Facile method for the selective recovery of Gd and Pr from LCD screen wastes using ultrasound-assisted leaching

Abstract Rare earth elements (REE) are essential for the production of technological devices. However, their high demand and low availability, together with an increase in electronic waste generation, compel the development of efficient, economic and green methods for recovering these elements from electronic waste. In this work, a facile method for selective recovering of REE from Liquid Crystal Display (LCD) screen wastes, employing ultrasound assisted leaching is presented. The screen wastes were milled and sieved to pass through a -325 mesh sieve (44 µm). The milled powder was subjected to ultrasound-assisted leaching in an aqueous medium, at room temperature (25 °C) and pH 6 for 60 min. Subsequently, a magnetic separation was applied to the leach residue. Inductively coupled plasma was employed to quantitatively analyze the composition of the LCD powders and determine the effectiveness of the extraction process. Scanning Electron Microscopy/Energy Dispersive X-Ray Spectroscopy allowed qualitative chemical analysis of the solid materials. The results show that the LCD screen wastes are formed, mainly, by amorphous oxides of Si, Fe, In, Sn and REE. The amount of Gadolinium (Gd) and Praseodymium (Pr) in the wastes were 93 and 24 mg kg-1, respectively, which justifies their recovery. X-ray diffraction analysis of the magnetic portion of the leached residue, confirmed the presence of an amorphous phase together with crystalline metallic iron alloy. The magnetic behavior, obtained by Vibration Sample Magnetometry, helped to understand the nature of the residues. The formation of this metallic alloy is attributed to the effect of high power ultrasonic during the leach. It was confirmed that the magnetic residue concentrates and recovers 87 wt% of Gd and 85 wt% of Pr contained in the original material. Therefore, ultrasound-assisted leaching is a selective and facile method for recovering Gd and Pr from waste LCD.

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Facile method for the selective recovery of Gd and Pr from LCD screen wastes using ultrasound-assisted leaching

Sustainable Environment Research ◽

10.1186/s42834-020-00060-w ◽

2020 ◽

Vol 30 (1) ◽

Author(s):

Astrid D. Toache-Pérez ◽

Ana M. Bolarín-Miró ◽

Félix Sánchez-De Jesús ◽

Gretchen T. Lapidus

Keyword(s):

Inductively Coupled Plasma ◽

Liquid Crystal Display ◽

Electronic Waste ◽

Milled Powder ◽

Iron Alloy ◽

Magnetic Behavior ◽

Extraction Process ◽

Original Material ◽

X Ray ◽

Ultrasound Assisted

AbstractRare earth elements (REE) are essential for the production of technological devices. However, their high demand and low availability, together with an increase in electronic waste generation, compel the development of efficient, economic and green methods for recovering these elements from electronic waste. In this work, a facile method for selective recovering of REE from Liquid Crystal Display (LCD) screen wastes, employing ultrasound assisted leaching is presented. The screen wastes were milled and sieved to pass through a − 325 mesh sieve (44 μm). The milled powder was subjected to ultrasound-assisted leaching in an aqueous medium, at room temperature (25 °C) and pH 6 for 60 min. Subsequently, a magnetic separation was applied to the leach residue. Inductively coupled plasma was employed to quantitatively analyze the composition of the LCD powders and determine the effectiveness of the extraction process. Scanning Electron Microscopy/Energy Dispersive X-Ray Spectroscopy allowed qualitative chemical analysis of the solid materials. The results show that the LCD screen wastes are formed, mainly, by amorphous oxides of Si, Fe, In, Sn and REE. The amount of Gadolinium (Gd) and Praseodymium (Pr) in the wastes were 93 and 24 mg kg− 1, respectively, which justifies their recovery. X-ray diffraction analysis of the magnetic portion of the leached residue, confirmed the presence of an amorphous phase together with crystalline metallic iron alloy. The magnetic behavior, obtained by Vibration Sample Magnetometry, helped to understand the nature of the residues. The formation of this metallic alloy is attributed to the effect of high power ultrasonic during the leach. It was confirmed that the magnetic residue concentrates and recovers 87 wt% of Gd and 85 wt% of Pr contained in the original material. Therefore, ultrasound-assisted leaching is a selective and facile method for recovering Gd and Pr from waste LCD.

