxide and hydroxyl radicals were generated from the reduction of oxygen with the oxidization of phenolic hydroxyl groups on biochar, which was responsible for chlorobenzene degradation. In addition, more types of intermediate products of chlorobenzene degradation were detected in biochar system compared with conventional Fenton reaction, which could be possibly ascribed to the interfacial reaction between chlorobenzene and reactive oxygen species on biochar surface. The findings in this study would provide a new insight into the application of biochar in organic pollutant removal.

中文翻译：

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稻壳生物炭的表征及其降解氯苯的潜力

摘要 本研究考察了生物炭的性质及其在降解氯苯方面的潜在应用。生物炭来源于稻壳，在 N2 气氛中在 550 °C 下烧焦，这表明在环境大气中氯苯显着降解。扫描电子显微镜、X 射线衍射和拉曼光谱的结果表明，在生物炭上的无定形相中形成了排列不良的石墨烯堆叠。傅里叶变换红外光谱和电子顺磁共振表明生物炭上存在对苯二酚 - 醌部分，可以诱导活性氧的产生并促进氯苯的降解。此外，过氧化氢和羟​​基自由基是通过生物炭上的酚羟基氧化还原氧而产生的，这是氯苯降解的原因。此外，与传统的芬顿反应相比，生物炭系统中检测到更多类型的氯苯降解中间产物，这可能归因于氯苯与生物炭表面活性氧之间的界面反应。本研究的发现将为生物炭在有机污染物去除中的应用提供新的见解。这可能归因于氯苯与生物炭表面活性氧之间的界面反应。本研究的发现将为生物炭在有机污染物去除中的应用提供新的见解。这可能归因于氯苯与生物炭表面活性氧之间的界面反应。本研究的发现将为生物炭在有机污染物去除中的应用提供新的见解。