Enhancing destruction of copper (I) cyanide and subsequent recovery of Cu(I) by a novel electrochemical system combining activated carbon fiber and stainless steel cathodes

Chen, Fayuan; Hu, Chengzhi; Sun, Mengtao; Liu, Huijuan; Qu, Jiuhui; Tao, Zhiying

doi:10.1016/j.cej.2017.08.075

Cited by 27 publications

(5 citation statements)

References 35 publications

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“…Besides, the production of H 2 O 2 also increased with the increase of cell voltage, resulting in the increase of • OH radicals (Figure S21). However, the efficiency of H 2 PO 2 – oxidation and P recovery was slightly slowed down when the cell voltage reached up to 3.5 V, which was due to the decrease of • OH radicals caused by the enhancement of parasitic side reactions . Therefore, the optimized cell voltage for H 2 PO 2 – oxidation and P recovery was selected as 3.0 V.…”

Section: Resultsmentioning

confidence: 99%

Recovery of Phosphorus from Hypophosphite-Laden Wastewater: A Single-Compartment Photoelectrocatalytic Cell System Integrating Oxidation and Precipitation

Zhang

Zhao

Djellabi

2019

Environ. Sci. Technol.

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Recovery of phosphorus through precipitation from hypophosphite-laden wastewater is more difficult than from orthophosphate-laden wastewater because of the higher solubility of hypophosphite (H 2 PO 2 − ). Herein, a single-compartment photoelectrocatalytic (PEC) cell system consisting of a TiO 2 /Ni−Sb−SnO 2 bifunctional photoanode and an activated carbon fiber (ACF) cathode with dosing Fe 2+ ions was developed for recovery of phosphorus in the form of FePO 4 from hypophosphite-laden wastewater. In the PEC process, H 2 PO 2 − with an initial concentration of 1.0 mM was completely oxidized and recovered within 30 min at 3.0 V, and the pseudo-first-order rate constant of H 2 PO 2 − oxidation was ∼4 times than that in the electrocatalytic process and even ∼89 times than that in the photocatalytic process. The bifunctional photoanode can simultaneously generate • OH radicals and O 3 ; the ACF cathode can electrogenerate H 2 O 2 ; H 2 O 2 , O 3 , and the added Fe 2+ can interact with each other to produce • OH radicals and Fe 3+ ions. • OH radicals mainly from the Fenton process were responsible for oxidation of H 2 PO 2 − to PO 4 3− , which immediately combined with Fe 3+ to form FePO 4 at the optimized conditions to realize recovery of phosphorus. The long-term stability of this system was demonstrated. The efficiency for actual electroless nickel plating effluents was exhibited.

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Section: Resultsmentioning

confidence: 99%

Recovery of Phosphorus from Hypophosphite-Laden Wastewater: A Single-Compartment Photoelectrocatalytic Cell System Integrating Oxidation and Precipitation

Zhang

Zhao

Djellabi

2019

Environ. Sci. Technol.

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“…Biomass carbon fibers are further activated to prepare activated carbon fibers (ACFs). ACF, a highly porous material in the form of fibers, is effective in adsorption applications owing to its high specific surface area and uniform micropore volume, rapid adsorption, desorption rate, and easy regeneration. − …”

Section: Introductionmentioning

confidence: 99%

Cotton-Based Activated Carbon Fiber with High Specific Surface Area Prepared by Low-Temperature Hydrothermal Carbonization with Urea Enhancement

Luo

Chen

et al. 2023

Ind. Eng. Chem. Res.

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The traditional preparation method of activated carbon fiber is high-temperature carbonization and activation. In this experiment, cotton-based activated carbon fiber was prepared by urea-enhanced low-temperature hydrothermal carbonization and activation method. A specific surface area of 2304.8 m2/g of activated carbon fiber prepared by low-temperature hydrothermal carbonization with urea enhancement was the maximum reported using biomass as a raw material, which was higher than that of activated carbon fibers prepared by other biomass raw materials. X-ray photoelectron spectroscopy and elemental analysis studies have shown that the form of N transformed and decomposed during the high-temperature process, leading to the separation of C–N. Thermogravimetry mass spectrometry characterization analysis found that K2CO3 of low-temperature hydrothermal-assisted KOH activation may fully react with the N-containing group produced during the carbonization process to generate NH3, which lead to the formation of more pore structures in the carbon materials. The adsorption capacity of activated carbon fiber activated by hydrothermal-assisted KOH for iodine could reach up to 2254.8 mg/g. This process provides a new idea for the preparation of high-performance activated carbon fibers.

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“…Despite the abundance of metal-laden wastewaters, conventional technologies, such as adsorption, chemical precipitation, and ion exchange, are incapable of sufficient metal recovery, owing to their technical limitations in reducing these oxidized metal ions. − In recent years, various high-performance electrochemical (EC) approaches, including electrodeposition and electrodialysis, were developed to reclaim copper, , gold, silver, nickel, and lead from wastewater by applying an electric potential to drive metal reduction reactions. EC approaches have become the dominant technique for metal recovery as they are highly selective for a broad range of metal ions and are easy to operate.…”

Section: Introductionmentioning

confidence: 99%

Electrochemical-Osmotic Process for Simultaneous Recovery of Electric Energy, Water, and Metals from Wastewater

Sun

Qin

Wang

et al. 2020

Environ. Sci. Technol.

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A highly-efficient, autonomous electrochemical-osmotic system (EOS) is developed for simultaneous recovery of electric energy, water, and metals from wastewater. We demonstrate that the system can generate a maximum electric power density of 10.5 W m −2 using a spontaneous Fe/Cu 2+ galvanic cell, while simultaneously achieving copper recovery from wastewater. With an osmotic pressure difference generated by the deployed electrochemical reactions, water is osmotically extracted from the feed solution with the EOS at a water flux of 5.1 L m −2 h −1 . A scaled-up EOS realizes a power density of 105.8 W per m −3 of treated water to light an LED over 24 h while also enhancing water extraction and metal recovery. The modularized EOS obtains ultrahigh (>97.5%) Faradaic efficiencies under variable operating conditions, showing excellent system stability. The EOS is also versatile: it can recover Au, Ag, and Hg from wastewaters with simultaneous electricity and water coproduction. Our study demonstrates a promising pathway for realizing multiresource recycling from wastewater by coupling electrochemical and osmosis-driven processes.

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Enhancing destruction of copper (I) cyanide and subsequent recovery of Cu(I) by a novel electrochemical system combining activated carbon fiber and stainless steel cathodes

Cited by 27 publications

References 35 publications

Recovery of Phosphorus from Hypophosphite-Laden Wastewater: A Single-Compartment Photoelectrocatalytic Cell System Integrating Oxidation and Precipitation

Recovery of Phosphorus from Hypophosphite-Laden Wastewater: A Single-Compartment Photoelectrocatalytic Cell System Integrating Oxidation and Precipitation

Cotton-Based Activated Carbon Fiber with High Specific Surface Area Prepared by Low-Temperature Hydrothermal Carbonization with Urea Enhancement

Electrochemical-Osmotic Process for Simultaneous Recovery of Electric Energy, Water, and Metals from Wastewater

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