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研究报告

Enhanced Fenton-like catalytic performance of FeOOH by biochar and its mechanism

摘要：采用醇助水热法制备了新型生物质炭修饰的α-FeOOH类芬顿催化剂（BC-FeOOH），并通过扫描电子显微镜（SEM）、透射电子显微镜（TEM）、X射线衍射（XRD）、傅里叶变换红外光谱（FTIR）对催化剂进行了表征，证明生物质炭（BC）成功引入到α-FeOOH中.以罗丹明B（RhB）为目标污染物，考察了BC修饰量、催化剂及H₂O₂投加量对其催化效率的影响.结果表明，BC的引入可以极大地提高FeOOH的类芬顿催化性能.在pH中性、催化剂投加量0.6 g·L^-1、H₂O₂初始浓度10 mmol·L^-1的条件下，BC-FeOOH（22.2% BC）对RhB的降解率可达到90%，重复利用5次活性仍可保持在80%左右，且铁离子溶出浓度仅为0.08 mg·L^-1.进一步通过ESR在不同体系中的测试结果表明，BC的引入不仅可促进H₂O₂有效还原分解产生更多的羟基自由基（·OH），而且增强了催化剂与污染物RhB的相互作用，促使污染物失电子氧化降解，从而提高了FeOOH的催化活性及催化稳定性.

Abstract：A novel biochar-modified α-FeOOH Fenton catalyst (BC-FeOOH) was prepared by alcohol-assisted hydrothermal method. Scanning electron microscope (SEM), transmission electron microscope (TEM), X-ray diffraction (XRD), and fourier transform infrared spectroscopy (FTIR) was used to characterize the catalyst, proving that the biochar (BC) was successfully introduced into α-FeOOH. With Rhodamine B (RhB) as a target pollutant, the effects of BC modification amount, catalyst and H₂O₂ addition amount on its catalytic efficiency were investigated. The results showed that the introduction of BC could greatly improve the Fenton-like catalytic performance of FeOOH. Under the conditions of neutral pH, catalyst dosage of 0.6 g·L^-1 and initial H₂O₂ concentration of 10 mmol·L^-1, the degradation rate of RhB over BC-FeOOH (22.2% BC) could reach up to 90%. And its activity remained about 80% after five reaction cycles, while the leaching concentration of iron ion was only 0.08 mg·L^-1. Furthermore, the ESR results in different systems showed that the introduction of BC not only promoted the effective reduction of H₂O₂ to generate more hydroxyl radicals (·OH), but also enhanced the interaction between the catalyst and the pollutant RhB to accelerate the electron-loss oxidation of the pollutant, resulting in the high catalytic activity and stability of FeOOH.