Dyes Removal from Synthetic and Real Textile Wastewater by Magnetic nanoadsorbents.

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Date
2013
Authors
Nedal Marei
Samah Abu Ghayadhah
Suna Sihab
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 The presence of dyestuffs in wastewater poses an environmental concern since these organic contaminants are toxic to aquatic and non-aquatic life. In addition, these contaminants are difficult to remove or biodegrade, which poses a challenge to the conventional wastewater treatment techniquesIron-oxide nanoparticles are attractive for wastewater treatment for two important reasons. First, nanoadsorbents can remove contaminants from wastewater rapidly. Second, this type of iron oxide could be separated easily using magnet after finishing treatment process. In this project we aim at investigating the effectiveness of the magnetic iron oxide NPs in the removal of large organic contaminants (dyes) from real textile wastewater. This study provides valuable insight on the effect of NPs toward the treatment and recyclability of textile wastewater and two different types of model dyes crystal violet (CV), bromocresol green (BCG) and methylene red (MR) which is crucial for the textile industry. In this study, a batch-contact-time method is used for the treatment of a real textile wastewater sample obtained from a local factory in the city of Nablus. The effects of different experimental parameters such as contact time, initial concentration, solution pH, and coexisting anions on dye removal are investigated. Results showed that dye adsorption was fast, and equilibrium for CV, BCG, MR and real wastewater was achieved respectively within 10, 60,50 and 90 min. The adsorption equilibrium data fit  .very well to Langmuir and Freundlich adsorption isotherm models. The thermodynamics studies indicated that the adsorption was spontaneous, endothermic and physical in nature. The desorption and regeneration studies have proven that nanoparticles can be employed repeatedly without impacting its adsorption capacity. Therefore, magnetic nanoparticles are recommended as fast, effective and inexpensive adsorbents for rapid removal and recovery of contaminants from wastewater effluents, like textile industry  
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