Open AccessMagnetic FeS2/Fe3O4composites as adsorbents for chromium (VI) removal from aqueous solution
Author(s) -
Guobao Chen,
Yuanhang Lu,
Xinmin Zhang
Publication year - 2020
Publication title -
iop conference series. materials science and engineering
Language(s) - English
Resource type - Journals
eISSN - 1757-899X
pISSN - 1757-8981
DOI - 10.1088/1757-899x/782/2/022043
Subject(s) - chromium , aqueous solution , magnetite , adsorption , x ray photoelectron spectroscopy , composite number , hydrothermal circulation , nuclear chemistry , materials science , chemistry , analytical chemistry (journal) , chemical engineering , composite material , metallurgy , chromatography , engineering
In this study, novel magnetite composites FeS 2 /Fe 3 O 4 were facilely synthesized by a one-pot hydrothermal method. It is applied as an adsorbent for chromium (VI) removal from aqueous solution. The pyrite (FeS 2 ) and the magnetite (Fe 3 O 4 ) were also synthesized and compared. The analysis results of XRD, SEM and XPS confirmed the formation of FeS 2 /Fe 3 O 4 composite. The magnetic characterization revealed that the saturation magnetization value for FeS 2 /Fe 3 O 4 was 50.89 emu/g, which is helpful for the separation. The effects of the initial pH values, adsorbent dosage, contact time and reaction temperatures on the Cr (VI) removal by various materials were studied and contrasted in detail through experiments. It is found that the composite FeS 2 /Fe 3 O 4 had high removal ability for Cr (VI) at high pH. 86.1% of Cr (VI) removal efficiency was obtained when the pH value is at 12.0, the contact time is 3h and the temperature is controlled at 35 °C. FeS 2 component was inferred as the major contribution for the composite to the Cr (VI) removal. FeS2/Fe 3 O 4 displayed a promoted Cr (VI) removal efficiency with the increasing temperature and its absorption process is proved spontaneous.