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Jaafar SS, Faeq RI, Naji AM, Nief OA, Mohammed MKA. Addition of silver nanoparticles to the zinc ferrite/polyaniline composition for boosting its visible photocatalytic degradation. RSC Adv 2024; 14:26066-26076. [PMID: 39161436 PMCID: PMC11331758 DOI: 10.1039/d4ra05096g] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/14/2024] [Accepted: 08/14/2024] [Indexed: 08/21/2024] Open
Abstract
Enhancing the photocatalytic activity of ZnFe2O4 with a good energy band gap to degrade industrial waste under sunlight illumination can help to develop green environments. Here, to improve the photocatalytic efficiency of ZnFe2O4 ferrites, they were merged with polyaniline (PAni) and silver (Ag) nanoparticles to synthesize Ag@ZnFe2O4-PAni plasmonic nanostructures. The as-synthesized nanostructures were characterized using a series of advanced characterization techniques to confirm successful formation and investigate photocatalytic improvement origins. It was found that incorporating Ag NPs along with the PAni to ZnFe2O4 increases its absorption power and red-shifts its energy band gap, which increases the electron-hole production rate by exposure to light in ZnFe2O4. Contribution of the surface plasmon resonance effect of Ag NPs and conjugated double bonds of PAni to charge transfer mechanisms in Ag@ZnFe2O4-PAni material increased charge separation during photocatalytic process, boosting the photodegradation performance of ZnFe2O4.
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Affiliation(s)
- Safanah Sahib Jaafar
- Department of Chemistry, College of Science, Mustansiriyah University P. O. BOX 14132 Baghdad Iraq
| | - Rana Ismael Faeq
- Department of Chemistry, College of Science, Mustansiriyah University P. O. BOX 14132 Baghdad Iraq
| | - Amel Muhson Naji
- Department of Optics Techniques, Dijlah University College Al-Masafi Street Baghdad 00964 Iraq
| | - Olfat A Nief
- Department of Chemistry, College of Science, Mustansiriyah University P. O. BOX 14132 Baghdad Iraq
| | - Mustafa K A Mohammed
- College of Remote Sensing and Geophysics, Al-Karkh University of Science Baghdad 10011 Iraq
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Das A, Liu D, Wu Y, Abzakh BA, R M, M P, Kazakova EA, Vasenko AS, Prezhdo OV. Origin of the Improved Photoelectrochemical and Photocatalytic Activity in a ZnO-TiO 2 Nanohybrid Revealed by Experimental and Density Functional Theory Studies. J Phys Chem Lett 2024; 15:7524-7532. [PMID: 39023018 DOI: 10.1021/acs.jpclett.4c01641] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 07/20/2024]
Abstract
Heterojunctions of metal oxides have attracted a great deal of attention as photo (electro) catalysts owing to their excellent photoactivity. While multiple fundamental studies have been dedicated to heteroaggregation, self-assembly of oppositely charged particles to obtain heterojunctions for energy applications has been underexplored. Herein, we report the synthesis of ZnO-TiO2 heterojunctions using the electrostatic self-assembly approach. The synthesized ZnO-TiO2 heterojunctions were characterized by using multiple experimental techniques. Density functional theory calculations were conducted to establish the heterojunction formation mechanism and electronic properties. The ZnO-TiO2 nanohybrid was tested for the photodegradation of rhodamine B dye and water splitting applications. The photocatalytic performance of the ZnO-TiO2 nanohybrid is 3.5 times higher than that of bare ZnO. In addition, the heterostructure exhibited an excellent photocurrent density of 2.4 mA cm-2 at a low onset potential during photoelectrochemical oxygen evolution. The performance improvements are attributed to the formation of the type II heterojunction between ZnO and TiO2, which suppresses carrier recombination and enhances carrier transport, boosting the catalytic activity.
