Honeycomb-like magnetic cornstalk for Cr(VI) removal and ammonium release. (November 2019)

• Record Type: Journal Article
• Authors: Ren, Jingya; Zhang, Guilong; Wang, Dongfang; Cai, Dongqing; Wu, Zhengyan
• Is Part Of: Bioresource technology. Volume 291(2019)
• Publication Date: 2019-11
• Subjects: Cornstalk -- Hexavalent chromium -- Ammonium sulfite -- High energy electron beam; Biomass -- Periodicals; Biomass energy -- Periodicals; Bioremediation -- Periodicals; Agricultural wastes -- Periodicals; Factory and trade waste -- Periodicals; Organic wastes -- Periodicals; Bioénergie -- Périodiques; Déchets agricoles -- Périodiques; Déchets industriels -- Périodiques; Déchets organiques -- Périodiques; Déchets (Combustible) -- Périodiques; 662.88
• DOI: 10.1016/j.biortech.2019.121856
• Languages: English
• ISSNs: 0960-8524

Abstract

Graphical abstract: Highlights: A honeycomb-like magnetic composite named as OPCS-AS@PVA-Fe3 O4 was fabricated. OPCS-AS@PVA-Fe3 O4 consisted of cornstalk, (NH4 )2 SO3, polyvinyl alcohol and Fe3 O4 . OPCS-AS@PVA-Fe3 O4 could reduce Cr(VI) to Cr(III) and adsorb Cr(III). OPCS-AS@PVA-Fe3 O4 could release ammonium to favor plant growth. OPCS-AS@PVA-Fe3 O4 was stable against coexisting ions. Abstract: In this work, cornstalk (CS) was irradiated by high energy electron beam to obtain honeycomb-like porous CS (PCS). The PCS was loaded with ammonium sulfite (AS) and then coated by polyvinyl alcohol (PVA)-Fe3 O4 to obtain PCS-AS@PVA-Fe3 O4 . The PCS-AS@PVA-Fe3 O4 could reduce hexavalent chromium (Cr(VI)) to trivalent chromium (Cr(III)) by SO3 2−, then the Cr(III) combined with PCS-AS@PVA-Fe3 O4 through hydrogen bonds. The resulting PCS-AS@PVA-Fe3 O4 /Cr with a high magnetism could be conveniently separated from water via a magnet. PCS-AS@PVA-Fe3 O4 /Cr showed a high performance on controlling Cr(VI) migration in soil and uptake by plant. Meanwhile, ammonium could be released from PCS-AS@PVA-Fe3 O4, favoring plant growth. Therefore, this work not only provides a promising and low-cost approach to remove Cr(VI) and promote plant growth simultaneously, but also provides a new route for CS recycling, which might have a potential application value.