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Facile method for the selective recovery of Gd and Pr from LCD screen wastes using ultrasound-assisted leaching

10.21203/rs.3.rs-19978/v4 ◽

2020 ◽

Author(s):

Astrid D. Toache-Pérez ◽

Ana M. Bolarín-Miró ◽

Félix Sánchez-De Jesús ◽

Gretchen T. Lapidus

Keyword(s):

Inductively Coupled Plasma ◽

Liquid Crystal Display ◽

Electronic Waste ◽

Milled Powder ◽

Iron Alloy ◽

Magnetic Behavior ◽

Extraction Process ◽

Original Material ◽

X Ray ◽

Ultrasound Assisted

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Facile method for the selective recover of Gd and Pr from LCD screen wastes using ultrasound-assisted leaching

10.21203/rs.3.rs-19978/v2 ◽

2020 ◽

Author(s):

Astrid D. Toache-Pérez ◽

Ana M. Bolarín-Miró ◽

Félix Sánchez-De Jesús ◽

Gretchen T. Lapidus

Keyword(s):

Liquid Crystal Display ◽

Electronic Waste ◽

Milled Powder ◽

Iron Alloy ◽

Magnetic Behavior ◽

Extraction Process ◽

Leach Residue ◽

Original Material ◽

Ultrasound Assisted ◽

Pass Through

Abstract Rare earth elements (REE) are essential for the production of technological devices. However, their high demand and low availability, together with an increase in electronic waste generation, compel the development of efficient, economic and green methods for recovering these elements from electronic waste. In this work, a facile method for selective recovering of REE from Liquid Crystal Display (LCD) screen wastes, employing ultrasound assisted leaching is presented. The screen wastes were milled and sieved to pass through a -325 mesh sieve. The milled powder was subjected to ultrasound-assisted leaching in an aqueous medium, at room temperature (25 °C) and pH 6 for 60 minutes. Subsequently, a magnetic separation was applied to the leach residue. ICP was employed to quantitatively analyze the composition of the LCD powders and determine the effectiveness of the extraction process. SEM-EDS allowed qualitative chemical analysis of the solid materials. The results shown that the LCD screen wastes are formed, mainly, by amorphous oxides of Si, Fe, In, Sn and REE. The amount of Gadolinium (Gd) and Praseodymium (Pr) in the wastes were 93 mg kg-1 and 24 mg kg-1, respectively, which justifies their recovery. X-ray diffraction analysis of the magnetic portion of the leach residue, confirmed the presence of an amorphous phase together with crystalline metallic iron alloy. The magnetic behavior, obtained by Vibration Sample Magnetometry, helped to understand the nature of the residues. The formation of this metallic alloy is attributed to the effect of high power ultrasonic during the leach. It was confirmed that the magnetic residues concentrates and recovers 87 wt. % of Gd and 85 wt. % of Pr contained in the original material. Therefore, ultrasound-assisted leaching is a selective and facile method for recovering Gd and Pr from waste LCD.

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Facile method for the selective recover of Gd and Pr from LCD screen wastes using ultrasound-assisted leaching

10.21203/rs.3.rs-19978/v1 ◽

2020 ◽

Author(s):

Astrid D. Toache Pérez ◽

Ana M. Bolarín Miró ◽

Félix Sánchez De Jesús ◽

Gretchen T. Lapidus Lavine

Keyword(s):

