Abstract
The fate of arsenic in the water environment is of great concern. Here, the influences of oxalic acid and UV light illumination on the dissolution of naked ferrihydrite (Fhy), Fhy loaded with As(V) [Fhy*-As(V)], as well as the fate of As(V) at pH 3.0 were studied. With the assistance of oxalic acid, complexes of Fe(III)-oxalic acid produced on Fhy/Fhy*-As(V) were reduced to Fe(II)-oxalic acid by photo-induced electrons under UV light irradiation. UV light has nearly no impact on the release of As(V) in the system of Fhy*-As(V) without the assistance of oxalic acid. Nevertheless, in the existence of oxalic acid, UV light illumination resulted in the contents of liberated As(V) decreased by 775–1300% compared to that without light. Considering the coexistence of As(V), oxalic acid as well as iron oxides in aquatic environments, the present study revealed that UV illumination could enhance the retention of As(V) on Fhy in the acidic water environment containing oxalic acid.
Highlights
In aquatic environments, arsenic (As) is an omnipresent toxic pollutant and mainly occurs as arsenite [As(III)] and arsenate [As(V)] with inorganic forms [1]
The present study focused on understanding the impacts of oxalic acid and fixed As(V) amount on the light-triggered dissolution of Fhy, and the mechanism of As(V) migration involved in this photodissolution process
Fhy used in the present work was the 2-line ferrihydrite, and it was prepared by applying the method developed by Cornell and Schwartzman [12]
Summary
Arsenic (As) is an omnipresent toxic pollutant and mainly occurs as arsenite [As(III)] and arsenate [As(V)] with inorganic forms [1]. On account of the serious toxicity of As, the United States Environmental Protection Agency (USEPA) in 2001 lowered the guideline from 50 to 10 μg L−1 for total As in drinking water [5] To attain this stringent threshold, several technologies have been used to remove As from water, and these contain coagulation–flocculation [6], precipitation [6], ion exchange [6], membrane separation [6], electrochemical methods [6], photocatalysis [7,8], and adsorption [9,10]. The present study focused on understanding the impacts of oxalic acid and fixed As(V) amount on the light-triggered dissolution of Fhy, and the mechanism of As(V) migration involved in this photodissolution process
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.
