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Efficient Removal of Arsenic (V) from Water Using Steel‐Making Slag
Author(s) -
Chakraborty A.,
Sengupta A.,
Bhadu M. K.,
Pandey A.,
Mondal A.
Publication year - 2014
Publication title -
water environment research
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.356
H-Index - 73
eISSN - 1554-7531
pISSN - 1061-4303
DOI - 10.2175/106143014x13975035524907
Subject(s) - arsenic , adsorption , leaching (pedology) , chemistry , freundlich equation , slag (welding) , phosphate , langmuir , calcium carbonate , calcium , kinetics , calcium silicate , inorganic chemistry , metallurgy , materials science , geology , organic chemistry , composite material , physics , quantum mechanics , soil science , soil water
This study describes the potential use of steel‐making slag as an arsenic‐removal medium. Systematic analysis of slag material revealed a composition of oxides of calcium, iron, silicon, and phosphorous. Under the experimental conditions of this study, the equilibrium time was shown to be 2 hours, and the removal capacity to be 99%, with an adsorbent loading capacity of 1.25g/l. The adsorption kinetics were shown to follow a pseudo‐second‐order rate equation, and the adsorption isotherm closely followed both the Langmuir and Freundlich isothermic models. Variations in solution pH levels demonstrated that with a decrease in the initial solution pH, the adsorption capacity decreases. This is attributed to the leaching of silica and phosphate from the slag to the solution, which imparted a competing effect for adsorption sites. However, with an alkaline pH, such leaching was reduced, and due to formation of calcium carbonate from the leached calcium from the slag material, the arsenic removal efficiency increased as it was co‐precipitated with calcium carbonate.