Carbon nanotubes intercalated RGO electro-Fenton membrane for coenhanced permeability, rejection and catalytic oxidation of organic micropollutants

Jiang, Wenli; Haider, Muhammad Rizwan; Han, Jinglong; Ding, Yangcheng; Li, Xi-Qi; Wang, Hongcheng; Sharif, Hafiz Muhammad Adeel; Wang, Aijie; Ren, Nanqi

doi:10.1016/j.memsci.2021.119069

Cited by 33 publications

(15 citation statements)

References 41 publications

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“…In such way, the selectivity of the oxidation is achieved based on the different molecular size between targets and competing compounds. Consequently, in water treatment, a tandem process of size exclusion and oxidation could be used to degrade the target compounds with high selectivity and efficiency, for instance, to remove micropollutants in the complicated water matrix against the macromolecular DOM. − …”

Section: Selective Oxidation Via Tuning the Accessibility Of Targets ...mentioning

confidence: 99%

“…In another example, carbon nanotubes were intercalated into a reduced graphene oxide based electro-Fenton membrane to allow the permeation of positively charged small molecules, while the targets with larger size and negative charge were rejected. The rejected compounds were concentrated on the surface of the membrane for further oxidation in the electro-Fenton system …”

Section: Selective Oxidation Via Tuning the Accessibility Of Targets ...mentioning

confidence: 99%

“…One typical case is the membranebased oxidation, in which membranes with various pore sizes are used to physically reject compounds of large molecular size, allowing the permeation of small molecules for further inside oxidation (Figure 5a). 200,205,207,208 Ren et al casted a polyvinylidene fluoride ultrafiltration membrane on a support layer embedded with MIL-53(Fe) to catalyze Fenton-like reaction. The membrane could effectively reject the coexisting large molecules including bovine serum albumin, dextran, and humic acid, achieving selective oxidation of bisphenol S. 208 It was further demonstrated in bisphenol S removal from the secondary effluent containing 7.8 mg L −1 TOC, 14 mg L −1 suspended solid, and 17 mg L −1 TN.…”

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confidence: 99%

“…The rejected compounds were concentrated on the surface of the membrane for further oxidation in the electro-Fenton system. 207 The size exclusion based selective oxidation strategy inspired the design of nanoconfined catalytic system, where the reactive catalytic sites are confined inside nanosized pores (Figure 5d). Examples include catalysts with core−shell structure and catalysts with active sites distributed inside the nanosized channels, in which the porous shell or the nanochannel excludes large molecules.…”

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Toward Selective Oxidation of Contaminants in Aqueous Systems

Yang

Qian

Shan

et al. 2021

Environ. Sci. Technol.

188

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The presence of diverse pollutants in water has been threating human health and aquatic ecosystems on a global scale. For more than a century, chemical oxidation using strongly oxidizing species was one of the most effective technologies to destruct pollutants and to ensure a safe and clean water supply. However, the removal of increasing amount of pollutants with higher structural complexity, especially the emerging micropollutants with trace concentrations in the complicated water matrix, requires excessive dosage of oxidant and/ or energy input, resulting in a low cost-effectiveness and possible secondary pollution. Consequently, it is of practical significance but scientifically challenging to achieve selective oxidation of pollutants of interest for water decontamination. Currently, there are a variety of examples concerning selective oxidation of pollutants in aqueous systems. However, a systematic understanding of the relationship between the origin of selectivity and its applicable water treatment scenarios, as well as the rational design of catalyst for selective catalytic oxidation, is still lacking. In this critical review, we summarize the state-of-the-art selective oxidation strategies in water decontamination and probe the origins of selectivity, that is, the selectivity resulting from the reactivity of either oxidants or target pollutants, the selectivity arising from the accessibility of pollutants to oxidants via adsorption and size exclusion, as well as the selectivity due to the interfacial electron transfer process and enzymatic oxidation. Finally, the challenges and perspectives are briefly outlined to stimulate future discussion and interest on selective oxidation for water decontamination, particularly toward application in real scenarios.

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Section: Selective Oxidation Via Tuning the Accessibility Of Targets ...mentioning

confidence: 99%

Section: Selective Oxidation Via Tuning the Accessibility Of Targets ...mentioning

confidence: 99%

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confidence: 99%

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confidence: 99%

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Toward Selective Oxidation of Contaminants in Aqueous Systems

Yang

Qian

Shan

et al. 2021

Environ. Sci. Technol.

188

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“…Pressure deposition or dip coating the membrane in a precursor solution is the easiest approach to introduce nanomodifiers onto the membrane surface. Pressurized filtration has been used to coat carbon-based NPs, including carbon nanotubes (CNTs), , carbon nanofibers (CNFs), cellulose nanocrystals (CNCs), graphene oxide (GO), and reduced graphene oxide (rGO). , Of them, two-dimensional (2D) nanomaterials such as GO and rGO have emerged as popular coating materials to make adsorptive membranes due to ultrathin layers, high surface areas, and good chemical stabilities. , rGO can also make membrane conductive layers for electrochemical degradation of various OMPs. , Nonetheless, challenges exist as GO-coated membranes show poor stability under cross-flow conditions due to GO swelling . Pristine GO- or rGO-coated membranes have low flux due to short d -spacings of GO and rGO laminates (0.8 and 0.35 nm, respectively) .…”

Section: Nanocomposite Polymeric Membranes For Omp Removalmentioning

confidence: 99%

Nanocomposite Polymeric Membranes for Organic Micropollutant Removal: A Critical Review

Chen

Lee

et al. 2022

ACS EST Eng.

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The prevalence of organic micropollutants (OMPs) and their persistence in water supplies have raised serious concerns for drinking water safety and public health. Conventional water treatment technologies, including adsorption and biological treatment, are known to be insufficient in treating OMPs and have demonstrated poor selectivity toward a wide range of OMPs. Pressure-driven membrane filtration has the potential to remove many OMPs detected in water with high selectivity as a membrane's molecular weight cutoff (MWCO), surface charge, and hydrophilicity can be easily tailored to a targeted OMP's size, charge and octanol−water partition coefficient (K ow ). Over the past 10 years, polymeric (nano)composite microfiltration (MF), ultrafiltration (UF), and nanofiltration (NF) membranes have been extensively synthesized and studied for their ability to remove OMPs. This review discusses the fate and transport of emerging OMPs in water, an assessment of conventional membrane-based technologies (NF, reverse osmosis (RO), forward osmosis (FO), membrane distillation (MD) and UF membrane-based hybrid processes) for their removal, and a comparison to the state-of-the-art nanoenabled membranes with enhanced selectivity toward specific OMPs in water. Nanoenabled membranes for OMP treatment are further discussed with respect to their permeabilities, enhanced properties, limitations, and future improvements.

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