Photocatalytic and photo-fenton activity of iron oxide-doped carbon nitride in 3D printed and LED driven photon concentrator

Desipio, Matthew M.; Bramer, Scott E. Van; Thorpe, Ryan; Saha, Dipendu

doi:10.1016/j.jhazmat.2019.05.037

Cited by 50 publications

(13 citation statements)

References 37 publications

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“…First, visible light itself was able to dissociate H 2 O 2 to induce 11.8% of BPA removal (Equation ( 7)). [38] Second, the holes may contribute to the production of •OH radicals via Equation (8), which leads to the slightly enhanced degradation of BPA at high solution pH (Figure S13, Supporting Information). Finally, the exposed single-atom Cr sites played the leading role in the activation of H 2 O 2 (Equation ( 9)), as evidenced by the above quench experiments and kinetic studies.…”

Section: Mechanism Studiesmentioning

confidence: 99%

Molecular Engineering toward Pyrrolic N‐Rich M‐N₄ (M = Cr, Mn, Fe, Co, Cu) Single‐Atom Sites for Enhanced Heterogeneous Fenton‐Like Reaction

Chen

Shi

et al. 2021

Adv Funct Materials

184

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Heterogeneous Fenton‐like reactions (HFLR) are promising alternative strategies to address the inherent limitations of the classic Fenton systems. Herein, a facile and scale‐up approach for the synthesis of transition metal single‐atom sites (SA‐TM, TM = Cr, Mn, Fe, Co, Cu) coordinated onto pyrrolic N‐rich g‐C3N4 (PN‐g‐C3N4) scaffold is developed. The regulated pyrrolic N‐rich SA‐TM catalytic sites exhibit excellent performances for HFLR. As a model of SA‐TM/PN‐g‐C3N4, SA‐Cr/PN‐g‐C3N4 is efficient for the catalytic oxidation of bisphenol A via HFLR under visible light with outstanding cyclic stability and wide effective pH range (3.0–11.0). The synergy of photocatalysis and single‐atom catalysis leads to accelerated production and separation of charge carriers as well as the cycling of Cr3+/Cr2+ couple, consequently boosting the performance in HFLR. Theoretical calculations indicate that the Cr(II)‐N4 sites with the metalloporphyrin‐like structure are more reactive than the doped Cr(II) sites in the g‐C3N4 matrix, which act as the peroxidase‐mimicking nanozyme for efficient and homolytic cleavage of peroxide OO in H2O2. This study expands the family of the iron‐free Fenton‐like systems and provides new strategies to the rational design and precise regulation of on‐demand multifunctional single‐atom catalysts for advanced water remediation.

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Section: Mechanism Studiesmentioning

confidence: 99%

Molecular Engineering toward Pyrrolic N‐Rich M‐N₄ (M = Cr, Mn, Fe, Co, Cu) Single‐Atom Sites for Enhanced Heterogeneous Fenton‐Like Reaction

Chen

Shi

et al. 2021

Adv Funct Materials

184

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“…Iron-doped CN photocatalysts result on the combination of traditional Fenton and CN photocatalysis which enhances oxidation by promoting a two-channel pathway of H 2 O 2 reduction to generate HO • . In this way, many authors have synthesized iron-doped CN to try combat the disadvantage of dissolved iron in the mineralized waters [149][150][151][152].…”

Section: Pollutant Degradationmentioning

confidence: 99%

Recent Strategies for Hydrogen Peroxide Production by Metal-Free Carbon Nitride Photocatalysts

et al. 2019

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Hydrogen peroxide (H2O2) is a chemical which has gained wide importance in several industrial and research fields. Its mass production is mostly performed by the anthraquinone (AQ) oxidation reaction, leading to high energy consumption and significant generation of wastes. Other methods of synthesis found in the literature include the direct synthesis from oxygen and hydrogen. However, this H2O2 production process is prone to explosion hazard or undesirable by‑product generation. With the growing demand of H2O2, the development of cleaner and economically viable processes has been under intense investigation. Heterogeneous photocatalysis for H2O2 production has appeared as a promising alternative since it requires only an optical semiconductor, water, oxygen, and ideally solar light irradiation. Moreover, employing a metal-free semiconductor minimizes possible toxicity consequences and reinforces the sustainability of the process. The most studied metal‑free catalyst employed for H2O2 production is polymeric carbon nitride (CN). Several chemical and physical modifications over CN have been investigated together with the assessment of different sacrificial agents and light sources. This review shows the recent developments on CN materials design for enhancing the synthesis of H2O2, along with the proposed mechanisms of H2O2 production. Finally, the direct in situ generation of H2O2, when dealing with the photocatalytic synthesis of added-value organic compounds and water treatment, is discussed.

