University of Tabriz

About: University of Tabriz is a education organization based out in Tabriz, Iran. It is known for research contribution in the topics: Population & Nanocomposite. The organization has 12141 authors who have published 20976 publications receiving 313982 citations.

Comparative photocatalytic degradation of two dyes on immobilized TiO2 nanoparticles: Effect of dye molecular structure and response surface approach

Abstract: In this work, comparative photocatalytic degradation of an anionic dye (CI Acid Blue 92 (AB92)) and a cationic dye (CI Basic Blue 3 (BB3)) under UV light irradiation using supported TiO2 nanoparticles in a rectangular photoreactor was studied The investigated TiO2 was Millennium PC-500 (crystallites mean size 8 nm and surface area of 32076 m2/g) immobilized on glass plates Response surface methodology (RSM) was employed to assess individual and interactive effects of the four main independent parameters (initial dye concentration, UV light intensity, flow rate and reaction time) on the decolorization efficiency Central composite design was used for optimization of UV/TiO2 process Predicted values of decolorization efficiency were found to be in good agreement with experimental values for AB92 and BB3 (R2 = 09435 and Adj-R2 = 08941, R2 = 09309 and Adj-R2 = 08704, respectively) Optimization results showed that maximum decolorization efficiency was achieved at the optimum conditions: initial dye concentration 10 mg/L, UV light intensity 472 W/m2, flow rate 100 mL/min and reaction time 200 min Photocatalytic mineralization of the dyes was monitored by total organic carbon (TOC) decrease The degradation pathway of AB92 was proposed based on the identified compounds by GC–Mass technique

Effect of Short-Term and Long-Term Persistence on Identification of Temporal Trends

Abstract: In this study, the trends in precipitation in the northwest (NW) of Iran were identified using the four different versions of the Mann-Kendall method, i.e., the conventional Mann-Kendall method (MK1); the Mann-Kendall method following the removal of the effect of significant lag-1 autocorrelation (MK2); the Mann-Kendall method after the removal of the effect of all significant autocorrelation coefficients (MK3); and the Mann-Kendall method by considering the Hurst coefficient (MK4). Identification of trends was carried out on different time scales (monthly, seasonal, and annual) using the precipitation data of 50 years from 1955 to 2004 of the sixteen stations selected from the NW region of Iran. The Theil-Sen method was used to estimate the slopes of trend lines of precipitation series. Results showed that: (1) on a monthly time scale, the statistically significant Z-statistics were negative for all but one (July) month; and the strongest negative (positive) precipitation trend-line slope among all the negative (positive) cases was found to be −0.89ð0.38Þ mm=year at Bijar (Kermanshah) station in NW Iran; (2) on a seasonal time scale, the median of trend-line slopes was found to be negative in all four seasons; the winter and spring season's precipitation series witnessed negative trends for almost all the stations using all four different versions of the MK test; and in the summer and autumn seasons, both upward and downward trends were observed for most of the sites of NW Iran; (3) in an annual time scale, all stations had witnessed negative trends using both the MK1 and the MK4 tests. However, application of the MK4 instead of the MK1 reduced the absolute value of the Z-statistic for most of the time series. The strongest negative annual trend-line slope was −4.04 mm=year at Bijar station. Therefore, the observed decreases in precipitation in NW Iran in the recent half of the past century may have serious implications for water resources management under the warming climate with probably a higher rate of the population growth and the higher consumption of freshwater as a result of the rise in standards of living of the population of NW Iran. DOI: 10.1061/(ASCE)HE.1943-5584.0000819. © 2014 American Society of Civil Engineers.