Removal of arsenic(v) from aqueous solutions using sulfur-doped Fe3O4 nanoparticles. Issue 71 (5th December 2018)

• Record Type: Journal Article
• Authors: Liu, Junhui; Kong, Long; Huang, Xueqiong; Liu, Min; Li, Liang
• Is Part Of: RSC advances. Volume 8:Issue 71(2018)
• Page Start: 40804
• Page End: 40812
• Publication Date: 2018-12-05
• Subjects: Chemistry -- Periodicals; 540.5
• DOI: 10.1039/c8ra08699k
• Languages: English
• ISSNs: 2046-2069

Abstract

Abstract : Magnetic Fe3 O4 :S NPs presented a much better As(v ) adsorption performance than undoped Fe3 O4 NPs due to sulfur doping. Abstract : In this study, magnetic sulfur-doped Fe3 O4 nanoparticles (Fe3 O4 :S NPs) were applied as adsorbents for the removal of As(v ). Fe3 O4 :S NPs were fabricated by a two-step route, which included low-temperature mixing and high-temperature sintering. The as-prepared Fe3 O4 :S NPs could effectively remove As(v ) under a wide pH range of 2–10 and presented a high As(v ) adsorption capacity of 58.38 mg g −1, which was much better than undoped Fe3 O4 nanoparticles (20.24 mg g −1 ). Adsorption experiments exhibited a pseudo-second-order model of adsorption kinetics and a Langmuir isotherm model of adsorption isotherms. Additionally, the coexisting ions such as NO3 −, SO4 2−, and CO3 2− had no significant effect on As(v ) adsorption and the adsorbent worked well in actual smelting wastewater. XPS and FTIR spectra of Fe3 O4 :S NPs before and after As(v ) adsorption showed that Fe–OH groups played a significant role in the adsorption mechanisms. Moreover, the magnetic Fe3 O4 :S NPs adsorbents after adsorption could be rapidly separated from wastewater with an external magnetic field. Therefore, Fe3 O4 :S NPs could be an ideal candidate for the removal of As(v ) from water.