In this work, Co-doped (CTN) and Fe/Co-doped (FCTN) TiO2 nanofilms were fabricated by solvothermal synthesis and subsequently binder-free electrophoretic deposition on Ti substrates. The approach yielded firmly immobilized catalysts without polymeric binders, facilitating mass transfer and straightforward recovery. XRD confirmed phase-pure anatase with no detectable secondary oxide phases, while SEM/EDX mapping showed continuous, well-adhered films and uniformly distributed dopants across the coated surface. UV-Vis DRS indicated band-gap narrowing and enhanced visible-light absorption, with the largest red shift for Fe/Co-doping. Under simultaneous visible irradiation and ultrasonication, FCTN degraded 94 % of amoxicillin within 60 min and followed second-order kinetics, markedly outperforming CTN. The higher activity is attributed to synergistic dual-metal effects that improve charge-carrier separation, enable efficient Fe3+/Fe2+ and Co3+/Co2+ redox cycling, and intensify reactive oxygen species generation under coupled light/ultrasound fields. The immobilized nanofilms retained their morphology and adhesion after reaction and maintained performance over multiple reuse cycles, demonstrating excellent stability. Practical applicability was probed in a high-ionic-strength real water matrix, where FCTN still achieved up to 69 % removal despite matrix scavenging and competitive adsorption. Overall, the scalable, binder-free FCTN is a durable sonophotocatalyst for visible-light treatment of antibiotic-contaminated waters. These findings highlight the potential of substrate-supported doped TiO2 nanofilms for low-sludge operation in advanced oxidation processes targeting emerging contaminants in complex wastewaters.

The development of efficient photocatalysts for environmental remediation, particularly for the degradation of organic pollutants, has gained significant attention in recent years. This study focuses on the synthesis, characterization, and electrophoretic deposition (EPD) of Fe-doped TiO2 nanoparticles, as well as their application in the sonophotocatalytic degradation of methylene blue (MB), a common organic dye pollutant. The incorporation of iron (Fe) into the TiO2 lattice was aimed at enhancing its photocatalytic activity under visible light by reducing the bandgap and minimizing electron-hole recombination. The synthesized nanoparticles were characterized using X-ray diffraction, scanning electron microscopy, energy dispersive X-ray analysis. The electrophoretic deposition technique was employed to create thin films of Fe-doped TiO2 on conductive substrates for practical applications. The sonophotocatalytic performance of the Fe-doped TiO2 nanoparticles was evaluated by monitoring the degradation of MB under visible light irradiation. The results demonstrated that Fe-doped TiO2 exhibited superior efficiency (92% degradation in 30 minutes), highlighting its potential for wastewater treatment and environmental cleanup. To complete the research, the reusability of the catalyst was also investigated.

In this study, Fe-doped TiO2 nanofilm was fabricated using a solvothermal method and subsequently applied to the substrate via an electrophoretic deposition (EPD) technique without requiring a binding agent. The aim of this research is to enhance the sonophotocatalytic performance of TiO2 by integrating iron impurities into the catalyst structure, thereby addressing the limitation of the catalyst's inactivity under visible light and tackling the issue of catalyst separation for reuse. This method guarantees that the nanofilm is deposited uniformly and under regulated conditions on the substrate. X-ray diffraction (XRD), Scanning electron microscopy (SEM), Energy dispersive X-ray (EDX) analysis, Fourier transform infrared spectroscopy (FTIR), and UV-Vis techniques were employed to characterize the synthesized nanofilms. The findings indicate that the resulting nanofilms were responsive to visible light and exhibited high efficiency in the degradation of amoxicillin (AMX). The sonophotocatalytic process eliminated approximately 90 % of the amoxicillin, while ultrasound alone could degrade 17 % and visible light alone could degrade about 39 %. It was calculated and noted that the combination of ultrasonic and visible light had a synergistic effect of roughly 70.7 %. The most notable discovery was that the nanofilm could degrade 83 % of AMX after four applications, demonstrating its reusability.

Zinc oxide nanostructures were synthesized using a thermal decomposition method and subsequently doped with Fe (III) in this study. Techniques such as X-ray diffraction, Field emission scanning electron microscopy, and Fourier transform infrared spectroscopy were used to investigate the structural and chemical composition of nanomaterials. Fe-doped ZnO was synthesized using a simple, low-cost planetary high-energy ball milling process. The sonophotocatalytic activity of Fe-doped ZnO under visible light and ultrasonic waves was then studied. Another aspect of this study is the utilization of visible light, which is far more accessible and cost-effective than UV light. Malachite green (MG) and phenol were applied as water-soluble contaminants. MG degraded about 87.65% after 1 h in the presence of a Fedoped ZnO catalyst under visible light and ultrasonic waves simultaneously. Phenol was degraded by approximately 64.50% under the same conditions. (c) 2024 Society of Powder Technology Japan Published by Elsevier B.V. All rights are reserved, including those for text and data mining, AI training, and similar technologies.

