Carbon dot cross-linked polyvinylpyrrolidone hybrid hydrogel for simultaneous dye adsorption, photodegradation and bacterial elimination from waste water

Nayak, Suman; Prasad, Surendra Rajit; Mandal, Debabrata; Das, Prolay

doi:10.1016/j.jhazmat.2020.122287

Cited by 92 publications

(45 citation statements)

References 50 publications

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“…MB is a cationic dye (unprotonated, MB + ); the positive charge on the sulfur atom can delocalize to the terminal nitrogen atoms, which can be electrostatically attracted by negatively charged functional groups. [ 23 ] The poor adsorption capacity at pH < 10 can be attributed to the competitive adsorption between the H + and MB molecules and partial protonation of –NH 2. [ 39 ] The adsorption capacity increased significantly due to –NH 2 deprotonation at pH = 10.…”

Section: Resultsmentioning

confidence: 99%

“…The results showed that the addition of CDs can significantly improve the oil absorption capacity. Nayaka and colleagues [ 23 ] reported that hydrogel materials were obtained from CDs‐crosslinked polyvinylpyrrolidone, and their adsorption dyes and photocatalytic degradation properties were studied. The results showed that the hydrogel had good adsorption and removal capability for methyl blue (MB).…”

Section: Introductionmentioning

confidence: 99%

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Carbon dots crosslinked chitosan/cellulose sponge capture of methyl blue by an adsorption process

Yuan

Zhu

et al. 2021

Luminescence

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For environmental protection, organic dyes and solvents of industrial wastewater must be eliminated. Here, a citric acid‐based carbon dots (CA‐CDs) crosslinked chitosan/microcrystalline cellulose (CS/MCC/CA‐CDs) sponge was synthesized to study its adsorption performance for methyl blue (MB) dye. The morphology of the sponge was a tangled fibre with a bundle formed by hydrogen bonds between CA‐CDs and the CS/MCC composite matrix. The abundant amount of tangled fibre bundle units can offer plentiful active adsorption sites to collect the dye molecules. The adsorption capacity of the CS/MCC/CA‐CDs sponge toward MB was 306.8 mg/g at pH 10 and a temperature of 298 K. In addition, the pseudo‐second‐order kinetic model was matched with the adsorption kinetic experimental data, and the adsorption isotherm data can be described by the Langmuir models. This study proposed that the CS/MCC/CA‐CDs sponge adsorbent creates tremendous potential application value in wastewater treatment due to its fast kinetics, high adsorption capacity, simple preparation, and eco‐friendly properties.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Carbon dots crosslinked chitosan/cellulose sponge capture of methyl blue by an adsorption process

Yuan

Zhu

et al. 2021

Luminescence

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“…Moreover, CDs have been embedded within polymeric structures, including hydrogels and polymers of different natures, ranging from chitosan [119,120] to DNA [121], cellulose [122], gelatin [123], polyurethane [124], or poly lactic-co-glycolic acid nanoparticle [125] matrices. These composites have found ample antibacterial applications (such as in water treatment [126][127][128][129] and the surface coating field [130][131][132]). In many cases, the CD-composites showed bactericidal activity upon sun light illumination [133][134][135][136].…”

Section: Cd-based Composite Materials For Antibacterial Applicationsmentioning

confidence: 99%

Carbon Dots as an Emergent Class of Antimicrobial Agents

2021

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Antimicrobial resistance is a recognized global challenge. Tools for bacterial detection can combat antimicrobial resistance by facilitating evidence-based antibiotic prescribing, thus avoiding their overprescription, which contributes to the spread of resistance. Unfortunately, traditional culture-based identification methods take at least a day, while emerging alternatives are limited by high cost and a requirement for skilled operators. Moreover, photodynamic inactivation of bacteria promoted by photosensitisers could be considered as one of the most promising strategies in the fight against multidrug resistance pathogens. In this context, carbon dots (CDs) have been identified as a promising class of photosensitiser nanomaterials for the specific detection and inactivation of different bacterial species. CDs possess exceptional and tuneable chemical and photoelectric properties that make them excellent candidates for antibacterial theranostic applications, such as great chemical stability, high water solubility, low toxicity and excellent biocompatibility. In this review, we will summarize the most recent advances on the use of CDs as antimicrobial agents, including the most commonly used methodologies for CD and CD/composites syntheses and their antibacterial properties in both in vitro and in vivo models developed in the last 3 years.

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“…This is a highly probable photophysical aspect of the CD other than fluorescence. 20 − 22 The ROS generation ability of the CD essentially requires additional measures for storage and relevant toxicity evaluation to determine its suitability for in vivo applications. Unfortunately, toxicity studies done so far applicable to CD–DNA condensates only partially account for the CDs’ concentration.…”

Section: Introductionmentioning

confidence: 99%

Covalent Conjugation of Carbon Dots with Plasmid and DNA Condensation Thereafter: Realistic Insights into the Condensate Morphology, Energetics, and Photophysics

Nayak

Das

2021

ACS Omega

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The use of carbon quantum dots (CDs) as trackable nanocarriers for plasmid and gene as hybrid DNA condensates has gained momentum, as evident from the significant recent research efforts. However, the in-depth morphology of the condensates, the energetics of the condensation process, and the photophysical aspects of the CD are not well understood and often disregarded. Herein, for the first time, we covalently attached linearized pUC19 with citric acid and cysteamine-derived CD through the reaction of the surface amine groups of CDs with the 5′-phospho-methyl imidazolide derivative of the plasmid to obtain a 1:1 CD-pUC19 covalent conjugate. The CD-pUC19 conjugates were further transformed into DNA condensates with spermine that displayed a toroidal morphology with a diameter of ∼200 nm involving ∼2–5 CD-pUC19 conjugates in a single condensate. While the interaction of pristine CD to spermine was exothermic, the binding of the CD-pUC19 conjugate with spermine was endothermic and primarily entropy-driven. The condensed plasmid displayed severe conformational stress and deviation from the B-form due to the compact packing of the DNA but better transfection ability than the pristine CD. The CDs in the condensates tend to come close to each other at the core that results in their shielding from excitation. However, this does not prevent them from emanating reactive oxygen species on visible light exposure that compromises the decondensation process and cell viability at higher exposure times, calling for utmost caution in establishing them as nonviral transfecting agents universally.

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Carbon dot cross-linked polyvinylpyrrolidone hybrid hydrogel for simultaneous dye adsorption, photodegradation and bacterial elimination from waste water

Cited by 92 publications

References 50 publications

Carbon dots crosslinked chitosan/cellulose sponge capture of methyl blue by an adsorption process

Carbon dots crosslinked chitosan/cellulose sponge capture of methyl blue by an adsorption process

Carbon Dots as an Emergent Class of Antimicrobial Agents

Covalent Conjugation of Carbon Dots with Plasmid and DNA Condensation Thereafter: Realistic Insights into the Condensate Morphology, Energetics, and Photophysics

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