具有开放直孔的分层定向碳纳米管/粉煤灰 Janus 膜，可提高太阳能海水淡化性能

IF 5.1 2区材料科学 Q1 MATERIALS SCIENCE, CERAMICS

Ceramics International Pub Date : 2024-12-15 DOI:10.1016/j.ceramint.2024.10.127

Jia Wang , Yingsheng Li , Yao Wang , Tong Liu , Mingyue Ding

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引用次数: 0

摘要

通过太阳能光热膜蒸馏技术进行海水淡化是解决淡水短缺的有效途径，而制备具有优异太阳能淡化性能的 Janus 膜以提高透水性能非常重要。本研究采用传统的胶带浇注或相反转胶带浇注技术，制备了三种典型的疏水碳纳米管/亲水粉煤灰（CNTs/FA）非对称膜，它们具有不同的膜支撑结构，可用于太阳能海水淡化。结果表明，通过操纵粉煤灰膜支撑物的微观结构，氮渗透率从曲折的 CNTs/FA Janus 膜的（4.81±0.17）×105 L m-2 h-1 bar-1 显著提高到具有开放直孔的分层取向 CNTs/FA Janus 膜的（9.28±0.10）×106 L m-2 h-1 bar-1。此外，相应的蒸发率也从 0.633±0.010 大幅度提高到 1.669±0.010 kg m-2 h-1，这在很大程度上归因于具有开放直孔的分层取向 FA 膜支撑中水的加速渗透。此外，我们的研究结果证明，通过对膜支持物微观结构的处理，可以大大提高太阳能海水淡化的性能，并为开发新型高效太阳能海水淡化膜提供指导。

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Hierarchically oriented carbon nanotubes/fly ash Janus membrane with open, straight pores for enhanced solar desalination performance

Seawater desalination via the solar membrane distillation (SMD) technology is an effective way to solve the fresh water shortage, and it is very important to prepare a Janus membrane with excellent solar desalination properties to improve the water permeability. In this work, three typical hydrophobic carbon nanotubes/hydrophilic fly ash (CNTs/FA) Janus asymmetric membranes with different membrane support structures are prepared for SMD application by the conventional tape casting or phase inversion tape casting techniques. It is demonstrated that nitrogen permeability is significantly enhanced from (4.81 ± 0.17) × 10⁵ L m^-2 h^-1 bar^-1 for the tortuous CNTs/FA Janus membrane to (9.28 ± 0.10) × 10⁶ L m^-2 h^-1 bar^-1 for the hierarchically oriented CNTs/FA Janus membrane with open, straight pores by manipulating the microstructure of the FA membrane support. Moreover, the corresponding evaporation rate is strongly increased from 0.633 ± 0.010 to 1.669 ± 0.010 kg m^-2 h^-1, which is greatly ascribed to the accelerated water permeation in the hierarchically oriented FA membrane support with open, straight pores. Additionally Our findings proves that the SMD performance can be greatly improved by the microstructure manipulation of the membrane support, and guide the development of novel membranes for efficient solar desalination.

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来源期刊

Ceramics International 工程技术-材料科学：硅酸盐

CiteScore

9.40

自引率

15.40%

发文量

4558

审稿时长

25 days

期刊介绍： Ceramics International covers the science of advanced ceramic materials. The journal encourages contributions that demonstrate how an understanding of the basic chemical and physical phenomena may direct materials design and stimulate ideas for new or improved processing techniques, in order to obtain materials with desired structural features and properties. Ceramics International covers oxide and non-oxide ceramics, functional glasses, glass ceramics, amorphous inorganic non-metallic materials (and their combinations with metal and organic materials), in the form of particulates, dense or porous bodies, thin/thick films and laminated, graded and composite structures. Process related topics such as ceramic-ceramic joints or joining ceramics with dissimilar materials, as well as surface finishing and conditioning are also covered. Besides traditional processing techniques, manufacturing routes of interest include innovative procedures benefiting from externally applied stresses, electromagnetic fields and energetic beams, as well as top-down and self-assembly nanotechnology approaches. In addition, the journal welcomes submissions on bio-inspired and bio-enabled materials designs, experimentally validated multi scale modelling and simulation for materials design, and the use of the most advanced chemical and physical characterization techniques of structure, properties and behaviour. Technologically relevant low-dimensional systems are a particular focus of Ceramics International. These include 0, 1 and 2-D nanomaterials (also covering CNTs, graphene and related materials, and diamond-like carbons), their nanocomposites, as well as nano-hybrids and hierarchical multifunctional nanostructures that might integrate molecular, biological and electronic components.