Abstract
The currentsorbents for Cr (VI) removal from industrial wastewater have some unsatisfactory performances in terms of activity, regeneration, and safe disposal of adsorbed Cr species. Herein, sulfureted maghemite (γ-Fe2O3) was developed as a regenerable sorbent to recover Cr (VI). Sulfureted γ-Fe2O3 exhibited superior ability for Cr (VI) removal with a rate of 10.1 mg g−1h−1 and capacity of 74.0 mg g−1. Cr (VI) removal by sulfureted γ-Fe2O3 depended on the quantities of FeS and FeS2, as well as the amounts of adsorbed Cr (VI) and H+. Although the quantities of FeS and FeS2 on sulfureted γ-Fe2O3 notably decreased after regeneration, the adsorption of Cr (VI) and H+ onto sulfureted γ-Fe2O3 were significantly promoted after regeneration due to the formation of Cr(OH)3 and Fe(OH)3. Hence, the Cr (VI) removal activity of sulfureted γ-Fe2O3 was notably promoted after regeneration. Cr (VI) in industrial wastewater was gradually enriched on sulfureted γ-Fe2O3 as Cr(OH)3 through multiple adsorptions, and it can be used as a raw material with chromite to refine Cr as the chemical component of spent sulfureted γ-Fe2O3 was similar to that of chromite. Therefore, sulfureted γ-Fe2O3 may be a promising sorbent for Cr (VI) removal from industrial wastewater.
Sign-in/Register to access full text options 
Free) 
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 call
