Chitosan-stabilized FeS magnetic composites for chromium removal: Characterization, performance, mechanism, and stability. (15th June 2019)

• Record Type: Journal Article
• Authors: Zhang, Hao; Peng, Liang; Chen, Anwei; Shang, Cui; Lei, Ming; He, Kai; Luo, Si; Shao, Jihai; Zeng, Qingru
• Is Part Of: Carbohydrate polymers. Volume 214(2019)
• Page Start: 276
• Page End: 285
• Publication Date: 2019-06-15
• Subjects: Chitosan -- Iron sulfide -- Adsorption -- Reduction -- Chromium -- Stability; Polysaccharides -- Periodicals; Polysaccharides -- Periodicals; Polysaccharides -- Périodiques; Electronic journals; 547.78
• DOI: 10.1016/j.carbpol.2019.03.056
• Languages: English
• ISSNs: 0144-8617

Abstract

Graphical abstract: Highlights: Chitosan can be used to stabilize FeS and increase Cr(VI) adsorption and reduction. The stabilization technique prevented FeS oxidation and enhanced Cr(VI) removal. Adsorption/reduction depends on initial Cr(VI) concentration and composite dosage. The MC-FeS composite presented high stability against aging. MC-FeS performed well in typical natural water and long-term reaction system. Abstract: Chitosan-stabilized FeS magnetic (MC-FeS) composites were successfully prepared to address the easily oxidization of FeS and enhance Cr(VI) removal from water. Results showed that the MC-FeS composites enhanced the Cr(VI) removal capacity as compared to bare FeS. Further investigation using X-ray photoelectron spectroscopy showed that FeOOH, S8, Cr2 O3, Cr2 S3, and a Fe(III)-Cr(III) complex were apparently introduced by Cr(VI), Fe(II), and S(−II), respectively. The sorption kinetics could be interpreted using a pseudo-second-order kinetic model, whereas the isotherms were simulated using the Redlich‒Peterson isotherm model indicating Cr(VI) removal by MC-FeS composites was a hybrid chemical reaction‒sorption process. In addition, the MC-FeS composite presented high stability against aging and performed well in a long-term reaction system and typical natural water environment. The effective performance of MC-FeS composites shows their great potential in wastewater remediation contaminated by heavy metals.