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Shahram Ghasemi

Shahram Ghasemi

Academic rank: Associate Professor
ORCID:
Education: PhD.
ScopusId:
Faculty: Faculty of Chemistry
Address: Dept. of Applied Chemistry, Faculty of Chemistry, University of Mazandaran
Phone: 01135302388

Research

Title
Saffron derived carbon quantum dot/N-doped ZnO/fulvic acid nanocomposite for sonocatalytic degradation of methylene blue
Type
JournalPaper
Keywords
Saffron, Green synthesis, Carbon quantum dots, Fulvic acid Zinc oxide, Degradation, Methylene blue
Year
2021
Journal SYNTHETIC METALS
DOI
Researchers Monire Moalem-Benhangi ، nayyereh ghaeni ، Shahram Ghasemi

Abstract

through hydrothermal method for catalytic degradation of methylene blue (MB). The CQD nanoparticles were synthesized from dried stigma of saffron. FT-IR, XRD, TGA, BET, FESEM-EDS, and TEM were conducted to characterize the prepared nanocomposite. A sonocatalytic approach using probe-type ultrasonic irradiation (20 kHz, 100 W) was applied to treat polluted water with MB. The synergetic capability of ultrasonic irradiation and catalytic activity of N-ZnO/FA/CQD nanocomposite produce reactive species for better degradation of MB in aqueous environments. Based on the results, the optimized values for main parameters in pH of 8 were determined as N-ZnO/FA/CQD dosage of 1.5 g/L, MB primary concentration of 20 mg/L, time = 50 min, and [H2O2] = 5 mM. The adsorption behavior of MB onto N-ZnO/FA/CQD was demonstrated through the pseudosecond- order kinetic model and can be fitted with Langmuir isotherm model. The N-ZnO/FA/CQD nanocomposite showed the enhanced sonocatalytic activity with degradation efficiency of 94% for MB dye. The NZnO/ FA/CQD nanocomposite might be regarded as an efficient catalyst for degredation of organic dyes in wastewater.