جستجوی مقالات مرتبط با کلیدواژه « Methylene Blue Dye » در نشریات گروه « مهندسی شیمی، نفت و پلیمر »

Novel polysulfone (PSf)-based nanocomposite membranes with different contents of Basil seed gum (BSG) nanoparticles were prepared using vapor-induced phase separation (VIPS) method. Planetary ball mill was used for preparation of BSG nanoparticles with diameters ranging between 30-50 nm (average: 42 nm). The prepared PSf nanocomposite membranes were characterized using SEM imaging and FTIR spectroscopy and evaluation of different properties of membranes including hydrophilicity, water content, mechanical properties, overall porosity, mean pore size, pure water flux and methylene blue (MB) rejection. Using BSG nanoparticles, hydrophilicity, pure water flux, Young’s modulus and MB rejection of PSf membrane were significantly enhanced. Using optimum content of nanoparticles, i.e. 3 wt.%, the maximum increase in pure water flux of membrane by 5933% from 0.6 to 36.2 L/(m2.h) was observed. The maximum MB rejection (99%) was measured for PSf membrane containing 5 wt.% nanoparticles.

Methylene blue dye in the wastewater must be completely removed because it causes problems for the environment. The aim of this study is to evaluate and determine the possibility of using absorbent obtained from the oak as a low-cost adsorbent for the removal of methylene blue from aqueous solution. In these tests, a batch system was used for the absorption process. The effect of pH, adsorbent dosage, and initial concentration of methylene blue, time and temperature as key parameters were evaluated. The Langmuir and Freundlich isotherm models were used to evaluate experimental data. The results that increasing pH increases the removal rate and the highest adsorption was obtained at pH 9. Also the Langmuir isotherm model is better than Freundlich model with data obtained. The thermodynamic study showed that the adsorption process was endothermic and spontaneous (high temperature) in nature. Finally, the results of this study indicate that used absorbent have high efficiency for removal of methylene blue.

In this research, graphene oxide (GO) was deposited on the surface of graphite electrodes by the electrodeposition(ED) method which was synthesized by the modified Hummer’s method. FESEM images, FTIR analysis and XRD pattern were employed to confirm the structure of GO. TiO2 nanoparticles were further immobilized on the surface of the graphene oxide fabricated graphite electrodes (TiO2-GO-GE) using solvent evaporation and then photocatalytic activity of the prepared TiO2-GO-CE was studied for the discoloration of solutions containing Methylene Blue (MB) cationic dye. The effect of parameters such as initial dye concentration, pH of solution and TiO2 content on the decolorization efficiency of the photocatalytic process was investigated. The obtained results indicated that the prepared TiO2-GO-GE can decolorize MB with high efficiency (90 %) after 120 min of photocatalytic process. Stability test was carried out in order to show important role of GO. Then, response surface methodology (RSM) method was employed to optimize photocatalytic process and examine simultaneous effect of parameters. The validity of the model for optimization and prediction of the process with low number of experiments was stablished by experimental results (low difference between predicted value (80.56 %) and experimental value (76.47 %)) and also by high value of correlation coefficient (96.87 %).