Degradation of orange II by Fe@Fe2O3 core shell nanomaterials assisted by NaHSO3. (April 2020)

• Record Type: Journal Article
• Authors: Yang, Yan; Sun, Mengying; Zhou, Jin; Ma, Jianfeng; Komarneni, Sridhar
• Is Part Of: Chemosphere. Volume 244(2020)
• Publication Date: 2020-04
• Subjects: Fe@Fe2O3 -- Core shell nanomaterials -- Bisulfite -- Rapid electron transfer; Pollution -- Periodicals; Pollution -- Physiological effect -- Periodicals; Environmental sciences -- Periodicals; Atmospheric chemistry -- Periodicals; 551.511
• DOI: 10.1016/j.chemosphere.2019.125588
• Languages: English
• ISSNs: 0045-6535

Abstract

Abstract: Fe@Fe2 O3 core shell nanomaterials with different Fe2 O3 shell thickness were synthesized and the Fe@Fe2 O3 /NaHSO3 Fenton-like system was used for the decomposition of Orange II. The consequences are compared with traditional Fenton Fe@Fe2 O3 /H2 O2 system. The Fe@Fe2 O3 /NaHSO3 system showed extremely good applicability under both strongly acidic and alkaline conditions. The new Fe@Fe2 O3 -(2)/NaHSO3 system led to more than 99% degradation in 30 s when the pH was 3, which indicated that the Fe@Fe2 O3 material was not corroded during the process even under strongly acidic condition. The above Fe@Fe2 O3 -(2) material was prepared from nano-zero-valent iron aged in solution for 2 h to synthesize the Fe2 O3 shell. The reaction mechanism of Fe@Fe2 O3 /NaHSO3 Fenton-like system was also concluded. The oxidation efficiency was highly improved due to rapid electron transfer between Fe core and Fe2 O3 shell, which promoted the direct recycling of ≡Fe 3+ and ≡Fe 2+ and thus accelerated the generation of SO4 − and OH radicals. Graphical abstract: Image 1 Highlights: Fe@Fe2 O3 core shell nanomaterials with different Fe2 O3 thickness were synthesized. Fe@Fe2 O3 /NaHSO3 degraded Orange II efficiently under a wide range of pH conditions. Fe@Fe2 O3 /NaHSO3 system led to >99% degradation of Orange II in 30 s at pH 3. Electron transfer from Fe core and Fe2 O3 shell promoted recycling of Fe 3+ and Fe 2+ . Orange II dye was degraded by SO4 − and OH radicals generated in this system.