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“…However, the application of 3D printing and computational modeling (CAD, CAM) for the design and fabrication of chemical reactors for advanced oxidation processes (AOPs), in particular photo-Fenton reactors, has been hardly addressed [ 14 , 15 ], and a systematic approach for material selection for 3D printing such reactors is also missing [ 1 ].…”

Section: Introductionmentioning

confidence: 99%

Manufacturing and Application of 3D Printed Photo Fenton Reactors for Wastewater Treatment

Esfahani

Zandi

Travieso-Rodríguez

et al. 2021

IJERPH

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Additive manufacturing (AM) or 3D printing offers a new paradigm for designing and developing chemical reactors, in particular, prototypes. The use of 3D printers has been increasing, their performance has been improving, and their price has been reducing. While the general trend is clear, particular applications need to be assessed for their practicality. This study develops and follows a systematic approach to the prototyping of Advanced Oxidation Processes (AOP) reactors. Specifically, this work evaluates and discusses different printable materials in terms of mechanical and chemical resistance to photo-Fenton reactants. Metallic and ceramic materials are shown to be impracticable due to their high printing cost. Polymeric and composite materials are sieved according to criteria such as biodegradability, chemical, thermal, and mechanical resistance. Finally, 3D-printed prototypes are produced and tested in terms of leakage and resistance to the photo-Fenton reacting environment. Polylactic acid (PLA) and wood–PLA composite (Timberfill®) were selected, and lab-scale raceway pond reactors (RPR) were printed accordingly. They were next exposed to H2O2/Fe(II) solutions at pH = 3 ± 0.2 and UV radiation. After 48 h reaction tests, results revealed that the Timberfill® reactor produced higher Total Organic Carbon (TOC) concentrations (9.6 mg·L−1) than that obtained for the PLA reactor (5.5 mg·L−1) and Pyrex® reactor (5.2 mg·L−1), which suggests the interference of Timberfill® with the reaction. The work also considers and discusses further chemical and mechanical criteria that also favor PLA for 3D-printing Fenton and photo-Fenton reactors. Finally, the work also provides a detailed explanation of the printing parameters used and guidelines for preparing prototypes.

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Photocatalytic and photo-fenton activity of iron oxide-doped carbon nitride in 3D printed and LED driven photon concentrator

Cited by 50 publications

References 37 publications

Molecular Engineering toward Pyrrolic N‐Rich M‐N₄ (M = Cr, Mn, Fe, Co, Cu) Single‐Atom Sites for Enhanced Heterogeneous Fenton‐Like Reaction

Molecular Engineering toward Pyrrolic N‐Rich M‐N₄ (M = Cr, Mn, Fe, Co, Cu) Single‐Atom Sites for Enhanced Heterogeneous Fenton‐Like Reaction

Recent Strategies for Hydrogen Peroxide Production by Metal-Free Carbon Nitride Photocatalysts

Manufacturing and Application of 3D Printed Photo Fenton Reactors for Wastewater Treatment

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Photocatalytic and photo-fenton activity of iron oxide-doped carbon nitride in 3D printed and LED driven photon concentrator

Cited by 50 publications

References 37 publications

Molecular Engineering toward Pyrrolic N‐Rich M‐N4 (M = Cr, Mn, Fe, Co, Cu) Single‐Atom Sites for Enhanced Heterogeneous Fenton‐Like Reaction

Molecular Engineering toward Pyrrolic N‐Rich M‐N4 (M = Cr, Mn, Fe, Co, Cu) Single‐Atom Sites for Enhanced Heterogeneous Fenton‐Like Reaction

Recent Strategies for Hydrogen Peroxide Production by Metal-Free Carbon Nitride Photocatalysts

Manufacturing and Application of 3D Printed Photo Fenton Reactors for Wastewater Treatment

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Product

Resources

About

Molecular Engineering toward Pyrrolic N‐Rich M‐N₄ (M = Cr, Mn, Fe, Co, Cu) Single‐Atom Sites for Enhanced Heterogeneous Fenton‐Like Reaction

Molecular Engineering toward Pyrrolic N‐Rich M‐N₄ (M = Cr, Mn, Fe, Co, Cu) Single‐Atom Sites for Enhanced Heterogeneous Fenton‐Like Reaction