Selective separation and enrichment of neodymium and gadolinium by emulsion liquid membrane using a novel extractant CYANEX® 572

Davoodi-Nasab, Payman; Rahbar-Kelishami, Ahmad; Safdari, Jaber; Abolghasemi, Hossein

doi:10.1016/j.mineng.2017.11.008

Cited by 28 publications

(11 citation statements)

References 62 publications

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“…Adequate precision measures the signal-to-noise ratio. A ratio > 4 is desirable, hence, the obtained ratio of 37.219 indicates an adequate signal [45,46].…”

Section: Discussionmentioning

confidence: 99%

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Response Surface Optimization of Dysprosium Extraction Using an Emulsion Liquid Membrane Integrated with Multi‐Walled Carbon Nanotubes

et al. 2018

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A new emulsion liquid membrane was prepared for dysprosium (Dy) extraction from aqueous solution using multi-walled carbon nanotubes (MWCNTs). The influence of MWCNT concentration, carrier and surfactant concentration, stirring speed, feed-phase pH, and internal phase concentration and their interactive effects were studied. A regression model for Dy extraction was developed and the parameters were optimized by response surface methodology. The extent of extraction increases with higher MWCNT concentration up to a certain level. The Dy extraction through the liquid membrane containing MWCNT improves with time. Moreover, the overall mass transfer coefficient was enhanced in the presence of MWCNT due to the formation of a more stable emulsion and liquid membrane.

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“…Adequate precision measures the signal-to-noise ratio. A ratio > 4 is desirable, hence, the obtained ratio of 37.219 indicates an adequate signal [45,46].…”

Section: Discussionmentioning

confidence: 99%

“…In other words, the volume ratio of stripping aqueous solution to organic solution was 1:1 or the volume ratio of stripping solution to emulsion was 0.5. This value is the most convenient for ELM processes at laboratory scale according to the literature [38,[43][44][45].…”

Section: Methodsmentioning

confidence: 99%

Response Surface Optimization of Dysprosium Extraction Using an Emulsion Liquid Membrane Integrated with Multi‐Walled Carbon Nanotubes

et al. 2018

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“…Membran cair adalah metode yang paling efisien untuk memisahkan dan memurnikan UTJ, salah satunya dengan metode Emulsion Liquid Membrane (ELM) (Kolev, 2018). ELM dikembangkan karena memiliki banyak kelebihan, yaitu biaya yang rendah karena konsumsi bahan kimia sedikit yang mengarah pada isu green chemistry, efisiensi, dan selektivitas yang tinggi, kecepatan transfer massa lebih cepat karena area antarmuka yang besar, ekstraksi dan pengupasan (stripping) terjadi secara simultan atau satu tahap (Raji et al, 2017b;Anitha et al, 2015;Davoodi-nasab et al, 2018b). Pengupasan atau stripping adalah proses ekstraksi kembali logam dari fase organik ke fase air (Biyantoro, 2007).…”

Section: Pendahuluanunclassified

“…Ligan dengan konsentrasi yang terlalu rendah menyebabkan UTJ dalam fase umpan tidak terekstraksi sempurna. Hal ini disebabkan karena ligan sudah habis bereaksi sedangkan masih ada UTJ yang tersisa di fase umpan sehingga dibutuhkan ligan dengan konsentrasi yang sesuai (Wang et al, 2011;Davoodi-Nasab et al, 2018b).…”

Section: Pembahasan Ligan Sebagai Agen Pembawaunclassified

Pengaruh Berbagai Parameter Ekstraksi dalam Pemisahan Unsur Tanah Jarang dengan Metode Emulsion Liquid Membrane (ELM)

et al. 2021

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Unsur Tanah Jarang (UTJ) adalah 15 elemen kelompok lantanida, ditambah skandium dan itrium yang termasuk kelompok aktinida. UTJ memiliki banyak manfaat di berbagai bidang. Sifat fisik dan kimia yang mirip antar UTJ membuatnya sulit dipisahkan sehingga pemisahan UTJ menarik dipelajari dengan berbagai macam metode, salah satunya adalah dengan menggunakan Emulsion Liquid Membrane (ELM). ELM merupakan metode pemisahan yang dikembangkan dari ekstraksi pelarut terdiri dari tiga fase, yaitu fase eksternal (fase umpan) yang berisi UTJ yang akan dipisahkan, fase internal (fase pengupasan), dan fase membran. Fase membran berisi surfaktan sebagai penstabil dan ligan yang akan membentuk kompleks dengan UTJ pada antarmuka fase umpan dan membawanya berdifusi ke dalam fase pengupasan. ELM merupakan metode efektif untuk pemisahan karena tahap ekstraksi dan pengupasan (stripping) terjadi secara bersamaan dalam satu tahap dan fase membrannya dapat digunakan kembali. Pemisahan UTJ menggunakan metode ELM dengan berbagai ligan, seperti D2EHPA, Cyanex 572, P204, dan (RO)2P(O)OPh-COOH dipengaruhi oleh berbagai parameter, seperti konsentrasi ligan, pH fase umpan, waktu pengadukan ekstraksi, kecepatan pengadukan ekstraksi, rasio fase umpan, konsentrasi fase pengupasan, konsentrasi surfaktan, dan konsentrasi fase umpan. Parameter tersebut diseleksi untuk mendapatkan kondisi optimum sehingga meningkatkan efisiensi ekstraksi dan pengupasan yang berbeda.Effect of Various Parameters in Separation of Rare Earth Elements using the Emulsion Liquid Membrane (ELM) Method. Rare Earth Elements (REEs) are 15 elements of the lanthanide group, plus scandium and yttrium, which belong to the actinide group. REEs have many benefits in various fields. Similar physical and chemical properties between REEs make it difficult to separate, thus REEs separation is interesting to study by various methods, one of which is by using an emulsion liquid membrane (ELM). ELM is a method developed from solvent extraction consisting of three phases: the external phase (feed phase) which contains REEs to be collected, the internal phase (stripping phase), and the membrane phase. The membrane phase contains surfactants as stabilizers and ligands which will form complexes with REEs in the feed phase and are designed to diffuse into the stripping phase. ELM is an effective method to involve because extraction and stripping occur together in one glass and the membrane phase can be reused. Separation of REEs using the ELM method with various ligands, such as D2EHPA, Cyanex 572, P204, and (RO)2P(O)OPh-COOH influenced by various parameters, such as ligand concentration, feed phase pH, extraction stirring time, extraction stirring speed, feed phase ratio, stripping phase concentration, surfactant concentration, and feed phase concentration. These parameters are selected to obtain optimum conditions thereby increasing the efficiency of different extraction and stripping.

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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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Selective separation and enrichment of neodymium and gadolinium by emulsion liquid membrane using a novel extractant CYANEX® 572

Cited by 28 publications

References 62 publications

Response Surface Optimization of Dysprosium Extraction Using an Emulsion Liquid Membrane Integrated with Multi‐Walled Carbon Nanotubes

Response Surface Optimization of Dysprosium Extraction Using an Emulsion Liquid Membrane Integrated with Multi‐Walled Carbon Nanotubes

Pengaruh Berbagai Parameter Ekstraksi dalam Pemisahan Unsur Tanah Jarang dengan Metode Emulsion Liquid Membrane (ELM)

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

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