Removal of Cd۲+ from Aqueous Solution by Nickel Oxide/CNT Nanocomposites
- سال انتشار: 1398
- محل انتشار: Iranian Journal of Chemistry and Chemical Engineering، دوره: 38، شماره: 1
- کد COI اختصاصی: JR_IJCCE-38-1_015
- زبان مقاله: انگلیسی
- تعداد مشاهده: 13
نویسندگان
Department of Chemistry, Science and Research Branch, Islamic Azad University, Tehran, I.R. IRAN
Department of Chemistry, Science and Research Branch, Islamic Azad University, Tehran, I.R. IRAN
Department of Physics, Qaemshahr Branch, Islamic Azad University, Qaemshahr, I.R. IRAN
Department of Chemistry, Science and Research Branch, Islamic Azad University, Tehran, I.R. IRAN
چکیده
The present work investigates the efficiency of the nickel oxide/carbon nanotube (NiO/CNT) nanocomposite for the removal of Cd۲+ metal ions from an aqueous. The NiO/CNT nanocomposite was synthesized by the direct co-precipitation method in an aqueous media in the presence of CNTs. The resulting materials were characterized by FT-IR, XRD, SEM, N۲ adsorption-desorption analysis. In order to optimize the adsorption of Cd۲+ ions on NiO/CNT nanocomposite, the effects of the different parameters—namely pH, contact time, initial concentration of Cd۲+, and adsorbent dosage—were also studied. Experimental data revealed that the Cd۲+ ions adsorption of the NiO/CNT nanocomposite was through Langmuir and Temkin isotherm models rather than the Freundlich model. The kinetic data of adsorption of Cd۲+ ions on the adsorbent was best described by a pseudo-second-order equation, indicating their chemical adsorption. Thermodynamic parameters such as ΔG°, ΔH°, and ΔS° were calculated. The obtained values showed that the adsorption was spontaneous and exothermic in nature. The reusability test showed that the Cd۲+ could be easily removed from the surface site of NiO/CNT nanocomposite by a ۰.۱ M nitric acid solution as the adsorption capacity was maintained after ۵ cycles of the adsorption/desorption process. This suggests that NiO/CNT nanocomposite can be reused through many cycles of water treatment and regeneration.کلیدواژه ها
Adsorption, Carbon nanotubes, Composite, heavy metals, Removalاطلاعات بیشتر در مورد COI
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