Structural, textural and catalytic activity of CoO–Mn2O3 system as being influenced by La2O3-doping (0.75–3 mol%) and calcination temperatures (300–500 °C) were investigated. The techniques employed were XRD, N2-adsorption–desoprtion at −196 °C, EDX and catalysis of H2O2-decomposition in aqueous solution at 30–50 °C. The results revealed that the investigated system consisted of...
Acetylation of glycerol with acetic acid was carried out over bimetallic silver and copper deposited rice husk silica-alumina like ecofriendly green catalyst. Bio-additive like mono, di and tri acetyl glycerol synthesis from raw glycerol (one of the main product of biodiesel), which are gaining attention as additives for improving petroleum fuel properties towards biofuel...
Methyldiethanolamine (MDEA) as an organic material is a hazardous contaminant in the aquatic environment because of its adverse effects on aquatic life, environment, and humans. In this study, a batch reactor of ultraviolet (UV) light and peroxydisulfate was performed to investigate the degradation of MDEA in aqueous media. The effect of different experimental parameters such as...
In this study, trans-esterification of rice bran oil employing a heterogeneous catalyst like CaO has been conducted in a batch reactor with ethanol. The optimal set of various critical reaction parameters are found to be temperature of 70 °C, reactant molar ratio 9:1, agitation speed of 600 rpm, catalyst mount of 3 wt % to maximize the biodiesel yield. For the heterogeneous...
The inhibitive performance of seven synthesized 2-(2-benzimidazolyl)-4 (phenylazo) phenol (BPP_1–7) derivatives was investigated experimentally on the corrosion of copper in 2.0 M HNO3 acid using mass loss, thermometric and DC potentiodynamic polarization techniques. Quantum chemical calculations was investigated to correlate the electronic structure parameters of the...
The influence of monoethanolamine (MEA) and piperazine added into methyldiethanolamine (MDEA) aqueous solution on the desulfurization of natural gas was investigated by the method of equilibrium data determination in this paper. Four kinds of equilibrated systems, i.e. H2S-NG-MEA-water, H2S-NG-MDEA-water, H2S-NG-(MEA-MDEA)-water, H2S- NG-(MEA-MDEA-PZ)-water at the temperature...
A (Co,Mn)(Co,Mn)2O4/MgO catalyst was prepared by simple co-precipitation from an aqueous solution of the mixed metal salts using sodium carbonate. The calcination of the precipitate was characterized by TGA and XRD showing the generation of (Co,Mn)(Co,Mn)2O4/MgO by 773 K. The catalyst had a surface area of 45 m2 g−1 in the fully calcined state (873 K) and was characterized by XRD...
In the present study, biomass fiber (Luffa cylindrica) has been successfully used as biosorbent for the removal of a cationic dye namely, methylene blue, from aqueous solution using a batch process. The characterization of the biosorbent was carried out by the infrared spectroscopy (FTIR) and scanning electron microscopy (SEM). The chemical composition has been established by the...
Corrosion inhibition of mild steel in hydrochloric acid solutions using electropolymerized Poly 2-aminobenzothiazole, P(2ABT), was evaluated using weight loss, potentiodynamic polarization and electrochemical impedance spectroscopy measurements at different temperature. Results showed that the inhibition efficiency increases with increasing the concentration of P(2ABT) up to 12.7...
Photocatalytically active zinc oxide is used as a white pigment for cosmetics, leading to decomposition of a certain degree of sebum on the skin upon exposure to the ultraviolet radiation in sunlight. Herein, as novel white pigments for use in cosmetics, zinc phosphates were prepared from zinc nitrate and various phosphate compounds, viz., phosphoric acid, sodium di-hydrogen...
The corrosion inhibition study of 2-chloro 3-formyl quinoline was conducted for mild steel corrosion in 1 M hydrochloric acid solution at a temperature range of 303–333 K by chemical and electrochemical measurements. Inhibition efficiency increases with the increase of inhibitor concentration but decreases with increasing temperature. The polarization measurement reveals that the...
Electrochemical studies of the synergistic effect of p-phenylenediamine and n,n diphenylthiourea (TPD) as corrosion inhibitor of mild steel in dilute sulphuric and hydrochloric acid through weight loss and potentiodynamic polarization at ambient temperature were performed. Experimental results showed the excellent performance of TPD with an optimal inhibition efficiency of 88.18...
