Hydrogen sulfide is a highly odorous, toxic, and corrosive air pollutant. A considerable amount of H2S
is produced by industrial processes such as petrochemical refining, wastewater treatment, food preparation, paper
and pulp manufacturing and fuels treatments. Because the
human threshold exposure limit to H2S is 10 ppm for 7-8 h periods, excess H2S must be removed for reasons of
health and safety. The physical and chemical processes that have been used to
remove H2S from waste gas and wastewater include activated carbon absorption, ozone oxidation, and incineration
. The major drawbacks of these conventional methods are their relatively high energy requirements, treatment costs, and high disposal costs.