Browsing by Author "Habibi, Meysam"

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Binary Ceo2-x/Ag4v2o7 Photocatalysts: Impressive Performances in Detoxification of Organic and Inorganic Pollutants
(Elsevier, 2024) Zohari Moafi, Marzieh; Habibi Yangjeh, Aziz; Habibi, Meysam; Akinay, Yuksel
Considering the sever threat of dangerous pollutants to unbalance the environment, it is necessary to develop an efficient and appropriate method to control and reduce environmental issues. We combined CeO2-x with Ag4V2O7 to fabricate binary novel CeO2-x/Ag4V2O7 photocatalysts through a facile hydrothermal route. Among the CeO2- x/Ag4V2O7 photocatalysts, the nanocomposite with 20 % of Ag4V2O7 was more effective than CeO2-x nanoparticles in detoxification of tetracycline (9.48 times), azithromycin (3.80 times), methylene blue (3.42 times), Fuchsine (3.58 times), and Cr (IV) (1.34-times) solutions under visible light. The charges segregation and transfer efficacious studies exhibited effective collaborations of CeO2-x and Ag4V2O7 nanoparticles in the successful reaching of the produced electron/hole pairs to the catalyst surface, and an s-scheme pathway was suggested for the charge segregation between CeO2-x and Ag4V2O7 nanoparticles. Moreover, the biocompatibility and reusability of the CeO2-x/Ag4V2O7 (20 %) photocatalyst were tested respectively in the growth of lentil seeds and four repeated runs.
Facile Synthesis of Zno/Ceo2 Photocatalysts Sensitive To Visible Light With Tandem N-N Heterojunctions and Improved Performance Towards Tetracycline and Dye Effluent Removals
(Elsevier Science Sa, 2024) Andish-Lifshagerd, Fatemeh; Habibi-Yangjeh, Aziz; Habibi, Meysam; Akinay, Yuksel
Nowadays, ZnO-based photocatalysts are very effective in wastewater treatment. Herein, CeO2 and CeFeO3 nanoparticles were anchored on ZnO through a coprecipitation-calcination procedure. The fabricated materials were studied by TEM, EDX, SEM, XRD, HRTEM, XPS, PL, UV-vis DRS, BET, BJH, FTIR, and EIS analyses. The optimized ZnO/CeO2/CeFeO3 nanocomposite showed significant performance for the degradation of tetracycline hydrochloride, amoxicillin, Congo red, and Fuchsine with rate constants of 313 x 10-4 , 104 x 10-4 , 204 x 10-4 , and 163 x 10-4 min-1 , which was 24.1, 1.44, 20.4, and 2.03 times higher than ZnO, respectively. Moreover, the reduction of Cr(VI) to Cr(III) (189 x 10-4 min-1) over the ZnO/CeO2/CeFeO3 photocatalyst was almost 2.12 times faster than the ZnO photocatalyst (88.7 x 10-4 min-1). Besides, the photocatalyst presented remarkable stability after four cycles in the photodegradation of tetracycline hydrochloride contaminant. The purified solution over the photocatalyst was also tested in terms of biocompatibility. The optical, electrochemical, and textural analyses attributed the enhanced activity to the effective production and separation of charge carriers, facile transfer of electron/hole pairs, and promoted textural characteristics. The enhanced charge segregation was ascribed to the developing tandem n-n heterojunctions among ZnO, CeO2 , and CeFeO3.