scholarly journals Environmental Remediation: Crafting Mussel‐Inspired Metal Nanoparticle‐Decorated Ultrathin Graphitic Carbon Nitride for the Degradation of Chemical Pollutants and Production of Chemical Resources (Adv. Mater. 15/2019)

2019 ◽  
Vol 31 (15) ◽  
pp. 1970110 ◽  
Author(s):  
Jingsheng Cai ◽  
Jianying Huang ◽  
Shanchi Wang ◽  
James Iocozzia ◽  
Zhongti Sun ◽  
...  
Keyword(s):  
Environmental Remediation ◽  
Carbon Nitride ◽  
Graphitic Carbon ◽  
Metal Nanoparticle ◽  
Graphitic Carbon Nitride ◽  
Chemical Pollutants

scholarly journals 2D/2D layered nano-heterostructures of transition metal dichalcogenides (MS2, M = Mo, Sn) and graphitic carbon nitride (g-C3N4) for photocatalytic hydrogen production and environmental remediation

2021 ◽  
Author(s):  
Ειρήνη Κουτσουρούμπη
Keyword(s):  
Hydrogen Production ◽  
Transition Metal ◽  
Environmental Remediation ◽  
Carbon Nitride ◽  
Transition Metal Dichalcogenides ◽  
Graphitic Carbon ◽  
Graphitic Carbon Nitride ◽  
Photocatalytic Hydrogen Production ◽  
Metal Dichalcogenides

Οι εξαιρετικά αποδοτικοί και οικονομικά αποδοτικοί φωτοκαταλύτες είναι από τους πιο σημαντικούς στόχους στον τομέα της παραγωγής καθαρής ενέργειας και της περιβαλλοντικής αποκατάστασης. Για να κατανοήσουμε τους μηχανισμούς φωτοχημικής μεταφοράς φορτίου στη νανοκλίμακα, είναι απαραίτητο να αναπτυχθούν καταλύτες υψηλής αποτελεσματικότητας. Η παρούσα διδακτορική διατριβή επικεντρώνεται στην επιτυχή ανάπτυξη μιας νέας συνθετικής στρατηγικής για την προετοιμασία 2D/2D πολυεπίπεδων νανο-ετεροδομών διχαλκογονιδίων μετάλλων μετάπτωσης (MS2, M = Mo, Sn) και γραφιτικού νιτριδίου του άνθρακα (g-C3N4) για εφαρμογές στην φωτοκαταλυτική παραγωγή καυσίμων και περιβαλλοντική αποκατάσταση . Σε αυτό το πλαίσιο, ο ορθολογικός σχεδιασμός νέων φωτοχημικών συστημάτων μας οδήγησε στη σύνθεση πολυεπίπεδων ετεροδομών με την εναπόθεση νανοφυλλών MoS2 με μεταβλητά πλευρικά μεγέθη στην επιφάνεια του g-C3N4. Αυτές οι σύνθετες δομές μελετήθηκαν ως καθοδικοί καταλύτες για φωτοκαταλυτική παραγωγή υδρογόνου από νερό υπό υπεριώδη ακτινοβολία και ορατό φως. Γενικά, ο φωτοχημικός διαχωρισμός του νερού για την παραγωγή υδρογόνου είναι μια πολύ ελκυστική και πολλά υποσχόμενη λύση στην ενεργειακή κρίση και στο πρόβλημα της κλιματικής αλλαγής. Αυτή η διαδικασία περιλαμβάνειτην αναγωγή των πρωτονίων του νερού σε μοριακό υδρογόνο στην επιφάνεια ενός ημιαγώγιμου καταλύτη. Από την άλλη πλευρά, τα περιβαλλοντικά προβλήματα των υδάτων οφείλονται κυρίως στη ρύπανση του νερού που προκαλείται από ιδιαίτερα τοξικά και καρκινογόνα μεταλλικά ιόντα, όπως το εξασθενές χρώμιο (Cr(VI)). Για το λόγο αυτό, καταφέραμε να συνθέσουμε νανο-ετεροδομές MoS2/g-C3N4 ντοπαρισμένες με Ni, καθώς και νανο-ετεροδομές SnS2/g-C3N4 που επιδεικνύουν υψηλή φωτοκαταλυτική δράση στην αναγωγή του Cr(VI) στην πολύ λιγότερο τοξική μορφή χρωμίου, Cr(III). Ένα αξιοσημείωτο σημείο αυτών των καταλυτικών συστημάτων είναι ότι όλες οι αντιδράσεις φωτοχημικής αναγωγής πραγματοποιήθηκαν σε υδατικά διαλύματα Cr(VI) χωρίς την παρουσία θυσιαζόμενων ενώσεων ως δοτών ηλεκτρονίων. Όλες οι παραπάνω ετεροσυνδέσεις μπορούν να διευκολύνουν τον υψηλό ρυθμό διαχωρισμού και μεταφοράς των φωτοεπαγόμενων φορέων φορτίου, επιδεικνύοντας βελτιωμένη καταλυτική συμπεριφορά έναντι των μακροσκοπικών αναλόγων τους στην παραγωγή υδρογόνου καθώς και στην αναγωγή του εξασθενούς χρωμίου. Οι φωτοκαταλυτικές αντιδράσεις πραγματοποιήθηκαν με τη χρήση οικονομικά αποδοτικών και φιλικών προς το περιβάλλον αντιδραστηρίων και τη χρήση ανανεώσιμων πηγών ενέργειας για την επίλυση βασικών ενεργειακών και περιβαλλοντικών προκλήσεων.

