Chandrasekara Pillai, K. and Raju, T. and Chung, S.J. and Moon, I.S. (2009) Removal of H2S using a new Ce(IV) redox mediator by amediated electrochemical oxidation process. Journal of Chemical Technology and Biotechnology, 84 (3). pp. 447-453.

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Abstract

BACKGROUND: Hydrogen sulfide (H2S) from industrial activities and anaerobic manure decomposition in commercial livestock animal operations is an offensivemalodorous and toxic gas even in small concentrations, causing serious discomfort and health and social problems. The objective of this study was to employ for the first time a novel, attractive, low cost, environmentally benign mediated electrochemical oxidation (MEO) process with Ce(IV) as the redox catalyst forH2S gas removal from anH2S–air feed mixture. RESULTS: The influence of liquid flow rate (QL) from2–4 Lmin−1, gas flow rate (QG) from 30–70 L min−1, H2S concentration in theH2S–air feed mixture from 5–15 ppm, and Ce(III) pre-mediator concentration in the electrochemical cell from 0.1–1 mol L−1 on H2S removal efficiency were investigated. Both liquid and gas flow rates influenced the removal efficiencies, but in opposite directions.Nearly 98%H2S removal was achievedwhen the concentration of Ce(IV)mediator ion in the flowing scrubbing liquid reached 0.08mol L−1. CONCLUSIONS: The new MEOmethod proved promising for H2S removal, achieving high removal efficiency. Integration of the electrochemical cell with the scrubber set-up ensured continuous regeneration of the mediator and its repeated reuse for H2S removal, avoiding use of additional chemicals. Since the processworks at room temperature and atmospheric pressure utilizing conventional transition metal oxide electrodes more commonly used in industrial applications, it is also safe and economical.

Item Type:	Article
Uncontrolled Keywords:	deodorization; H2S removal;mediated electrochemical oxidation process; Ce(IV)/Ce(III) redox system; wet scrubbing
Subjects:	Electroorganic
Divisions:	UNSPECIFIED
Depositing User:	TTBD CECRI
Date Deposited:	08 Apr 2012 14:51
Last Modified:	08 Apr 2012 14:51
URI:	http://cecri.csircentral.net/id/eprint/426

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