Preparation of molecular selective GO/DTiO2-PDA-PEI composite nanofiltration membrane for highly pure dye separation

Xu, Yanqing; Peng, Guibin; Liao, Junbin; Shen, Jiangnan; Gao, Congjie

doi:10.1016/j.memsci.2019.117727

Cited by 62 publications

(21 citation statements)

References 75 publications

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“…The separation factor ( S ), indicating the dye/salt selectivity, was defined as the ratio of the dye rejection to that of salt. The corresponding calculation is presented in eq …”

Section: Experimental Sectionmentioning

confidence: 99%

Aramid Nanofiber Membranes Reinforced by MXene Nanosheets for Recovery of Dyes from Textile Wastewater

Dai

Zhou

et al. 2021

ACS Appl. Nano Mater.

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Efficient recovery of dyes from textile wastewaters using membrane-based technologies calls for membranes with low rejection of salts but high rejection of dyes. In this study, we intercalated the rigid 2D-ultrathin MXene (Ti3C2T x ) nanosheet into the loose framework assembled by 1D aramid nanofibers and obtained a MXene-reinforced aramid nanofiber (ANF) membrane. The optimized MXene-reinforced ANF membrane (20 wt % MXene loading) exhibited a high selectivity of dye/salt, that is, 99.1 ± 0.3% for Alcian Blue, 96.1 ± 2.4% for Congo Red, 98.6 ± 0.9% for Rose Bengal, and extremely low rejection of salts (<0.2%) at a concentration of 5 g L–1 of NaCl with separation factors of 826, 1068, and 758 for Alcian Blue, Congo Red, and Rose Bengal, respectively. Moreover, the membrane permeability could reach 195.3 ± 6.5 L m–2 h–1 bar–1. The MXene-reinforced ANF membrane demonstrated a superior separation performance to most of the other reported membranes for dye/salt fraction. Mechanistic investigation showed that the reinforced rigidity of the membrane by the intercalated MXene was the main mechanism for the enhanced permeability and selectivity of the MXene/ANF composite membrane (that is, a nanochannel of 2.34 nm was maintained for the MXene/ANF composite membrane after filtration while the nanochannel of the ANF membrane was increased from 2.27 to 2.43 nm). The results highlight that the nanofibrous membranes reinforced by rigid 2D materials are promising for an effective separation of dyes and salts in textile wastewaters.

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“…The separation factor ( S ), indicating the dye/salt selectivity, was defined as the ratio of the dye rejection to that of salt. The corresponding calculation is presented in eq …”

Section: Experimental Sectionmentioning

confidence: 99%

Aramid Nanofiber Membranes Reinforced by MXene Nanosheets for Recovery of Dyes from Textile Wastewater

Dai

Zhou

et al. 2021

ACS Appl. Nano Mater.

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“…3B). [49][50][51][52][53][54][55][56][57][58][59][60][61][62][63][64][65][66] Furthermore, glutaraldehyde 67 and 1-allyl-3-vinylimidazolium chloride 68 have also been utilized as cross-linking agents to improve the stability of the GO membrane in water. Although covalent cross-linking can endow the GO membranes with enough stability in water, the excessive cross-linking will disturb and block water transport within the GO nanochannels, leading to the decrease of the water flux of the membrane.…”

Section: Strategies For Improving the Stability Of Go Membranes In Watermentioning

confidence: 99%

“…4C). 61,64 Besides organic molecules, metal ions (Al 3+ , Fe 3+ , La 3+ , Ca 2+ , Mg 2+ , Ni 2+ , etc.) can also act as crosslinking agents to improve the stability of GO membranes in water ( Fig.…”

Section: Strategies For Improving the Stability Of Go Membranes In Watermentioning

confidence: 99%

The stability of a graphene oxide (GO) nanofiltration (NF) membrane in an aqueous environment: progress and challenges

Wang

Guo

et al. 2020

Mater. Adv.

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“…Various interesting combinations of nanostructures with different dimensions, including the coupling of 0D/2D nanostructures [ 160 , 161 , 162 , 163 , 164 , 165 , 166 , 167 , 168 , 169 ], 1D/3D nanostructures [ 170 ], 1D/2D nanostructure [ 171 , 172 , 173 ], 3D/2D nanostructures [ 174 , 175 , 176 , 177 , 178 ] have been attempted for liquid separation nanocomposite membranes. A glimpse into these works revealed the huge potential of high surface area 2D nanosheets to serve as a versatile platform for the deposition of other nanostructures while their restacking issue can be simultaneously overcome through the insertion of foreign nanostructures.…”

Section: Synergy Of Multidimensional Hybrid Nanostructuresmentioning

confidence: 99%

Nanocomposite Membranes for Liquid and Gas Separations from the Perspective of Nanostructure Dimensions

2020

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One of the critical aspects in the design of nanocomposite membrane is the selection of a well-matched pair of nanomaterials and a polymer matrix that suits their intended application. By making use of the fascinating flexibility of nanoscale materials, the functionalities of the resultant nanocomposite membranes can be tailored. The unique features demonstrated by nanomaterials are closely related to their dimensions, hence a greater attention is deserved for this critical aspect. Recognizing the impressive research efforts devoted to fine-tuning the nanocomposite membranes for a broad range of applications including gas and liquid separation, this review intends to discuss the selection criteria of nanostructured materials from the perspective of their dimensions for the production of high-performing nanocomposite membranes. Based on their dimension classifications, an overview of the characteristics of nanomaterials used for the development of nanocomposite membranes is presented. The advantages and roles of these nanomaterials in advancing the performance of the resultant nanocomposite membranes for gas and liquid separation are reviewed. By highlighting the importance of dimensions of nanomaterials that account for their intriguing structural and physical properties, the potential of these nanomaterials in the development of nanocomposite membranes can be fully harnessed.

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Preparation of molecular selective GO/DTiO2-PDA-PEI composite nanofiltration membrane for highly pure dye separation

Cited by 62 publications

References 75 publications

Aramid Nanofiber Membranes Reinforced by MXene Nanosheets for Recovery of Dyes from Textile Wastewater

Aramid Nanofiber Membranes Reinforced by MXene Nanosheets for Recovery of Dyes from Textile Wastewater

The stability of a graphene oxide (GO) nanofiltration (NF) membrane in an aqueous environment: progress and challenges

Nanocomposite Membranes for Liquid and Gas Separations from the Perspective of Nanostructure Dimensions

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