Removal of chlorpyrifos, an insecticide using metal free heterogeneous graphitic carbon nitride (g-C3N4) incorporated chitosan as catalyst: Photocatalytic and adsorption studies

Vigneshwaran, Sivakumar; Preethi, Jayaram; Meenakshi, Sankaran

doi:10.1016/j.ijbiomac.2019.03.071

Cited by 104 publications

(20 citation statements)

References 26 publications

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“…All the aforementioned results indicate the successful functionalization of UCN with COS 20 molecules. [ 53 ] Furthermore, it can be noticed that the broad peak in the range of 3000−3500 cm −1 is normally attributed to the surficial OH and NH 2 groups, which is enhanced after modifying COS 20 , as COS 20 itself contains enriched OH and NH 2 groups.…”

Section: Resultsmentioning

confidence: 99%

Synergetic Subnano Ni‐ and Mn‐Oxo Clusters Anchored by Chitosan Oligomers on 2D g‐C₃N₄ Boost Photocatalytic CO₂ Reduction

Kang

Bai

et al. 2020

Solar RRL

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Synergistic modulation of photogenerated electrons and holes of g‐C3N4 especially achieved by simply modifying bimetallic species is highly desired for efficient photocatalytic CO2 reduction. Herein, ultrasmall subnano Ni‐ and Mn‐oxo clusters (average diameter of ≈0.8 nm) are uniformly anchored on tailored chitosan oligomer (COS)‐functionalized ultrathin g‐C3N4 nanosheets via OH and NH2 in COS as the coordination sites. Optimized Ni and Mn comodified photocatalyst obtained by regulating bimetallic molar ratio exceptionally exhibits 22‐times CO2 conversion rate under solar‐light irradiation and ≈20‐times quantum efficiency at 405 nm light compared with pristine g‐C3N4. By electron paramagnetic resonance, surface photovoltage spectroscopy, fluorescence spectra, photoluminescence spectra, and electrochemical curves, it is evidenced the enhanced photoactivities originate from the synergetic effect between Ni‐ and Mn‐oxo species, capable of photoelectron‐capture along with catalytic CO2 activation and hole‐capture along with catalytic H2O activation, respectively. More importantly, due to the carrier‐modulating capability difference, it is verified only a matching Ni:Mn molar ratio leads to the best charge separation then photoactivity as supported by the transient‐state photoluminescence spectra. A new avenue to rationally modulate photogenerated charge carriers for fabricating efficient g‐C3N4‐based photocatalysts for solar‐fuel production is proposed.

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Section: Resultsmentioning

confidence: 99%

Synergetic Subnano Ni‐ and Mn‐Oxo Clusters Anchored by Chitosan Oligomers on 2D g‐C₃N₄ Boost Photocatalytic CO₂ Reduction

Kang

Bai

et al. 2020

Solar RRL

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“…Hu et al reported that the common ions coexisting in solution invariably compete with Cr(VI) for the limited adsorption sites of maghemite nanoparticle adsorbent [25]. In this study, the influence of coexisting common ions was performed with cations (Na + , K + , Mg 2+ , Ca 2+ ) and anions (Cl − , NO3 − , SO4 2− , PO4 3− ) at a concentration of 10 mg/dm 3 for each [21]. The concentration of Cr(VI) and Cu(II) was 1.0 mg/dm 3 for each in double-distilled water, and the dose of Fe3O4 was 2.0 g/dm 3 .…”

Section: The Effect Of Coexisting Common Ionsmentioning

confidence: 99%

“…The adsorption for Cu 2+ is caused by both electrostatic adsorption and ion exchange at high pH [20]. The adsorption of Cr(VI) and Cu(II) on Fe 3 O 4 under pH of 2.0-6.5 is represented in Figure 5 [21]. Because of the protonation and deprotonation effects, certain surface groups of −FeOH 2+ and −Fe + were formed on the surface of Fe 3 the decrease of adsorption for Cr(VI).…”

Section: The Effect Of Ph and Zeta Potentialmentioning

confidence: 99%

Adsorption Properties of Magnetic Magnetite Nanoparticle for Coexistent Cr(VI) and Cu(II) in Mixed Solution

