Dyes are the most important materials in industries which are dangerous to ecological systems due to their toxic properties. This study investigated the photocatalytic efficiency of TiO2 nanoparticles stabilized on a glass plate in order to remove Acid Red1 (AR1) dye in an aqueous solution under UV Light. In this research, the photocatalytic decomposition of the AR1 dye was carried out in a batch tubular reactor with a recirculating flow. Effective parameters on the process such as: the initial pH of the solution, the concentration of AR1, the distance of the lamp from the catalysts’ surface, the concentration of H2O2, and the flow rate were studied. The morphological properties of the Titanium dioxide nanoparticles stabilized on the glass plate were investigated through SEM and AFM. The favorite dye removal efficiency for a solution containing 30 mg/L of AR1 was obtained in the pH of 2.5, H2O2 concentration of 10.12 mM, radiation time of 120 min, and the lamp-catalyst surface distance of 10 cm. In these conditions, the dye removal efficiency became approximately 99%. پرونده مقاله

Dyes are widely used in various industries, since theirdirect discharge to nature can cause many biological and environmental problems. Some of these dyes are toxic, carcinogenic and can cause skin and eye irritation. There are various dye removal techniques, but Adsorption found to be very effective and cheap method among the all available dye removal methods. The purpose of this study was to investigate the adsorption of C.I. Acid Red 1 (AR1)dye pollutant to sunflower seed shells (SSS) and pine cones(PC) as agro waste materials, to find out the optimalconditions formajor operational parameters such as contact time, adsorbent dosage, initial dye concentration and pH. The results showed that the optimal conditions for decolorization of the solution containing 40 mg/L AR1,by SSS and PC adsorbentswith removal efficiency of 84.2% and 74.47%, respectively, were obtained at100 min of contact time and pH= 2 at room temperature.Optimal value of adsorbent dosage for SSS and PC was determined 2.6 and 3.2 g/L, respectively.The physicochemical properties of the adsorbent were studied using various descriptive techniques such as FTIR, SEM, and BET.The adsorption process of both adsorbents was best fitted to Freundlich modeland followed pseudo-second-order rate kinetics. پرونده مقاله