Removal of direct blue 129 from aqueous medium using surfactant-modified zeolite: a neural network modeling
Journal Title: Environmental Health Engineering and Management Journal - Year 2018, Vol 5, Issue 3
Abstract
Background: Conserving water for human survival and providing future security are important issues that need to be addressed. Methods: In this study, a zeolite modified with hexadecyl trimethyl ammonium bromide (HDTMA-Br), a cationic surfactant, and its application in removing direct blue 129 (DB129) was examined. Fourier transform infrared spectroscopy (FT-IR) and scanning electron microscopy (SEM) were used to characterize both modified and unmodified zeolites. The effects of operational parameters such as the amount of adsorbent, initial dye concentration and pH on the removal efficiency of the dye were examined. Results: The results showed that in the initial dye concentration of 50 mg/L, the optimum amounts of adsorbent and pH were 0.3 g and 7, respectively. Increasing the dye concentration from 20 to 100 mg/L resulted in the reduction of the removal efficiency from 100% to 79% in the contact time of 90 minutes. The results indicated the highest attracting correlation with Langmuir model. The maximum adsorbent capacity obtained from Langmuir model was 25 mg/g. The kinetics of the dye adsorption on the modified zeolite followed pseudo-second-order kinetics model. Calculated thermodynamic parameters showed that Gibbs free energy changes (DGo) at temperatures of 20 and 45°C were -29.41 and -35.20 kJ/mol, respectively. Enthalpy (DHo) and entropy changes were equal to 41.181 kJ/mol and 0.241 J/mol K, respectively. The results showed that the processing was a spontaneous endothermic reaction. The process modeled by artificial neural networks (ANN) showed that the experimental results can be accurately modeled using neural network model. The correlation coefficient found between the experimental and the model results was 0.951. Conclusion: Due to the low cost, high abundance and availability of zeolite, the removal efficiency of this adsorbent can be increased to desirable levels by modifying.
Authors and Affiliations
Mahmoud Zarei , Nader Djafarzadeh, Leila Khadir
Keywords
Related Articles
- EP ID EP45350
- DOI 10.15171/EHEM.2018.15
- Views 358
- Downloads 0
Evaluation of the presence of coliform in bottled drinking water, released in Sari in 2016
Background: Today, bottled water is used in many countries of the world due to its relatively low cost, better taste, ease of access and low levels of impurities. In unfavorable conditions, the maintenance of microorgani...
Applying analytic hierarchy process method for quantitative assessment of environmental health factors in hospitals using existing quality checklists: A modeling and field study
Background: Since there are various factors with different importance that determine environmental health status of hospitals, judging and prioritizing the required corrective actions using the current qualitative checkl...
Effect of coagulation and sonication on the dissolved air flotation (DAF) process for thickening of biological sludge in wastewater treatment
Background: Dissolved air floatation (DAF) is one of the methods has been used for the sludge thickening in wastewater treatment plants. This study aimed to investigate the effects of coagulation and sonication process...
Photocatalytic removal of ciprofloxacin antibiotic from aqueous medium by applying AgI/Ag2O nanocomposite: Activity test, reaction kinetics, and catalyst reusability
Background: This study examined the removal of ciprofloxacin (CIP), which is a very widely used antibiotic, from an aqueous medium by applying AgI/Ag2O photocatalyst under visible light radiation. Methods: AgI/Ag2O was...
Effect of varying weight of mealworms (Tenebrio molitor L.) on styrofoam degradation
Background: Waste management involves systematic and sustainable practices, including recycling daily solid waste. Globally, styrofoam , a common type of plastic waste, is widely used in packaging and food services. In...