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9. Solid-phase microextraction

Author

Shahvar, Ali, primary, Naccarato, Attilio, additional, Saraji, Mohammad, additional, Lucena, Rafael, additional, and Cárdenas, Soledad, additional

Published
2021
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10. List of contributors

Author

Alshana, Usama, primary, Benedé, Juan L., additional, Bitas, Dimitro, additional, Caballero-Casero, Noelia, additional, Carasek, Eduardo, additional, Cárdenas, Soledad, additional, Carrasco-Correa, Enrique Javier, additional, Chisvert, Alberto, additional, Del Carmen Díaz-Liñán, María, additional, Ding, Jun, additional, Emmons, Ronald V., additional, Feng, Yuqi, additional, Fresco-Cala, Beatriz, additional, Gionfriddo, Emanuela, additional, Gómez Ríos, G., additional, González-Curbelo, Miguel Ángel, additional, González-Sálamo, Javier, additional, Hernández-Borges, Javier, additional, Herrero-Martínez, José Manuel, additional, Jiménez-Skrzypek, Gabriel, additional, Kabir, Abuzar, additional, Lasarte-Aragonés, Guillermo, additional, Llaver, Mauricio, additional, López-Lorente, Ángela Inmaculada, additional, Lopez-Ruiz, Inmaculada, additional, Lucena, Rafael, additional, Mafra, Gabriela, additional, Merib, Josias, additional, Millán-Santiago, Jaime, additional, Miró, M., additional, Naccarato, Attilio, additional, Olomukoro, Aghogho A., additional, Ortega-Zamora, Cecilia, additional, Pacheco-Fernández, Idaira, additional, Pedersen-Bjergaard, Stig, additional, Peng, Xitian, additional, Pino, Verónica, additional, Priego-Capote, Feliciano, additional, Psillakis, Elefteria, additional, Rubio, Soledad, additional, Samanidou, Victoria, additional, Saraji, Mohammad, additional, Shahvar, Ali, additional, Soylak, Mustafa, additional, Vergara-Barberán, María, additional, and Wuilloud, Rodolfo G., additional

Published
2021
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17. Carrageenan-based green heterogeneous catalyst for production of 5-hydroxymethylfurfural by dehydrating fructose and glucose.

Author

Rezaie, Mahsa, Dinari, Mohammad, Chermahini, Alireza Najafi, Saraji, Mohammad, and Shahvar, Ali

Abstract

In this research, iota carrageenan (ιC) was cross-linked with N, N-methylene bisacrylamide (MBA) to form ιC-g-MBA, as a new green solid acid catalyst. The catalyst structure and morphplogy were explored using FT-IR, TGA, BET, FESEM, and XRD techniques. It was used in 5-hydroxymethylfurfural (5-HMF) production by fructose and glucose dehydration. Factors contributing to reaction optimization, such as the solvent, temperature, catalyst amount, and reaction duration, were explored. The optimal conditions of the reaction for fructose dehydration were 160 °C and 1 h as the reaction temperature and time, respectively. It was established that the conversion of fructose and HMF yield was 95.5% and 93.1%, respectively. Similarly, the optimal temperature and time for the reaction of glucose dehydration were 160 °C and 2 h, respectively. Moreover, the HMF yield and glucose conversions were 46% and 93%. Reusability of the catalyst was analyzed, whereupon the catalyst proved capable of being reemployed after four runs. [ABSTRACT FROM AUTHOR]

Published
2023
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29. Au-Pd@g-C3N4as an Efficient Photocatalyst for Visible-Light Oxidation of Benzene to Phenol: Experimental and Mechanistic Study

Author

Hosseini, Sayyed Mahdi, Ghiaci, Mehran, Kulinich, Sergei A., Wunderlich, Wilfried, Farrokhpour, Hossein, Saraji, Mohammad, and Shahvar, Ali

Abstract

In the present study, a mesoporous photocatalyst based on Au–Pd nanoparticles incorporated into g-C3N4was prepared by a coassembly method using melamine as the carbon and nitrogen source, polyvinyl pyrrolidone as the dispersing agent, and pulse laser ablation in liquid technique for preparing gold nanoparticles and subsequent decoration with Pd nanoparticles. At the final stage, Au–Pd/g-C3N4nano-photocatalyst was obtained via low-ramping pyrolysis in an argon atmosphere. The activity of the catalyst was related to its structure, which was characterized by high-resolution transmission electron microscopy, field-emission scanning electron microscopy, X-ray photoelectron spectroscopy, energy-dispersive X-ray spectroscopy, and Brunauer–Emmett–Teller analysis. The results demonstrated that the Au–Pd-containing catalyst exhibited superior performance compared to its counterparts containing monometallic nanoparticles. The influence of variables such as reaction temperature, time of irradiation, amount of hydrogen peroxide, and amount of metal nanoparticles was investigated. Under optimized conditions, the Au–Pd/g-C3N4photocatalyst showed benzene conversion of 26% at a phenol selectivity of 100%, giving no dihydroxylated byproducts. The catalyst was highly stable and recyclable, thus showing promise for the direct conversion of benzene to phenol. Time-dependent density functional theory (TD-DFT) calculations describe the activation of the oxidant by charge transferring from the metal clusters to the graphitized carbon nitride support and explain why the Au–Pd/g-C3N4composite (rather than Au/g-C3N4) has superior efficiency in promoting the benzene-to-phenol conversion. The same DFT calculations showed that the Pd/g-C3N4composite cannot catalyze the same processes.

Published
2018
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