Liquid Crystal Display ◽

Electronic Waste ◽

Milled Powder ◽

Iron Alloy ◽

Total Content ◽

Magnetic Behavior ◽

Extraction Process ◽

Ultrasound Assisted ◽

Pass Through ◽

Vibration Sample Magnetometry

Abstract Rare earth elements (REE) are essential for the production of technological devices. However, their high demand and low availability, together with an increase in electronic waste generation, compel the development of efficient, economic and green methods for recovering these elements from electronic waste. In this work, a facile method for selective recovering of REE from Liquid Crystal Display (LCD) screen wastes, employing ultrasound assisted leaching is presented. The screen wastes were milled and sieved to pass through − 325 mesh sieve. The milled powder was summited to ultrasound-assisted leaching in aqueous medium, at room temperature (25 °C) and pH 6 for 60 minutes. Subsequently, a magnetic separation was applied into the leach residue. ICP was employed to quantitatively analyze the composition of the LCD powders and the effectiveness of the extraction process. SEM-EDS allowed qualitatively analyzing the chemical composition of the solid materials. The results shown that the LCD screen wastes are formed, mainly, by amorphous oxides of Si, Fe, In, Sn and REE. The amount of Gd and Pr in the wastes were 93 mg/kg and 24 mg/kg, respectively; It represents enough reason to recover it. X-ray diffraction analysis of the magnetic portion of the leaching residue, confirmed the presence of an amorphous phase together with crystalline metallic iron alloy. The magnetic behavior, obtained by Vibration Sample Magnetometry, helped to understand the nature of the residues. The formation of this metallic alloy is attributed to the effect of high power ultrasonic during the leaching. It was confirmed that the magnetic residues concentrates and recovers 87 wt. % of Gd and 85 wt. % of Pr of the total content of these REE in the magnetic residue. Therefore, ultrasound-assisted leaching is a selective and facile method for recovering Gd and Pr from a screen wastes.

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Development of ultrasound-assisted dispersive solid-phase microextraction based on mesoporous carbon coated with silica@iron oxide nanocomposite for preconcentration of Te and Tl in natural water systems

Open Chemistry ◽

10.1515/chem-2020-0039 ◽

2020 ◽

Vol 18 (1) ◽

pp. 412-425

Author(s):

Luthando Nyaba ◽

Buyile Dubazana ◽

Anele Mpupa ◽

Philiswa N. Nomngongo

Keyword(s):

Electron Microscopy ◽

Inductively Coupled Plasma ◽

Solid Phase Microextraction ◽

Solid Phase ◽

Sol Gel ◽

Emission Spectrometry ◽

X Ray ◽

Relative Standard ◽

Separation And Preconcentration ◽

Ultrasound Assisted

AbstractThe main objective of this study was to develop an ultrasound-assisted dispersive solid-phase microextraction (UADSPME) method for separation and preconcentration of tellurium (Te) and thallium (Tl) in environmental samples prior to inductively coupled plasma-optical emission spectrometry determination. The MPC@SiO2@Fe3O4 nanocomposite was used as a nanoadsorbent in the UADSPME method. The nanocomposite was prepared using a coprecipitation and sol–gel method, and it was characterized using scanning electron microscopy/energy-dispersive X-ray spectroscopy, transmission electron microscopy and X-ray powder diffraction techniques. The Box–Behnken design and response surface methodology were used for the optimization of experimental parameters (such as pH, extraction time and mass of adsorbent) affecting the preconcentration procedure. Under optimized conditions, the limits of detection were 0.05 and 0.02 µg L−1 and the limits of quantification were 0.17 and 0.07 µg L−1 for Te and Tl, respectively. The precision expressed as the relative standard deviation (%RSD) was 2.5% and 2.8% for Te and Tl, respectively. Finally, the developed method was applied for the analysis of Tl and Te in real samples.

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Sorption of Se (IV) from aqueous solutions with subsequent determination by X-ray fluorescence analysis

Industrial laboratory Diagnostics of materials ◽

10.26896/1028-6861-2020-86-10-5-9 ◽

2020 ◽

Vol 86 (10) ◽

pp. 5-9

Author(s):

D. G. Filatova ◽

A. A. Arkhipenko ◽

M. A. Statkus ◽

V. V. Es’kina ◽

V. B. Baranovskaya ◽

...

