جستجوی مقالات مرتبط با کلیدواژه "راکتیو قرمز 198" در نشریات گروه "پزشکی"

Dyes are among the most hazardous chemicals in industrial wastesdue to their toxicity for aquaculture, reduction of light permeability, and in turn development of disorders in photosynthesis process. The current study aimed to investigate the efficiency of coral in removing red reactive 198 from textile dye wastewater was investigated.
In this experimental study, the adsorption process was completedperformed on a synthetic sample in a batch systemOptimal conditions was also performed on the real wastewater of Yazdbaf textile factory. The effects of such parameters as the pH, dye's concentration, contact time, sorbent's dose, and temperature were investigated, following this, adsorption isotherms were determined and then the process was examined kinetically and thermodynamically. Next, the study data was analyzed by SPSS (ver,21), EXCEL 2007, applying Pearson correlation coefficient.
The optimal conditions in removing the dye included pH=3, an equilibrium contact time of 120 min, 25 mg/L of the dye's concentration, and 3g/100mg of the sorbent's initial value. Underthe optimal conditions, the dye's removal efficiency and the maximum adsorption capacity in the synthetic and real wastewater sample of Yazdbaf Company were 97.63%, 8.14 mg/g and 67.78%, 5mg/g respectively.The equilibrium data followed the Langmuir adsorption isotherm with a correlation coefficient of R2=0.96 and the adsorption's kinetics followed pseudo-second-order model with a correlation coefficient of 1 (R2=1). The thermodynamic investigations also indicated that the adsorption is of physical process an endothermic.
Asthe results revealed, the good performance of the coral sorbent in removing dyes in aquatic environments, enjoying suitable density, havingquick precipitation properties, not needing activation, and environmental safety of the process can encourage the efficiency of this adsorbent in treatment of dye-containing wastewaters.

colors make many problems and these are major sources of environmental pollution. Therefore, this wastewater should be treated before discharge to environment to reduce the environmental threats. Adsorption is one of the usual processes for color removal from wastewater. Nanotubes are new adsorbents with extend application for adsorption of different compounds. Aim of this study was survey on feasibility of single-walled carbon Nanotubes as adsorbent to reactive red 198 dye adsorption from aqueous solutions. This study was done in a batch reactor. The effects of various parameters such as contact time mixing intensity, initial dye concentration, pH and single-walled carbon Nanotubes dose on removal of Reactive Red 198 color was investigated. The results showed the optimal time for achieve to maximum adsorption and equilibrium is 3 hours. More increasing in adsorbent dose from 0.1 to 0.9 g, more increasing in dye removal efficiency from 91.8% to 100%. It was found that the maximum adsorption capacity of reactive red 198 on single-walled carbon nanotubes was 7.98 mg/gr and it was occurred in acidic condition (pH = 4). Decreasing in initial dye concentration from 50 to 25 mg/l in pH 4 and during 3 hours can cause increasing in removal efficiency from 9/96% to 100%. The results showed reaction kinetic was described by Pseudo-first order equation and adsorption isotherm was followed both Freundlich and Langmuir isotherm models. Due to the small size, high surface area, crystalline shape and unique regularity of the network, the reactivity of single-walled carbon Nanotubes is very high. Single-walled carbon nanotubes have impressive performance as adsorbents to removal of reactive red dye 198.

Backgrounds and Carcinogenic and mutagenic potential of some azo dyes as a category of common dyes in different types of industries has been reported. The degradation of one commercially available dyestuff [C.I. Reactive Red 198 (RR 198)] by means of ultraviolet radiation (UV), ultrasonic irradiation (US), UV/H2O2 and US/H2O2 processes was investigated. Photolysis process was accomplished in a laboratory-scale batch photoreactor equipped with an 55W immersed-type low-pressure mercury vapour lamp (UVC) and sonication in a sonoreactor with low frequency (42 kHz) plate type transducer at 170W of acoustic power with emphasis on the effect of various parameters on decolouration and degradation efficiency. Initial results showed that, color removal efficiencies by US and US/H2O2 processes were negligible. Almost complete disappearance of RR 198 (20 mg/L) in UV/H2O2 process was possible to achieve after 10 min of irradiation. It is found that lower pH and lower concentration of dye favor the dye degradation. Hence any increase in initial dye concentration results in decreased decolouration rates. Also, the experimental results indicated that the kinetics of sono-oxidation and photo-oxidation processes fit well by pseudo-first order kinetics and first order reaction kinetics, respectively. It is concluded that UV/H2O2 reaction was more effective than other reactions in bleaching and the reaction rate was sensitive to the operational parameters and increased with increasing H2O2 concentration up to 15 mM.