Fabrication of interlayer β-CD/g-C3N4@MoS2 for highly enhanced photodegradation of glyphosate under simulated sunlight irradiation

He, Xiufang; Wu, Zhansheng; Xue, Yongtao; Gao, Zhenzhen; Xia, Yang

doi:10.1039/c8ra10190f

Cited by 28 publications

(8 citation statements)

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“…Unfortunately, conventional sewage treatment systems are not able to efficiently remove new emerging molecular pollutants. , Photocatalysis has therefore received increasing attention for water contaminant degradation. − Photocatalysis enables ecologically friendly wastewater purification, by photodegradation, facilitated by the generation of highly oxidizing species. Previously, heterogeneous photocatalysts have been used for wastewater treatment based on different materials ranging from inorganic materials such as TiO 2 to nanodots and conjugated polymers. − …”

Section: Introductionmentioning

confidence: 99%

Photocatalytic Hydrogels with a High Transmission Polymer Network for Pollutant Remediation

et al. 2021

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Efficient heterogeneous and metal-free photocatalysts have recently been targeted as reusable materials for pollutant remediation. However, poor light penetration into photocatalytic materials currently limits modern photocatalytic systems due to uneven performance across the photocatalytic material and inefficient light usage. Here, we present a classical photocatalytic polymer hydrogel composed of a high transmittance polymer network and small conjugated photocatalytic moieties. Radical copolymerization of a photocatalytically active benzothiadiazole acrylamide monomer with water-compatible N,N-dimethylacrylamide produced a photocatalytic hydrogel where only the photocatalytic moiety absorbs visible light. The photocatalytic hydrogel network enables easy partitioning of pollutants into the gel network, where they are photocatalytically degraded. The versatility and reusability of the photocatalytic material were demonstrated for degradation of both inorganic metal and organic contaminants, including N-(phosphonomethyl)glycine (glyphosate), the most commonly used herbicide. Furthermore, the potential of this material was explored in large-scale experiments, where glyphosate could be readily photodegraded at a half liter scale.

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Section: Introductionmentioning

confidence: 99%

Photocatalytic Hydrogels with a High Transmission Polymer Network for Pollutant Remediation

et al. 2021

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“…Glyphosate [N-(phosphonomethyl)-glycine] is an organophosphate herbicide, widely used for controlling various sedges, plants, unwanted vegetation, weeds, and grasses (Guo et al 2005;He et al 2019). Water contamination (ground and surface) through irrigation of crop fields, leaks, and discharge from industry has been reported (Hu et al 2011;Cosgrove et al 2019).…”

Section: Introductionmentioning

confidence: 99%

Glyphosate adsorption by Eucalyptus camaldulensis bark-mediated char and optimization through response surface modeling

2019

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In this study, orthophosphoric acid-modified activated char was prepared from Eucalyptus camaldulensis bark (EBAC), and used for removing traces of [N-(phosphonomethyl)glycine] (glyphosate) herbicide from aqueous solution. The adsorption capacity was characterized by zero-point-charge pH, surface analysis, and Fourier transform infrared spectroscopy. Batch mode experiments were conducted to observe the effects of selected variables, namely dose, contact time, pH, temperature, and initial concentration, on adsorption capacity. Langmuir, Freundlich, Temkin, and Dubinin-Radushkevich isotherm models were generated to describe the mechanisms involved in the multilayer adsorption process. The results show that high temperature enhanced the adsorption capacity of EBAC, with a temperature of 373 K yielding adsorption capacity (q max) and Freundlich parameter (K F) of 66.76 mg g −1 and 9.64 (mg g −1) (L mg −1) −n , respectively. The thermodynamics study revealed entropy and enthalpy of −5281.3 J mol −1 and −20.416 J mol −1 , respectively. Finally, glyphosate adsorption was optimized by the Box-Behnken model, and optimal conditions were recorded as initial concentration of 20.28 mg L −1 , pH 10.18, adsorbent dose of 199.92 mg/50 mL, temperature of 303.23 K, and contact time of 78.42 min, with removal efficiency of 98%. Therefore, it can be suggested that EBAC could be used as an efficient, low-cost adsorbent for removal of glyphosate from aqueous solutions.

