Abstract
Al-peroxymonosulfate (PMS) system is an efficient way for removal of pollutants in aqueous solution. Al surface passive oxide film is a barrier to impede the electron transfer from inner metal Al to outside, whose compositions and phase structures are changed in different environment such as moisture or after recycling. In this work, for the first time, the effect of Al surface oxide structures on oxidability of Al-PMS system and its efficiency for removal of organic pollutant was investigated. It was found that if the passive oxide film on Al particles is hydrated and becomes hydroxides, the efficiency of Al-PMS system for degradation of bisphenol A (BPA) in aqueous solution decreases considerably, because the solubility of crystallized Al hydroxides is at least three orders of magnitude lower than that of amorphous Al oxides on pristine Al particles. Furthermore, the trace species in water have an influence on the hydration and structures of Al surface oxide film. For example, organics and F− ions in water will form complexes on Al particle surfaces and inhibit the hydration process, while Cl− ions corrode Al surface oxides and do not inhibit the hydration, based on the analyses of Al3+ ion concentration in their solution after BPA removal. It was also found that acid washing can remove the hydrated oxide film on Al surfaces and recover Al activity.
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.
