研究报告

  • 张晓,胡春,张丽丽,石宝友.生物质炭强化FeOOH类芬顿催化性能及其机制[J].环境科学学报,2020,40(11):3895-3904

  • 生物质炭强化FeOOH类芬顿催化性能及其机制
  • Enhanced Fenton-like catalytic performance of FeOOH by biochar and its mechanism
  • 基金项目:国家重点研发计划(No.2016YFA0203200);国家自然科学基金(No.51538013,51838005)
  • 作者
  • 单位
  • 张晓
  • 广州大学大湾区环境研究院, 珠江三角洲水质安全与保护教育部重点实验室, 广州 510006
  • 胡春
  • 广州大学大湾区环境研究院, 珠江三角洲水质安全与保护教育部重点实验室, 广州 510006
  • 张丽丽
  • 中国科学院生态环境研究中心, 中国科学院饮用水科学与技术重点实验室, 北京 100085
  • 石宝友
  • 中国科学院生态环境研究中心, 中国科学院饮用水科学与技术重点实验室, 北京 100085
  • 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.

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