Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
5407991 | Journal of Molecular Liquids | 2017 | 39 Pages |
Abstract
The presence of high concentration of As(III) (arsenite) and As(V) (arsenate) in water system creates severe health problems to the human being and other aquatic animals. In this research, a novel Fe3O4/CSAC adsorbent was prepared by the thermal method using cigarette soot activated carbon (CSAC) as a template. Different instrumental techniques like XRD, SEM, EDX, TEM, VSM, BET, Zeta potential and FTIR study were used to confirm the formation of Fe3O4/CSAC. This material showed high surface area (575.604Â m2/g), low pore size (6.8Â nm), small particle size (less than 10Â nm) and good magnetic properties (10.77Â emu/g), which made the material highly effective for arsenic removal. The adsorption of arsenic was highly pH dependent and 91% and 93% of As(III) and As(V) were removed by this adsorbent at pHÂ 7 and 3. The adsorption process followed the Langmuir isotherm model with the uptake capacities of 80.99 and 107.96Â mg/g for As(III) and As(V), respectively. The adsorption data were best fitted to the pseudo second order kinetics model with the rapid adsorption in just 90Â min. In presence of Clâ, NO3â, SO42Â â, CO32- and PO43Â â anions also, the Fe3O4/CSAC showed the significant removal of As(III) and As(V). About 89% and 91% of As(III) and As(V) were desorbed with 0.5Â M NaOH solution from Fe3O4/CSAC surface and the regenerated adsorbent can be used up to four consecutive cycles without any major decrease in removal efficiency. The hydroxyl groups on the Fe3O4/CSAC played a key role for the adsorption of As(III) and As(V). The Fe3O4/CSAC was found to be a good novel adsorbent for arsenic removal from the water system.
Keywords
Related Topics
Physical Sciences and Engineering
Chemistry
Physical and Theoretical Chemistry
Authors
Uttam Kumar Sahu, Sumanta Sahu, Siba Sankar Mahapatra, Raj Kishore Patel,