scholarly journals Nitrogen-doped Carbon Nanospheres-Modified Graphitic Carbon Nitride with Outstanding Photocatalytic Activity

2020 ◽  
Vol 12 (1) ◽  
Author(s):  
Qiaoran Liu ◽  
Hao Tian ◽  
Zhenghua Dai ◽  
Hongqi Sun ◽  
Jian Liu ◽  
...  
Keyword(s):  
Environmental Remediation ◽  
Density Functional ◽  
Carbon Nitride ◽  
Graphitic Carbon ◽  
Graphitic Carbon Nitride ◽  
Carbon Nanospheres ◽  
Electron Hole ◽  
Practical Applications ◽  
Nitrogen Doped ◽  
Nitrogen Doped Carbon

AbstractMetals and metal oxides are widely used as photo/electro-catalysts for environmental remediation. However, there are many issues related to these metal-based catalysts for practical applications, such as high cost and detrimental environmental impact due to metal leaching. Carbon-based catalysts have the potential to overcome these limitations. In this study, monodisperse nitrogen-doped carbon nanospheres (NCs) were synthesized and loaded onto graphitic carbon nitride (g-C3N4, GCN) via a facile hydrothermal method for photocatalytic removal of sulfachloropyridazine (SCP). The prepared metal-free GCN-NC exhibited remarkably enhanced efficiency in SCP degradation. The nitrogen content in NC critically influences the physicochemical properties and performances of the resultant hybrids. The optimum nitrogen doping concentration was identified at 6.0 wt%. The SCP removal rates can be improved by a factor of 4.7 and 3.2, under UV and visible lights, by the GCN-NC composite due to the enhanced charge mobility and visible light harvesting. The mechanism of the improved photocatalytic performance and band structure alternation were further investigated by density functional theory (DFT) calculations. The DFT results confirm the high capability of the GCN-NC hybrids to activate the electron–hole pairs by reducing the band gap energy and efficiently separating electron/hole pairs. Superoxide and hydroxyl radicals are subsequently produced, leading to the efficient SCP removal.

scholarly journals Dual-defect-modified graphitic carbon nitride with boosted photocatalytic activity under visible light

2019 ◽  
Vol 9 (1) ◽  
Author(s):  
Hideyuki Katsumata ◽  
Fumiya Higashi ◽  
Yuya Kobayashi ◽  
Ikki Tateishi ◽  
Mai Furukawa ◽  
...  
Keyword(s):  
Photocatalytic Activity ◽  
Visible Light ◽  
Environmental Remediation ◽  
Carbon Nitride ◽  
Order Rate Constant ◽  
Graphitic Carbon ◽  
Graphitic Carbon Nitride ◽  
Strong Electron ◽  
Efficient Charge

Abstract The development of photocatalysts that efficiently degrade organic pollutants is an important environmental-remediation objective. To that end, we report a strategy for the ready fabrication of oxygen-doped graphitic carbon nitride (CN) with engendered nitrogen deficiencies. The addition of KOH and oxalic acid during the thermal condensation of urea led to a material that exhibits a significantly higher pseudo-first-order rate constant for the degradation of bisphenol A (BPA) (0.0225 min−1) compared to that of CN (0.00222 min−1). The enhanced photocatalytic activity for the degradation of BPA exhibited by the dual-defect-modified CN (Bt-OA-CN) is ascribable to a considerable red-shift in its light absorption compared to that of CN, as well as its modulated energy band structure and more-efficient charge separation. Furthermore, we confirmed that the in-situ-formed cyano groups in the Bt-OA-CN photocatalyst act as strong electron-withdrawing groups that efficiently separate and transfer photo-generated charge carriers to the surface of the photocatalyst. This study provides novel insight into the in-situ dual-defect strategy for g-C3N4, which is extendable to the modification of other photocatalysts; it also introduces Bt-OA-CN as a potential highly efficient visible-light-responsive photocatalyst for use in environmental-remediation applications.

