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Your search keyword '"Rahiman, M. Kalil"' showing total 2 results
Start Over Author "Rahiman, M. Kalil" Topic visible spectra
2 results on '"Rahiman, M. Kalil"'

1. Enhanced photo-Fenton assisted photocatalytic degradation of atenolol using a novel rGO embedded double Z-scheme nano-heterojunction: Mechanism, kinetics and toxicity studies.

Author

Rajeshwari, M. Raaja, Syed, Asad, Bahkali, Ali H., Elgorban, Abdallah M., Rahiman, M. Kalil, Varma, Rajender S., and Khan, S. Sudheer

Subjects
PHOTODEGRADATION, ATENOLOL, ONIONS, VISIBLE spectra, CHARGE carriers, HETEROGENEOUS catalysts
Abstract

[Display omitted] • A novel rGO embedded double Z-scheme photocatalyst CuFe 2 O 4 /CdS/Bi 2 S 3 QDs was fabricated. • Superior degradation of atenolol through enhanced surface oxygen vacancies and photo-Fenton reaction. • Heterojunction formation resulted in mitigation of charge carrier recombination. • The formation of h+ and OH served as the major radicals facilitating the degradation of atenolol. • The catalyst was highly stable, reusable, non-corrosive, non-toxic and easily recoverable. In this work, rGO-based ternary dual Z-scheme heterojunction (rGO/CuFe 2 O 4 /CdS/Bi 2 S 3 QDs) was formulated for the effective photo-Fenton assisted photocatalytic degradation of a β-blocker, atenolol. The catalyst was synthesised via a simple co-precipitation/hydrothermal method and was characterized using XRD, XPS, FT-IR, SEM, TEM, PL, EIS, ESR, Raman and DRS. It exhibited about 76.5% degradation of atenolol in 360 min under visible light irradiation with a rate constant of 0.004 min−1 wherein the mechanism of enhanced activity was attributed to the formation of OH, h+ and photo-Fenton reaction; a possible mechanism was drafted. The intermediates were determined using GC–MS analysis delineating a plausible degradation pathway, the mineralization of atenolol being confirmed by TOC analysis. The catalyst was reusable and highly stable up to six cycles of degradation, as affirmed via XRD and XPS analysis. Further, the toxicity of the catalyst has been studied using the root cells of Allium cepa , and the degraded product and intermediates were assessed deploying ECOSAR software. Thus, the proposed work has potential which can be implemented in future for the large-scale purification of wastewater. [ABSTRACT FROM AUTHOR]

Published
2022
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2. Tandem CQDs loaded triple metal oxide interface-reinforced built-in electric field for a wide-spectral-responsive photocatalyst.

Author

Okla, Mohammad K., Rahiman, M. Kalil, Abdel-Maksoud, Mostafa A., Alaraidh, Ibrahim A., Alatar, Abdulrahman A., Al-amri, Saud S., AbdElgawad, Hamada, Sillanpää, Mika, and Khan, S. Sudheer

Subjects
*ELECTRIC fields, *METALLIC oxides, *QUANTUM dots, *VISIBLE spectra, *CHARGE carriers, *METALLIC composites, *IRRADIATION
Abstract

Focusing at efficient Cefixime (CEFX) removal, a delicate ultrathin-Bi 2 WO 6 (UBWO) stacked quasi-CoFe 2 O 4 binanosheets (BT) were meticulously designed and integrated with spherical MnWO 4 (MWO) and carbon quantum dots (CQDs), forming a n-p-n CQDs@MWO/CFO:UBWO nanohybrid. XRD, XPS, TEM and other systematic analysis demonstrated the vertically aligned layer by layer assembly of UBWO:CFO BT, and a shift in the highly exposed (211) facet of UBWO after nanohybrid formation as well as large surface area (323.33 m2/g) was achieved. UV–vis DRS, PL and EIS proved high separation efficiency, prolonged life time and photogeneration of more charge carriers with absorption of full light spectrum. As expected, the optimized 5 %CQDs@0.25MWO/0.1CFO:UBWO nanohybrid displayed excellent visible light absorption and outstanding CEFX photodegradation whose kinetic constant were 21.11, 12.5, 8.82 folds higher than UBWO, CFO and MWO counterparts. This enhanced photodegradation performance ascribed to the dual strategy as follows: (i) Cascaded charge transfer with the Built-in electric field (BIEF) after n-p-n heterojunction, (ii) the upconverted PL and the electron reservoir properties of CQDs. Degradation efficiency maintained over six consecutive cycles affirming the superior recyclability of the photocatalyst. A possible degradation pathway was proposed based on GC-MS/MS analysis and the end products toxicity were systematically predicted using ECOSAR program. The toxicity of the end product was investigated against bacterial species. The proposed work provides a novel way for the fabrication of efficient photocatalyst with excellent practical applicability. [Display omitted] • UBWO/CFO binanosheets interfaced MWO synergistic with CQDs fabricated via hydrothermal method. • Optimized 5 %CQDs@ 0.25MWO/0.10CFO:UBWO showed high photodegradation efficiency. • Excellent recyclability demonstrated by the cyclic degradation experiments. • •OH and O 2 •- radicals played major role in the photodegradation process. • Non-toxic nature of end product affirmed by ECOSAR and bacterial studies. [ABSTRACT FROM AUTHOR]

Published
2023
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