MXene‐Based Membranes for Separation Applications

Huang, Lingzhi; Ding, Li; Wang, Haihui

doi:10.1002/smsc.202100013

Cited by 59 publications

(26 citation statements)

References 110 publications

(127 reference statements)

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“…[1a] A good combination of these fascinating merits renders high promise of MXenes in vast applications such as energy, catalysis, superconductor, electromagnetic shielding, biotherapy and edge-cutting smart technologies, etc. [5] However, the MXenes generally suffer fast structural degradation by oxidation in aqueous solution, which greatly shortens their storage life and makes practical use difficult. [6] The reaction of MXenes with dissolved oxygen can be limited in short days by protecting them in the solution saturated with inert gas.…”

mentioning

confidence: 99%

Stabilizing MXene by Hydration Chemistry in Aqueous Solution

Wang

Qiu

2021

Angew Chem Int Ed

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MXenes attract interest in diverse fields but suffer from fast structural degradation by attacking of dissolved oxygen and water molecules in aqueous solution. This drawback hinders the long‐term storage, applications and understanding of the chemical nature of MXenes. Herein, we report a cost‐effective and environmentally sustainable way for long‐term storage of MXenes in aqueous solution by hydration chemistry of nontoxic inorganic salts. The attacking of MXene by free water and dissolved oxygen molecules is inhibited by decreasing the water activity, which simultaneously lowers the dissolved oxygen concentration, of saline solution. As a result, the storage life of MXene can be prolonged to up to 400 days at ambient conditions without loss of intrinsic surface chemistry and bulk carrier properties. Over 90 % of salt protectant can be recycled by simply evaporating the final waste liquor after fully extracting the MXene to minimize the waste discharge and processing cost. This work offers a commercializable approach with high cost‐effectiveness, processing sustainability and environmental benefit for extending the shelf life of MXenes.

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mentioning

confidence: 99%

Stabilizing MXene by Hydration Chemistry in Aqueous Solution

Wang

Qiu

2021

Angew Chem Int Ed

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“…Due to key advantages of a high separation efficiency and compact plant size, filtration techniques such as, microfiltration (MF), ultrafiltration (UF), reverse osmosis (RO), dynamic membranes (DM), and MBRs, have been shown to be feasible to produce high quality water from primary or secondary effluent. [82,83] By using the asymmetric membranes with micrometer or nanometer-sized pores, the impurities including bacteria, protozoa, viruses, and the suspended solids can be effectively removed. Although UF and RO have exhibited the good efficiency for MPs removal in WWTPs, millions of MPs still remained in the effluent after these treatments.…”

Section: Membrane-based Filtrationmentioning

confidence: 99%

How to Build a Microplastics‐Free Environment: Strategies for Microplastics Degradation and Plastics Recycling

et al. 2022

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Microplastics are an emergent yet critical issue for the environment because of high degradation resistance and bioaccumulation. Unfortunately, the current technologies to remove, recycle, or degrade microplastics are insufficient for complete elimination. In addition, the fragmentation and degradation of mismanaged plastic wastes in environment have recently been identified as a significant source of microplastics. Thus, the developments of effective microplastics removal methods, as well as, plastics recycling strategies are crucial to build a microplastics‐free environment. Herein, this review comprehensively summarizes the current technologies for eliminating microplastics from the environment and highlights two key aspects to achieve this goal: 1) Catalytic degradation of microplastics into environmentally friendly organics (carbon dioxide and water); 2) catalytic recycling and upcycling plastic wastes into monomers, fuels, and valorized chemicals. The mechanisms, catalysts, feasibility, and challenges of these methods are also discussed. Novel catalytic methods such as, photocatalysis, advanced oxidation process, and biotechnology are promising and eco‐friendly candidates to transform microplastics and plastic wastes into environmentally benign and valuable products. In the future, more effort is encouraged to develop eco‐friendly methods for the catalytic conversion of plastics into valuable products with high efficiency, high product selectivity, and low cost under mild conditions.

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“…Generally, it is not responsive to external stimuli due to its unchangeable physical/chemical structures. There are many types of functional membranes such as inorganic-based membranes: MXene, [69][70][71][72] layered double hydroxide, [73][74][75] zeolite & layered silicate, [76][77][78] and transition metal dichalcogenides. [79][80][81] There are also organic-based membranes such as the covalent organic framework (COF), 82,83 carbon-based membranes including graphene [84][85][86] and graphene oxide (GO), [87][88][89] and hybrid membranes such as the metal-organic frameworks (MOF).…”

Section: Overview Of the Functional Membranes For Gas Separationmentioning

confidence: 99%