Thin-film nanocomposite nanofiltration membrane with enhanced desalination and antifouling performance via incorporating L-aspartic acid functionalized graphene quantum dots

Wu, Chenpu; Xie, Quanling; Hong, Zhuan; Shen, Lufang; Yu, Tong; Guo, Honghui; Xiong, Ying; Zhang, Guoliang; Lu, Yinghua; Shao, Wenyao

doi:10.1016/j.desal.2020.114811

Cited by 63 publications

(18 citation statements)

References 44 publications

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“…The AGQDs synthesized by the bottom–up method have a dot-like structure with 4–9 nm ( Figure 1 ). The comprehensive characterizations of AGQDs have been reported in our previous study [ 21 ]. The optical response of GQDs and AGQDs can be evaluated by UV-Vis diffuse reflectance spectroscopy.…”

Section: Resultsmentioning

confidence: 99%

“…It is found that the PES substrate contains a N element from its XPS spectra, which probably derives from the residual pore former such as polyvinylpyrrolidone containing a N element. In addition, according to Table 2 , the M3/AGQDs-0.2 membrane has the highest N content, which is attributed to the abundant N element from PEI and AGQDs [ 21 ]. The introduction of AGQDs might improve the degree of cross-linking between PDA and PEI during the co-deposition process, as deduced by the following mechanism analysis between PEI and PDA.…”

Section: Resultsmentioning

confidence: 99%

“…As shown in Figure 1 , AGQDs were synthesized by a one-step hydrothermal method [ 21 ]. Briefly, 10 g of CA and a certain amount of L-aspartic acid were mixed into 50 mL of deionized water.…”

Section: Methodsmentioning

confidence: 99%

“…The comprehensive characterizations of AGQDs by various methods, including Fourier transform infrared spectroscopy (FT-IR), transmission electron microscopy (TEM), atomic force microscopy (AFM), X-ray photoelectron spectroscopy (XPS), zeta potential, and X-ray diffraction (XRD) were based on our previous work [ 21 ]. The UV-Vis spectrophotometer (PerkinElmer Lambda 750 S, Massachusetts, USA) was used to obtain the UV-Vis absorption spectra of GQDs and AGQDs.…”

Section: Methodsmentioning

confidence: 99%

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A Facile Co-Deposition Approach to Construct Functionalized Graphene Quantum Dots Self-Cleaning Nanofiltration Membranes

Chen

et al. 2021

Nanomaterials

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In this study, a novel photocatalytic self-cleaning nanofiltration (NF) membrane was fabricated by constructing aspartic acid-functionalized graphene quantum dots (AGQDs) into the polydopamine/polyethyleneimine (PDA/PEI) selective layer via the co-deposition method. The chemical composition, microstructure, and hydrophilicity of the prepared membranes were characterized by scanning electron microscopy (SEM), atomic force microscopy (AFM), attenuated total reflection (ATR-FTIR), X-ray photoelectron spectroscopy (XPS), and water contact angle (WCA). Meanwhile, the effects of PEI molecular weight and AGQDs concentration on NF membrane structures and separation performance were systematically investigated. The photocatalytic self-cleaning performance of the PDA/PEI/AGQDs membrane was evaluated in terms of flux recovery rate. For constructing high-performance NF membranes, it is found that the optimal molecular weight of PEI is 10,000 Da, and the optimal concentration of AGQDs is 2000 ppm. The introduction of hydrophilic AGQDs formed a more hydrophilic and dense selective layer during the co-deposition process. Compared with the PDA/PEI membrane, the engineered PDA/PEI/AGQDs NF membrane has enhanced water flux (55.5 LMH·bar−1) and higher rejection (99.7 ± 0.3% for MB). In addition, the PDA/PEI/AGQDs membrane exhibits better photocatalytic self-cleaning performance over the PDA/PEI membrane (83% vs. 69%). Therefore, this study provides a facile approach to construct a self-cleaning NF membrane.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

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A Facile Co-Deposition Approach to Construct Functionalized Graphene Quantum Dots Self-Cleaning Nanofiltration Membranes

Chen

et al. 2021

Nanomaterials

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“…In addition, it has excellent hydrophilicity, non‐toxicity and low cost. L‐Asp functionalized CDs (ACDs) were synthesized by hydrothermal treatment of citric acid and Wu et al [49] . incorporated them into the polyamide layer of the membrane through IP (Figure 12).…”

Section: Application Of Cds@membranesmentioning

confidence: 99%

Advances in Integrating Carbon Dots With Membranes and Their Applications

Yan

et al. 2021

ChemistrySelect

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Carbon dots (CDs) attract interests from researchers in the field of membranes owing to their ultra‐small size, non‐toxic, highly hydrophilic, abundant surface functional groups, stable photoluminescence, fast proton conductivity and excellent light capture capability. The integration of membranes with CDs (CDs@membranes) can enhance the overall performance of membranes significantly and CDs@membranes relies on three approaches: doping, grafting and layer‐by‐layer (LbL) self‐assembly. This paper reviews the research progress of CDs@membranes in the past five years, introduces the mechanism of CDs to improve membrane performance and the methods for preparing CDs@membranes, categorizes them into water treatment, sensing, electrochemistry, light processing and other fields for review, and finally discusses the current challenges and outlook the future direction.

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Determination of catechin and glutathione using copper aspartate nanofibers with multiple enzyme-like activities

et al. 2022

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Thin-film nanocomposite nanofiltration membrane with enhanced desalination and antifouling performance via incorporating L-aspartic acid functionalized graphene quantum dots

Cited by 63 publications

References 44 publications

A Facile Co-Deposition Approach to Construct Functionalized Graphene Quantum Dots Self-Cleaning Nanofiltration Membranes

A Facile Co-Deposition Approach to Construct Functionalized Graphene Quantum Dots Self-Cleaning Nanofiltration Membranes

Advances in Integrating Carbon Dots With Membranes and Their Applications

Determination of catechin and glutathione using copper aspartate nanofibers with multiple enzyme-like activities

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