Enhanced Adsorption and Photocatalytic Activities of Co-Doped TiO2 Immobilized on Silica for Paraquat

Nghĩa, Nguyễn Mạnh; Negishi, Nobuaki; Huệ, Nguyễn Thị

doi:10.1007/s11664-017-5838-5

Cited by 11 publications

(2 citation statements)

References 41 publications

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“…This indicates that the samples belong to mesoporous materials. [ 27 ] The pore diameter of supported TiO 2 /silica gel calculated by the BJH method pertains to the mesoporous range in Figure 2B. Besides, the textural properties of relevant catalysts are shown in Table 4.…”

Section: Resultsmentioning

confidence: 99%

Supported TiO₂/silica gel as an efficient and inexpensive catalyst for nonsolvent liquid‐phase oxidation of cyclohexylamine to cyclohexanone oxime

Liu

Ai-yang

et al. 2022

Can J Chem Eng

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A benign approach is proposed for the highly efficient synthesis of cyclohexanone oxime through nonsolvent liquid-phase oxidation of cyclohexylamine with dioxygen over supported TiO 2 /silica gel. The as-prepared catalyst was characterized by Brunauer-Emmett-Teller (BET), Fourier-transform infrared spectroscopy (FT-IR), scanning electron microscope (SEM), X-ray photoelectron spectroscopy (XPS), and X-ray powder diffraction (XRD) analyses. The results indicate that titanium active sites could be grafted on silica gel supports as catalytic centres. Various parameters such as reaction time and reaction temperature were systematically optimized; the results showed that supported 20%TiO 2 /silica gel exhibited the best catalytic effect with 63.2% of amine conversion and 86.3% of selectivity to CHO. A possible pathway is proposed for cyclohexylamine oxidation over supported TiO 2 /silica gel. The method developed in this study using dioxygen as the oxidant and inexpensive TiO 2 /silica gel as an efficient catalyst has incredible industrial application potential for green synthesis of cyclohexanone oxime.

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Section: Resultsmentioning

confidence: 99%

Supported TiO₂/silica gel as an efficient and inexpensive catalyst for nonsolvent liquid‐phase oxidation of cyclohexylamine to cyclohexanone oxime

Liu

Ai-yang

et al. 2022

Can J Chem Eng

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“…The TiO 2 /RHB composites were synthesized using a modified sol-gel method [17,18]. The proportions of titanium tetraisopropoxide (Ti[OCH(CH 3 ) 2 ] 4 , TTIP), diethanolamine (DEA) and ethanol (EtOH) by molar ratio are 1, 1 and 30, respectively.…”

Section: Tio 2 Coated Biochar Preparationmentioning

confidence: 99%

On the Degradation of Glyphosate by Photocatalysis Using TiO2/Biochar Composite Obtained from the Pyrolysis of Rice Husk

Nguyen

et al. 2021

Water

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In this study, titanium dioxide (TiO2) nanoparticles are immobilized onto rice husk biochar (RHB), as a porous support, for the photodegradation of glyphosate under UV light irradiation. The TiO2/RHB composites are prepared by pyrolysis and the sol-gel method. The SEM, XRD, EDX, and FT-IR results confirm the graphene structure of RHB and the formation of 10.61 nm TiO2 nanoparticles on the catalyst support. The effects of operating conditions, including catalyst dosage (3 g L−1, 5 g L−1, 10 g L−1, and 20 g L−1) and different illumination conditions (9 W lamp, 2 × 9 W lamps), on the removal of glyphosate from aqueous solutions were investigated. The photodegradation efficiency of 15 mg L−1 of commercial glyphosate was up to 99% after 5 h of irradiation at pH 3.0, with a TiO2/RHB dosage of 10 g L−1. However, the mineralization efficiency under this condition was lower than the decomposition efficiency of glyphosate, proving the partial degradation of glyphosate into AMPA and other metabolites after 5 h of reaction.

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Interaction of pesticides with natural and synthetic solids. Evaluation in dynamic and equilibrium conditions

Otalvaro

Brigante

2017

Environ Sci Pollut Res

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Interactions between pesticides (paraquat, glyphosate, 2,4-D, atrazine, and metsulfuron methyl) and soil organic and inorganic components have been studied in batch experiments by performing adsorption, dissolution, and chemical and photochemical degradation under different conditions. The obtained results confirm that the affinity of a pesticide to the solid surface depends on the nature of both and shows that each reactant strongly affects the mobility of the other one, e.g., anionic pesticides promote the dissolution of the solid humic acid but if this last is retained into the inorganic matrix enhances the adsorption of a cationic pesticide. Adsorption also seems to protect the bonded specie to be chemical degraded, such as shown in two pesticide/clay systems at constant pH. The use of mesoporous silicas could result in a good alternative for pesticide remediation. In fact, the solid shows high adsorption capacity towards paraquat and its modification with TiO nanoparticles increases not only the pesticide adsorption but also seems to catalyze its degradation under UV light to less-toxic metabolites. UV-VIS spectroscopy was relevant and novel in such sense. Electrostatic interactions, hydrogen and coordinative bonds formations, surface complexations and hydrophobic associations play a key role in the fate of mentioned pesticides on soil and ground/surface water environments.

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Enhanced Adsorption and Photocatalytic Activities of Co-Doped TiO2 Immobilized on Silica for Paraquat

Cited by 11 publications

References 41 publications

Supported TiO₂/silica gel as an efficient and inexpensive catalyst for nonsolvent liquid‐phase oxidation of cyclohexylamine to cyclohexanone oxime

Supported TiO₂/silica gel as an efficient and inexpensive catalyst for nonsolvent liquid‐phase oxidation of cyclohexylamine to cyclohexanone oxime

On the Degradation of Glyphosate by Photocatalysis Using TiO2/Biochar Composite Obtained from the Pyrolysis of Rice Husk

Interaction of pesticides with natural and synthetic solids. Evaluation in dynamic and equilibrium conditions

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Enhanced Adsorption and Photocatalytic Activities of Co-Doped TiO2 Immobilized on Silica for Paraquat

Cited by 11 publications

References 41 publications

Supported TiO2/silica gel as an efficient and inexpensive catalyst for nonsolvent liquid‐phase oxidation of cyclohexylamine to cyclohexanone oxime

Supported TiO2/silica gel as an efficient and inexpensive catalyst for nonsolvent liquid‐phase oxidation of cyclohexylamine to cyclohexanone oxime

On the Degradation of Glyphosate by Photocatalysis Using TiO2/Biochar Composite Obtained from the Pyrolysis of Rice Husk

Interaction of pesticides with natural and synthetic solids. Evaluation in dynamic and equilibrium conditions

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Product

Resources

About

Supported TiO₂/silica gel as an efficient and inexpensive catalyst for nonsolvent liquid‐phase oxidation of cyclohexylamine to cyclohexanone oxime

Supported TiO₂/silica gel as an efficient and inexpensive catalyst for nonsolvent liquid‐phase oxidation of cyclohexylamine to cyclohexanone oxime