Marjorie Baynosa

University of the Philippines | UPD · Department of Chemical Engineering

The construction of a Z-scheme photocatalyst by coupling semiconductors with conductors is an efficient way to achieve high pollutant degradation efficiency. In this study, a hydrothermal approach was used to fabricate a Z-scheme photocatalyst consisting of C-MoS2 sheets wrapped around octahedral anatase TiO2 nanocrystals. The catalyst showed excel...

Hydrogen has attracted increasing attention as clean energy for fuel cells over the past decade. Photoelectrochemical (PEC) water splitting is considered the most feasible production method but its practical efficiency depends significantly on the photogeneration rate of electron (e⁻) and hole (h⁺) on a semiconductor photoanode and the rapid separa...

The article discusses the issues of processing slag of copper production using devices that model ideal mixing. It has been shown that the use of this type of apparatus increases the efficiency of physical and chemical processes and significantly reduces the copper content in dump slags. It has been found that the process of reduction of ferric iro...

Binary combinations of transition metal-layered double hydroxides (LDHs) have attracted considerable attention for supercapacitor applications owing to their extraordinary charge storage, low internal resistance, and superior electrochemical stability. In this study, nickel-cobalt LDHs (Ni-Co LDHs) nanosheets were grown hierarchically on the surfac...

Binary combinations of transition metal-layered double hydroxides (LDHs) have attracted considerable attention for supercapacitor applications owing to their extraordinary charge storage, low internal resistance, and superior electrochemical stability. In this study, nickel-cobalt LDHs (Ni-Co LDHs) nanosheets were grown hierarchically on the surfac...

The article presents results for the preparation of salts of sulfated amides based on oleic acid and piperidine. The products were synthesized in several steps: the first step of the reaction of oleic acid with piperidine, second step of sulphonation with sulfuric acid of the obtained compounds, the third step of the reaction of NH4OH and (HOCH2CH2...

This study reports the simultaneous determination of phenolic antioxidant compounds of gallic acid (GA) and caffeic acid (CA). The composite probe was fabricated by electropolymerizing 5-amino-2-mercapto-1,3,4-thiadiazole (p-AMT) on nitrogen-doped carbon sphere (N-CS) modified glassy carbon (GC) electrode. The N-CS was derived by carbonizing poly(o...

This article describes the synthesis of Ni3S4/NiS2/MoOx composite as an electrode material for the electrocatalytic sensor for d-penicillamine (D-PA). The detection of D-PA is important in biodiagnostics and therapeutic dosage control. The present study compared the performance of Ni3S4/NiS2/GC and Ni3S4/NiS2/MoOx/GC electrodes for the electrocatal...

Zinc ferrite and graphene composites have attracted considerable attention in wastewater treatment. In this work, a magnetically separable mesoporous composite of ZnFe2O4 nanoparticles (NPs) and reduced graphene oxide (rGO) was prepared through a simple and eco-friendly method with pure water as solvent and without the need for subsequent thermal t...

Metal oxide/graphene photocatalysts have been attracting considerable attention in solving environmental pollution problems because of the limitations of the semiconductor-based photocatalysts. In this study, highly efficient and inexpensive zinc oxide (ZnO)nanoparticles with three different morphologies, such as nanospheres, nanodisks, and nanorod...

The Cu ²⁺ -1,10-phenanthroline-5,[email protected] reduced graphene oxide (Cu ²⁺[email protected])composite electrodes were prepared by the electrochemical immobilization of 1,10-phenanthroline on the ERGO modified glassy carbon electrode (ERGO/GC)for the electrocatalytic determination of L-cysteine (CySH). The as-fabricated Cu ²⁺[email protected]/G...

Three-dimensional (3D) γ-MnO2@ZnFe2O4/reduced graphene oxide (rGO) nanohybrids were synthesized using a one-pot hydrothermal self-assembly method. The morphology and properties of the nanohybrids were investigated. The synergistic interactions among γ-MnO2, ZnFe2O4, and rGO resulted in 3D nanoflakes distributed uniformly in the rGO structure with a...

This paper reports a facile solvothermal method for the synthesis of Bi2S3 flower-like nanostructures grown in situ on a nitrogen-doped reduced graphene oxide (Bi2S3@N-G) surface. Thiourea was used as the nitrogen source and reducing agent for graphene oxide. The surface morphology of the as-prepared Bi2S3@N-G composites was analyzed by field emiss...

In wearable and portable electronic devices, small size, lightweight, flexibility, and easy operability are necessary for energy storage system such as battery and supercapacitor. To improve the performance, high specific capacity and high energy and power densities are also required. In this study, flower-like Cu1.8S nanostructures are synthesized...

An electrode comprised of a polydiaminobenzene (p-DAB) film formed on electrochemically reduced graphene oxide (ERGO) on a glassy carbon (GC) ([email protected]/GC) was fabricated using a potentiodynamic method for the sensitive and selective determination of nitrite in the presence of a common interference. The [email protected]/GC film-modified e...

In this study, an eco-friendly benign method for the modification of electrochemically reduced graphene oxide (ERGO) on glassy carbon (GC) surface and electrochemical polymerized 3,5-diamino-1,2,4-triazole (DAT) film composite (pDAT@ERGO/GC) electrode was developed. The surface morphologies of the pDAT@ERGO/GC modified electrode were analyzed by fi...

Nanocomposites of Ag-ZnFe2O4@reduced graphene oxide (rGO) were synthesized using a one-pot microwave-assisted self-assembly method. The morphology and structure of the Ag-ZnFe2O4@rGO nanocomposites were characterized. The nanocomposites formed with 15.2 wt% rGO showed excellent adsorption properties and high photocatalytic activity for the degradat...

The performance of a small-scale two-phase anaerobic digestion system which processes municipal solid wastes, i.e. vegetable and fruit wastes, was evaluated at mesophilic conditions. An anaerobic digester which required 5 L of fresh cow manure, 5 L of solid waste feed, 5 L each of leachate from the solid waste, and 1 L of anaerobic seeding had been...