by Jyoti Bhattacharjee  and Subhasis Roy

Received: 17 February 2024;  Published: 09 August 2024;  doi: 10.21926/cr.2403011

The evolution of nanomaterials has been critical in modifying materials at the nanoscale for specialized uses. Carbon nanotubes were initially viewed as promising for electronics, but their inability to discriminate between semiconducting and metallic phases led to the creation of quasi-two-dimensional (Q-2D) materials. Molybdenum nanoparticles are utilized as alloy additions in corrosive and high-vacuum environments. Their characteristics differ significantly from those of their bulk counterparts. This review anal [...]

by Mathivathani Kandiah  , Dharsha Bhaskaran  and Ominda Perera

Received: 29 April 2024;  Published: 22 July 2024;  doi: 10.21926/cr.2403010

Nanotechnology is a fast-rising market in catalytic research; however, the production of eco-friendly nanoparticles remains a significant challenge. In this study, silver nanoparticles (AgNPs) were synthesized from the agro-industrial waste of leaves of C. longa, C. aromatica, C. caesia, C. zedoaria, and C. amada at RT after 24 h, which was confirmed with UV-spectrophotometric evaluation between 320-520 nm. SEM revealed cubic and 30-50 nm AgNPs, while band-gap energy was presented as semi-conductors. Synthesized Ag [...]

by Mª Carmen Márquez

Received: 27 March 2024;  Published: 18 July 2024;  doi: 10.21926/cr.2403009

Lipase-catalyzed hydrolysis of olive oil has been studied in the absence of emulsifier. A simple mathematical model to predict the hydrolysis rate is derived from a proposed kinetic mechanism of the reaction. The hydrolytic reaction obeys Michaelis-Menten kinetics with a simultaneous second-order enzyme deactivation. The model predictions closely agree with the experimental results.

by Sergey Evstropiev  , Andrey Shelemanov  , Igor Bagrov  , Anna Karavaeva  , Kseniya Portnova  and Nikolay Nikonorov

Received: 06 April 2024;  Published: 03 July 2024;  doi: 10.21926/cr.2403008

Disperse porous Mn-doped ZnO-ZrO2 nanocomposites were prepared using the facile polymer-salt method. The effect of Mn content on the crystal structure, composite morphologies, their ability to photogenate the singlet oxygen, luminescence properties, and bactericidal activities were studied. The crystal structure and morphology of these materials were investigated using XRD and SEM analysis. It was found that obtained nanocomposites consist of small (~9 nm) hexagonal ZnO and fine ZrO2 crystals and the embedding of M [...]

by Luana Góes Soares  , Sandra Kunst  , Cláudia Trindade Oliveira  and Annelise Kopp Alves

Received: 04 February 2024;  Published: 01 July 2024;  doi: 10.21926/cr.2403007

Sustainability has driven the use of heterogeneous photocatalysis as one of the primary methods for environmental decontamination, reduction, degradation, remediation, or transformation of polluting chemical residues and purification treatment of effluents and wastewater. TiO2 is the most commonly used semiconductor in heterogeneous photocatalysis. It acquires relevance, as it has favorable properties, such as non-toxicity, stability in a wide range of pH, economic viability, etc., which encourage its application a [...]

by Charitha Thambiliyagodage  , Madara Jayanetti  , Geethma Ekanayake  , Amavin Mendis  , Heshan Liyanaarchchi  and Supuni Wijayawardana

Received: 10 April 2024;  Published: 13 June 2024;  doi: 10.21926/cr.2402006

Ilmenite is a mineral whose crystallinity can be altered by chemical treatment, producing TiO2 and iron and titanium-based metal nanocomposites, which are applicable mainly for photocatalysis. Porous and crystalline biomass-derived carbon materials include graphene oxide, reduced graphene oxide, graphitic carbon nitride, catalytically graphitized sucrose and chitosan, and activated carbon. Ilmenite-based metal oxides coupled with biomass-based carbon materials are effective in environmental remediation, especially [...]

by Tülin Avcı Hansu

Received: 25 December 2023;  Published: 15 May 2024;  doi: 10.21926/cr.2402005

In this study, by producing bifunctional material, hydrolysis, and supercapacitor applications were investigated. The carbon nanotube-supported Pt catalyst was prepared using the sodium borohydride (NaBH4) reduction. Surface characterization of the synthesized Pt/CNT catalyst was performed using scanning electron microscopy-energy dıstrıbutıon X-ray spectrometer (SEM-EDX), X-ray diffraction (XRD), and transmission electron microscopy (TEM). Hydrolysis experiments were performed after deciding on the appropriate ato [...]

by Vesna Nikolić

Received: 31 March 2024;  Published: 09 April 2024;  doi: 10.21926/cr.2402004

by Edmundo S. Valerio Neto  , Caio V.S. Almeida  , Giancarlo R. Salazar-Banda  and Katlin I.B. Eguiluz

Received: 24 November 2023;  Published: 11 March 2024;  doi: 10.21926/cr.2401003

In this study, we synthesized Pt-Rh nanowires (NWs) through chemical reduction of metallic precursors using formic acid at room temperature, excluding the use of surfactants, templates, or stabilizing agents. These NWs were supported on two substrates: carbon (Vulcan XC-72R) and carbon modified with tin oxide (SnO2) via the sol-gel method (10 wt.% SnO2). We explored the electroactivity of Pt/SnO2/C, Pt-Rh/C, Pt-Rh/SnO2(commercial)/C (commercial SnO2), and Pt-Rh/SnO2/C NWs toward electrochemical oxidation of ethanol [...]

by Antusia dos Santos Barbosa  and Meiry Gláucia Freire Rodrigues

Received: 24 October 2023;  Published: 28 January 2024;  doi: 10.21926/cr.2401002

The research describes a sustainable approach for the synthesis of zeolite NaA using kaolin as an alternative source of silica. The main objective of this research was to prepare NaA zeolite using metakaolin derived from kaolin from the state of Rio Grande do Norte, Brazil, as an alternative source of silica, reducing the production cost and evaluating its thermal stability. In addition, a study of the thermal stability of the zeolite and cost estimates for zeolite production were carried out. Traditional methods o [...]