Accelerated Fe3+/Fe2+ cycle using atomic H* on Pd/Al2O3: A novel mechanism for an electrochemical system with particle electrode for iron sludge reduction in the Fe2+/peroxydisulfate oxidation process

CORC > 生态环境研究中心 > 中国科学院生态环境研究中心 > 环境水质学国家重点实验室

	*Accelerated Fe3+/Fe2+ cycle using atomic H on Pd/Al2O3: A novel mechanism for an electrochemical system with particle electrode for iron sludge reduction in the Fe2+/peroxydisulfate oxidation process**
	Zeng, Huabin; Zhao, Xu; Zhao, Feiping; Park, Yuri; Sillanpaa, Mika
刊名	CHEMICAL ENGINEERING JOURNAL
	2020-02-15
卷号	382 页码:1-8
关键词	Fe2+/PDS process Pd/Al2O3 Atomic H* Iron cycle Iron sludge reduction
ISSN号	1385-8947
英文摘要	The high cost associated with the disposal of iron sludge in Fe2+ activated oxidation systems significantly limits their widespread use. In this study, we constructed a trace iron-based peroxydisulfate (PDS) oxidation system (Pd-EFP) using Pd/Al2O3 as the particle electrode and externally added PDS as an oxidant. At an initial solution pH of 3.0 and a current density of 3.33 mA/cm(2), with the addition of 10mM PDS, 50 mg Pd/Al2O3, and 2 mg/L Fe ions, 80.12% of 180 mu M benzoic acid (BA) was degraded within 120 min. The Pd/Al2O3 catalyst provided sufficiently large surface area for atomic H* production from the adsorption of electrogenerated H-2 or H+ conversion via electro-induction on the Pd/Al2O3 surface, which subsequently accelerated the transformation from Fe3+ to Fe2+. Using this method, organics could be degraded by both SO4 center dot- and center dot OH via the Fe2+ -activated PDS process. In the Pd-EFP process, the optimal dosage of Fe ions was determined to be 36 mu M (2 mg/L). Correspondently, the optimal current density and PDS concentration in the Pd-EFP system were 3.33 mA/cm(2) and 20 mM, respectively. Furthermore, degradation of BA was efficiently promoted by the N-2 atmosphere, which could steer the reaction on the surface of Pd/Al2O3 in the right direction toward Fe3+ reduction by atomic H*, by dispelling accumulated H-2 above the reaction liquid and suppressing oxygen reduction. Finally, the Pd/Al2O3 catalyst was found to be durable in the Pd-EFP system according to reusability experiments and X-ray diffraction patterns of the fresh and used Pd/Al2O3 catalyst. This research provides an environmentally benign system for recycling Fe3+ in Fe2+/PDS processes and for suppressing iron sludge production.
内容类型	期刊论文
源URL	[http://ir.rcees.ac.cn/handle/311016/44897]
专题	生态环境研究中心_环境水质学国家重点实验室
推荐引用方式 GB/T 7714	Zeng, Huabin,Zhao, Xu,Zhao, Feiping,et al. Accelerated Fe3+/Fe2+ cycle using atomic H* on Pd/Al2O3: A novel mechanism for an electrochemical system with particle electrode for iron sludge reduction in the Fe2+/peroxydisulfate oxidation process[J]. CHEMICAL ENGINEERING JOURNAL,2020,382:1-8.
APA	Zeng, Huabin,Zhao, Xu,Zhao, Feiping,Park, Yuri,&Sillanpaa, Mika.(2020).Accelerated Fe3+/Fe2+ cycle using atomic H* on Pd/Al2O3: A novel mechanism for an electrochemical system with particle electrode for iron sludge reduction in the Fe2+/peroxydisulfate oxidation process.CHEMICAL ENGINEERING JOURNAL,382,1-8.
MLA	Zeng, Huabin,et al."Accelerated Fe3+/Fe2+ cycle using atomic H* on Pd/Al2O3: A novel mechanism for an electrochemical system with particle electrode for iron sludge reduction in the Fe2+/peroxydisulfate oxidation process".CHEMICAL ENGINEERING JOURNAL 382(2020):1-8.