Keyword(s):

Inductively Coupled Plasma ◽

Fluorescence Analysis ◽

Standard Samples ◽

Phase Contact Time ◽

Sorbent Phase ◽

X Ray ◽

Fundamental Parameters ◽

Inductively Coupled ◽

Subsequent Determination

An approach to sorptive separation of Se (IV) from solutions on a novel S,N-containing sorbent with subsequent determination of the analyte in the sorbent phase by micro-x-ray fluorescence method is presented. The sorbent copolymethylenesulfide-N-alkyl-methylenamine (CMA) was synthesized using «snake in the cage» procedure and proven to be stable in acid solutions. Conditions for quantitative extraction of Se (IV) were determined: sorption in 5 M HCl or 0.05 M HNO3 solutions when heated to 60°C, phase contact time being 1 h. The residual selenium content in the solution was determined by inductively coupled plasma mass spectrometry (ICP-MS) using 82Se isotope. The absence of selenium losses is proved and the mechanism of sorption interaction under specified conditions is proposed. The method of micro-x-ray fluorescence analysis (micro-RFA) with mapping revealed a uniform distribution of selenium on the sorbent surface. The possibility of determining selenium in the sorbent phase by micro-RFA is shown. When comparing the obtained results with the results of calculations by the method of fundamental parameters, it is shown the necessity of using standard samples of sorbates to obtain correct results of RFA determination of selenium in the sorbent phase.

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DETERMINATION OF NICKEL, ZINC AND COBALT IN ADVANCED MATERIALS BASED ON NixCo3–xO4 AND ZnxCo3–xO4 BY INDUCTIVELY COUPLED PLASMA MASS SPECTROMETRY (ICP-MS) AND X-RAY FLUORESCENCE

Industrial laboratory Diagnostics of materials ◽

10.26896/1028-6861-2018-84-1-i-10-13 ◽

2018 ◽

Vol 84 (1) ◽

pp. 10-13 ◽

Cited By ~ 4

Author(s):

A. A. Krotova ◽

K. Ya. Prikhodko ◽

S. A. Vladimirova ◽

D. G. Filatova

Keyword(s):

Mass Spectrometry ◽

Inductively Coupled Plasma ◽

Advanced Materials ◽

X Ray ◽

Inductively Coupled ◽

Nickel Zinc ◽

Determination Of Nickel ◽

Icp Ms ◽

Plasma Mass Spectrometry

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Processing of granite quarry solid waste into industrial high silica materials using leaching process with HCl concentration variation

Jurnal Riset Teknologi Pencegahan Pencemaran Industri ◽

10.21771/jrtppi.2020.v11.no2.p43-50 ◽

2020 ◽

Vol 11 (2) ◽

pp. 43-50

Author(s):

Yusup Hendronursito ◽

Muhammad Amin ◽

Slamet Sumardi ◽

Roniyus Marjunus ◽

Frista Clarasati ◽

...

Keyword(s):

Particle Size ◽

Rotational Speed ◽

Inductively Coupled Plasma ◽

Chemical Elements ◽

Silica Content ◽

X Ray ◽

Concentration Variation ◽

Leaching Process ◽

Hcl Concentration ◽

Granite Powder

This study was aimed to increase granite's silica content using the leaching process with HCl concentration variation. The granite used in this study came from Lematang, South Lampung. This study aims to determine the effect of variations in HCl concentration, particle size, and rotational speed on the crystalline phase and chemical elements formed in the silica product produced from granite. The HCl concentration variations were 6.0 M, 7.2 M, 8.4 M, and 9.6 M, the variation in particle size used was 270 and 400 mesh. Variations in rotational speed during leaching were 500 and 750 rpm. Granite powder was calcined at 1000 ºC for 2 hours. Characterization was performed using X-Ray Fluorescence (XRF), X-Ray Diffraction (XRD), and Inductively Coupled Plasma-Optical Emission Spectroscopy (ICP- OES). The results showed that the silica content increased with increasing HCl concentration, the finer the particle size, and the higher the rotational speed. XRF analysis showed that the silica with the highest purity was leached with 9.6 HCl with a particle size of 400 mesh and a rotational speed of of 750 rpm, which was 73.49%. Based on the results above, by leaching using HCl, the Si content can increase from before. The XRD diffractogram showed that the granite powder formed the Quartz phase.

