Ion exchange recovery of chromium (VI) and manganese (II) from aqueous solutions

Abstract

Sorption recovery of toxic ions -chromium (VI) and manganese (II) -from aqueous solutions with different acidity (0.001-0.5 M HCl) was investigated on cation and anion exchangers synthesized with long-chained cross-linking agents (LCA). The initial concentrations of Cr(VI) and Mn(II) were 1 g/L and 5 g/L, respectively. It was shown that the resins with LCA possess high ionic permeability due to the elasticity of polymeric skeleton. High selectivity and good kinetic properties of these sorbents allowed to achieve quantitative ($100%) recovery and separation of manganese (II) and chromium (VI) in counter-current columns, which results in the complete purification of solutions from toxicants (below the maximum permissible limits), whereas the valuable components (chromium and manganese) can be returned back to industrial process. ª 2015 The Authors. Production and hosting by Elsevier B.V. on behalf of King Saud University. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/).

Pollution of Water Sources from Agricultural and Industrial Effluents: Special Attention to NO3ˉ, Cr(VI), and Cu(II)

“…Ingesting large quantity of Cr(VI), either by human or animal, can be corrosive to the skin and eyes and causes stomach upsets and ulcers, convulsions, kidney and liver damage [72,73]. Allergic reactions consisting of severe redness and swelling of the skin have been noted.…”

“…Krishnani et al [95] reported that the maximum permissible limits of Cr(VI) to discharge into potable water, in land surface water, and industrial wastewater are 0.05, 0.1, and 0.25 mg/L, respectively. According to the Moroccan official bulletin (NM 03.7.001), the Russian federation [73], and the Indian standard [65,94], the maximum allowable limits for Cr in drinking and domestic water are 0.05 and 0.5 mg/L for Cr(VI) and Cr(III), respectively.…”

Synthesis of TiO2 on different substrates by chemical vapor deposition for photocatalytic reduction of Cr(VI) in water

“…Therefore, the development of an effective method to remove Cr(VI) from industrial wastewater is essential for water treatment. Various methods such as adsorption, reverse osmosis, ion exchange,, and electrocoagulation have been reported for the removal of Cr(VI) from water. However, these methods are sometimes expensive and often inefficient at low concentrations.…”

Efficient Removal of Cr(VI) from Aqueous Solution on the Hierarchical Porous N-Doped Carbon Derived from Soft Wood

“…So far, different techniques have been employed such as ion exchange, [12,18] membrane separation, [31] reductive deposition method, [7] adsorption, [8,20] and electrocoagulation process. [2,17] Recent years, adsorption method has drawn much attention for its easy operation, wide availability, and high efficiency.…”