Photoelectrocatalytic oxidation of metal-EDTA and recovery of metals by electrodeposition with a rotating cathode

Chen, Yutong; Zhao, Xu; Guan, Wei; Cao, Di; Guo, Tao; Zhang, Xiufang; Wang, Yan

doi:10.1016/j.cej.2017.05.031

Cited by 46 publications

(18 citation statements)

References 27 publications

(31 reference statements)

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“…For τ > 0, both disks corotate and there is a progressive acceleration in tangential flow. The rotational velocity of the lower disk relative to that of the upper disk steadily increases as τ increases from 0.2 through 0.4 to 0.6; however, the case of equal disk rotational velocities ( τ = 1) is not considered as it is not relevant to bioreactor designs . Interestingly the tangential flow exhibits a linear decay from the lower disk to the upper disk, which is distinctly different from the parabolic and undulatory profiles characterizing the radial velocity distributions discussed earlier.…”

Section: Resultsmentioning

confidence: 90%

“…The viscous flow from a rotating disk (often termed “von Karman swirling flow”) or in the gap between a dual rotating disk system arises in many intriguing applications in the chemical and process engineering industries. These include biological filtration (where porous media feature), spacecraft landing gear lubrication, rotating cathode electrochemistry, hybrid swirl magnetohydrodynamic propulsion engines, photocatalytic environmental water purification, polymer rheometry (for drag reduction studies), hydrogenation processes, thermal magnetic materials processing, biofuel manufacture, and atomization systems . These systems provide a rich arena for hydrodynamic studies.…”

Section: Introductionmentioning

confidence: 99%

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Numerical study of heat transfer and viscous flow in a dual rotating extendable disk system with a non‐Fourier heat flux model

Shamshuddin

Mishra

Bég

et al. 2018

Heat Trans. Asian Res.

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Nonlinear, steady‐state, viscous flow, and heat transfer between two stretchable rotating disks spinning at dissimilar velocities are studied with a non‐Fourier heat flux model. A nondeformable porous medium is intercalated between the disks and the Darcy model is used to simulate matrix impedance. The conservation equations are formulated in a cylindrical coordinate system and via the von Karman transformations are rendered into a system of coupled, nonlinear ordinary differential equations. The emerging boundary value problem is controlled by number of dimensionless parameters, that is, Prandtl number, upper disk stretching, lower disk stretching, permeability, non‐Fourier thermal relaxation, and relative rotation rate parameters. A perturbation solution is developed and the impact of selected parameters on radial and tangential velocity components, temperature, pressure, lower disk radial, and tangential skin friction components and surface heat transfer rate are visualized graphically. Validation of solutions with the homotopy analysis method is included. Extensive interpretation of the results is presented which are relevant to rotating disk bioreactors in chemical engineering.

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Section: Resultsmentioning

confidence: 90%

Section: Introductionmentioning

confidence: 99%

Numerical study of heat transfer and viscous flow in a dual rotating extendable disk system with a non‐Fourier heat flux model

Shamshuddin

Mishra

Bég

et al. 2018

Heat Trans. Asian Res.

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“…120 The recovery percentage of Cu and destruction of the Cu complexes were increased to be 75.54% and 74.18% from 38.98% and 37.92% by rotating electrode, which enhanced mass transfer rate. 121 Mastering the degradation mechanism of metal complexes is important for the removal of organic matter and the recycle of metals. The metal–EDTA degradation mechanism was the continuous removal of carboxyl groups (Fig.…”

Section: Pretreatment Methods Of Impurities In Electroplating Wastewatermentioning

confidence: 99%

Resource utilization of electroplating wastewater: obstacles and solutions

Dai

et al. 2022

Environ. Sci.: Water Res. Technol.

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“…To address the issues caused by slow material transfer and an unevenly distributed current, previous studies explored the macroconfiguration or hydromechanics transformation, including optimizing the design of electrodes and reactors and enhancing liquid flow. 4,5 Additionally, most methods have attempted to add a concentration process before electrodeposition. 6,7 The regulation of the microinterfacial reaction is also an effective approach to improving the electrodeposition kinetics.…”

Section: ■ Introductionmentioning

confidence: 99%

Potential Oscillated Electrochemical Metal Recovery System with Improved Conversion Kinetics and High Levelized Quality

Chen

Zhang

Shan

et al. 2021

Environ. Sci. Technol.

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Electrodeposition, which is an eco-friendly process with high efficiency, is one of the most promising technologies for metal recovery. However, the kinetics are often limited by the polarization and uncontrollable quality of deposits during the electrodeposition process, which restrict the efficiency and controllability of metal recovery. To ameliorate the limitations of the deposition rate and as-formed deposit quality, transient electrodeposition was introduced to control the microinterfacial reaction by regulating the relationship between charge and mass transfer. The Cu2+ removal efficiency and kinetic coefficient during 1 kHz transient electrodeposition were 17.4 and 17.7% higher than those under the conventional steady electric stimulus, respectively. Based on the combined results of X-ray photoelectron spectroscopy (XPS) and energy-dispersive X-ray spectroscopy (EDS), it was found that the chemical composition of the deposits from transient electrodeposition was more homogenous, as indicated by the low content of metal oxides. The in situ Raman spectra explained the homogenous composition based on the weak interaction of the electrode with the anions during the transient electrodeposition, which was mainly due to the enhanced dehydration under the oscillating or alternating electric field. The potential oscillation induced by the transient electric field also facilitated dehydration, charge transport, and mass transfer, which led to rapid and high-quality metal recovery. Transient electrodeposition will have a great guidance value in the field of metal electroplating and heavy metal recovery from wastewater by electrodeposition.

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Photoelectrocatalytic oxidation of metal-EDTA and recovery of metals by electrodeposition with a rotating cathode

Abstract: h i g h l i g h t sA photoelectro-reactor with a rotating cathode was designed for metal recovery. The cathodic rotation was beneficial for recovery of various metal-EDTA complexes. Recovery ratio of Cu was increased by 36.56% at the rotation speed of 100 rpm.

Cited by 46 publications

References 27 publications

Numerical study of heat transfer and viscous flow in a dual rotating extendable disk system with a non‐Fourier heat flux model

Numerical study of heat transfer and viscous flow in a dual rotating extendable disk system with a non‐Fourier heat flux model

Resource utilization of electroplating wastewater: obstacles and solutions

Potential Oscillated Electrochemical Metal Recovery System with Improved Conversion Kinetics and High Levelized Quality

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