Carbon quantum dots anchored TiO2 nanofibers: Effective photocatalyst for waste water treatment

Saud, Prem Singh; Pant, Bishweshwar; Alam, Al-Mahmnur; Ghouri, Zafar Khan; Park, Soo‐Jin; Kim, Hee Young

doi:10.1016/j.ceramint.2015.06.007

Cited by 169 publications

(44 citation statements)

References 35 publications

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“…The need to analyze carbon dots for their characteristic attributes is very essential. These can be done by determining the particle sizes and morphological patterns using high resolution devices [34]. The atomic force microscopy (AFM), high resolution transmission electron microscopy (HrTEM), and field emission scanning emission microscopic (FESEM) techniques have been utilized for this purposes.…”

Section: Characterization and Properties Of Carbon Dotsmentioning

confidence: 99%

Sustainable Synthesis Processes for Carbon Dots through Response Surface Methodology and Artificial Neural Network

et al. 2019

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Nowadays, to ensure sustainability of smart materials, it is imperative to eliminate or reduce carbon footprint related to nano material production. The concept of design of experiment to provide an optimal synthesis process, with a desired yield, is indispensable. It is the researcher’s goal to get optimum value for experiments that requires multiple runs and multiple inputs. Herein, is a reliable approach of utilizing design of experiment (DOE) for response surface methodology (RSM). Thus, to optimize a facile and effective synthesis process for fluorescent carbon dots (CDs) derived from tapioca that is in line with green chemistry principles for sustainable synthesis. The predictions for fluorescent CDs synthesis from RSM were in excellent agreement with the artificial neural network (ANN) model prediction by the Levenberg–Marquardt back propagation (LMBP) algorithm. Considering R2, root mean square error (RMSE) and mean absolute error (MAE) have all revealed a positive hidden layer size. The best hidden layer of neurons were discovered at point 4-8, to confirm the validity of carbon dots, characterization of surface morphology and particles sizes of CDs were conducted with favorable confirmations of the unique characteristics and attributes of synthesized CDs by hydrothermal route.

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Section: Characterization and Properties Of Carbon Dotsmentioning

confidence: 99%

Sustainable Synthesis Processes for Carbon Dots through Response Surface Methodology and Artificial Neural Network

et al. 2019

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“…CDs also possess special mellifluous traits such as photoluminescence, low toxicity, water solubility, high chemical stability, easy functionalization, and impressive biocompatibility . These properties have been used extensively in various fields such as electrochemistry, wastewater treatment, photocatalysis, bio‐imaging, light emitting devices, sensing, etc.…”

Section: Introductionmentioning

confidence: 99%

A facile synthesis of nontoxic luminescent carbon dots for detection of chromium and iron in real water sample and bio‐imaging

et al. 2019

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In this study, we have reported the synthesis of luminescent carbon dots (CDs) from indigenous potato sources by simple heating reactions. The as‐synthesized CDs exhibited an average size of ~ 5.97 nm with a quantum yield (QY) of 6.08%. Furthermore, the CDs possessed high water‐solubility, possibly due to the presence of ─COOH and ─OH groups on their surfaces. The quenching of luminescence of the CDs specifically by Cr6+ and Fe3+ ions was used to detect chromium and iron in the water sample. The minimum limit of detection (LOD) for Cr6+ and Fe3+ ions was found to be 0.012 μM and 0.000549 μM, respectively, in a linear range of 0.5 μM‐100 μM and 0.5 μM‐5 μM for Cr6+ and Fe3+, respectively, which was well below the concentration specified by WHO. We used our sensing system to detect the metal ions in water from the Brahmaputra River as well as in tannery water. In addition, the MTT‐based cell viability experiments showed that the CDs were nontoxic within 200 μg/mL. High quantum yield and the easy uptake of CDs enabled the quick labelling of cytoplasm of the HeLa cells, which can be further attributed to bioimaging applications.

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“…Most studies in the field of photocatalysis are focusedo nt he synthesis,c haracterization of properties,a nd testing of nanomaterials able to catalyze the degradation of pollutants, [32][33][34][35][36][37][38][39][40][41] water splitting, [42][43][44][45][46][47][48][49] or the photoreforming of organic compounds. [50][51][52][53] Some materials used for these applications are transition metal oxides, [54][55][56][57][58][59][60][61][62][63][64] oxynitrides, [65][66][67][68][69][70][71][72][73][74][75] oxysulfides, [76][77][78][79][80]…”

Section: Factors Affecting Photocatalytic Hydrogen Generationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

“…[1] Besides cleaner electrochemical processes, [2][3][4][5][6] numerous productionm ethods have been studied to look for am ore sustainable productions ystem such as thermochemical processes using biomass,g asification, [7][8][9][10][11][12][13] and pyrolysis [14][15][16][17][18] and biological processesb yd ark [19][20][21][22][23] and photofermentation [20,[24][25][26][27] using bacteria and microalgae.I fw ec onsider solar energy as af ront-running clean, abundant, and secure energy source,s omer esearchers have faced the increasing demand for energy by proposing ap hotocatalytic hydrogen productionp rocess [28][29][30] as aw ay to store solar energya s chemical energy. [31] Factors affecting photocatalytic hydrogen generation Most studies in the field of photocatalysis are focusedo nt he synthesis,c haracterization of properties,a nd testing of nanomaterials able to catalyze the degradation of pollutants, [32][33][34][35][36][37][38][39][40][41] water splitting, [42]…”

Section: Introduction Hydrogen Role In Energy Scenariomentioning

confidence: 99%

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Operational Conditions Affecting Hydrogen Production by the Photoreforming of Organic Compounds using Titania Nanoparticles with Gold

et al. 2018

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Several factors affect photocatalytic hydrogen productivity from the photoreforming of organic compounds, which makes it difficult to optimize operational conditions in photoreactors. To prioritize these factors, we focused on the quantification of the effect of five of them on hydrogen production. Photocatalytic experiments were performed on 67 mL batch photoreactors under UV‐LED lamps (λ=375 nm) using a suspension of TiO2–Au nanoparticles synthesized by a sol–gel approach. The analyzed factors were: (A) presence of Au as a cocatalyst, (B) type of alcohol as the electron donor, (C) intensity of UV light, (D) electron donor concentration, and (E) nanoparticle concentration. A main and interaction effects analysis is presented with reduced fixed effect models for three responses: total hydrogen generation, catalyst productivity, and electron donor productivity. The presence of Au as a cocatalyst (A), the intensity of UV light (C), and their interaction (AC) were the factors with the highest effect. The best configuration allowed us to reach a catalyst productivity of 2925 μmolnormalH2 g−1 h−1.

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Carbon quantum dots anchored TiO2 nanofibers: Effective photocatalyst for waste water treatment

Cited by 169 publications

References 35 publications

Sustainable Synthesis Processes for Carbon Dots through Response Surface Methodology and Artificial Neural Network

Sustainable Synthesis Processes for Carbon Dots through Response Surface Methodology and Artificial Neural Network

A facile synthesis of nontoxic luminescent carbon dots for detection of chromium and iron in real water sample and bio‐imaging

Operational Conditions Affecting Hydrogen Production by the Photoreforming of Organic Compounds using Titania Nanoparticles with Gold

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