A new grafted polymer electrode self modified with activated carbon (GPESMAC) was fabricated and electrochemical characterization by cyclic voltammetric analysis. The polystyrene was used as polymer grafted with acrylonitrile as a monomer and activated carbon as improvement material using gamma irradiation to produce a new copolymer. The redox process of K3Fe(CN)6 during cyclic...
The nanoparticles tin oxide (SnO2) has been successfully synthesized via a sol-gel method. The as-prepared SnO2 was characterized using thermogravimetric analysis coupled with mass spectroscopy, X-ray diffraction and scanning electron microscope. Batch experiments were carried out to study the adsorption kinetics of Congo red azo dye on SnO2. The effect of varying parameters such...
The feasibility of bioethanol production using durian seed waste was investigated in this study. The effects of hydrolysis parameters (temperature, time, pressure and solid to water ratio) on the yields of reducing sugars and bioethanol were also examined. Central composite design was used to determine the optimum conditions of both reducing sugars yields obtained from hydrolysis...
Degradation of Brilliant Green (BG) dye has been studied using Fenton reagent in the dark environment. The intensity of dye color was pH dependent with maximum absorbance at pH 6. N-de-alkylation caused dye decomposition which resulted in the reduction of absorbance. The rate of BG dye decolorization increased with an increase in the H2O2 and Fe2+ concentration. The presence of...
Uranium(VI) recovery from concentrated Egyptian hemi-dihydrate wet-process phosphoric acid, 9.2 M, is investigated using synergistic organophosphorous solvent mixture of dinonyl phenyl phosphoric acid (DNPPA) and tris(2-ethylhexyl)phosphate (TEP). The effect of various factors such as [DNPPA] concentration, [TEP] concentration, phosphoric acid concentration, shaking time, aqueous...
In the present study, Afzelia quanzensis bark extract was tested for the biosynthesis of silver nanoparticles (AgNPs). Based on UV–Vis spectrum analysis, the characteristic absorption band was observed at 427 nm. Furthermore, the size and shape of the nanoparticles ranged from 10 to 80 nm and were spherical in shape as observed through SEM analysis. In addition, the X-ray...
Introduction The inhibition performance of three peels, for instance Pisum sativum (PS), Solanum tuberosum (ST), and Citrus reticulata (CR), on aluminum alloy (AA) in 1 M NaOH solution was investigated using weight loss, electrochemical impedance spectroscopy (EIS), linear polarization, and potentiodynamic polarization techniques (Tafel). Results It was found that these three...
A modification glassy carbon electrode was fabricated as biosensors by mechanical attachment with carbon nanotubes to detect the effect of different concentrations of ascorbic acid (AA) on mercury ions in blood of human healthy samples using cyclic voltammetric technique. The oxidation potential peak of mercury ions in blood medium was appeared at 0.2 V, while the same peak in...
An efficient methodology of polyaniline–TiO2 nancomposite (PAniTNC) was developed through various proportions of ceramic added by chemical polymerization at room temperature. The chemical polymerization reactions were carried out using potassium perdisulphate as an oxidizing agent. The particle size of PAniTNC was found in the range of 8–15 nm as analysed by transmission electron...
Ceria-based composites have been previously developed as functional electrolytes for high performance of solid oxide fuel cells that require high functional electrolyte materials that can provide high ion conductivity for sufficient current output. These composites display hybrid proton and oxygen ion conduction. We developed further composite electrolyte materials containing a...
Background The inhibitive effect of the aqueous extract of Rothmannia longiflora (RL) on the corrosion of mild steel in 1 M HCl and 0.5 M H2SO4 solutions was investigated by weight loss measurement as well as potentiodynamic polarization and electrochemical impedance spectroscopy measurements. Result The extract was found to efficiently inhibit the corrosion process in both...
Quantum chemical calculations based on density functional theory method were performed on two pyrimidine derivatives which may be used as corrosion inhibitors for austenitic stainless steel. The quantum chemical properties of the two pyrimidine derivatives that are most relevant to their potential action as corrosion inhibitors have been calculated. To explain the inhibition...