Self-sterilizing diblock polycation-enhanced polyamidoxime shape-stable blow-spun nanofibers for high-performance uranium capture from seawater

Li, Zhen; Yu, Zhiqun; Wu, Yundi; Wu, Xi; Wan, Yi; Yuan, Yihui; Wang, Ning

doi:10.1016/j.cej.2020.124648

Cited by 62 publications

(25 citation statements)

References 76 publications

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“…In addition, the U-absorption capacity of the AUPM at pH = 5 was significantly higher than that at pH = 8 (Figure b), which may be explained by the change of zeta potential on the surface of AUPM (Figure S14). At pH = 5 (the U(VI) included both negative and positive ions), the positive value of the AUPM zeta potential manifested that the surface of the AUPM carries positive charges and can attract the negative ions containing uranium to promote the U adsorption; at pH = 8 (the U(VI) included only negative ions), the negative value of AUPM zeta potential manifested that the surface of AUPM carries negative charges and can repel the negative ions containing U(VI) to decrease the U adsorption. , …”

Section: Resultsmentioning

confidence: 99%

“…Therefore, they are easy to be destroyed by a biological adhesion and cannot, with a high efficiency, extract uranium from a real aqueous environment for a long time. , In both wastewater and seawater, various kinds of bacteria/microorganisms and shellfishes can adhere to the surface of U-adsorbents, which can reduce the U-adsorbing capacity and even further destroy the adsorbents. Furthermore, in an aqueous environment, the waves, currents, and other severe conditions can also damage the adsorbents without a high-strength mechanical property. , Nowadays, although a few AO-based adsorbents with a high mechanical strength or good antibiofouling behavior have been developed, it is still a great challenge to design AO-based adsorbents coupling the two advantages.…”

Section: Introductionmentioning

confidence: 99%

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Antibiofouling Ultrathin Poly(amidoxime) Membrane for Enhanced U(VI) Recovery from Wastewater and Seawater

Sun

Liu

Wen

et al. 2021

ACS Appl. Mater. Interfaces

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Although eco-friendly amidoxime-based adsorbents own an excellent uranium (U)-adsorption capacity, their U-adsorption efficiency is commonly reduced and even damaged by the biological adhesion from bacteria/microorganisms in an aqueous environment. Herein, we present an antibiofouling ultrathin poly(amidoxime) membrane (AUPM) with highly enhanced U-adsorption performance, through dispersing the quaternized chitosan (Q-CS) and poly(amidoxime) in a cross-linked sulfonated cellulose nanocrystals (S-CNC) network. The cross-linked S-CNC not only can elevate the hydrophilicity to improve the U-adsorption efficiency of AUPM but also can enhance the mechanical strength to form a self-supporting ultrathin membrane (17.21 MPa, 10 μm thickness). More importantly, this AUPM owns a good antibiofouling property, owing to the broad-spectrum antibacterial quaternary ammonium groups of the Q-CS. As a result, within the 1.00 L of low-concentration (100 ppb) U-added pure water (pH ≈ 5) and seawater (pH ≈ 8) for 48 h, 30 mg of AUPM can recover 93.7% U and 91.4% U, respectively. Furthermore, compared with the U-absorption capacity of a blank membrane without the Q-CS, that of AUPM can significantly increase 37.4% reaching from 6.39 to 8.78 mg/g after being in natural seawater for only 25 d. Additionally, this AUPM can still maintain almost constant tensile strength during 10 cycles of adsorption–desorption, which indicates the relatively long-term usability of AUPM. This AUPM will be a promising candidate for highly efficient and large-scale U-recovery from both U-containing waste freshwater/seawater and natural seawater, which will be greatly helpful to deal with the U-pollution and enrich U for the consumption of nuclear power. More importantly, the work will provide a new convenient but universal strategy to fabricate new highly enhanced low-cost U-adsorbents, through the introduction of both an antibacterial property and a high mechanical performance, which will be a good reference for the design of new highly efficient U-adsorbents.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Antibiofouling Ultrathin Poly(amidoxime) Membrane for Enhanced U(VI) Recovery from Wastewater and Seawater

Sun

Liu

Wen

et al. 2021

ACS Appl. Mater. Interfaces

Self Cite

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“…Membrane integrity of MRSA and P. aeruginosa was investigated in accordance with the literature. , Bacteria in logarithmic phase were collected via centrifugation (4000 rpm, 5 min), washed three times with PBS (0.01 M, pH7.4), resuspended, and diluted to a concentration of 2 × 10 8 CFU/mL with PBS. The bacterial suspension (200 μL) was mixed with P1 (2 × MIC, 4 × MIC, 8 × MIC, 200 μL) to achieve a final bacterial inoculum of 1 × 10 8 CFU/mL and final P1 concentrations of 1 × MIC, 2 × MIC, 4 × MIC, respectively.…”

