01853nas a2200229 4500008004100000022001400041245010500055210006900160260000800229300001200237490000700249520105300256653001601309653003501325653002901360653002001389653002201409100002501431700002201456700002101478856012401499 2018 eng d a1066-785700aSynthesis of ecofriendly fluorescent carbon dots and their biomedical and environmental applications0 aSynthesis of ecofriendly fluorescent carbon dots and their biome cJAN a672-6800 v333 a

Green Synthesis of nanoparticles is an emerging field with enormous advantages over conventional synthesis methods. Herein we have reported a green method for the preparation of water soluble polydisperse carbon dots (c-dots) from Cocos nucifera frond pinnae by a modified version of the `single step hydrothermal carbonization'. C-dots having blue emission were obtained with this method and we further evaluated the effect of metal ions interactions on c-dots, as a sharp decrease in photoluminescence was observed. The synthesized c-dots were found bioactive against B.subtilis, M. smegmatis and S. aureus as determined by the well diffusion assay. We also explored nanotheranostic applications of c-dots as biosensor matrix in DNA hybridization sensor for pancreatic cancer and in bioimaging of cancer cells. This study demonstrated that c-dots can be explored for numerous biomedical and environmental applications in a variety of fields owing to the cost effective synthesis, biocompatibility and excellent physico-chemical properties.

10aCarbon dots10adifferential pulse voltammetry10aDNA hybridization sensor10agreen synthesis10aPancreatic Cancer1 aJoshi, Preeti, Nigam1 aMathias, Anjelica1 aMishra, Abhishek uhttps://library.ncl.res.in/content/synthesis-ecofriendly-fluorescent-carbon-dots-and-their-biomedical-and-environmental05420nas a2200217 4500008004100000022001400041245011600055210006900171260000800240300001000248490000800258520464600266653001604912653002204928653002904950653003604979100001905015700001805034700002205052856012805074 2021 eng d a0008-622300aAutophagy and unique aerial oxygen harvesting properties exhibited by highly photocatalytic carbon quantum dots0 aAutophagy and unique aerial oxygen harvesting properties exhibit cAUG a16-270 v1813 a

Plastic pollution is a serious threat to the environment as they are not bio-degradable. Herein using waste-polyethylene, we report two inter-related important findings. First that they can be converted economically and completely into highly photocatalytic carbon quantum-dots (CQDs) using H2O2 as a residue-free oxidant in an acid medium, and they have the ability to enrich a reaction medium with an extraordinary amount of molecular oxygen harvested from the air so that no separate oxygen source is needed while carrying out facile photocatalytic oxidation reactions. Second, when they are not performing any photocatalytic reaction, they exhibit self-sensitized photo-oxidation to convert themselves completely to CO2 in the presence of sunlight, a phenomenon that we term as ‘CQD-autophagy’ by drawing parallels to the death of useless-cells in the body. Such extinction from the reaction media is unique as no other material is known to do so and advantageous because the removal of carbon-dots from a solution is rather inefficient from an industry-viewpoint due to their high solubility. Instead, the inexpensive CQDs can be discarded casually with the notion that they will gradually get eliminated from the environment.

10aCarbon dots10aOxygen-enrichment10aPhotocatalytic oxidation10aSelf-sensitized photo-oxidation1 aMondal, Sanjit1 aVinod, C., P.1 aGautam, Ujjal, K. uhttps://library.ncl.res.in/content/autophagy-and-unique-aerial-oxygen-harvesting-properties-exhibited-highly-photocatalytic01957nas a2200241 4500008004100000022001400041245011400055210006900169260000800238490000800246520113000254653001601384653003001400653002801430653001901458653001701477100001801494700001701512700002301529700001901552700001801571856012601589 2024 eng d a0254-058400aFacile microwave synthesis of Zinc Ferrite@NCDs for photocatalytic degradation of fluoroquinolone antibiotics0 aFacile microwave synthesis of Zinc FerriteNCDs for photocatalyti cFEB0 v3143 a

Zinc ferrite (ZnFe2O4) composites have attracted growing interest in photocatalytic water purification. Herein, the hybrids of zinc ferrite and nitrogen-doped carbon dots (ZnF@x%NCDs) were synthesized via facile micro-wave synthesis. X-ray diffraction and Raman characterization confirm the formation of the spinel structure, and elemental composition has been analyzed by X-ray photoelectron spectroscopy. The photocatalytic activity of ZnF@x%NCDs was evaluated via the decomposition of ciprofloxacin and norfloxacin under visible light illumination. We noted that 20 % weight loading of NCDs led to the highest (similar to 79.2 %) ciprofloxacin (CIP) degradation. Diffuse reflectance measurements demonstrate the reduction of the band gap in composites ZnF@20%NCDs (1.91 eV) compared with bare ZnF (2.03 eV); moreover, the hybridization of zinc ferrites with NCDs results in enhanced photocurrent density and surface area. The effect of experimental parameters, including the role of photocatalyst dosage, pH value, and initial concentration of pollutants on the degradation of CIP, have also been investigated.

10aCarbon dots10aCiprofloxacin degradation10aNorfloxacin degradation10aPhotocatalysis10aZinc Ferrite1 aKaushal, Neha1 aSarraf, Sonu1 aBasu, Aviru, Kumar1 aMishra, Sunita1 aSaha, Avishek uhttps://library.ncl.res.in/content/facile-microwave-synthesis-zinc-ferritencds-photocatalytic-degradation-fluoroquinolone