Small molecules derived carbon dots: synthesis and applications in sensing, catalysis, imaging, and biomedicine

Journal of Nanobiotechnology, Год журнала: 2019, Номер 17(1)

Опубликована: Авг. 26, 2019

Carbon dots (CDs) are the new fellow of carbon family having a size less than 10 nm and attracted much attention researchers since last decade because their unique characteristics, such as inexpensive facile synthesis methods, easy surface modification, excellent photoluminescence, outstanding water solubility, low toxicity. Due to these CDs have been extensively applied in different kind scientific disciplines. For example photocatalytic reactions, drug-gene delivery system, vitro vivo bioimaging, chemical biological sensing well photodynamic photothermal therapies. Mainly two types methods available literature synthesize CDs: top-down approach, which refers breaking down more massive structure into nanoscale particles; bottom-up from smaller units (small organic molecules). Many review articles regarding applications CDs. However, there is no article describing complete application derived small molecules together. In this review, we summarized progress research on its (bottom-up approach) via hydrothermal/solvothermal treatment, microwave irradiation, ultrasonic thermal decomposition techniques field drug/gene fluorescence-based sensing, photo-dynamic therapy (PDT) photo-thermal (PTT) based literature. Finally, challenges future direction discussed.

Язык: Английский

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C-, N-Vacancy defect engineered polymeric carbon nitride towards photocatalysis: viewpoints and challenges

Journal of Materials Chemistry A, Год журнала: 2020, Номер 9(1), С. 111 - 153

Опубликована: Ноя. 19, 2020

As an alluring metal-free polymeric semiconductor material, graphite-like carbon nitride (g-C 3 N 4 ; abbreviated as GCN) has triggered a new impetus in the field of photocatalysis, mainly favoured from its fascinating physicochemical and photoelectronic structural features.

Язык: Английский

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Applications of carbon dots in environmental pollution control: A review

Chemical Engineering Journal, Год журнала: 2020, Номер 406, С. 126848 - 126848

Опубликована: Сен. 1, 2020

Язык: Английский

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Band gap tuning and surface modification of carbon dots for sustainable environmental remediation and photocatalytic hydrogen production – A review

Journal of Environmental Management, Год журнала: 2019, Номер 250, С. 109486 - 109486

Опубликована: Сен. 10, 2019

Язык: Английский

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Oxygen Vacancies Promoted the Selective Photocatalytic Removal of NO with Blue TiO₂ via Simultaneous Molecular Oxygen Activation and Photogenerated Hole Annihilation

Environmental Science & Technology, Год журнала: 2019, Номер 53(11), С. 6444 - 6453

Опубликована: Май 3, 2019

Semiconductor photocatalytic technology has great potential for the removal of dilute gaseous NO in indoor and outdoor atmospheres but suffers from unsatisfactory NO-removal selectivity due to undesirable NO2 byproduct generation. In this study, we demonstrate that 99% oxidation toward nitrate can be achieved over blue TiO2 bearing oxygen vacancies (OVs) under visible-light irradiation. First-principles density functional theory calculation experimental results suggested OVs with localized electrons could facilitate molecular activation through single-electron pathways generate ·O2– simultaneously promote photogenerated hole annihilation. The generated directly converted nitrate, while annihilation inhibited side-reaction between holes avoid toxic formation, resulting highly selective NO. This study reveals dual functions defective photocatalysts also provides fundamental guidance purification technology.

Язык: Английский

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Roles of N-Vacancies over Porous g-C₃N₄ Microtubes during Photocatalytic NO_x Removal

ACS Applied Materials & Interfaces, Год журнала: 2019, Номер 11(11), С. 10651 - 10662

Опубликована: Фев. 26, 2019

The development of catalysts that effectively activate target pollutants and promote their complete conversion is an admirable objective in the environmental photocatalysis field. In this work, graphitic carbon nitride (g-C3N4) microtubes with tunable N-vacancy concentrations were controllably fabricated using situ soft-chemical method. morphological evolution g-C3N4, from bulk to porous tubular architecture, discussed detail aid time-resolved hydrothermal experiments. We found NO removal ratio apparent reaction rate constant g-C3N4 1.8 2.6 times higher than those pristine respectively. By combining detailed experimental characterization density functional theory calculations, effects N-vacancies on O2 adsorption activation, electron capture, electronic structure systematically investigated. These results demonstrate surface act as specific sites for activation reactants photoinduced while enhancing light-absorbing capability g-C3N4. Moreover, wall structures as-prepared facilitate diffusion reactants, architectures favor oriented transfer charge carriers. intermediates formed during photocatalytic processes identified by diffuse reflectance infrared Fourier transform spectroscopy, different pathways over N-deficient are proposed. This study provides a feasible strategy air pollution control introducing architecture simultaneously.

Язык: Английский

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Photocatalytic reduction of uranium(VI) by magnetic ZnFe2O4 under visible light

Applied Catalysis B Environment and Energy, Год журнала: 2020, Номер 267, С. 118688 - 118688

Опубликована: Янв. 25, 2020

Язык: Английский

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Visible-light photocatalysts: Prospects and challenges

APL Materials, Год журнала: 2020, Номер 8(3)

Опубликована: Март 1, 2020

In this research update, we discuss the visible-light photocatalysis. Due to potential of utilizing freely available solar energy for environmental remediation and fuel generation, topic has been increasing interest. Huge amount work done in developing a large variety photocatalyst materials, advances have made understanding process. Nevertheless, substantial challenges remain. Some those could possibly be solved by better but many cases, biggest problem is whether photocatalysis scaled up an industrial process that would cost-competitive existing technologies. Here, different types photocatalysts their applications outline various need addressed development practically relevant materials systems.

Язык: Английский

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Activation of amorphous Bi2WO6 with synchronous Bi metal and Bi2O3 coupling: Photocatalysis mechanism and reaction pathway

Applied Catalysis B Environment and Energy, Год журнала: 2018, Номер 232, С. 340 - 347

Опубликована: Март 26, 2018

Язык: Английский

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Peroxymonosulfate activation through LED-induced ZnFe2O4 for levofloxacin degradation

Chemical Engineering Journal, Год журнала: 2021, Номер 417, С. 129225 - 129225

Опубликована: Март 7, 2021

Язык: Английский

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