Inhibition of Copper Corrosion in H2SO4, NaCl and NaOH Solutions by Citrullus colocynthis Fruits Extract

The inhibitive effect of extract of Citrullus colocynthis fruits on copper corrosion in H2SO4, NaCl and NaOH solutions were studied using conventional weight loss and electrochemical polarization methods. Results obtained showed that extract functioned as effective and excellent inhibitors in the acidic, salt and alkaline media. Potentiodynamic polarization curves indicated that the plants extracts behave as mixed-type inhibitors. The fruit extract of Citrullus colocynthis demonstrated better inhibition efficiency in the acidic medium than in the alkaline and salt medium. The experimental data complied with the Langmuir adsorption isotherm and the value and sign of the Gibb’s free energy of adsorption obtained suggested that inhibitor molecules have been spontaneously adsorbed onto the copper surface through a physical adsorption mechanism. Keywords: Copper inhibition, kinetics, plant ex, Corrosion tract, Langmuir, weight loss, and thermodynamics

The production bioethanol from Ceratophyllum demersum L . in Iraq

Biofuels have attracted a lot of attention due to the growing demand for energy resources and concerns about greenhouse gas emissions. Unlike other green energy resources, biofuels like bioethanol, can provide liquid fuels that is essential for transportation. Second-generation bioethanol can be produced from lignocellulosic biomass through acid hydrolysis and fermentation. Lignocellulosic biomass is widely available and does not affect on the nutritional needs of agricultural crops. In this study, the aquatic plant Ceratophyllum demersum was used. Ceratophyllum demersum is a type of invasive aquatic plant that can live in fresh and brackish waters, and it is abundant in most regions of southern Iraq. The bioethanol with the highest concentration was identified by high-performance liquid chromatography (HPLC). The results showed that 14% of bioethanol was produced in the absence of acid hydrolysis, while the concentration of it increased to 25% with the presence of acid hydrolysis. Acid hydrolysis aims to increase the breaking bonds of lignin and hemicellulose, increase the porosity of the material, and damage the crystalline structure of cellulose, and thus facilitates its conversion to glucose and increases the percentage of ethanol production