Removal of Ni(II), Cd(II) and Cr(III) from industrial wastewater by raw and modified cotton stalk
Journal Title: Journal of Biodiversity and Environmental Sciences (JBES) - Year 2014, Vol 5, Issue 4
Abstract
Waste cotton stalk (CS) and surfactant modified CS (SMCS) biosorbents were evaluated for their ability to remove Ni(II), Cd(II), and Cr(III) ions from wastewater. Sodium dodecyl sulfate (SDS), a commonly used surfactant, was used to modify the raw biomass. The CS and SMCS biosorbents were characterized with Fourier transform infrared (FTIR) spectroscopy and scanning electron microscopy (SEM). The effects of several parameters, such as initial heavy metal (HM) concentration, pH of the solution, charge and concentration of the surfactant, on the sorptive properties of the SMCS were also investigated. The results showed that surfactant modification improved HM removal by the biosorbents, especially when concentration was below the critical micelle concentration (CMC). The trend of HM ions uptaken by the SMCS followed the order of Cr(III) > Ni(II) > Cd(II). Maximum HM removal efficiency of 100% was achieved for Cr(III) and ≥ 90% for Ni(II) and Cd(II) in concentration range of 1- 100 mg L-1. Sorption equilibrium data of HM on the biosorbents were analyzed and the results demonstrated that the most appropriate models to simulate the isotherms were Langmuir and Freundlich equations.
Authors and Affiliations
S. Dehghani, M. Esteki, S. F. Mousavi, B. Mostafazadeh-Fard
Keywords
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