Sandwich morphology and superior dye-removal performances for nanofiltration membranes self-assemblied via graphene oxide and carbon nanotubes

Kang, Hui; Shi, Jie; Liu, Liyan; Shan, Mingjing; Xu, Zhiwei; Li, Nan; Li, Jing; Lv, Hanming; Qian, Xiaoming; Zhao, Lihuan

doi:10.1016/j.apsusc.2017.09.212

Cited by 100 publications

(39 citation statements)

References 51 publications

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“…6d and Table S2. Except the exciting rejection rate, the ZnO/rGO membranes exhibit much higher water permeance than those of the GO-based membranes reported so far (generally less than 80 L m − 2 h − 1 bar − 1 ) [41][42][43][44][45][46][47][48][49][50][51].…”

Section: Resultsmentioning

confidence: 99%

General Synthesis of Ultrafine Metal Oxide/Reduced Graphene Oxide Nanocomposites for Ultrahigh-Flux Nanofiltration Membrane

Zhang¹,

Xu²,

Xie³

et al. 2021

Preprint

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Graphene-based membranes have great potential to revolutionize nanofiltration technology, but achieving high solute rejections at high water flux remains extremely challenging. Herein, a family of ultrafine metal oxide/reduced graphene oxide (rGO) nanocomposites are synthesized through a heterogenous nucleation and diffusion-controlled growth process for dye nanofiltration. The synthesis is based on the utilization of oxygen functional groups on GO surface as preferential active sites for heterogeneous nucleation, leading to the formation of sub-3nm size, monodispersing as well as high-density loading of metal oxide nanoparticles. The anchored ultrafine nanoparticles could inhibit the wrinkling of the rGO nanosheet, forming highly stable colloidal solutions for solution-processing fabrication of nanofiltration membranes. By functioning as pillars, the nanoparticles remarkably increase both vertical interlayer spacing and lateral tortuous paths of the rGO membranes, offering an unprecedented water permeability of 225 L m− 2 h− 1 bar − 1 and a high selectivity up to 98% in the size-exclusion separation of methyl blue.

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Section: Resultsmentioning

confidence: 99%

General Synthesis of Ultrafine Metal Oxide/Reduced Graphene Oxide Nanocomposites for Ultrahigh-Flux Nanofiltration Membrane

Zhang¹,

Xu²,

Xie³

et al. 2021

Preprint

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“…Increasing or limiting the diffusion of gases in the membrane should improve the permeability and selectivity. Nanoporous material such as silica [19,20], zeolites [21,22], metal-organic framework (MOF) [23], graphene [24][25][26][27] and carbon nanotube [28,29] have been reported to form composite membrane. However, there are still technical challenges to be met such as avoiding pinhole formation and incompatibility issues with a polymer precursor.…”

Section: Introductionmentioning

confidence: 99%

The utilization of micro-mesoporous carbon-based filler in the P84 hollow fibre membrane for gas separation

et al. 2021

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This research involved carrying out a unique micro-mesoporous carbon particle incorporation into P84 co-polyimide membrane for improved gas separation performance. The carbon filler was prepared using a hard template method from zeolite and known as zeolite-templated carbon (ZTC). This research aims to study the loading amount of ZTC into P84 co-polyimide toward the gas separation performance. The ZTC was prepared using simple impregnation method of sucrose into hard template of zeolite Y. The SEM result showing a dispersed ZTC particle on the membrane surface and cross-section. The pore size distribution (PSD) of ZTC revealed that the particle consists of two characteristics of micro and mesoporous region. It was noted that with only 0.5 wt% of ZTC addition, the permeability was boosted up from 4.68 to 7.06 and from 8.95 to 13.15 barrer, for CO 2 and H 2 respectively when compared with the neat membrane. On the other hand, the optimum loading was at 1 wt%, where the membrane received thermal stability boost of 10% along with the 62.4 and 35% of selectivity boost of CO 2 /CH 4 and H 2 /CH 4 , respectively. It was noted that the position of the filler on the membrane surface was significantly affecting the gas transport mechanism of the membrane. Overall, the results demonstrated that the addition of ZTC with proper filler position is a potential candidate to be applicable in the gas separation involving CO 2 and H 2 .

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“…Besides, many researchers have conducted meaningful research on improving the performance of nanofiltration membranes. Kang et al . synthesized a composite membrane with sandwich morphology formed by graphene oxide (GO) and oxidized carbon nanotubes (OCNT) alternately assembled on a polyacrylonitrile substrate in a way of layer‐by‐layer self‐assembly technique, which shows an excellent antifouling and stable performance.…”

Section: Introductionmentioning

confidence: 99%

The Application of Nanofiltration for Separating Aluminium and Lithium from Lepidolite Leaching Solution

Gao

Wang²,

Zhao³

et al. 2020

ChemistrySelect

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This paper concerns the feasibility of separating Al 3 + and Li + by nanofiltration, and a new method for separating and recovering lithium from lepidolite leaching solution was proposed. Factors like salinity, mass ratio of Al 3 + /Li + , operating pressure, temperature and proportion of SO 4 2À were investigated under single-stage cycle mode. Multiple linear regression was used to further study the mixed effect of pressure and temperature on separation efficiency and membrane flux. The results suggest that the combination of charge effect and steric hindrance effect plays a decisive role in the separation of lithium and aluminum. When the salinity of the feed solution is 45 g/L and the mass ratio of Al/Li is 6, a combination of higher temperature and pressure within the range that the membrane can withstand is beneficial to improve separation efficiency. And a proper amount of SO 4 2À is beneficial for the separation of aluminum and lithium. Overall, it is found that nanofiltration has a relatively good separation efficiency of lithium and aluminum and provided a novel vision for future separation from lepidolite leaching solution. Table 1. Principle of traditional aluminum removal methods. Methods Principle Alkali Al 3 + + 4OH À = AlO 2 À + 2H 2 O Acid 2Al 3 + + 3(COOH) 2 ⋅ 2H 2 O = Al 2 (C 2 O 4 ) 3 ⋅ 2H 2 O# + 6H + Extractant Selectively forming a complex with aluminum ChemistrySelect Full Papers

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Sandwich morphology and superior dye-removal performances for nanofiltration membranes self-assemblied via graphene oxide and carbon nanotubes

Cited by 100 publications

References 51 publications

General Synthesis of Ultrafine Metal Oxide/Reduced Graphene Oxide Nanocomposites for Ultrahigh-Flux Nanofiltration Membrane

General Synthesis of Ultrafine Metal Oxide/Reduced Graphene Oxide Nanocomposites for Ultrahigh-Flux Nanofiltration Membrane

The utilization of micro-mesoporous carbon-based filler in the P84 hollow fibre membrane for gas separation

The Application of Nanofiltration for Separating Aluminium and Lithium from Lepidolite Leaching Solution

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