Kinetic and Isotherm Study of 2,4,6-Trichlorophenol’s Fast Adsorption from Aqueous Solutions by Synthesized Magnetite-Bentonite Nanocomposite
- 作者: Soltani Goharrizi R.1, Taghavi L.1, Sarrafi A.2, Karbasi A.3, Moradi Dehaghi S.4
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隶属关系:
- Department of Natural Resources and Environment, Science and Research Branch
- Department of Chemical Engineering
- University of Tehran
- Department of Chemistry
- 期: 卷 41, 编号 6 (2019)
- 页面: 347-356
- 栏目: Physical Chemistry of Water Treatment Processes
- URL: https://journals.rcsi.science/1063-455X/article/view/184153
- DOI: https://doi.org/10.3103/S1063455X1906002X
- ID: 184153
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详细
Organic pollutants in water have been the main contaminations of concern for man. 2,4,6-Trichlorophenol (TCP), is a toxic carcinogen phenolic derivative which exists in effluents of chemical industries and the removal of this pollutant is critical. As the removal of TCP from industrial effluents is important, various techniques have been applied such as adsorption, chemical oxidation, chemical coagulation, and anaerobic biodegradation. In adsorption technique, nanobentonite is considered as a suitable adsorbent due to the low cost, small size of particles, large surface area, naturally available, and intense adsorption capacity. To separate adsorbent particles easily through an external magnetic field, magnetic nanomaterials, such as Fe3O4, can be fixed on nanobentonite. In this research, magnetized bentonite nanocomposite was synthesized for fast adsorption of TCP from aqueous solutions. The adsorbent was characterized by a Vibrating-Sample magnetometer (VSM), Transmission Electron Microscopy (TEM), Fourier Transform Infrared spectroscopy (FTIR), X-Ray diffraction (XRD) and Zetasizer Nanoparticle analyzer and the effect of adsorbent dose; pH and contact time parameters on the adsorption process of TCP were evaluated. Moreover, the isotherms and adsorption kinetics were studied. The pH 5 was considered as the optimal pH. The results of kinetic experiments showed that by increasing the contact time, the adsorption efficiency was increased and the equilibrium contact time was found to be about 60 minutes. In optimal pH and equilibrium time (60 min) conditions with the adsorbent dose of 1 g/L, the percentage of adsorption by magnetized nanobentonite was achieved 96.777% while unmodified bentonite adsorbed 68.25% of TCP in equilibrium time of 3 h. The experimental data of adsorption indicated more conformity with the pseudo-second-order and Langmuir isotherm models. As a deduction, nanobentonite with high adsorption capacity was prepared from bentonite mines of Iran and magnetized by Fe3O4 leading to easy and fast separation of nanocomposite TCP from the solution.
作者简介
R. Soltani Goharrizi
Department of Natural Resources and Environment, Science and Research Branch
Email: taghavi_lobat@yahoo.com
伊朗伊斯兰共和国, Tehran
L. Taghavi
Department of Natural Resources and Environment, Science and Research Branch
编辑信件的主要联系方式.
Email: taghavi_lobat@yahoo.com
伊朗伊斯兰共和国, Tehran
A. Sarrafi
Department of Chemical Engineering
Email: taghavi_lobat@yahoo.com
伊朗伊斯兰共和国, Kerman
A. Karbasi
University of Tehran
Email: taghavi_lobat@yahoo.com
伊朗伊斯兰共和国, Tehran
Sh. Moradi Dehaghi
Department of Chemistry
Email: taghavi_lobat@yahoo.com
伊朗伊斯兰共和国, Tehran