E Bazrafshan, F , Kord Mostafapour , M Rezaie,
Volume 12, Issue 4 (3-2014)
Abstract
Introduction: Dyes are one of the most important existing pollutants in textile industrial wastewater. These compounds are often toxic, carcinogenic, teratogenic, and non- biodegradable. Carcinogenic and mutagenic potential of some azo dyes as a category of common dyes in different types of industries has been reported. Reactive red 198 is one of the azo dyes that are currently used in the textile industry. This study was performed to investigation of reactive red 198 dye removal by multi-wall carbon nano tubes (MWCNTs) from synthetic textile wastewater and also determination of adsorption isotherms.
Methods: This study was performed experimentally in laboratory scale and in a batch system. In this research the effect of initial dye concentration (10, 50, 100, 200 mg/L), absorbent dosage (0.01-0.05 g/100ml) reaction time (30, 60, 90, 120, 150, 180, 210, 240, 270 min) and pH (2,3,4,5,7,9,11) were investigated. The dye concentrations were measured via spectrophotometer (518 nm wavelengths). Adsorption isotherms were determined and correlated with Longmuir, Freundlich and Bet models.
Results: The maximum adsorption capacity of reactive red 198 onto MWCNTs was 1000 mg/g. According the results of this study, the most removal efficiency of dye equal 74.4% (372.02 mg/g) was obtained at initial dye concentration 50 mg/l at pH=4 , also, the best time for equilibrium was 3 hr. Also, the findings of this study well fitted with Longmuir isotherm (R2=0.9996), towards Freundlich and Bet models.
Conclusion: According to results of this study, it was concluded that the MWCNTs has high ability to remove Reactive Red 198 dye from aqueous solutions and textile industry wastewaters
H Jafari Mansoorian, Ah Mahvi , E Bazrafshan, A Jonidi Jafari ,
Volume 13, Issue 1 (5-2014)
Abstract
Introduction:Lead and zinc are among the most poisonous unnecessary heavy metals available in the environment and are among the first grade poisonous pollutants. In this study the efficiency of electrocoagulation process using alternating and direct current and iron and stainless steel rods for elimination of lead and zinc from battery industrial wastewater has been investigated.
Methods:Wastewater samples were taken from the battery building industry. In the electrochemical cell, metal iron and stainless steel rod electrodes were used and were connected together serially and unipolarly to the feeding source.
Results:By using alternating current, the elimination of lead and zinc was done successfully with iron electrodes and in the density of 6 mA/cm2 which were 96.7% and 95.2% and with stainless steel electrodes in density of 8 mA/cm2 which were 93.8% and 93.3% respectively. By using direct current, the optimum elimination of lead and zinc with iron electrodes leveled at 97.2% and 95.5% and in density of 6mA/cm2 and with stainless steel electrodes was equal to 93.2% and 92.5% in density of 8mA/cm2 respectively.
Conclusion:The results from this research are in line with the results from other studies. According to the results, this process can be applied as a suitable method for a wide use of electrolyte reactors in industrial scale and for eliminating lead and zinc from aqueous environments.
S Rahdar, M Ahmadabadi, E Bazrafshan, M Taghavi, M Amrollahi ,
Volume 15, Issue 1 (5-2016)
Abstract
Abstract
Introduction: Textile industry is regarded as one of the largest producers of dye and organic compounds, and Methylene Blue is the most commonly used dye material. In the present study, peanut shell powder was used as a low-cost adsorbent for removal of Methylene blue dye from aqueous solutions.
Methods: In this experimental study, effect of operating parameters including pH (2-12), reaction time (5-210 min), adsorbent dosage (0.1-1 g/l) and initial dye concentration (10-120 mg/l) were assessed on dye removal from synthetic wastewater. Moreover, the adsorption behavior of dye was evaluated by Freundlich and Langmuir isotherms.
Results: Maximum removal efficiency of methylene blue was achieved at optimal pH of 11, reaction time of 75 min, adsorbent dosage of 8 g/l and initial dye concentration of 10 mg/l. With increasing dye concentration from 10 to 100 mg/l, removal efficiency was decreased from 99.5% to 96.46%. The obtained data demonstrated that adsorption process of Methylene blue using peanut shell powder was well fitted with Langmuir isotherms (R2=0.894).
Conclusion: Based on the results of the current study, the peanut shell seems to have an appropriate ability in Methylene blue dye removal from aqueous solution, and textile industry wastewater.
