Mobilization of platinum and palladium from exhausted catalytic converters using bio-cyanide and an ionic-liquid as mass transport carriers

Ilyas, Sadia; Srivastava, Rajiv Ranjan; Kim, Hyung-Seok

doi:10.1039/d2gc00874b

Cited by 29 publications

(6 citation statements)

References 53 publications

(120 reference statements)

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“…In the process of hydrophobic modification, the dehydration condensation reaction occurred between the rich hydroxyl group on the surface of TiO 2 and the methoxy group of HDTMS. As shown in Figure 3a, compared with the pristine CF and TiO 2 /CS@CF, the stretching vibration peaks of methyl and methylene at 2923 cm −1 and 2857 cm −1 were significantly enhanced in the FT‐IR spectrum of the HDTMS‐TiO 2 /CS@CF 28,29 . Meanwhile, a new absorption peak corresponding to SiOTi bond appeared at 931 cm −1 , 30,31 verifying the successful hydrophobic modification by HDTMS.…”

Section: Resultsmentioning

confidence: 77%

“…As shown in Figure 3a, compared with the pristine CF and TiO 2 /CS@CF, the stretching vibration peaks of methyl and methylene at 2923 cm À1 and 2857 cm À1 were significantly enhanced in the FT-IR spectrum of the HDTMS-TiO 2 /CS@CF. 28,29 Meanwhile, a new absorption peak corresponding to Si O Ti bond appeared at 931 cm À1 , 30,31 verifying the successful hydrophobic modification by HDTMS. Figure 3b presents the XPS spectrum of the HDTMS-TiO 2 /CS@CF.…”

Section: Surface Morphology and Chemical Characterizationmentioning

confidence: 80%

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A facile approach to fabricating fluorine‐free superhydrophobic cotton fabric with excellent oil–water separation performance

Zheng

et al. 2023

J of Applied Polymer Sci

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With the increasing deterioration of environmental and ecology caused by industrial wastewater pollution and petroleum spill accidents, superhydrophobic materials for oil–water separation have attracted considerable attention. Herein, we propose a facile approach to fabricate fluorine‐free superhydrophobic cotton fabric (CF) for oil–water separation after the coverage of chitosan (CS) and titanium dioxide (TiO2) nanoparticles and the subsequent hydrophobization modification by hexadecyltrimethoxysilane (HDTMS). The obtained HDTMS‐TiO2/CS@CF showed superhydrophobicity with a high water contact angle of 160.6° as well as excellent self‐cleaning capability, non‐adhesion capability and surface stability. Moreover, the CF was successfully applied for the separation of various oil–water mixtures. The separation efficiency for trichloromethane‐water mixture reached 95.8%, and still maintained 95.6% after 30 separation cycles. In addition, the CF also possessed superior photocatalytic degradation capability for organic contaminant such as oil red O and the degradation rate was 86.2% under UV irradiation for 180 min. The preparation method in this work is simple, environmentally friendly, low‐cost, and easy to produce on a large scale. The findings conceivably stand out as a new method to fabricate superhydrophobic materials and show great application potential in the fields of oil–water separation and water purification.

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Section: Resultsmentioning

confidence: 77%

Section: Surface Morphology and Chemical Characterizationmentioning

confidence: 80%

A facile approach to fabricating fluorine‐free superhydrophobic cotton fabric with excellent oil–water separation performance

Zheng

et al. 2023

J of Applied Polymer Sci

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“…As the reaction proceeds, the unreacted solid core shrinks to the solid center, and a porous product layer is formed around the unreacted core. However, as the leaching reaction continues, it is assumed that the initial external radius of the solid remains unchanged [28][29][30][31][32].…”

Section: Investigation Of Kineticsmentioning

confidence: 99%

Leaching Kinetics of Hemimorphite with 5-Sulfosalicylic Acid

Wen

Cao

et al. 2023

Metals

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The kinetics of leaching zinc from hemimorphite was investigated. The factors that influence hemimorphite leaching were also evaluated, and a kinetic model was built. In addition, scanning electron microscopy-energy dispersive spectroscopy (SEM-EDS) was used to investigate the changes of surface morphology before and after leaching. By decreasing particle size and increasing temperature, 5-sulfosalicylic acid concentration, and stirring speed, the leaching rate of hemimorphite can be enhanced. The shrinkage nucleus model describes the surface chemistry of leaching. The activation energy of hemimorphite by 5-sulfosalicylic acid in the leaching process was determined as 55.244 kJ/mol. The reaction rate based on the shrinkage nucleus model can be expressed by the semi-empirical formula:1−1−x1/3 =[k0C0.3385(r0)−0.6083(SS)0.4992exp(−55.244/RT)]t. At the condition of 50 °C of leaching temperature, 0.175 mol/L of 5-sulfosalicylic acid concentration, 82.5 μm of particle size and 650 rpm of stirring speed, the high leaching rates of zinc were obtained. After the reaction time of 15 min, the leaching rate of zinc reached more than 95%. According to the SEM-EDS results, the hemimorphite and leaching residue are distributed in blocks, but the particle size of the leaching residue is smaller, and the atomic concentrations of Zn and Si in the leaching residue are significantly lower than those in the hemimorphite, so the leaching effect is remarkable. Therefore, 5-sulfosalicylic acid solution would be an excellent leaching agent for zinc extraction from hemimorphite.

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“…However, the present review is limited mainly with biomining, which includes microbial metal recovery from ores, dumps, and tails while the area of bioleaching is wider and includes metal recovery from secondary sources, e.g., spent batteries, e-waste etc. [ 8 , 9 , 10 , 11 , 12 ]. Leaching microorganisms in the e-waste bioleaching are often presented with neutrophilic and heterotrophic bacteria.…”

Section: Introductionmentioning

confidence: 99%

Current Trends in Metal Biomining with a Focus on Genomics Aspects and Attention to Arsenopyrite Leaching—A Review

Абашина

Vainshtein

2023

Microorganisms

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The presented review is based on scientific microbiological articles and patents in the field of biomining valuable metals. The main attention is paid to publications of the last two decades, which illustrate some shifts in objects of interest and modern trends both in general and applied microbiology. The review demonstrates that microbial bioleaching continues to develop actively, despite various problems in its industrial application. The previous classic trends in the microbial bioleaching persist and remain unchanged, including (i) the search for and selection of new effective species and strains and (ii) technical optimization of the bioleaching process. Moreover, new trends were formed during the last decades with an emphasis on the phylogeny of leaching microbiota and on genomes of the leaching microorganisms. This area of genomics provides new, interesting information and forms a basis for the subsequent construction of new leaching strains. For example, this review mentions some changed strains with increased resistance to toxic compounds. Additionally, the review considers some problems of bioleaching valuable metals from toxic arsenopyrite.

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Mobilization of platinum and palladium from exhausted catalytic converters using bio-cyanide and an ionic-liquid as mass transport carriers

Abstract: The present study investigated the resource circulation of precious metals (Pt and Pd) from exhausted catalytic-converters using a green integrative approach of bio-solvo-chemical techniques. Herein, the used biogenic cyanide as...

Cited by 29 publications

References 53 publications

A facile approach to fabricating fluorine‐free superhydrophobic cotton fabric with excellent oil–water separation performance

A facile approach to fabricating fluorine‐free superhydrophobic cotton fabric with excellent oil–water separation performance

Leaching Kinetics of Hemimorphite with 5-Sulfosalicylic Acid

Current Trends in Metal Biomining with a Focus on Genomics Aspects and Attention to Arsenopyrite Leaching—A Review

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