Na+ functionalized carbon quantum dot incorporated thin-film nanocomposite membranes for selenium and arsenic removal

He, Yingran; Zhao, Die Ling; Chung, Tai‐Shung

doi:10.1016/j.memsci.2018.07.031

Cited by 90 publications

(46 citation statements)

References 52 publications

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“…By increasing the NC‐LAP concentration, the water permeability of TFN membranes is gradually raised to 2.7 and 2.74 LMH bar −1 for NC‐LAP loadings of 0.3 and 0.4 wt%, respectively, due to the enhanced hydrophilicity of polyamide layers. [ 35 ] Since the polyamide layers also become thicker with more NC‐LAP loadings, the benefit of the enhanced hydrophilicity from NC‐LAP may surpass the negative effect of higher transport resistance due to the thicker polyamide layer on water transport. [ 47 ]…”

Section: Resultsmentioning

confidence: 99%

“…Thin‐film nanocomposite (TFN) membranes, a new type of nanotechnology‐enhanced membranes, are studied as a promising candidate for desalination purposes. [ 5,6,20–22 ] Many nanoparticles, such as zeolites, [ 6,23–25 ] silica, [ 26,27 ] metal‐organic frameworks−covalent‐organic frameworks (MOFs−COFs), [ 28–30 ] carbon nanotubes, [ 31,32 ] and carbon−graphene oxide quantum dots, [ 33–35 ] have been incorporated into the polyamide matrix of TFN membranes to increase membrane hydrophilicity and provide additional water pathways. [ 36 ] Nevertheless, most of the nanoparticles used are produced in laboratory scale and the yield is relatively low, which is difficult to scale up for commercialization when taking economic viability into account.…”

Section: Introductionmentioning

confidence: 99%

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Nanoclays‐Incorporated Thin‐Film Nanocomposite Membranes for Reverse Osmosis Desalination

Zhao

Chung

2020

Adv Materials Inter

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produce a TFC membrane with both high water permeability and salt rejection as there is a trade-off relationship between them. [5,6,[11][12][13] Up to now, various methods, such as monomer alteration, [14][15][16] surface modification, [17,18] and posttreatment, [19] have been attempted to improve the membrane performance.The rapid progress in nanomaterials has brought new possibilities to break through the bottleneck. Thin-film nanocomposite (TFN) membranes, a new type of nanotechnology-enhanced membranes, are studied as a promising candidate for desalination purposes. [5,6,[20][21][22] Many nanoparticles, such as zeolites, [6,[23][24][25] silica, [26,27] metal-organic frameworks− covalent-organic frameworks (MOFs− COFs), [28][29][30] carbon nanotubes, [31,32] and carbon−graphene oxide quantum dots, [33][34][35] have been incorporated into the polyamide matrix of TFN membranes to increase membrane hydrophilicity and provide additional water pathways. [36] Nevertheless, most of the nanoparticles used are produced in laboratory scale and the yield is relatively low, which is difficult to scale up for commercialization when taking economic viability into account.Of the nanomaterials available in the market, nanoclays of abundant sources from nature are potential to be the nanofillers in TFN membranes. [37] Ghanbari et al. incorporated halloysite nanotubes into polyamide layers for brackish water desalination. [38] Dong et al. used montmorillonite as nanofillers to enhance fouling resistance. [39] Hebbar et al. utilized functionalized bentonite to improve nanofiltration performance in removal of heavy metals and humic acids. [40] However, most of the nanoclays reported have relatively low dispersity in solvents, which have to undergo long-time activation or complicated surface modifications prior to be dispersed in water or organic solvents. [38][39][40] Laponite (Na +0.7 [Si 8 Mg 5.5 Li 0.3 O 20 (OH) 4 ] 0.7− ) nanoclays (NC-LAP), a type of synthetic nanoclays, have been discovered and commercialized for decades, and commonly used as a film-forming agent, emulsifier, and gelling agent. [41,42] Owing to its excellent aqueous dispersity, small size and nontoxicity, Laponite can be a good candidate as nanofillers in TFN membranes, which requires no complicated pretreatment when being blended with the aqueous monomer solution for interfacial polymerization.Herein, new TFN membranes with incorporation of commercialized Laponite nanoclays were fabricated via conventional interfacial polymerization (illustrated in Figure 1). The influence of nanoclays on membrane morphology and separation A series of thin-film nanocomposite (TFN) membranes with incorporation of Laponite nanoclays (NC-LAP) is prepared and demonstrated for brackish water and seawater desalination. It is the first attempt to use poly(ethylene glycol) 200 (PEG200) assisted Laponite as nanofillers to improve the performance of TFN membranes for reverse osmosis (RO) seawater desalination. The influence of NC-LAP loading and PEG200 as the dispersant on membrane ...

