Abstract
The oxidation of As(III) to As(V) followed by precipitation and adsorption is thought to be the most effective process for removal of arsenic in industrial wastewater. In this work, the oxidation of As(III) to As(V) with ozone was carried out in an acidic solution. After oxidation, arsenic was removed by precipitation in an iron (III) sulfate system under ambient pressure at 90°C in acid. Batch experimental results show that ozone is quite effective in oxidizing As(III) at low pH. And more than 90% of 5g/l As(III) was removed from the acidic solution by precipitation with Fe2(SO4)3 in 7-8 hours.
Highlights
The toxic behavior of arsenic is receiving increased attention as the arsenic pollution has been reported worldwide
Ozone applications have been reported for treatment of wastewater and water, but very few studies are for oxidation of As [6,7,8,9,10]
The ozone oxidation was effective in an acidic solution and the concentration of As(III) decreased whereas the concentration of As(V) increased in the solution after oxidation. 60% of 5 g/l As(III) oxidized below 10 min and more than 99% of As(III) was oxidized within 25 min in an acidic solution
Summary
The toxic behavior of arsenic is receiving increased attention as the arsenic pollution has been reported worldwide. Under natural conditions As is mostly found in inorganic forms as trivalent arsenite (As(III)) or as oxyanions of pentavalent arsenate (As(V)). In comparison with As(V), As(III) is high mobile and more difficult to be removed from the aqueous solution. It is necessary to oxidize the trivalent arsenic to its pentavalent state before the arsenic removal. The most characteristic chemical properties of ozone are its strong oxidizing and high standard redox potential according to the reaction conditions. It is strong oxidizing nature and its tendency to transfer an O atom with coproduction of O2 [4]. The standard redox potentials in acid (1) and in alkaline (2) solutions are the following reactions
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
