Current Physical Chemistry - Volume 7, Issue 4, 2017

Aims: In this study, copper extraction was investigated from chalcopyrite concentrate with hydrogen peroxide and acetic acid mix solution by using response surface methodology. Method: Experiments were planned using Box-Behnken in which various parameters such as leaching time, leaching temperature, H2O2 concentration, liquid-solid ratio, and stirring speed were defined as independent variables. Result: Under optimum e Read More

Aims: Zinc plant leach residues as well as other industrial wastes have remarkable economic value due to the contents of the high amount of valuable metals and also having a risk of polluting to the environment. Observations: It is generally accepted that these leach residues must be evaluated to eliminate the negative effects on human life. In this study, therefore, zinc and lead recoveries were investigated from envir Read More

Aims: Ni-Mo alloy coatings could represent a key material for several leading applications of engineering. Indeed these coatings present excellent physico-chemical characteristics such as magnetism, wear-resistance, heat-conductivity, and electrocatalytic properties. Observations: Ni-Mo alloys have been electrowon, with a pH 5.8 sulphate catholyte containing 40 g/l Ni and Mo in the range 1-4 g/l, sodium citrate and acetic acid, Read More

Aim: In this study, copper recovery from aqueous solutions by precipitation with sugar beet molasses, an industrial by-product, in the high temperature-pressure reactor was investigated. Method: Copper recovery experiments from hypothetical copper sulphate solutions (150 ml of 10 g Cu2+/L) were designed by RSM (Response Surface Methodology) using CCD route (Central Composite Design) to observe the effect of th Read More

Aim: In this study, the hydrodynamic behavior and mass transfer characteristics of a cocurrent down flow contacting reactor (CDCR) were investigated for air-tap water and airfermentation broth systems. Observation: As gas and liquid flow rates increased, the values of kLa and gas hold ups increased. The values of kLa measured in the air-fermentation broth system were all lower than those in the air-tap water syste Read More

Background: Amorphous silica is widely used in cement and ceramic industry and also for the synthesis of many advanced materials. Method: Generally, it is produced using sol-gel and precipitation method. In the present study, amorphous SiO2 was extracted from acidic pumice collected from Van Basin in Turkey by alkaline treatment method. Result: The identification and chemical compositions of the acidic pumice and th Read More

Aims: A low-cost medium for α-amylase is critical for the growing demands of industries. Method: In this study, α-amylase production was investigated using different agro-industrial products (wheat bran, cheese whey, soy bean cake, hazelnut oil cake) and supplemental nutrients (peptone, ammonium sulfate) using semi-solid substrate fermentation (SSSF). Observation: The experiments were planned in two stages Read More

Aim: The analysis of the gaseous and condensed thermodynamic function of all atoms of Mendeleev’s Periodic table was carried out and seventy nine equations of such type as Δg,f,sΨo = i ± f N, in which Δg,f,sΨo is thermodynamic function, N is the number of atom electrons and i and f are stoichiometric coefficients, have been formulated. Method: The obtained equations can be used for the next calculation of bond strengt Read More

Aim: In this paper, we report that sodium benzoate is a good inhibitor for SO2 oxidation in the pH range 4.02-5.25 in the presence of Ag (I). Based on the observed results the following rate law is given and a free radical mechanism has been proposed. -d[S(lV)]/dt = (k1+ k2[Ag(I)]) [S(lV)]/1 + B [Sodium Benzoate] Methods: Experiments were carried out at 30≤T°C≤40, 4.02≤pH≤5.25, 1×10−3 mol/cm3≤ [S(lV)≤10×10−3 mol/cm Read More