A novel gravity-driven nanofibrous membrane for point-of-use water disinfection: polydopamine-induced in situ silver incorporation

Wang, Jianqiang; Wu, Yichao; Yang, Zhe; Guo, Hao; Cao, Bin; Tang, Chuyang Y.

doi:10.1038/s41598-017-02452-2

Cited by 42 publications

(20 citation statements)

References 43 publications

(50 reference statements)

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“…On-site ozone generators rely on standard voltage inputs (110 or 220 V), which are also hardly accessible after calamity or in underdeveloped areas 11 . POU disinfection techniques assisted by new materials arise quickly, including photocatalytic process [12][13][14] , locally enhanced electric field treatment (LEEFT) 15,16 , and filtration [17][18][19][20][21] . These techniques conquer some limitations of the previous methods (e.g., complex equipment, the formation of by-products, and/or demand of chemicals), but also suffer from different drawbacks, including long treatment time, short product lifespan, and/or fouling problems.…”

Section: Introductionmentioning

confidence: 99%

Smartphone-powered efficient water disinfection at the point of use

et al. 2020

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Clean water free of bacteria is a precious resource in areas where no centralized water facilities are available. Conventional chlorine disinfection is limited by chemical transportation, storage, and the production of carcinogenic by-products. Here, a smartphone-powered disinfection system is developed for point-of-use (POU) bacterial inactivation. The integrated system uses the smartphone battery as a power source, and a customized on-the-go (OTG) hardware connected to the phone to realize the desired electrical output. Through a downloadable mobile application, the electrical output, either constant current (20–1000 µA) or voltage (0.7–2.1 V), can be configured easily through a user-friendly graphical interface on the screen. The disinfection device, a coaxial-electrode copper ionization cell (CECIC), inactivates bacteria by low levels of electrochemically generated copper with low energy consumption. The strategy of constant current control is applied in this study to solve the problem of uncontrollable copper release by previous constant voltage control. With the current control, a high inactivation efficiency of E. coli (~6 logs) is achieved with a low level of effluent Cu (~200 µg L−1) in the water samples within a range of salt concentration (0.2–1 mmol L−1). The smartphone-based power workstation provides a versatile and accurate electrical output with a simple graphical user interface. The disinfection device is robust, highly efficient, and does not require complex equipment. As smartphones are pervasive in modern life, the smartphone-powered CECIC system could provide an alternative decentralized water disinfection approach like rural areas and outdoor activities.

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Section: Introductionmentioning

confidence: 99%

Smartphone-powered efficient water disinfection at the point of use

et al. 2020

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“…New technologies are in constant demand for the reduction and better complete removal of these harmful contaminants, in order to ensure the safe use of drinking water and significantly reduce the environment risk of water-borne diseases [2]. In recent years, membrane technologies have been favored over other traditional drinking water treatment technologies for removal of bacteria from drinking water effluents, such as disinfection, distillation, or media filtration, due to the advantages offered, such as high stability, high efficiency, low cost, low pollution, flexible equipment design, and small footprint [3,4,5,6].…”

Section: Introductionmentioning

confidence: 99%

Ceramic-Based Composite Membrane with a Porous Network Surface Featuring a Highly Stable Flux for Drinking Water Purification

Zhu

Rakesh

et al. 2019

Membranes

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Highly efficient drinking water purification is still an important challenge for membrane techniques where high flux, high rejection, and low fouling are highly emphasized. In the present work, a porous network surface with carbon nanotubes (CNTs) was in situ constructed on hierarchically-structured mullite ceramic membranes. Interestingly, such a composite structure was demonstrated to effectively remove bacteria from drinking water with a highly stable long-term flux. After membrane structure characterizations, separation performance, such as flux and rejection, was assessed by the purification of bacteria-contaminated drinking water. The results confirmed that the mullite-CNT composite membrane claimed a complete removal of two model bacteria (100% rejection of Escherichia coli (E. coli) and Staphylococcus aureus (S. aureus)), driven by a trans-membrane pressure of 0.1 MPa, where a surface sieving mechanism was dominant. A highly stable long-term flux for the 24 h filtration process was achieved, which can be attributed to the porous membrane surface with a special randomly-oriented CNTs network structure, featuring very high three-dimensional open porosity, allowing water to rapidly transport. The bacteria were only trapped on the CNTs network surface via surface filtration, without pore plugging, endowing the mullite-CNT membrane with unprecedentedly low fouling propensity to keep high flux with long-term operation time.

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“…The incorporation of inorganic nanoparticles (e.g., silver) or chlorine-releasing precursors in polymeric substrates/materials that are typically found in water disinfection devices are some of the most widely reported methods for inactivating bacteria in the water supply 11 – 14 . These materials generally exhibit moderate to good antibacterial activity.…”

Section: Introductionmentioning

confidence: 99%

Highly Bactericidal Macroporous Antimicrobial Polymeric Gel for Point-of-Use Water Disinfection

Kumar

Boyer

Nebhani

et al. 2018

Sci Rep

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Access to clean and safe water supply remains inadequate in many developing countries. One of the key challenges is to remove pathogenic bacteria from the water supply via effective water disinfection technologies to prevent the spread of diseases and to ensure the safety of consumers. Herein, a highly effective point-of-use (on-demand) water disinfection technology, in the form of a polymeric scaffold called macroporous antimicrobial polymeric gel (MAPG), is demonstrated. MAPG is easy to fabricate, completely organic and possess inherent antimicrobial property which makes it non-reliant on inorganic compounds such as silver where the long-term toxicity remains unknown. MAPG is highly bactericidal and can disinfect bacteria-contaminated water (ca. 108 CFU mL−1) at a capacity of about >50 times the mass of the organic material used, inactivating >99% of both Gram-negative and Gram-positive bacteria including Escherichia coli, Vibrio cholerae and Staphylococcus aureus within 20 minutes of treatment. When fabricated in a syringe, MAPG eliminates E. coli from contaminated water source by >8.0 log10 reduction in bacteria counts (i.e., no viable bacteria were detected after treatment), and the syringe can be reused multiple times without losing potency. The MAPG technology is not only restricted to water disinfection but may also be applicable in other bacteria inactivation applications.

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A novel gravity-driven nanofibrous membrane for point-of-use water disinfection: polydopamine-induced in situ silver incorporation

Cited by 42 publications

References 43 publications

Smartphone-powered efficient water disinfection at the point of use

Smartphone-powered efficient water disinfection at the point of use

Ceramic-Based Composite Membrane with a Porous Network Surface Featuring a Highly Stable Flux for Drinking Water Purification

Highly Bactericidal Macroporous Antimicrobial Polymeric Gel for Point-of-Use Water Disinfection

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