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Nanoclays‐Incorporated Thin‐Film Nanocomposite Membranes for Reverse Osmosis Desalination

Zhao

Chung

2020

Adv Materials Inter

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“…Traditional asymmetric structure could be determined from b‐1, b‐2, and b‐3 in which the finger‐like structures would give the chosen support membrane the potential for developing high performance TFN membranes. After establishing a dense PA active layer onto the PES support, typical “nodule‐like” PA structure appeared accompanied with the increasing of surface roughness (Table ) due to the reaction between PIP and TMC and the incorporation of PHF . Comparing a‐1 with a‐2, much thicker PA active layer was formed in TFNPHF membrane due to the presence of PHF, which could form an extra PHF‐TMC layer.…”

Section: Resultsmentioning

confidence: 99%

“…After PHF particles was introduced into the PA active layer, R a and R ms values decreased firstly with the increase of the PHF dosage. These phenomena could be explained as the improvement of surface hydrophilicity, which induced the reducing of surface roughness . In one aspect, the incorporation of PHF particle with abundant of “hydroxyl,” which could directly reduce membrane surface roughness.…”

Section: Resultsmentioning

confidence: 99%

Novel thin‐film nanocomposite membrane with water‐soluble polyhydroxylated fullerene for the separation of Mg²⁺/Li⁺ aqueous solution

Shen

et al. 2019

J of Applied Polymer Sci

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Despite the prosperity of membrane technology, the separation efficiency for Mg 2+ /Li + mixture is still far from satisfactory. Herein, a novel thin-film nanocomposite (TFN) membrane was developed by loading polyhydroxylated fullerene (PHF) via interfacial polymerization. The effects of the PHF dosages on the as-developed membranes were investigated comprehensively by XPS, SEM, AFM, contact angle measurements, as well as nanofiltration tests. The results revealed the TFN membrane containing 0.01% (w/v) PHF exhibited the optimum performances. The membrane showed a pure water flux of 6.7 LÁm −2 Áh −1 Ábar −1 and salt rejections with the order of Na 2 SO 4 (95.6%) > MgSO 4 (93.6%) > MgCl 2 (89.9%) > NaCl (22.6%) > LiCl (16.3%). The membrane not only presented a separation factor of 13.1 in separating Mg 2+ /Li + mixtures, but also demonstrated excellent antifouling ability, which enables membrane regeneration without operation break, suggesting its great potentials in the recovery of Li + from brine or seawater.

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“…They inherit the unique properties of monolayer sp 2 carbon atoms structure and quantum effects of 0D nanostructure. Besides exhibiting attractive composition-related properties that fit membrane application well, the nanoscale size and homogeneity of carbon-based quantum dots also ensure their good dispersibility in polar solvents and polymer matrix [ 52 , 53 , 54 ].…”

Section: Dimension Plays Its Role: An Overviewmentioning

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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Na+ functionalized carbon quantum dot incorporated thin-film nanocomposite membranes for selenium and arsenic removal

Cited by 90 publications

References 52 publications

Nanoclays‐Incorporated Thin‐Film Nanocomposite Membranes for Reverse Osmosis Desalination

Nanoclays‐Incorporated Thin‐Film Nanocomposite Membranes for Reverse Osmosis Desalination

Novel thin‐film nanocomposite membrane with water‐soluble polyhydroxylated fullerene for the separation of Mg²⁺/Li⁺ aqueous solution

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

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Na+ functionalized carbon quantum dot incorporated thin-film nanocomposite membranes for selenium and arsenic removal

Cited by 90 publications

References 52 publications

Nanoclays‐Incorporated Thin‐Film Nanocomposite Membranes for Reverse Osmosis Desalination

Nanoclays‐Incorporated Thin‐Film Nanocomposite Membranes for Reverse Osmosis Desalination

Novel thin‐film nanocomposite membrane with water‐soluble polyhydroxylated fullerene for the separation of Mg2+/Li+ aqueous solution

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

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Novel thin‐film nanocomposite membrane with water‐soluble polyhydroxylated fullerene for the separation of Mg²⁺/Li⁺ aqueous solution