Enhanced Photocatalytic Degradation Activity of 2-D Graphitic Carbon Nitride-SnO2 Nanohybrids

2019 ◽  
Vol 19 (6) ◽  
pp. 3576-3582 ◽  
Author(s):  
Kiran Preethi Kirubakaran ◽  
Sakthivel Thangavel ◽  
Gouthami Nallamuthu ◽  
Vinesh Vasudevan ◽  
Priya Arul Selvi Ramasubramanian ◽  
...  
Keyword(s):  
Photocatalytic Activity ◽  
Environmental Remediation ◽  
Carbon Nitride ◽  
Waste Water Treatment ◽  
Sol Gel ◽  
Point Contact ◽  
Order Rate Constant ◽  
Graphitic Carbon ◽  
Graphitic Carbon Nitride ◽  
Potential Applications

In this paper, we report on the facile synthesis of graphitic carbon nitride (g-C3N4)-tin oxide (SnO2) nanohybrid as an efficient photocatalyst prepared via sol–gel method. SnO2 nanoparticles are pointcontacted with g-C3N4. The results of physio-chemical characterizations such as SEM-EDAX, XRD, BET, FT-IR and UV-DRS spectra reveal the successful formation and integration of nanohybrid. The photocatalytic activity has been studied by using methylene-blue as a model dye for degradation. It has been observed that the pseudo-first order rate constant was increased up to 1.78 times compared with pure SnO2. The enhanced photocatalytic activity was ascribed from the inhibition of electron–hole recombination where g-C3N4 nanosheets acts as an electron receiver from SnO2 via point contact. This mechanism is further verified via photoluminescence spectra. Our results prominently show new insights and potential applications of g-C3N4-SnO2 nanohybrids in the waste water treatment and environmental remediation sectors.

UV-Vis-NIR full-range responsive carbon-rich carbon nitride nanotubes for enhanced photocatalytic performance

2022 ◽  
Author(s):  
Fan Xu ◽  
Qi Yao ◽  
Yan Zhang ◽  
Zhao Mo ◽  
Junjie Yuan ◽  
...  
Keyword(s):  
Energy Conversion ◽  
Environmental Remediation ◽  
Carbon Nitride ◽  
Photocatalytic Performance ◽  
Full Range ◽  
Graphitic Carbon ◽  
Graphitic Carbon Nitride

As a star photocatalyst, graphitic carbon nitride has been widely used in environmental remediation and energy conversion. However, graphitic carbon nitride still has some distinct shortcomings, such its utilization of...

β-Cyclodextrin modified graphitic carbon nitride for the removal of pollutants from aqueous solution: experimental and theoretical calculation study

2016 ◽  
Vol 4 (37) ◽  
pp. 14170-14179 ◽  
Author(s):  
Yidong Zou ◽  
Xiangxue Wang ◽  
Yuejie Ai ◽  
Yunhai Liu ◽  
Yongfei Ji ◽  
...  
Keyword(s):  
Aqueous Solution ◽  
Methyl Orange ◽  
Theoretical Calculation ◽  
Environmental Remediation ◽  
Carbon Nitride ◽  
Graphitic Carbon ◽  
Graphitic Carbon Nitride

The enhanced interaction of β-cyclodextrin modified graphitic carbon nitride (g-C3N4/β-CD) or g-C3N4 with methyl orange (MO) or Pb(ii) in natural environmental remediation.

Recent Advances in g-C3N4-based Photocatalysts Incorporated by MXenes and Their Derivatives

2021 ◽  
Author(s):  
Huilin Hou ◽  
Gang Shao ◽  
Weiyou Yang
Keyword(s):  
Solar Energy ◽  
Visible Light ◽  
Energy Conversion ◽  
Environmental Remediation ◽  
Carbon Nitride ◽  
Solar Energy Conversion ◽  
Graphitic Carbon ◽  
Graphitic Carbon Nitride ◽  
Two Dimensional ◽  
Recent Advances

As one of fascinating visible-light-responsive photocatalysts, the two-dimensional (2D) graphitic carbon nitride (g-C3N4) has drawn broad attention in the field of solar energy conversion and environmental remediation. However, its intrinsic...

Size controlled Silver Nanoparticles on -cyclodextrin/Graphitic Carbon Nitride: An excellent nanohybrid material for SERS and Catalysis Applications

2021 ◽  
Author(s):  
Santhoshkumar S ◽  
Murugan Eagambaram
Keyword(s):  
Silver Nanoparticles ◽  
Environmental Remediation ◽  
Carbon Nitride ◽  
Graphitic Carbon ◽  
Graphitic Carbon Nitride ◽  
High Dispersion ◽  
Size Controlled ◽  
Nanohybrid Material

A nanohybrid(NH), having high dispersion of silver nanoparticles(AgNPs) on β-cyclodextrin(β-CD)/graphitic carbon nitride(g-CN), designated as AgNPs/β-CD/g-CN-NH, was synthesized and characterized. It was exploited for a couple of environmental remediation applications like...

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