Reinforcing hydration layer on membrane surface via nano-capturing and hydrothermal crosslinking for fouling reduction

Xiong, Zhu; Liu, Jiang-Tao; Yang, Yang; Lai, Qiaoyun; Wu, Xueyan; Yang, Jingshuai; Zeng, Qingyi; Zhang, Gaosheng; Zhao, Shuaifei

doi:10.1016/j.memsci.2021.120076

Cited by 22 publications

(8 citation statements)

References 52 publications

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“…Such improved water affinity is beneficial for enhancing electrolyte–electrocatalyst contact during electrochemical reductive dechlorination. Greater surface hydrophilicity is also generally beneficial for reducing the resistance to water permeance across the membrane and in reducing organic fouling by forming a strong surface hydration layer. , …”

Section: Resultsmentioning

confidence: 99%

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Electrically Conductive Ni-P Nanoporous Membrane Reactors for Electrochemical Reductive Dechlorination of Organic Pollutants

Zhang

Ganzoury

et al. 2023

ACS Appl. Nano Mater.

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Transition-metal phosphides (TMPs) are emerging electrocatalysts for both hydrogen evolution and the conversion of reactants/contaminants by various electrochemical reactions. TMPs are promising catalysts because they are earth abundant, have high electrical conductivity, and have high chemical stability. In this seminal work, a low-priced nickel phosphorus (Ni-P) ultrafiltration membrane was fabricated and used for electrochemical reductive dechlorination of chlorophenols. Amorphous Ni-P nanoparticles were grown on an ultrafiltration poly(ether sulfone) (PES) membrane via electroless deposition. The prepared Ni-P membrane was used as a cathode for electrochemical reductive dechlorination of 2-chlorophenol (2-CP) in flow-through mode. It was observed that a dechlorination efficiency of 42.7%, a reaction rate constant of 1.621 min–1, and a Faradaic efficiency of 24.5% were achieved at an optimized cathodic potential of −2.50 V. The dechlorination was primarily attributed to the partial positively charged Niδ+ on the Ni-P membrane surface, which facilitated atomic H* evolution by forming reactive Ni–H* bonds for dechlorination. Additionally, doping P atoms in Ni retarded the deactivation of electrocatalytic Ni sites. This work demonstrates that the cost-effective Ni-P membrane electrocatalyst is a promising technology to degrade chlorinated compounds with applications to industrial wastewaters and landfill leachates.

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Section: Resultsmentioning

confidence: 99%

“…Greater surface hydrophilicity is also generally beneficial for reducing the resistance to water permeance across the membrane and in reducing organic fouling by forming a strong surface hydration layer. 40,41 3.2.3. Structure.…”

Section: Membrane Characterizationmentioning

confidence: 99%

Electrically Conductive Ni-P Nanoporous Membrane Reactors for Electrochemical Reductive Dechlorination of Organic Pollutants

Zhang

Ganzoury

et al. 2023

ACS Appl. Nano Mater.

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“…To balance the ionic conductivity, dimensional stability, and acid/base stability of the AEMs, various strategies have been employed. Cross-linking is an effective technique to create a linear polymer cross-networked structure through a chemical/physical reaction. , This can minimize the water absorption rates and swelling degrees, consequently improving the membrane separation efficiency. − For example, Lai et al utilized N , N , N ′, N ′-tetramethyl-1,6-diaminohexane and 1,2-dimethylimidazole as cross-linker agents to prepare poly(aryl ether sulfone) AEMs, enhancing their dimensional stability by cross-linking ion cluster regions . However, adding multiple cross-linkers increases the electrical resistance of the membrane surface, and the process typically requires at least two steps to complete a cross-linking reaction, limiting its application .…”

Section: Introductionmentioning

confidence: 99%

Internally Cross-Linked Polysulfone-Based Anion Exchange Membranes with pH Stability for Carboxylate Separation

Lan,

Huang,

Zhou

et al. 2023

ACS EST Water

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“…16,18,19 Among them, engineering antifouling membranes plays a crucial role in addressing the fouling problem. 20,21 Various methods such as surface modification, grafting, and blending with organic or inorganic hydrophilic materials have been used to develop antifouling membranes. 22−24 However, each method or material has its own drawbacks.…”