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Affiliation(s)
- Abinash Das
- PSG Institute of Advanced Studies, Coimbatore 641004, Tamil Nadu, India
| | | | - Yifan Wu
- Department of Chemistry, University of Southern California, Los Angeles, California 90089, United States
| | | | - Madhumitha R
- PSG Institute of Advanced Studies, Coimbatore 641004, Tamil Nadu, India
| | - Preethi M
- PSG Institute of Advanced Studies, Coimbatore 641004, Tamil Nadu, India
| | - Elena A Kazakova
- Department of Biochemistry, Sechenov First Moscow State Medical University, 119991 Moscow, Russia
| | - Andrey S Vasenko
- HSE University, 101000 Moscow, Russia
- Donostia International Physics Center (DIPC), 20018 San Sebastián-Donostia, Euskadi, Spain
| | - Oleg V Prezhdo
- Department of Chemistry, University of Southern California, Los Angeles, California 90089, United States
- Department of Physics & Astronomy, University of Southern California, Los Angeles, California 90089, United States
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David JJ, Stephen AMM, Kavitha S, Krishnan SK, Mariappan S, Sebastian SL, Palanichamy J, Kalivel P, Sathishkumar P. Investigating the efficiency of electrocoagulation using similar/dissimilar electrodes for the detoxification of Coralene Rubine dye: a cost effective approach. ENVIRONMENTAL GEOCHEMISTRY AND HEALTH 2024; 46:322. [PMID: 39012612 DOI: 10.1007/s10653-024-02096-y] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/15/2024] [Accepted: 06/24/2024] [Indexed: 07/17/2024]
Abstract
Efficient treatment of textile dyeing wastewater can be achieved through electrocoagulation (EC) with minimal sludge production; however, the selection of the appropriate electrode is essential in lowering overall costs. Also, the reuse of the treated aqueous azo dye solution from this process has not been explored in detail. With these objectives, this study aims to treat synthetic azo dye solutions and achieve high colour removal efficiency (CRE%) using similar (Ti-Ti) and dissimilar (Ti-Cu) metal electrodes through EC with an attempt to reduce the cost. The aqueous Coralene Rubine GFL azo dye was used to examine the efficiency and cost of the EC process. X-Ray Photoelectron Spectroscopy was used to study the EC mechanism, while High Performance Liquid Chromatography was used to analyse the degradation of the dye and the formation of intermediate compounds. The concentration of metal ions in the treated dye solution was quantified using Inductively Coupled Plasma Optical Emission Spectroscopy (ICP-OES), with Ti-Ti treated solution having 14.20 mg/L concentration of Ti and Ti-Cu treated solution having 0.078 mg/L of Ti and 0.001 mg/L of Cu, respectively. Colour removal efficiency of 99.49% was obtained for both electrode sets, with a lower operating time and voltage for dissimilar metal combination. Ecotoxicity studies showed negligible toxicity of Ti-Cu treated dye samples compared to untreated solutions. Survival rate, protein estimation, and catalase activity was used to validate the treatment method's efficacy. The study found that the dissimilar electrode material exhibited reduced toxicity due to the presence of heavy metals below the permissible limit.
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Affiliation(s)
- Jovitha Jane David
- Department of Physical Sciences, Karunya Institute of Technology and Sciences, Coimbatore, Tamil Nadu, 641114, India
| | - Asath Murphy Maria Stephen
- Department of Physical Sciences, Karunya Institute of Technology and Sciences, Coimbatore, Tamil Nadu, 641114, India
| | - Subbiah Kavitha
- Department of Biotechnology, Karunya Institute of Technology and Sciences,, Coimbatore, Tamil Nadu, 641114, India
| | - Suresh Kumar Krishnan
- Department of Biotechnology, Karunya Institute of Technology and Sciences,, Coimbatore, Tamil Nadu, 641114, India
| | - Santhiya Mariappan
- Department of Biotechnology, Karunya Institute of Technology and Sciences,, Coimbatore, Tamil Nadu, 641114, India
| | - Sahaya Leenus Sebastian
- Department of Physical Sciences, Karunya Institute of Technology and Sciences, Coimbatore, Tamil Nadu, 641114, India
- Department of Chemistry, Jayaraj Annapackiam College for Women (Autonomous), Periyakulam, 625601, India
| | - Jegathambal Palanichamy
- Water Institute, Karunya Institute of Technology and Sciences, Coimbatore, Tamil Nadu, 641114, India
| | - Parameswari Kalivel
- Department of Physical Sciences, Karunya Institute of Technology and Sciences, Coimbatore, Tamil Nadu, 641114, India.
| | - Palanivel Sathishkumar
- Green Lab, Department of Prosthodontics, Saveetha Dental College and Hospital, SIMATS, Saveetha University, Chennai, 600 077, India.
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Khaleeq A, Tariq SR, Chotana GA. Fabrication of samarium doped MOF-808 as an efficient photocatalyst for the removal of the drug cefaclor from water. RSC Adv 2024; 14:10736-10748. [PMID: 38572340 PMCID: PMC10988361 DOI: 10.1039/d4ra00914b] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/04/2024] [Accepted: 03/23/2024] [Indexed: 04/05/2024] Open
Abstract
MOFs are emerging photocatalysts designed by tuning organic ligands and metal centers for optimal efficiency. In this study, a samarium decorated MOF-808(Ce) metal organic framework was fabricated by facile hydrothermal synthesis. The synthesized samarium decorated MOF-808(Ce) was characterized by using analytical techniques such as SEM, EDX, XRD and TGA to study its morphological, thermal and structural properties. SEM images showed that MOF-808(Ce) comprised of truncated octahedrons. The morphology of the material was changed upon Sm incorporation. Sm/MOF-808(Ce) exhibited better UV-vis light absorption properties than MOF-808(Ce) as evidenced by its slightly higher band gap value. This material was exploited for the degradation of the drug cefaclor from water. Cefaclor removal followed double a first order in parallel model (DFOP). Under UV light, 97.7% of the cefaclor was removed in only 20 minutes and after 60 minutes this removal efficiency was increased to 99.25%. These features exhibited that samarium decorated MOF has immense potential for the photocatalytic degradation of cefaclor as it generates e- and h+ to enhance the photocatalytic efficiency and it is a promising candidate to treat wastewater without formation of harmful byproducts.
