Facile method for the selective recover 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. 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 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

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

10.21203/rs.3.rs-19978/v3 ◽

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

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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Research on Detecting Tris-(2,3-dibromopropyl)-Phosphate in Textiles with the HPLC/DAD Method

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.441.640 ◽

2012 ◽

Vol 441 ◽

pp. 640-644

Author(s):

Ke Jie Fu ◽

Li Sheng Yang ◽

Chang Sheng Feng ◽

Liang Chen

Keyword(s):

Limit Of Detection ◽

Extraction Process ◽

Ultrasound Assisted Extraction ◽

Routine Testing ◽

Assisted Extraction ◽

Ultrasound Assisted ◽

Pre Treatment ◽

Finishing Agent ◽

Detecting Method ◽

Precision Test

A detecting method for toxic flame retardant finishing agent tris-(2,3-dibromopropyl) -phosphate (TRIS for short) in textiles was studied. In the method, an acetonitrile ultrasound-assisted extraction process was included in sample pre-treatment, and HPLC/DAD was used in the separation and identification of extractives. After that, the conditions of pre-treatment and chromatograph were optimized. The results showed that the limit of detection (LOD) by this method (S/N10) is 1.0 mg/kg, its recovery ranged from 78.1% to 98.4%, and RSD of the precision test is 3.2%, of which all met the requirements for routine testing.

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Modeling and optimization of ultrasound‐assisted cinnamon extraction process using fuzzy and response surface models

Journal of Food Process Engineering ◽

10.1111/jfpe.12978 ◽

2018 ◽

Vol 42 (2) ◽

pp. e12978

Author(s):

Nur Cebi ◽

Osman Sagdic ◽

Abdulrahman Mohammed Basahel ◽

Mohammed Abdullah Balubaid ◽

Osman Taylan ◽

...

Keyword(s):

Response Surface ◽

Extraction Process ◽

Modeling And Optimization ◽

Response Surface Models ◽

Surface Models ◽

Ultrasound Assisted

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Ultrasound-Assisted Deep Eutectic Solvent Extraction of Anthocyanins from Blueberry Wine Residues: Optimization, Identification, and HepG2 Antitumor Activity

Molecules ◽

10.3390/molecules25225456 ◽

2020 ◽

Vol 25 (22) ◽

pp. 5456

Author(s):

Hongkun Xue ◽

Jiaqi Tan ◽

Qian Li ◽

Jintian Tang ◽

Xu Cai

Keyword(s):

Solvent Extraction ◽

Antitumor Activity ◽

Deep Eutectic Solvent ◽

Extraction Process ◽

Ultrasonic Power ◽

Extraction Temperature ◽

Brewing Process ◽

Ultrasound Assisted ◽

Optimum Extraction ◽

Better Than

Blueberry wine residues produced during the wine-brewing process contain abundant anthocyanins and other bioactive compounds. To extract anthocyanins from blueberry wine residues more efficiently, a novel procedure of ultrasound-assisted deep eutectic solvent extraction (UADESE) was proposed in this work. The extraction process was optimized by response surface methodology coupled with genetic algorithm. The optimum extraction parameters to achieve the highest yield of anthocyanins (9.32 ± 0.08 mg/g) from blueberry wine residues by UADESE were obtained at water content of 29%, ultrasonic power of 380 W, extraction temperature of 55 °C, and extraction time of 40 min. The AB-8 macroporous resin combined with Sephadex LH-20 techniques was used to purify the crude extract (CE) obtained under optimum extraction conditions and analyze the anthocyanins composition by HPLC-ESI-MS/MS. The cyanidin-3-rutinoside with purity of 92.81% was obtained. The HepG2 antitumor activity of CE was better than that of the purified anthocyanins component. Moreover, CE could increase the intracellular reactive oxygen species levels and the apoptosis, and arrest HepG2 cells in the S phases. These findings provided an effective and feasible method for anthocyanins extraction, and reduced the environmental burden of this waste.

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Antioxidant Capacity and Antigenotoxic Effect of Hibiscus sabdariffa L. Extracts Obtained with Ultrasound-Assisted Extraction Process

Applied Sciences ◽

10.3390/app10020560 ◽

2020 ◽

Vol 10 (2) ◽

pp. 560

Author(s):

Gregorio Iván Peredo Pozos ◽

Mario Alberto Ruiz-López ◽

Juan Francisco Zamora Nátera ◽

Carlos Álvarez Moya ◽

Lucia Barrientos Ramírez ◽

...

Keyword(s):

Antioxidant Activity ◽

Human Lymphocytes ◽

Dry Weight ◽

Extraction Process ◽

Hibiscus Sabdariffa ◽

Ultrasound Assisted Extraction ◽

Solid Ratio ◽

Assisted Extraction ◽

Ultrasound Assisted ◽

Antigenotoxic Effect

Hibiscus sabdariffa (Roselle) is in high demand worldwide due to its beneficial health properties owing to the polyphenols content, mainly in the flower calyx. The objective of this study was to find the best conditions (time and liquid: solid ratio) to extract polyphenols from Roselle using Ultrasound-Assisted Extraction (UAE) (40 kHz, 180 W), with ethanol how solvent; as well as determine the yield of phenols, anthocyanin, flavonoids, tannins, antioxidant activity (DPPH) and antigenotoxic effect (comet assay). A traditional solid-liquid extraction was applied as a reference. Extraction times of 40 and 60 min resulted in the highest polyphenols (13.019 mg GAE/g dry weight (dw)), flavonoids (4.981 CE/g dw), anthocyanins (1.855 mg Cya3GE/g dw), and tannins (0.745 CE/g dw) recoveries and an antioxidant activity (DPPH) of 74.58%. Extracts from white calyces contained similar amounts of phenols and flavonoids, but very little condensed tannins (0.049 CE/g dw) and practically no anthocyanins. Extracts from red and white calyces, showed antigenotoxic activity and repaired capacity of damage caused by mutagens in human lymphocytes.

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