Extractive continuous extractor for chromium recovery: Chromium (VI) reduction to chromium (III) in sustainable emulsion liquid membrane process

Noah, Norul Fatiha Mohamed; Sulaiman, Raja Norimie Raja; Othman, Norasikin; Jusoh, Norela; Rosly, Muhammad Bukhari

doi:10.1016/j.jclepro.2019.119167

Cited by 44 publications

(12 citation statements)

References 39 publications

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“…On the other hand, both prediction and experimental results showed a similar trend wherein the extraction efficiency of chromium decreased when increasing the initial chromium concentration in the feed phase from 40 to 200 ppm. This can be due to the insufficient emulsion phase to treat the high concentration of solute ion from the feed phase (Noah et al, 2020). At a chromium concentration of 40 ppm, the extraction percentage is maximum.…”

Section: Effect Of Chromium Concentrationmentioning

confidence: 99%

Emulsion liquid membrane modeling for chromium removal from electroplating wastewater using TOMAC as a carrier

Othman

Noah

Sulaiman

et al. 2021

Water Environment Research

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Hexavalent chromium, emanating primarily from the electroplating industries, can be reduced to the less toxic trivalent variety by several methods, including emulsion liquid membrane (ELM). In this work, studies on the continuous removal of chromium from authentic electroplating wastewater by ELM are reported. The effects of treat ratio, external feed phase, and stripping agent concentration were examined. A mathematical boundary breakage model was used to study the extraction efficiency of chromium through the ELM process. The model representing the prediction of ELM extraction performance for chromium was validated through the comparison between the simulation and experimental results. The result showed the simulation model is found to be in good agreement with the experimental result. Almost 100% of 40 ppm chromium in the external feed phase was extracted within 3 to 5 min using 0.022 M TOMAC as extractant, 1.0 M acidic thiourea in the internal phase, and 1 to 5 of treat ratio. © 2021 Water Environment Federation • Practitioner Points• Hexavalent chromium, emanating primarily from electroplating industries, can be reduced to the less toxic trivalent using ELM process. • The developed method was tested for its applicability with predominant species of Cr 2 O 7 2− in real rinse electroplating wastewater. • The extraction efficiency (%) of Cr (VI) was almost 100% for 40 ppm Cr in the external feed phase within 3 to 5 min. • The result showed the simulation model is found to be in good agreement with the experimental result.

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Section: Effect Of Chromium Concentrationmentioning

confidence: 99%

Emulsion liquid membrane modeling for chromium removal from electroplating wastewater using TOMAC as a carrier

Othman

Noah

Sulaiman

et al. 2021

Water Environment Research

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“…During the last decade, many physical, chemical, and biological treatment methods have been used to remove chromium compounds from contaminated soils, sediments, and water. Conventional methods, such as chemical precipitation [ 21 , 22 ], adsorption [ 23 , 24 ], coagulation [ 25 ], ion exchange [ 26 , 27 ], and membrane separation [ 28 , 29 ] have been used to remove chromium-containing contaminants from industrial waste. Unfortunately, most of the methods listed above are only effective in removing chromium compounds from liquid media.…”

Section: Introductionmentioning

confidence: 99%

Immobilization of Hexavalent Chromium Using Self-Compacting Soil Technology

et al. 2022

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A study of immobilization of hexavalent chromium in the form of Na2CrO4 salt by self-compacting soils (SCS) is presented. Carbofill E additive was used as SCS binder. The efficiency of immobilization of Cr (VI) was evaluated by washing out chromium compounds from SCS samples. The influence of the nature of the soil and the content of Carbofill E and Na2CrO4 in the SCS samples on the efficiency of Cr (VI) immobilization was studied. It was found that the nature of the soil and the content of Carbofill E in the SCS samples affect the immobilization of Cr (VI). Moreover, increasing the Carbofill E content in SCS samples further increases Cr (VI) immobilization. X-ray diffraction studies of the samples with immobilized hexavalent chromium showed that part of the sample transforms from a readily soluble form of salt into oxide forms of chromium and calcium-chromium, which are practically insoluble in water.

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“…Recently, research has been performed to use ELM as a green and sustainable separation technology. Noah et al applied ELM for recovery of toxic Cr VI from electroplating wastewater and converted it to less toxic Cr III simultaneously through a sustainable continuous ELM extraction system [50]. Application of green diluents such as vegetable oils in ELM formulation is a new area in ELM development that has been recently applied for extraction and enrichment of reactive dyes [51,52].…”

Section: Introductionmentioning

confidence: 99%

Pertraction of Vanadium(V) from Dilute Acidic Media by an Emulsion Liquid Membrane Containing a Commercial Extractant

2022

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Emulsion liquid membrane (ELM) pertraction of VV ions from dilute acidic solution by using a mixture of di(2‐ethylhexyl)phosphoric acid (D2EHPA) and mono(2‐ethylhexyl)phosphoric acid (M2EHPA) was studied. First, solvent extraction of VV from an aqueous medium was performed, and the optimum feed pH and extractant concentration were obtained. Tributyl phosphate was used as modifier to increase membrane stability and decrease membrane swelling. The effects of diluent type, extractant concentration of the emulsifier concentration, stripping reagent concentration (sulfuric acid), organic phase/stripping phase volume ratio, emulsification time and speed, feed initial pH, agitation speed, temperature, and contact time on VV extraction efficiency and ELM stability were considered.

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Extractive continuous extractor for chromium recovery: Chromium (VI) reduction to chromium (III) in sustainable emulsion liquid membrane process

Cited by 44 publications

References 39 publications

Emulsion liquid membrane modeling for chromium removal from electroplating wastewater using TOMAC as a carrier

Emulsion liquid membrane modeling for chromium removal from electroplating wastewater using TOMAC as a carrier

Immobilization of Hexavalent Chromium Using Self-Compacting Soil Technology

Pertraction of Vanadium(V) from Dilute Acidic Media by an Emulsion Liquid Membrane Containing a Commercial Extractant

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