جستجوی مقالات مرتبط با کلیدواژه « Methyl Orange » در نشریات گروه « پزشکی »

In recent years, the dye industry has been rapidly developed. Dyes are one in all the foremost dangerous groups of chemical compounds found in industrial effluents, which are of considerable importance for reasons like reduced light permeability and therefore the subsequent disruption of the method of photosynthesis in water sources. This study was performed to remove dye using Fe-Co-V /Zeolite from synthetic wastewater. 

After chemical synthesis of the nanocomposite, its structure by spectroscopic techniques was studied. Experiments were performed Under different pH conditions (3-11), contact time (5-50 minutes), absorbent dose (0.5-0.6 g), stirring speed (240-60 rpm), and different concentrations.

The results showed that the optimal and final conditions affecting the removal of methyl orange dye in the most suitable conditions for 200 mL of solution with a concentration of 20 mg/L at pH equal to 3, contact time 20 Minute, adsorbent weight 0.2 g, jar speed 180 rpm and temperature 25 °C, which finally with the application of optimal data, at a concentration of 2.5 mg/L, the best efficiency was obtained. Examination of isotherm diagrams and isotherm coefficients showed that the adsorption process follows the Freundlich equation.

According to the obtained results and physical and chemical properties of the synthesized nanocomposite, it can be used to remove pollutants from the environment such as wastewater and gaseous pollutants from the air.

Visible light active ZnWO4/ZrO2 nanocomposite was prepared via hydrothermal method. The nanocomposite was characterized by UV-visible diffuse reflectance spectroscopy (UV-vis-DRS), Fourier transform infrared spectroscopy (FT-IR), X-ray diffraction (XRD), Scanning Electron microscopy (SEM), energy dispersive X-ray spectroscopy (EDX) and transmission electron microscopy (TEM) techniques. The XRD results showed that average particle size of ZrO2, ZnWO4 and ZnWO4/ZrO2 were found to be 29.20 nm, 23.78 nm and 20.14 nm respectively and the phase structure for ZrO2 and ZnWO4 in the composite was Rhombohedral and Monoclinic respectively. The UV–vis absorption spectra of the ZnWO4/ZrO2 nanocomposite noticeably shifted to the visible light region compared to that of the ZrO2. The prepared photocatalyst were composed of plate and spongy sphere with little agglomeration was seen from SEM result. The photocatalytic activities of the prepared nanocomposite was evaluated for the degradation of methyl orange (MO) under visible light irradiations. The effect of operational parameters such as initial dye concentration, pH, catalyst concentration and irradiation time have been investigated in detail. The photocatalytic degradation efficiency of ZnWO4/ZrO2, ZnWO4 and ZrO2 for 95%, 72% and 60 % respevtively. The high photocatalytic activity can be attributed to stronger absorption in the visible light region, a greater specific surface area, smaller crystal sizes, more surface OH groups, and to the effect of ZnWO4 doping, which resulted in a lower band gap energy.