Jin

Lin

Han

et al. 2020

Water

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The adsorption properties of coexistent Cr(VI) and Cu(II) in mixed solution on magnetic magnetite (Fe3O4) nanoparticle were studied in batch experiments. The influences of various factors, such as pH, adsorbent dose, temperature, initial concentration of metal ions, and coexisting ions in water were investigated. At the same time, the adsorption kinetics and adsorption isotherms were studied. The mechanism of adsorption for Cr(VI) and Cu(II) was investigated through the study of surface properties of Fe3O4, the presence of ions, and the influence of pH and zeta potential. The results indicate that pH has an influence on adsorption for Cr(VI) and Cu(II), and the optimal pH value for Cr(VI) and Cu(II) adsorption is 4.0. The adsorption efficiency increased with the increase of the adsorbent dose. Temperature under experimental design had no obvious effect. With 2.0 g/dm3 Fe3O4, the maximum adsorption capacity for Cr(VI) and Cu(II) reached 8.67 mg/g and 18.61 mg/g in mixed solution of 80 mg/dm3 Cr(VI) and Cu(II), respectively. Phosphorus had some influence on the adsorption for Cr(VI), and other coexisting anions and cations had no influence on the adsorption for Cr(VI) and Cu(II). The adsorption data for Cr(VI) and Cu(II) were nicely fit to the Langmuir adsorption equation and the pseudo-second-order model. As a multifunctional material, nano-Fe3O4 exhibited good adsorption performance for coexistent Cr(VI) and Cu(II) and could easily be separated and recovered under magnetic field.

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“…This organochlorine compounds has also been degraded by mesoporous graphitic carbon nitride in a study by Cui et al [106]. Vigneshwaran et al [107,108] degraded pesticides by using graphitic carbon nitride and also by using its nanocomposite with chitosan. This photocatalyst was able to degrade 85% of the toxic pesticide.…”

Section: G-c 3 N 4 -Based Photocatalysts For Pesticide Degradationmentioning

confidence: 99%

Recent Strategies for Environmental Remediation of Organochlorine Pesticides

2020

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The amount of organochlorine pesticides in soil and water continues to increase; their presence has surpassed maximum acceptable concentrations. Thus, the development of different removal strategies has stimulated a new research drive in environmental remediation. Different techniques such as adsorption, bioremediation, phytoremediation and ozonation have been explored. These techniques aim at either degrading or removal of the organochlorine pesticides from the environment but have different drawbacks. Heterogeneous photocatalysis is a relatively new technique that has become popular due to its ability to completely degrade different toxic pollutants—instead of transferring them from one medium to another. The process is driven by a renewable energy source, and semiconductor nanomaterials are used to construct the light energy harvesting assemblies due to their rich surface states, large surface areas and different morphologies compared to their corresponding bulk materials. These make it a green alternative that is cost-effective for organochlorine pesticides degradation. This has also opened up new ways to utilize semiconductors and solar energy for environmental remediation. Herein, the focus of this review is on environmental remediation of organochlorine pesticides, the different techniques of their removal from the environment, the advantages and disadvantages of the different techniques and the use of specific semiconductors as photocatalysts.

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Removal of chlorpyrifos, an insecticide using metal free heterogeneous graphitic carbon nitride (g-C3N4) incorporated chitosan as catalyst: Photocatalytic and adsorption studies

Cited by 104 publications

References 26 publications

Synergetic Subnano Ni‐ and Mn‐Oxo Clusters Anchored by Chitosan Oligomers on 2D g‐C₃N₄ Boost Photocatalytic CO₂ Reduction

Synergetic Subnano Ni‐ and Mn‐Oxo Clusters Anchored by Chitosan Oligomers on 2D g‐C₃N₄ Boost Photocatalytic CO₂ Reduction

Adsorption Properties of Magnetic Magnetite Nanoparticle for Coexistent Cr(VI) and Cu(II) in Mixed Solution

Recent Strategies for Environmental Remediation of Organochlorine Pesticides

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Removal of chlorpyrifos, an insecticide using metal free heterogeneous graphitic carbon nitride (g-C3N4) incorporated chitosan as catalyst: Photocatalytic and adsorption studies

Cited by 104 publications

References 26 publications

Synergetic Subnano Ni‐ and Mn‐Oxo Clusters Anchored by Chitosan Oligomers on 2D g‐C3N4 Boost Photocatalytic CO2 Reduction

Synergetic Subnano Ni‐ and Mn‐Oxo Clusters Anchored by Chitosan Oligomers on 2D g‐C3N4 Boost Photocatalytic CO2 Reduction

Adsorption Properties of Magnetic Magnetite Nanoparticle for Coexistent Cr(VI) and Cu(II) in Mixed Solution

Recent Strategies for Environmental Remediation of Organochlorine Pesticides

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Synergetic Subnano Ni‐ and Mn‐Oxo Clusters Anchored by Chitosan Oligomers on 2D g‐C₃N₄ Boost Photocatalytic CO₂ Reduction

Synergetic Subnano Ni‐ and Mn‐Oxo Clusters Anchored by Chitosan Oligomers on 2D g‐C₃N₄ Boost Photocatalytic CO₂ Reduction