Comparative study of arsenic(V) removal from aqueous solution using Aliquat-336 and 2-ethyl hexanol through emulsion liquid membrane

Srivastava, Ankit; Bhagat, Ankush; Sharma, Utkarsh; Dohare, Rajeev Kumar; Singh, Kanhaiya; Upadhyaya, Sushant

doi:10.1016/j.jwpe.2016.12.007

Cited by 29 publications

(10 citation statements)

References 18 publications

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“…These observations may be related to an increase in the membrane viscosity, which leads to the formation of larger globules. This increase in the diameter of the emulsion globules leads to a decrease in the interfacial area between the emulsions, and as a result, the extraction rate decreases [38] . Moreover, a thicker membrane can prevent the internal phase dispersion into the membrane phase [50,64] .…”

Section: Resultsmentioning

confidence: 99%

“…This increase in the diameter of the emulsion globules leads to a decrease in the interfacial area between the emulsions, and as a result, the extraction rate decreases. [38] Moreover, a thicker membrane can prevent the internal phase dispersion into the membrane phase. [50,64] Thus, the volume ratio of the internal phase to the membrane phase 1:1 was considered as the best ratio.…”

Section: Effect Of the Emulsion To Feed Ratiomentioning

confidence: 99%

“…considered the comparative extraction of As(V) ions from an aqueous solution using two extractants of Aliquat 336 and 2‐ethylhexanol. Their results showed that 2‐ethylhexanol acts as a better extractant, and the separation efficiency was obtained as 87.5 % [38] . Zhu et al.…”

Section: Introductionmentioning

confidence: 98%

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Removal of High Concentrations of Arsenite from Aqueous Solutions by the Emulsion Liquid Membrane Technique

Ghasemi,

Abdi,

Nasiri

2024

ChemistrySelect

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As(III) is a dangerous species that contaminates groundwater resources and therefore water purification from this element is necessary. In this study, the removal of As(III) was investigated by the emulsion liquid membrane (ELM) technique due to the high toxicity levels of this species. The effect of various parameters such as hydrochloric acid and arsenic concentration in the feed solution, emulsion to feed ratio, surfactant concentration and type of carrier was evaluated on the arsenic separation efficiency. The results showed that the best type of carrier in terms of emulsion stability and separation efficiency of arsenic ions was di‐(2‐ethylhexyl) phosphoric acid (D2EHPA), and its optimal concentration was about 5 % (v/v). In addition, paraffin as the organic solvent performed better than the mixture of paraffin and kerosene in the separation of As(III) ions. The optimal conditions were obtained at 8 and 0.1 M HCl concentrations for the feed and the internal phases, respectively. Also, the emulsion to feed ratio of 1 : 4.5, the volume ratio of the internal phase to the membrane phase of 1 : 1 and the surfactant concentration of 5 % (v/v) led to achieving the maximum removal of arsenic ions. This work presents a broad perspective of removing As(III) ions from wastewater by carefully examining the parameters influencing the separation of this hazardous element through the ELM method.

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Section: Resultsmentioning

confidence: 99%

Section: Effect Of the Emulsion To Feed Ratiomentioning

confidence: 99%

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Removal of High Concentrations of Arsenite from Aqueous Solutions by the Emulsion Liquid Membrane Technique

Ghasemi,

Abdi,

Nasiri

2024

ChemistrySelect

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“…These advantages include less energy requirement, high separation selectivity, high mass transfer rate and less residence time [7]. To date, ELM technique has been used for the separation of many materials such as phenol [8], amino acids [9] and metals such as silver [10], gold [11], molybdenum [12], arsenic [13], platinum [14], rhodium [15], cadmium [16], cobalt [17], copper [18,19], uranium [20], palladium [21], chromium [22], zinc [23], zirconium [24] neodymium and gadolinium [25].…”

Section: Introductionmentioning

confidence: 99%

Investigation of experimental results and D-optimal design of hafnium ion extraction from aqueous system using emulsion liquid membrane technique

2020

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Hafnium metal is used in a wide range of industries such as microprocessor manufacturing, nuclear reactors and special alloys due to its physical, chemical and radiation properties. Emulsion liquid membrane (ELM) is an effective and efficient alternative for heavy metal separation compared to conventional methods due to high selectivity, energy-saving, high mass transfer and low operating capital. In this study, Cyanex 572 as a carrier, Span 85 as a surfactant, hydrochloric acid as an internal phase and kerosene as a diluent were used. In the first part of the study, the stability of the emulsions was investigated. The most stable emulsions were obtained by adding PIB polymer (3% w/v), Span 85 surfactant (3% w/v) and stirring for 15 min. In the second part, the separation of hafnium metal ions from aqueous solutions was investigated using ELM technique. The highest separation was obtained at 4% (v/v) as carrier concentration, 4% (w/v) as surfactant concentration, the membrane-to-feed volume ratio of 20/100 and W/O/W emulsion stirring rate and time equal to 400 rpm and 5 min, respectively. Moreover, to optimize the factors influencing the tests, the design of experiment (DOE) was performed using D-optimal method via Design Expert 10 software. Based on DOE results, the maximum extraction (> 99%) was achieved when the carrier concentration, the surfactant concentration, W/O/W emulsion stirring time, W/O/W emulsion stirring rate and emulsion volume/feed phase ratio were 4.49% v/v, 3.90% w/v, 11.49 min, 310.54 rpm and 2:1, respectively.

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“…From the experimental tests, the extraction of As(V) was effective with an efficiency of 70%. Recently, Srivastava et al [ 16 ] investigated the extraction of As(V) by emulsion liquid membrane using Aliquat-336 and 2-ethyl hexanol. From the results, 2-ethyl hexanol is a better carrier for As(V) removal from aqueous solution at low pH.…”

Section: Introductionmentioning

confidence: 99%

Extraction Kinetics of As(V) by Aliquat-336 Using Asymmetric PVDF Hollow-Fiber Membrane Contactors

et al. 2018

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This work focuses on the study of the mass transfer of arsenic(V) through asymmetric polyvinylidene fluoride hollow-fiber membrane contactors using Aliquat-336 as an extractant. In the first part of this work, the fibers were prepared and characterized by SEM and by determining their thickness and porosity. From SEM pictures, an asymmetric structure was obtained that was characterized by an inner sponge-like structure and outer finger-like structure with a pore radius and porosity about 0.11 µm and 80%, respectively. In the second part, the prepared fibers were used as membrane contactors for the study of mass transfer of arsenic(V), investigating the effect of several parameters such as pH, temperature, and initial concentration of the feed. The overall mass transfer coefficient of As(V) was around 6 × 10–6 cm/s.

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Comparative study of arsenic(V) removal from aqueous solution using Aliquat-336 and 2-ethyl hexanol through emulsion liquid membrane

Cited by 29 publications

References 18 publications

Removal of High Concentrations of Arsenite from Aqueous Solutions by the Emulsion Liquid Membrane Technique

Removal of High Concentrations of Arsenite from Aqueous Solutions by the Emulsion Liquid Membrane Technique

Investigation of experimental results and D-optimal design of hafnium ion extraction from aqueous system using emulsion liquid membrane technique

Extraction Kinetics of As(V) by Aliquat-336 Using Asymmetric PVDF Hollow-Fiber Membrane Contactors

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