Nanoparticles deposited on a substrate could be an excellent candidate for environmental and catalytic applications. Herein, TiO2 nanoparticles were prepared by a solvothermal method and then electro-phoretically deposited on a substrate via an in-situ one-pot method. The developed process does not need a washing process (after synthesis), neither sintering nor organic binders (for deposition). Transmission electron microscopy (TEM), used to analyze the deposited nanofilm, confirms that the layer is crack-free and homogeneous. Then sonophotocatalytic performance of TiO2 nanofilm in the degradation of the organic pollutants (Methylene blue, phenazopyridine) was investigated, since the problem of filtration of the cat-alyst after the sonophotocatalysis process is eliminated. About 90 % of the organic pollutant was degraded by the sonophotocatalytic process, while the application of ultrasound alone is capable of degrading 14 %, and UV light alone is about 55 %. The synergic effect of ultrasound and UV light was calculated and reported about 59 %. The applicability of the optimized sonophotocalytic system was evaluated by decomposition of a commercial tablet (phenazopyridine), and the efficiency was 84 % in an hour. Most importantly, the reu-sability of the nanofilm was investigated, and after 4 uses, the nanofilm was able to degrade 84 % of organic pollutants. Owing to its excellent performance, the nanofilm prepared by EPD is suitable for a broad range of environmental and energy applications.(c) 2022 Elsevier B.V. All rights reserved.

Preparing the low-cost nanomaterials for electrocatalytic processes is still a big challenge. Mesoporous cobalt hydroxide and cobalt oxide nanoparticles were prepared through simple soft chemistry as high-performance materials for durable electrocatalyst for OER and supercapacitive applications. The synthesis method is used to prepare nanoring particles in neither emulsion nor template-directed method. The final nanoparticles display mesoporous hexagonal nanoring morphology. The physio-chemical properties of the as-synthesized nanoparticles were characterized by X-ray diffraction (XRD), transmission electron microscopy (TEM), and nitrogen adsorption-desorption techniques. The TEM characterizations prove that NPs retain the topotactical relationship in their structure during the conversion process. The BET measurements prove the mesoporous nature of the nanorings, having good specific surface area and pore volume. Finally, the electrochemical performance toward water splitting and supercapacitor applications were investigated by electrochemical impedance spectroscopy (EIS), linear sweep voltammetry (LSV), and cyclic voltammetry (CV) techniques. The Co3O4 NPs exhibits better catalytic properties than Co(OH)2 NPs when applied as electrocatalyst in an alkaline medium for water splitting and supercapacitor measurements. The enhanced electrocatalytic performance attributed to the mesoporous structure along with high pore volume, which provides more active boundary sites for the electrochemical process, resulted in the enhanced exchange of the intermediates and more efficient electron transfer. This synthetic methodology, with the advantages of inexpensive/non-complicated experimental setup and high electrochemical performance, could shed light on the development of non-expensive electrocatalysts for clean energy production and storage.

For most of the catalytic reactions dealing with noble metals, a replacement of pure noble metals with hybrid noble metal-nanomaterials or nanocomposites is a well-stablished strategy for reducing the cost of the catalytic process. The application of this strategy is challenging and of interest for the scientific community. In this context, we report the design of Pd-anchored mesoporous cobalt hydroxide nanoring composites which, used as catalysts, can efficiently catalyze Suzuki C-C coupling reactions with excellent activity, versatility and selectivity due to the strong synergetic effect standing from its structure and composition. Hybrid systems based on mesoporous Co(OH)(2) nanoparticles and Pd are able to reach up to 88% conversion of iodobenzene and 37% yield of the biphenyl product at 24 h. Additionally, the photocatalytic performance of the hybrid system has been investigated in selective oxidation of benzylalcohol and organic dye degradation. This nanostructured material was able to selectively photo-oxidize benzyl alcohol to benzaldehyde under LED light with moderate catalytic activity (turnover numbers and turnover frequencies were of 4.62 and 0.78 h(-1) respectively with 95% selectivity). In addition, the studied hybrid system was able to degrade methylene blue in water with good performance via a photocatalytic reaction by irradiation with UV light and LED light (the kinetic constant for a first order degradation was 1.03.10(-4) s(-1) and 1.24.10(-5) s(-1), respectively). Thus, our preliminary catalytic results show that these nanomaterials, based on Co(OH)(2) nanoparticles with low content of noble-metal, are promising candidates for their potential use in different industrial catalytic applications. (C) 2020 Elsevier B.V. All rights reserved.