Efficient Removal of Arsenic (V) from Water Using Steel‐Making Slag. (1st June 2014)

• Record Type: Journal Article
• Authors: Chakraborty, A.; Sengupta, A.; Bhadu, M. K.; Pandey, A.; Mondal, A.
• Is Part Of: Water environment research. Volume 86:Number 6(2014)
• Page Start: 524
• Page End: 531
• Publication Date: 2014-06-01
• Subjects: steel‐making slag -- arsenic removal -- adsorption -- leaching -- low‐cost adsorbent; Water quality management -- Periodicals; Water -- Purification -- Periodicals; Water -- Pollution -- Periodicals; Water -- Pollution; Water -- Purification; Water quality management; Sewage; Water Pollution; Periodicals; Electronic journals; Periodicals; 628.16
• DOI: 10.2175/106143014X13975035524907
• Languages: English
• ISSNs: 1061-4303

Abstract

ABSTRACT: : 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.