Recovery of chromium (VI) from hazardous APV wastewater using a novel synergistic extraction system

Ying, Ziwen; Song, Yue; Wu, Guixuan; Ju, Yun; Sun, Xiangyu; Ren, Xiulian; Wei, Qifeng

doi:10.1016/j.scitotenv.2022.156278

Cited by 13 publications

(1 citation statement)

References 45 publications

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“…In the case of solvent extraction, the use of TOPO (solvation extractant), Cyanex 272 (alkylphosphinic acid extractant), and mixtures of both reagents have been described for the removal of this element from solutions [ 9 ], while the extraction and separation of vanadium(V) and chromium(VI) have also been investigated using amides of mixtures of amides and Cyanex 272 [ 10 , 11 , 12 ].…”

Section: Introductionmentioning

confidence: 99%

Transport of Chromium(VI) across a Supported Liquid Membrane Containing Cyanex 921 or Cyanex 923 Dissolved in Solvesso 100 as Carrier Phase: Estimation of Diffusional Parameters

Robla

2023

Membranes

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An investigation of chromium(VI) transport across a supported liquid membrane containing the phosphine oxides Cyanex 921 and Cyanex 923 dissolved in Solvesso 100 as carrier phases was carried out in batch operation mode. Chromium(VI) transport was investigated as a function of different variables: hydrodynamic conditions in the feed (1000–1600 min−1) and stripping (600–1500 min−1) phases, HCl (0.25–2 M) and indium (0.01–0.1 g/L) concentrations in the feed phase, and carrier (0.01 M–0.75 M) concentration in the membrane phase. Indium was recovered in the stripping phase using hydrazine sulphate solutions, and, at the same time, chromium(VI) was reduced to the less harmful Cr(III) oxidation state. Models describing the transport mechanism comprising a diffusion process through the feed aqueous diffusion layer, fast interfacial chemical reaction, and diffusion of the respective chromium(VI)–phosphine oxide complexes across the membrane were developed. The equations describing the rate of transport correlate the membrane permeability coefficient with diffusion and equilibrium parameters, as well as the chemical compositions of the respective metal–carrier phases. The models were used to calculate diffusional parameters for each metal–carrier system, and the minimum thickness of the feed boundary layer was calculated as 1 × 10−3 cm and 6.3 × 10−4 cm for the Cr(VI)-Cyanex 921 and Cr(VI)-Cyanex 923 systems, respectively.

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