Section: Methodsmentioning

confidence: 99%

“…The PI fluorescence was monitored at specified time intervals (10 min for MRSA and 20 min for P. aeruginosa) for 1 h using a microplate reader (Infinite M200 Pro, TECAN, Switzerland) with an excitation wavelength of 535 nm and an emission wavelength of 617 nm. Subsequently, different ZnPc- 40,46 Bacteria in logarithmic phase were collected via centrifugation (4000 rpm, 5 min), washed three times with PBS (0.01 M, pH7.4), resuspended, and diluted to a concentration of 2 × 10 8 CFU/mL with PBS. The bacterial suspension (200 μL) was mixed with P1 (2 × MIC, 4 × MIC, 8 × MIC, 200 μL) to achieve a final bacterial inoculum of 1 × 10 8 CFU/mL and final P1 concentrations of 1 × MIC, 2 × MIC, 4 × MIC, respectively.…”

Section: ■ Methodsmentioning

confidence: 99%

Poly(l-ornithine)-Grafted Zinc Phthalocyanines as Dual-Functional Antimicrobial Agents with Intrinsic Membrane Damage and Photothermal Ablation Capacity

et al. 2021

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Multifunctional antimicrobial peptides that combine the intrinsic microbicidal property of cationic polypeptide chains and additional antibacterial strategy hold promising applications for the treatment of infections caused by antibiotic-resistant bacteria, especially "superbugs". In the present study, star-shaped copolymers ZnPc-g-PLO with a zinc phthalocyanine (ZnPc) core and four poly(L-ornithine) (PLO) arms were designed, synthesized, and evaluated as dualfunctional antimicrobial agents, that is, intrinsic membrane damage and photothermal ablation capacity. In an aqueous solution, amphiphilic ZnPc-g-PLO molecules self-assemble into nanosized polymeric micelles with an aggregated ZnPc core and star-shaped PLO periphery, where the ZnPc core exhibits appreciable aggregation-induced photothermal conversion efficiency. In the absence of laser irradiation, ZnPc-g-PLO micelles display potent and broad-spectrum antibacterial activities via physical bacterial membrane disruption as a result of the high cationic charge density of the star-shaped PLO. Upon laser irradiation, significant improvement in bactericidal potency was realized due to the efficacious photothermal sterilization from the ZnPc core. Notably, ZnPc-g-PLO micelles did not induce drug-resistance upon subinhibitory passages. In summary, dualfunctional ZnPc-g-PLO copolymers can serve as promising antibacterial agents for the treatment of infectious diseases caused by antibiotic-resistant bacteria.

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“…The mechanism of the antibacterial activities by electrostatic attraction is very difficult to overcome for bacteria unless they change the structural properties of their cell membranes in long-term evolutionary processes. It is also worth noting that guanidines are highly soluble in water, enabling them having a very high acid dissociation constant in water, indicating that guanidine derivatives are better suited for stable electrostatic interaction with the anionic surface of microbes [ 106 , 107 ]. In summary, the guanidine-based polymers are superior to quaternary ammonium groups and have great application potential in antibacterial modification of membrane surfaces.…”

Section: Prevention and Control Of Membrane Biofoulingmentioning

confidence: 99%

Advancing Strategies of Biofouling Control in Water-Treated Polymeric Membranes

et al. 2022

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Polymeric membranes, such as polyamide thin film composite membranes, have gained increasing popularity in wastewater treatment, seawater desalination, as well as the purification and concentration of chemicals for their high salt-rejection and water flux properties. Membrane biofouling originates from the attachment or deposition of organic macromolecules/microorganisms and leads to an increased operating pressure and shortened service life and has greatly limited the application of polymeric membranes. Over the past few years, numerous strategies and materials were developed with the aim to control membrane biofouling. In this review, the formation process, influence factors, and consequences of membrane biofouling are systematically summarized. Additionally, the specific strategies for mitigating membrane biofouling including anchoring of hydrophilic monomers, the incorporation of inorganic antimicrobial nanoparticles, coating/grafting of cationic bactericidal polymers, and the design of multifunctional material integrated multiple anti-biofouling mechanisms, are highlighted. Finally, perspectives on the challenges and opportunities in anti-biofouling polymeric membranes are shared, shedding light on the development of even better anti-biofouling materials in near future.

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Self-sterilizing diblock polycation-enhanced polyamidoxime shape-stable blow-spun nanofibers for high-performance uranium capture from seawater

Cited by 62 publications

References 76 publications

Antibiofouling Ultrathin Poly(amidoxime) Membrane for Enhanced U(VI) Recovery from Wastewater and Seawater

Antibiofouling Ultrathin Poly(amidoxime) Membrane for Enhanced U(VI) Recovery from Wastewater and Seawater

Poly(l-ornithine)-Grafted Zinc Phthalocyanines as Dual-Functional Antimicrobial Agents with Intrinsic Membrane Damage and Photothermal Ablation Capacity

Advancing Strategies of Biofouling Control in Water-Treated Polymeric Membranes

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