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Photocatalytic removal of methylmercury assisted by UV-A irradiation

Paper ID Volume ID Publish Year Pages File Format Full-Text
47944 46486 2009 5 PDF Available
Title
Photocatalytic removal of methylmercury assisted by UV-A irradiation
Abstract

The present study evaluates the removal of methylmercury from aqueous solutions by TiO2 photocatalysis using UV-A irradiation. To assess the weight of the variables pH and amount of catalyst, a factorial design was used when planning the experiments. Methylmercury was determined by the difference between total mercury and inorganic mercury. The optimal conditions for methylmercury removal are low amounts of catalyst and an alkaline pH. Under optimal conditions, more than 95% of methylmercury removal was achieved after 2 min irradiation. Methylmercury can be removed in the presence of nitrogen or oxygen under different mechanism pathways. In the presence of nitrogen, the reaction proceed by forming water soluble compounds, such as methanol or more oxidised moieties. In the presence of oxygen, the reaction slows due to competition between oxygen and Hg (II) for conduction band electrons. In saturated oxygen solutions, the main reaction products were CH4, CO and CO2. To recover the reduced mercury released from the reactor, copper powder was arranged in a trapping device amalgamating Hg0, achieving above 90% of retention yield.

Keywords
CH3HgCl; Mercury reduction; Methylmercury; Photocatalysis; TiO2
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Photocatalytic removal of methylmercury assisted by UV-A irradiation
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis B: Environmental - Volume 90, Issues 1–2, 25 July 2009, Pages 115–119
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis
Get Full-Text Now
Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
Full-text PDF Download
Online Support
Any Questions? feel free to contact us