Section: Introductionmentioning

confidence: 99%

“…Many strategies, such as pretreatment of the feed solution, physical or chemical cleaning, optimizing the operational conditions, and developing antifouling and/or self-cleaning membranes, have been employed to minimize membrane fouling. ,, Among them, engineering antifouling membranes plays a crucial role in addressing the fouling problem. , Various methods such as surface modification, grafting, and blending with organic or inorganic hydrophilic materials have been used to develop antifouling membranes. − However, each method or material has its own drawbacks. For instance, surface modification may face the issues of increased transfer resistance (i.e., lower permeability) and performance decay due to the weak interaction between the surface and the coating material.…”

Section: Introductionmentioning

confidence: 99%

Confining Nano-Fe₃O₄ in the Superhydrophilic Membrane Skin Layer to Minimize Internal Fouling

Xiong

Huang

et al. 2022

ACS Appl. Mater. Interfaces

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Membrane surface fouling is often reversible as it can be mitigated by enhancing the crossflow shear force. However, membrane internal fouling is often irreversible and thus more challenging. In this study, we developed a new superhydrophilic poly(vinylidene fluoride) (P-PVDF) membrane confined with nano-Fe 3 O 4 in the top skin layer via reverse filtration to reduce internal fouling. The surface of the P-PVDF membrane confined with nano-Fe 3 O 4 had superwetting properties (water contact angle reaching 0°within 1 s), increased roughness (from 182 to 239 nm), and enhanced water affinity. The Fe 3 O 4 @P-PVDF membrane surface showed a thicker and enhanced hydration layer, which prevented foulants from approaching membrane surfaces and pores, thereby improving the rejection. For example, when 50 ppm humic acid (HA) solution was used as the feed, the removal efficiency of the Fe 3 O 4 @P-PVDF membrane was ∼67%, while the HA removal of the P-PVDF membrane was only ∼20%. The results from the resistance-in-series model showed that nanoconfinement of Fe 3 O 4 in the top skin layer of the membrane allowed foulants to accumulate on the membrane surface (i.e., surface fouling) rather than within the internal pores (i.e., internal fouling). The filtration results under crossflow fouling and cleaning confirmed that the Fe 3 O 4 @P-PVDF membrane had higher surface fouling but it was much more reversible and much lower internal fouling compared with the control membrane. Our fouling analysis offers new insights into mass transfer mechanisms of the membrane with a nanoconfinement-enhanced hydration layer. This study provides an effective strategy to develop membranes with low internal fouling propensities.

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Reinforcing hydration layer on membrane surface via nano-capturing and hydrothermal crosslinking for fouling reduction

Cited by 22 publications

References 52 publications

Electrically Conductive Ni-P Nanoporous Membrane Reactors for Electrochemical Reductive Dechlorination of Organic Pollutants

Electrically Conductive Ni-P Nanoporous Membrane Reactors for Electrochemical Reductive Dechlorination of Organic Pollutants

Internally Cross-Linked Polysulfone-Based Anion Exchange Membranes with pH Stability for Carboxylate Separation

Confining Nano-Fe₃O₄ in the Superhydrophilic Membrane Skin Layer to Minimize Internal Fouling

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Reinforcing hydration layer on membrane surface via nano-capturing and hydrothermal crosslinking for fouling reduction

Cited by 22 publications

References 52 publications

Electrically Conductive Ni-P Nanoporous Membrane Reactors for Electrochemical Reductive Dechlorination of Organic Pollutants

Electrically Conductive Ni-P Nanoporous Membrane Reactors for Electrochemical Reductive Dechlorination of Organic Pollutants

Internally Cross-Linked Polysulfone-Based Anion Exchange Membranes with pH Stability for Carboxylate Separation

Confining Nano-Fe3O4 in the Superhydrophilic Membrane Skin Layer to Minimize Internal Fouling

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Product

Resources

About

Confining Nano-Fe₃O₄ in the Superhydrophilic Membrane Skin Layer to Minimize Internal Fouling