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Affiliation(s)
- Anum Khaleeq
- Department of Chemistry, Lahore College for Women University Jail Road Lahore 54000 Pakistan
| | - Saadia Rashid Tariq
- Department of Chemistry, Lahore College for Women University Jail Road Lahore 54000 Pakistan
| | - Ghayoor Abbas Chotana
- Department of Chemistry and Chemical Engineering, Syed Babar Ali School of Science & Engineering (SBASSE), Lahore University of Management Sciences (LUMS) Lahore 54792 Pakistan
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Ali F, Nazir A, Sandhu ZA, Mehmood A, Raza MA, Hamayun M, Al-Sehemi AG. In situ fabrication of lanthanum-doped nickel oxide nanostructures using sol-gel for the degradation of rhodamine B. RSC Adv 2024; 14:4406-4415. [PMID: 38312718 PMCID: PMC10835344 DOI: 10.1039/d3ra08311j] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/05/2023] [Accepted: 01/17/2024] [Indexed: 02/06/2024] Open
Abstract
Nanoscale science represents a thriving field of research for environmental applications within materials science. This study focuses on the fabrication of pure and La-doped nickel oxide (NiO) nanostructures with varying concentrations (1.0, 2.0, 3.0, and 4.0 wt%) of lanthanum using a facile sol-gel technique. This study explores the structural, morphological, chemical composition, and optical characteristics of the resulting pure and La-doped NiO nanostructures. Techniques such as X-ray diffraction (XRD), scanning electron microscopy (SEM), energy-dispersive X-ray (EDX) spectroscopy, UV-visible spectroscopy, and photoluminescence (PL) spectroscopy were used for material analysis. The observed trend in the energy band gap (Eg) values demonstrates a continuous decrease up to a La-doping concentration of 3 wt% in NiO. However, after this concentration (at 4.0 wt%), there is a noticeable increase in the energy band gap. At lower La-doping concentrations (up to 3 wt%), the incorporation of La ions into the NiO lattice may result in the formation of defects and oxygen vacancies. The presence of these imperfections may lead to new energy levels into the band gap, resulting in partial filling and a subsequent reduction in the band gap. Beyond a specific doping concentration (e.g., 3 wt%), excess La atoms may aggregate or cluster inside the NiO lattice. This agglomeration may cause structural distortions, strain, and disturbances in the crystal lattice, resulting in an increase in the band gap. The 3 wt% La-doped NiO sample demonstrated a notable 84% degradation efficiency of the synthesized nanomaterials coupled with its inherent stability, highlighting its dual attributes of effective pollutant removal and sustained performance. Furthermore, the cyclic stability of the optimized nanostructure is anticipated to be ∼77.42% after six cycles, suggesting promising future applications in photocatalysis.
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Affiliation(s)
- Furqan Ali
- Department of Physics, Faculty of Science, University of Sialkot Sialkot 51310 Pakistan
| | - Asma Nazir
- Department of Physics, Faculty of Science, University of Sialkot Sialkot 51310 Pakistan
| | - Zeshan Ali Sandhu
- Department of Chemistry, Faculty of Science, University of Gujrat, Hafiz Hayat Campus Gujrat 50700 Pakistan
| | - Arslan Mehmood
- Department of Chemistry, Faculty of Science, University of Gujrat, Hafiz Hayat Campus Gujrat 50700 Pakistan
| | - Muhammad Asam Raza
- Department of Chemistry, Faculty of Science, University of Gujrat, Hafiz Hayat Campus Gujrat 50700 Pakistan
| | - Muhammad Hamayun
- Department of Chemistry, Faculty of Science, University of Gujrat, Hafiz Hayat Campus Gujrat 50700 Pakistan
| | - Abdullah G Al-Sehemi
- Research Center for Advanced Materials Science (RCAMS), King Khalid University Abha 61413 Saudi Arabia
- Department of Chemistry, College of Science, King Khalid University Abha 61413 Saudi Arabia
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