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“…Additionally, the ability of the photo‐generated carriers of g‐C 3 N 4 /MoS 2 /MnOOH composite material and its components to recombine during the photocatalytic process was determined by the fluorescence decay time using a 325 nm pulsed diode laser, which was measured and plotted, fitting the curves with a biexponential decay function defined by

l (t) = A_{1} \exp (- t / τ_{1}) + A_{2} \exp (- t / τ_{2})

…”

Section: Methodsmentioning

confidence: 99%

Hydrothermal synthesis of a two‐dimensional g‐C₃N₄/MoS₂/MnOOH composite material and its potential application as photocatalyst

Jiménez-Rangel

Lartundo‐Rojas

García‐García

et al. 2019

J of Chemical Tech & Biotech

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BACKGROUND: Environmental pollution and energy crisis are nowadays considered among the most important problems facing humanity. Several strategies have been proposed to solve them, being photocatalysis a very promising one because of its ease of application and low cost. In the search for active photocatalysts, those based on graphite-like carbon nitride (g-C 3 N 4 ) are becoming good alternatives for various reactions. In this work, the properties of g-C 3 N 4 /MoS 2 /MnOOH composite material and its photocatalytic behavior for the production of hydrogen (H 2 ) under UV radiation were investigated. RESULTS:The composite material was synthesized by applying a combination of thermal condensation and hydrothermal methods. According to the results of X-ray diffraction (XRD), ultraviolet diffuse reflectance spectroscopy (UV-DRS), scanning electron microscopy (SEM), X-ray photoelectron spectroscopy (XPS) and transmission electron microscopy (TEM), good dispersion of the phases and the formation of a heterojunction were observed. The band gap value of the composite material, calculated by the Kubelka-Munk equation using the values obtained from UV-DRS analysis, was lower than those of the individual components, while it also had a much longer electron-hole recombination time, according to photoluminescence analysis. As a consequence of a synergistic effect, the activity of the proposed composite photocatalyst was superior in the reaction of water splitting, with a kinetic constant of 466 mol h −1 and a production rate of 1750 mol H 2 g −1 cat h −1 (50 and 21% higher than those obtained with MoS 2 and g-C 3 N 4 , respectively). CONCLUSION: Because of its high activity and stability, g-C 3 N 4 /MoS 2 /MnOOH composite photocatalyst is an excellent alternative for H 2 production by the water splitting reaction. REFERENCES1 Sun H and Wang S, Research advances in the synthesis of nanocarbon-based photocatalysts and their applications for photocatalytic conversion of carbon dioxide to hydrocarbon fuels. Energy Fuels 28:22-36 (2014).

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Fabrication of interlayer β-CD/g-C₃N₄@MoS₂ for highly enhanced photodegradation of glyphosate under simulated sunlight irradiation

Abstract: The fabrication of an interlayer β-CD/g-C3N4@MoS2 composite photocatalyst for highly enhanced photodegradation of glyphosate and a toxicity test.

Cited by 28 publications

References 40 publications

Photocatalytic Hydrogels with a High Transmission Polymer Network for Pollutant Remediation

Photocatalytic Hydrogels with a High Transmission Polymer Network for Pollutant Remediation

Glyphosate adsorption by Eucalyptus camaldulensis bark-mediated char and optimization through response surface modeling

Hydrothermal synthesis of a two‐dimensional g‐C₃N₄/MoS₂/MnOOH composite material and its potential application as photocatalyst

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Fabrication of interlayer β-CD/g-C3N4@MoS2 for highly enhanced photodegradation of glyphosate under simulated sunlight irradiation

Abstract: The fabrication of an interlayer β-CD/g-C3N4@MoS2 composite photocatalyst for highly enhanced photodegradation of glyphosate and a toxicity test.

Cited by 28 publications

References 40 publications

Photocatalytic Hydrogels with a High Transmission Polymer Network for Pollutant Remediation

Photocatalytic Hydrogels with a High Transmission Polymer Network for Pollutant Remediation

Glyphosate adsorption by Eucalyptus camaldulensis bark-mediated char and optimization through response surface modeling

Hydrothermal synthesis of a two‐dimensional g‐C3N4/MoS2/MnOOH composite material and its potential application as photocatalyst

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Fabrication of interlayer β-CD/g-C₃N₄@MoS₂ for highly enhanced photodegradation of glyphosate under simulated sunlight irradiation

Hydrothermal synthesis of a two‐dimensional g‐C₃N₄/MoS₂/MnOOH composite material and its potential application as photocatalyst