Robust CNT-based conductive ultrafiltration membrane with tunable surface potential for in situ fouling mitigation

Mao, Hengyang; Qiu, Minghui; Zhang, Tianyu; Chen, Xianfu; Da, Xiaowei; Jing, Wenheng; Fan, Yiqun

doi:10.1016/j.apsusc.2019.143786

Cited by 21 publications

(6 citation statements)

References 57 publications

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“…Consequently, H 2 O 2 was activated by Fe(II) into •OH and 1 O 2 to oxidize HA molecules, preventing the blockage of pores. Besides, the tiny bubbles yielded from the cathodic hydrogen evolution reaction hampered the formation of the compact cake layer, making the foulant easy to remove . The aforementioned results confirmed that FE-ECM with superior catalytic reactivity and beneficial surficial properties, including a rougher and hydrophilic surface, synergistically contributed to superior fouling control performance.…”

Section: Resultsmentioning

confidence: 61%

“…In addition, the production of tiny bubbles from the cathodic reduction of H + (eq 15) was beneficial to form a loose cake layer, which was easily removed via hydraulic backwash (optical photographs are depicted in Figure S17). 50,51 As a result, FE-ECM reached the highest flux recovery with 95.62%, superior to those of ECM (89.36%) and BCM (80.69%). Radical scavenger experiments were employed to quantify the contribution of •OH and 1 O 2 toward fouling control performance.…”

Section: Fouling Control Performancementioning

confidence: 93%

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Fe(II)-Modulated Microporous Electrocatalytic Membranes for Organic Microcontaminant Oxidation and Fouling Control: Mechanisms of Regulating Electron Transport toward Enhanced Reactive Oxygen Species Activation

Yang

Luo

et al. 2023

Environ. Sci. Technol.

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Regulation of the fast electron transport process for the generation and utilization of reactive oxygen species (ROS) by achieving fortified electron "nanofluidics" is effective for electrocatalytic oxidation of organic microcontaminants. However, limited available active sites and sluggish mass transfer impede oxidation efficiency. Herein, we fabricated a conductive electrocatalytic membrane decorated with hierarchical porous vertically aligned Fe(II)-modulated FeCo layered double hydroxide nanosheets (Fe(II)-FeCo LDHs) in an electro-Fenton system to maximize exposure of active sites and expedite mass transfer. The nanospaced interlayers of Fe(II)-FeCo LDHs within the microconfined porous structure formed by its vertical nanosheets highly boost the micro/nanofluidic distribution of target pollutants to active centers/species, achieving accelerated mass transferability. Aliovalent substitution by Fe(II) activates in-plane metallics to maximize the available active sites and makes each Fe(II)-FeCo LDH nanosheet a geometrical nanocarrier for constructing a fast electron "nanofluidic" to accelerate Fe(II) regeneration in Fe(III)/Fe(II) cycles. As a result, the Fe(II)-FeCo LDHs exhibited improved reactivity in catalyzing H 2 O 2 to •OH and 1 O 2 . Accordingly, the membrane exhibited a higher atrazine degradation kinetic (0.0441 min −1 ) and degradation rate (93.2%), which were 4.7 and 2.1 times more than those of the bare carbon nanotube membrane, respectively. Additionally, the enhanced hydrophilic and strongly oxidized reactivity synergistically mitigated the organic fouling occurring in the pores and surface of the membrane. These findings clarify the activation mechanism of ROS over an innovative electrocatalytic membrane reactor design for organic microcontaminant treatment.

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Section: Resultsmentioning

confidence: 61%

Section: Fouling Control Performancementioning

confidence: 93%

Fe(II)-Modulated Microporous Electrocatalytic Membranes for Organic Microcontaminant Oxidation and Fouling Control: Mechanisms of Regulating Electron Transport toward Enhanced Reactive Oxygen Species Activation

Yang

Luo

et al. 2023

Environ. Sci. Technol.

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“…Transmission electron microscopy is used to study the morphology of the membrane. Impedance spectroscopy is used to study the conductivity of the membrane [32,55].…”

Section: Characterization Of Electrofiltrationmentioning

confidence: 99%

“…Numerous studies in electrofiltration have introduced novel membrane materials in experimental setups and demonstrated improved performance with the assistance of an electric field. popular category of membrane modification is the fabrication of conductive membranes or membrane coating with conductive materials [31,44,55,74,109]. Such membranes enable effective exploitation of electrolysis and electrophoresis.…”

Section: Membrane Materials and Modificationsmentioning

confidence: 99%

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A Critical Review on Electric Field-Assisted Membrane Processes: Implications for Fouling Control, Water Recovery, and Future Prospects

Shen¹,

Badireddy²

2021

Membranes

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Electrofiltration, an electric field-assisted membrane process, has been a research topic of growing popularity due to its ability to improve membrane performance by providing in situ antifouling conditions in a membrane system. The number of reports on electrofiltration have increased exponentially over the past two decades. These reports explored many innovations, such as novel configurations of an electric field, engineered membrane materials, and interesting designs of foulant compositions and membrane modules. Recent electrofiltration literature focused mainly on compiling results without a comprehensive comparative analysis across different works. The main objective of this critical review is to, first, organize, compare and contrast the results across various electrofiltration studies; second, discuss various types of mechanisms that could be incorporated into electrofiltration and their effect on membrane system performance; third, characterize electrofiltration phenomenon; fourth, interpret the effects of various operational conditions on the performance of electrofiltration; fifth, evaluate the state-of-the-art knowledge associated with modeling efforts in electrofiltration; sixth, discuss the energy costs related to the implementation of electrofiltration; and finally, identify the current knowledge gaps that hinder the transition of the lab-scale observations to industry-scale electrofiltration as well as the future prospects of electrofiltration.

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An electrochemical and magnetic approach for /H2SO4/HNO3/chitosan functionalized multi-wall carbon nanotubes stable solutions

Holanda

Cabral

Ladchumananandasivam

et al. 2022

J Mater Sci: Mater Electron

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Robust CNT-based conductive ultrafiltration membrane with tunable surface potential for in situ fouling mitigation

Cited by 21 publications

References 57 publications

Fe(II)-Modulated Microporous Electrocatalytic Membranes for Organic Microcontaminant Oxidation and Fouling Control: Mechanisms of Regulating Electron Transport toward Enhanced Reactive Oxygen Species Activation

Fe(II)-Modulated Microporous Electrocatalytic Membranes for Organic Microcontaminant Oxidation and Fouling Control: Mechanisms of Regulating Electron Transport toward Enhanced Reactive Oxygen Species Activation

A Critical Review on Electric Field-Assisted Membrane Processes: Implications for Fouling Control, Water Recovery, and Future Prospects

An electrochemical and magnetic approach for /H2SO4/HNO3/chitosan functionalized multi-wall carbon nanotubes stable solutions

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