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Distribution and Mode of Occurrence of Co, Ni, Cu, Zn, As, Ag, Cd, Sb, Pb in the Feed Coal, Fly Ash, Slag, in the Topsoil and in the Roots of Trees and Undergrowth Downwind of Three Power Stations in Poland

Minerals ◽

10.3390/min11020133 ◽

2021 ◽

Vol 11 (2) ◽

pp. 133

Author(s):

Henryk R. Parzentny ◽

Leokadia Róg

Keyword(s):

Inductively Coupled Plasma ◽

Coal Fly Ash ◽

Atomic Emission ◽

Emission Spectrometry ◽

Plasma Atomic Emission Spectrometry ◽

X Ray ◽

Inductively Coupled ◽

Power Stations ◽

Mode Of Occurrence ◽

Feed Coal

It is supposed that the determination of the content and the mode of occurrence of ecotoxic elements (EE) in feed coal play the most significant role in forecasting distribution of EE in the soil and plants in the vicinity of power stations. Hence, the aim of the work was to analyze the properties of the feed coal, the combustion residues, and the topsoil which are reached by EE together with dust from power stations. The mineral and organic phases, which are the main hosts of EE, were identified by microscopy, X-ray powder diffraction, inductively coupled plasma atomic emission spectrometry, and scanning electron microscope with an energy dispersive X-ray methods. The highest content of elements was observed in the Oi and Oe subhorizons of the topsoil. Their hosts are various types of microspheres and char, emitted by power stations. In the areas of long-term industrial activity, there are also sharp-edged grains of magnetite emitted in the past by zinc, lead, and ironworks. The enrichment of the topsoil with these elements resulted in the increase in the content of EE, by between 0.2 times for Co; and 41.0 times for Cd in the roots of Scots pine, common oak and undergrowth, especially in the rhizodermis and the primary cortex and, more seldom, in the axle roller and cortex cells.

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Incorporation of silver stearate nanoparticles in methacrylate polymeric monoliths for hemeprotein isolation

Open Chemistry ◽

10.1515/chem-2020-0051 ◽

2020 ◽

Vol 18 (1) ◽

pp. 399-411

Author(s):

Eman Alzahrani

Keyword(s):

Noble Metals ◽

Extraction Process ◽

Sem Analysis ◽

X Ray ◽

Polymeric Scaffold ◽

Extended Surface ◽

Unique Method ◽

Unique Approach ◽

Ft Ir ◽

Ft Ir Spectroscopy

AbstractA unique method was used to synthesize extremely stable silver stearate nanoparticles (AgStNPs) incorporated in an organic-based monolith. The facile strategy was then used to selectively isolate hemeproteins, myoglobin (Myo) and hemoglobin (Hb). Ethyl alcohol, silver nitrate, and stearic acid were, respectively, utilized as reducing agents, silver precursors, and capping agents. The color changed to cloudy from transparent, indicating that AgStNPs had been formed. AgStNP nanostructures were then distinctly integrated into the natural polymeric scaffold. To characterize the AgStNP–methacrylate polymeric monolith and the silver nanoparticles, energy-dispersive X-ray (EDX), scanning electron microscopy (SEM), and Fourier-transform infrared (FT-IR) spectroscopy were used. The results of the SEM analysis indicated that the AgStNP–methacrylate polymeric monolith’s texture was so rough in comparison with that of the methacrylate polymeric monolith, indicating that the extraction process of the monolith materials would be more efficient because of the extended surface area of the absorbent. The comparison between the FT-IR spectra of AgStNPs, the bare organic monolith, and AgStNP–methacrylate polymeric monolith confirms that the AgStNPs were immobilized on the surface of the organic monolith. The EDX profile of the built materials indicated an advanced peak of the Ag sequence which represented an Ag atom of 3.27%. The results therefore established that the AgStNPs had been successfully integrated into the monolithic materials. Extraction efficiencies of 92% and 97% were used to, respectively, recover preconcentrated Myo and Hb. An uncomplicated method is a unique approach of both fabrication and utilization of the nanosorbent to selectively isolate hemeproteins. The process can further be implemented by using other noble metals.

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