Optimisation of arsenate removal from water by an integrated ion-exchange membrane process coupled with Fe co-precipitation

Lopes, Mafalda Pessoa; Galinha, Cláudia F.; Crespo, João G.; Велизаров, Светлозар

doi:10.1016/j.seppur.2020.116894

Cited by 20 publications

(3 citation statements)

References 25 publications

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“…However, these methods are unsuccessful in the treatment of dissolved pollutants. 17 Different technologies such as ion exchange, 18,19 co-precipitation, 20 reverse osmosis, 21 coal combustion, 22 green methods, 23,24 electrocoagulation, 25 electrodeionization, 26 and membrane filtration 27 are used to remove arsenic from water but these techniques have lower removal efficiencies, produce large amounts of waste, are expensive and produce iron residues. 28 Adsorption is an effective technique to clean water and remove unwanted impurities from water.…”

Section: Introductionmentioning

confidence: 99%

Recent advances of magnetite nanomaterials to remove arsenic from water

Jain

2022

RSC Adv.

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Section: Introductionmentioning

confidence: 99%

Recent advances of magnetite nanomaterials to remove arsenic from water

Jain

2022

RSC Adv.

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“…The most suitable membrane was selected and was then used to set the other operating parameters (crossflow velocity, transmembrane pressure, and operating temperature), using a response surface methodology (RSM). Response surface methodology (RSM) is a multivariate regression tool based on statistical analysis, which allows the factors and response variables to be correlated using regression models that are optimised for each response studied [34,35]. RSM is combined with design of experiments (DoE) to find an optimal response.…”

Section: Introductionmentioning

confidence: 99%

“…RSM is combined with design of experiments (DoE) to find an optimal response. DoE introduces variation in the independent factors that directly affect the variation of responses and allows a reduction in the number of experiments required to develop a model [35]. In this work, this statistical method was used to establish the correlation between the factors (operating temperature, crossflow velocity, and transmembrane pressure), and the responses (rejection of ferulic acid, retention of arabinoxylans, measured through the viscosity of retentate stream, and permeance), in order to define the best ultrafiltration conditions for an efficient separation of ferulic acid from arabinoxylans, while maintaining a good permeance.…”

Section: Introductionmentioning

confidence: 99%

Effect of Ultrafiltration Operating Conditions for Separation of Ferulic Acid from Arabinoxylans in Corn Fibre Alkaline Extract

et al. 2021

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Corn fibre, a co-product of the starch industry, is rich in compounds with high added value, such as ferulic acid and arabinoxylans, which are released during alkaline extraction. This work aims to optimise an efficient separation method for the recovery of these two compounds from a corn fibre alkaline extract, allowing an efficient valorisation of this co-product. Ultrafiltration was selected as separation method, due to its potential to fractionate these compounds. In order to minimise the loss of membrane permeance, due to mass transfer limitations caused by the high arabinoxylan viscosity, the impact of relevant ultrafiltration operating parameters (membrane molecular weight cut-off, fluid dynamics conditions, transmembrane pressure, and operating temperature) were evaluated. A Nadir UP 150 membrane was found to be an adequate choice, allowing for an efficient separation of ferulic acid from arabinoxylans, with null rejection of ferulic acid, a high estimated rejection of arabinoxylans 98.0% ± 1.7%, and the highest permeance of all tested membranes. A response surface methodology (RSM) was used to infer the effect of ultrafiltration conditions (crossflow velocity, transmembrane pressure and operating temperature) on the rejection of ferulic acid, retention of arabinoxylans (assessed through apparent viscosity of the retentate stream), and permeance. Through mathematical modelling it was possible to determine that the best conditions are the highest operating temperature and initial crossflow velocity tested (66 °C and 1.06 m.s−1, respectively), and the lowest transmembrane pressure tested (0.7 bar).

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Synthesis and physicochemical characterization of sulfonated polyketone ion exchange membrane using response surface methodology

Lee

Kim

Lim

et al. 2022

Polymers for Advanced Techs

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In this study, the process parameters used for the synthesis of sulfonated polyketone in the preparation of ion exchange membranes were optimized using the response surface methodology (RSM). Sulfonated polyketone ion exchange membranes were prepared by varying three process parameters: concentration of the sulfonating agent, reaction temperature, and reaction time. The properties of the prepared membranes, such as the degree of sulfonation, water uptake, swelling ratio, ion exchange capacity, and mechanical properties, were evaluated. According to the RSM analysis, the degree of sulfonation and swelling ratio of the sulfonated polyketone ion exchange membranes were predominantly affected by the concentration of the sulfonating agent, whereas the water uptake and mechanical properties were predominantly affected by the reaction temperature. The optimal process parameters determined for the synthesis of sulfonated polyketone in the ion exchange membranes are: sulfonating agent concentration of 0.4 wt.%, reaction temperature of 40°C, and reaction time of 62.6 min, which resulted in an ion exchange capacity of 0.88 meq/g. Based on these results, it was concluded that the analysis using RSM is very useful because the experiments and statistical analysis showed similar results.

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Optimisation of arsenate removal from water by an integrated ion-exchange membrane process coupled with Fe co-precipitation

Cited by 20 publications

References 25 publications

Recent advances of magnetite nanomaterials to remove arsenic from water

Recent advances of magnetite nanomaterials to remove arsenic from water

Effect of Ultrafiltration Operating Conditions for Separation of Ferulic Acid from Arabinoxylans in Corn Fibre Alkaline Extract

Synthesis and physicochemical characterization of sulfonated polyketone ion exchange membrane using response surface methodology

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