Electrochemical extraction of palladium from spent heterogeneous catalysts of a petrochemical unit using the leaching and flat plate graphite electrodes

Ghalehkhondabi, Vahab; Fazlali, Alireza; Daneshpour, Farzaneh

doi:10.1016/j.seppur.2020.117527

Cited by 9 publications

(3 citation statements)

References 65 publications

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“…The electrochemical studies were carried out in a 600 ml three‐electrode glass cell with a flat plate graphite, which is more economical than other metals such as platinum, working and counter electrode (12 cm× 7.5 cm× 1.5 cm), and a saturated calomel electrode (SCE) reference electrode, as illustrated in Figure 1B. [ 64 ] The cell was filled with different liquid/solid ratios of the filtrate (filtered acid leachate) obtained in the previous step, and electrodeposition was performed on the cathode and anode under various experimental conditions to investigate the impact of electroleaching process factors on the recovery of Ni and V from spent catalyst. The filtrate (1 < pH < 2) was employed as the electrolyte, with pHs of 2 and 4 utilized to precipitate Ni on the anode and V on the cathode, respectively, using NaOH solution.…”

Section: Methodsmentioning

confidence: 99%

Electrometallurgical recovery of nickel and vanadium from spent desulphurization catalysts using an acidic leaching–electrolysis technique

2023

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Spent desulphurization catalysts are considered a major secondary source of valuable metals. The contents of nickel and vanadium present in these catalysts, accompanied by environmental rules, have attracted scientists to explore diverse options for their effective processing. The electrometallurgy recovery of Ni and V from the spent desulphurization Ni‐Mo‐V/Al2O3 catalyst is described in this study. Using flat plate graphite electrodes, the electrochemical deposition of Ni and V from spent catalyst in an acid solution (HNO3/H2SO4) was investigated. By the central composite design of the response surface methodology, the effect of the operating factors was examined and optimized. At the ideal conditions of reaction temperatures of 84.0 and 42.0°C, electrolysis times of 5.6 and 4.4 h, liquid/solid ratios of 22.7 and 15.4 ml/g, and current densities of 229.0 and 255.6 A/m2, respectively, the recovery efficiencies of Ni and V were 81.96% and 93.07%. The statistical analysis revealed that the expected data (R2 = 0.9984 and R2 = 0.9883) were in good agreement with the observed data (R2 = 0.9984), with an average variation from experimental data of 0.78% and 0.65% for the optimum conditions of Ni and V recovery, respectively. It shows that the Ni and V nanoparticles deposited have a spherical form with purities of 84.39% and 90.76%, respectively. Because of its great efficiency and purity, the current study can provide a dependable procedure for extracting Ni and V from solid waste.

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Section: Methodsmentioning

confidence: 99%

Electrometallurgical recovery of nickel and vanadium from spent desulphurization catalysts using an acidic leaching–electrolysis technique

2023

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“…Electrochemical processes can be an alternative for metal recovery. Electrolysis is an interesting process inducing the precipitation of metal particles [ 82 ]. Then, all the metal can be recovered from the medium by performing a simple solid–liquid filtration.…”

Section: Treatment Processes For Rare Metal Recoverymentioning

confidence: 99%

Recovery of Homogeneous Platinoid Catalysts from Pharmaceutical Media: Review on the Existing Treatments and the Perspectives of Membrane Processes

Magne,

Carretier,

Ubiera Ruiz

et al. 2023

Membranes

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Catalyst recovery is a major challenge for reaching the objectives of green chemistry for industry. Indeed, catalysts enable quick and selective syntheses with high reaction yields. This is especially the case for homogeneous platinoid catalysts which are almost indispensable for cross-coupling reactions often used by the pharmaceutical industry. However, they are based on scarce, expensive, and toxic resources. In addition, they are quite sensitive and degrade over time at the end of the reaction. Once degraded, their regeneration is complex and hazardous to implement. Working on their recovery could lead to highly effective catalytic chemistries while limiting the environmental and economic impacts of their one-time uses. This review aims to describe and compare conventional processes for metal removal while discussing their advantages and drawbacks considering the objective of homogeneous catalyst recovery. Most of them lead to difficulty recycling active catalysts due to their ability to only treat metal ions or to chelate catalysts without the possibility to reverse the mechanism. However, membrane processes seem to offer some perspectives with limiting degradations. While membranes are not systematically the best option for recycling homogeneous catalysts, current development might help improve the separation between pharmaceutical active ingredients and catalysts and enable their recycling.

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“… Electrodes: flat plate graphite. 99.07% Pd recovery with a purity of 94.02% [ 25 ] To recover copper by electro-electrodialysis (EED) from ammonia solutions. Cu +2 concentrations from 0.01 to 0.1 mol·dm −3 .…”

Section: Treatment and Reuse Of Wastewater By Electrodepositionmentioning

confidence: 99%

An Old Technique with A Promising Future: Recent Advances in the Use of Electrodeposition for Metal Recovery

Delgado¹,

Fernández-Morales²,

Llanos³

2021

Molecules

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Although the first published works on electrodeposition dates from more than one century ago (1905), the uses of this technique in the recovery of metals are attracting an increasing interest from the scientific community in the recent years. Moreover, the intense use of metals in electronics and the necessity to assure a second life of these devices in a context of circular economy, have increased the interest of the scientific community on electrodeposition, with almost 3000 works published per year nowadays. In this review, we aim to revise the most relevant and recent publications in the application of electrodeposition for metal recovery. These contributions have been classified into four main groups of approaches: (1) treatment and reuse of wastewater; (2) use of ionic liquids; (3) use of bio-electrochemical processes (microbial fuel cells and microbial electrolysis cells) and (4) integration of electrodeposition with other processes (bioleaching, adsorption, membrane processes, etc.). This would increase the awareness about the importance of the technology and would serve as a starting point for anyone that aims to start working in the field.

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Electrochemical extraction of palladium from spent heterogeneous catalysts of a petrochemical unit using the leaching and flat plate graphite electrodes

Cited by 9 publications

References 65 publications

Electrometallurgical recovery of nickel and vanadium from spent desulphurization catalysts using an acidic leaching–electrolysis technique

Electrometallurgical recovery of nickel and vanadium from spent desulphurization catalysts using an acidic leaching–electrolysis technique

Recovery of Homogeneous Platinoid Catalysts from Pharmaceutical Media: Review on the Existing Treatments and the Perspectives of Membrane Processes

An Old Technique with A Promising Future: Recent Advances in the Use of Electrodeposition for Metal Recovery

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