Valorization of Expired Passion Fruit Shell by Hydrothermal Conversion into Carbon Quantum Dot: Physical and Optical Properties

Hu, Yang; Zhou, Boxun; Yi, Zhang; Liu, Hua‐Min; Liu, Yaowen; He, Yong; Xia, Shibin

doi:10.1007/s12649-020-01132-z

Cited by 34 publications

(14 citation statements)

References 37 publications

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“…The diffractogram of CQDs shows many broad diffraction peaks and sharp diffraction peaks. Broad diffraction peaks of 2θ = 20–30° usually correspond to amorphous carbon and organic material [ 21 ], and the sharp diffraction peaks indicate that the material is not ordinary carbon nanoparticles but carbon quantum dots with better crystallinity [ 22 ]. Thus, broad diffraction peaks of 2θ = 20–30° can be observed in the XRD diffraction patterns of the ZnO/CQDs composite samples with different CQDs doping ratios, in which the broad diffraction peaks will be more obvious with the increase in the CQDs doping ratio.…”

Section: Resultsmentioning

confidence: 99%

Fabrication of ZnO/Carbon Quantum Dots Composite Sensor for Detecting NO Gas

Zhang

Wang

et al. 2020

Sensors

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ZnO and carbon quantum dots (CQDs) were synthesized by a hydrothermal method, and CQDs were doped into ZnO by a grinding method to fabricate a ZnO/CQDs composite. The X-ray diffraction and the scanning electron microscope revealed that the as-prepared ZnO has a structure of wurtzite hexagonal ZnO and a morphology of a flower-like microsphere which can provide more surface areas to adsorbed gases. The ZnO/CQDs composite has a higher gas sensitivity response to NO gas than ZnO microspheres. A gas sensitivity test of the ZnO/CQDs composite showed that the sensor had a high NO response (238 for 100 ppm NO) and NO selectivity. The detection limit of the ZnO/CQDs composite to NO was 100 ppb and the response and recovery times were 34 and 36 s, respectively. The active functional group provided by CQDs has a significant effect on NO gas sensitivity, and the gas sensitivity mechanism of the ZnO/CQDs composite is discussed.

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Section: Resultsmentioning

confidence: 99%

Fabrication of ZnO/Carbon Quantum Dots Composite Sensor for Detecting NO Gas

Zhang

Wang

et al. 2020

Sensors

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“…Their research provided novel ideas and trends for the resource utilization of expired fruits. 35 The synthesis of CQDs from citric acid and EDA through hydrothermal methods is shown in Fig. 3(a) .…”

Section: Synthesis Approachmentioning

confidence: 99%

A review on advancements in carbon quantum dots and their application in photovoltaics

et al. 2022

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“…Since HTC‐F contains a large amount of organic acids, [ 48 ] which could promote the hydrolysis of cellulose to form more pore structures, which could bind more MnO 2 particles. Therefore, we recycled HTC‐F ( Figure a).…”

Section: Resultsmentioning

confidence: 99%

Co‐Hydrothermal Carbonization of Cotton Stalks and MnO₂ for Direct Solar Steam Generation with High Efficiency

et al. 2021

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Biomass‐based photothermal materials for solar steam power generation have been a recent research hotspot. However, despite the many research advances that have been made, many challenges remain. For example, high temperature carbonization leads to the loss of hydrophilicity, the surface coating is easy to peel off, hydrothermal carbonization (HTC) does not guarantee the photothermal performance, and hydrothermal carbonization fluid (HTC‐F) is difficult to handle. Herein, a new material (H‐CS/MnO2) is prepared by co‐hydrothermal carbonization of cotton stalks (CS) and MnO2, and a stable and effective evaporation system is designed. While both ensure super hydrophilicity, the stable loading of MnO2 leads to an excellent photothermal performance. Experimental results show that H‐CS/MnO2 reaches 93.46% evaporation efficiency and the evaporation rate can reach 2.43 kg m−2 h−1 under 1 sun. Moreover, by means of recycling, not only the treatment of HTC solution is solved, but also the carbon dots are continuously enriched and exhibit certain photothermal effects during the recycling process. In addition, H‐CS/MnO2 exhibited excellent salt resistance and corrosion resistance. The obtained condensate heavy ion concentration removal rate reached more than 99.9%. Therefore, the H‐CS/MnO2 fabricated herein has the possibility of practical application in the future.

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Valorization of Expired Passion Fruit Shell by Hydrothermal Conversion into Carbon Quantum Dot: Physical and Optical Properties

Cited by 34 publications

References 37 publications

Fabrication of ZnO/Carbon Quantum Dots Composite Sensor for Detecting NO Gas

Fabrication of ZnO/Carbon Quantum Dots Composite Sensor for Detecting NO Gas

A review on advancements in carbon quantum dots and their application in photovoltaics

Co‐Hydrothermal Carbonization of Cotton Stalks and MnO₂ for Direct Solar Steam Generation with High Efficiency

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Valorization of Expired Passion Fruit Shell by Hydrothermal Conversion into Carbon Quantum Dot: Physical and Optical Properties

Cited by 34 publications

References 37 publications

Fabrication of ZnO/Carbon Quantum Dots Composite Sensor for Detecting NO Gas

Fabrication of ZnO/Carbon Quantum Dots Composite Sensor for Detecting NO Gas

A review on advancements in carbon quantum dots and their application in photovoltaics

Co‐Hydrothermal Carbonization of Cotton Stalks and MnO2 for Direct Solar Steam Generation with High Efficiency

Contact Info

Product

Resources

About

Co‐Hydrothermal Carbonization of Cotton Stalks and MnO₂ for Direct Solar Steam Generation with High Efficiency