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:: Volume 3, Issue 1 ( Winter 2016) ::
Environ. Health Eng. Manag. 2016, 3(1): 15-21 Back to browse issues page
Use of Aloe vera shell ash supported Ni0.5Zn0.5Fe2O4 magnetic nanoparticles for removal of Pb (II) from aqueous solutions
Samira Namavari , Farid Moeinpour
Department of Chemistry, College of Science, Bandar Abbas Branch, Islamic Azad University, Bandar Abbas, Iran , f.moeinpour@gmail.com
Abstract:   (13698 Views)

Background: Lead (Pb) is a heavy metal that is widely utilized in industries. It contaminates soil and groundwater. Its non-biodegradability, severe toxicity, carcinogenicity, ability to accumulate in nature and contaminate groundwater and surface water make this toxic heavy metal extremely dangerous to living beings and the environment. Therefore, technical and economic methods of removing Pb are of great importance. This study evaluated the efficiency of Ni0.5Zn0.5Fe2O4 magnetic nanoparticles supported by Aloe vera shell ash in removing Pb from aqueous environments.
Methods: The adsorbent was characterized by several methods, including x-ray diffraction (XRD), scanning electron microscopy (SEM), and Fourier transform infrared spectroscopy (FT-IR). Then, the potential of Aloe vera shell ash-supported Ni0.5Zn0.5Fe2O4 magnetic nanoparticles to adsorb Pb (II) was investigated. To determine the amount of lead absorbed by this adsorbent, different pHs (2, 4, 5, and 6), adsorbent doses (0.01-0.40 g), Pb concentrations (5, 10, 20, 30, 40, 50, 60, 80, 100, 200, 300, and 600 mg/L), and exposure times (0, 5, 10, 15, 20, 30, 40, 50, and 60 minutes until reaching equilibrium) were tested using an atomic absorption spectrometer (Varian-AA240FS). Residual concentrations of Pb were read.
Results: The results show that a time of 15 minutes, pH value of 9, and adsorbent dose of 0.2 g are the optimum conditions for Pb (II) removal by this adsorption process. Increasing the initial concentration of Pb (II) from 5 to 600 mg/L decreased removal efficiency from 98.8% to 73%. The experimental data fit well into the Freundlich isotherm model (R2 = 0.989).
Conclusion: Ni0.5Zn0.5Fe2O4 magnetic nanoparticles supported by Aloe vera shell ash comprise a low-cost, simple, and environmentally benign procedure. The maximum monolayer adsorption capacity based on the Langmuir isotherm (R2 = 0.884) is 47.2 mg g-1. The prepared magnetic adsorbent can be well dispersed in aqueous solutions and easily separated from them with the aid of an external magnet after adsorption. The process for purifying water presented here is clean and safe. Therefore, this adsorbent is applicable to managing water pollution caused by Pb (II) ions.

Keywords: Adsorption, Pb (II) ions, Ni0.5Zn0.5Fe2O4, Aloe vera, Aqueous solutions
eprint link: http://eprints.kmu.ac.ir/id/eprint/25229
Full-Text [PDF 652 kb]   (3304 Downloads)    
Type of Study: Original Article | Subject: General
Received: 2016/04/4 | Accepted: 2016/04/4 | Published: 2016/04/4
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Namavari S, Moeinpour F. Use of Aloe vera shell ash supported Ni0.5Zn0.5Fe2O4 magnetic nanoparticles for removal of Pb (II) from aqueous solutions. Environ. Health Eng. Manag. 2016; 3 (1) :15-21
URL: http://ehemj.com/article-1-137-en.html


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Volume 3, Issue 1 ( Winter 2016) Back to browse issues page
Environmental Health Engineering And Management Journal Environmental Health Engineering And Management Journal
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