کارايي نانوکامپوزيت مغناطيسي گرافن اکسيد/ هالوسيت نانولوله (HNT/GO) به‌منظور حذف يون روي از محلول‌هاي آبي
Journal Title: آب و فاضلاب - Year 2018, Vol 29, Issue 1
Abstract
Efficiency of Magnetic Halloysite Nanotube/ Graphene Oxide Nanocomposite (M-HNT/GO) for Removal of Zinc Ions from Aqueous Solutions Industrial and municipal wastewater often contains metal ions that once they are in excess of permitted limit, they can be harmful to humans and aquatic animals’ health. Zinc is one of the pollutants which damages the aquatic environment and endangers the health of humans, animals and plants. In this study, graphene oxide (GO) with high surface area along with natural halloysite nanotubes (HNTs) and iron oxide nanoparticles were used as M-HNT /GO magnetic nanocomposite for the removal of zinc ions from aqueous solutions. The synthesized M-HNT/GO nanocomposite was characterized using FT-IR, XRD and SEM methods. Vibrating sample magnetometer technique (VSM) was used to measure magnetic properties. The effect of different parameters such as pH, initial concentration of metal, temperature, stirring speed, adsorbent dosage, and contact time on zinc removal by M- HNT/GO were investigated and optimum values were determined. Then, the efficiency of fabricated nano-adsorbent was studied for removal of zinc ions from real sample. Optimal conditions for zinc ions removal were found at pH 6, the contact time of 90 minutes, the ion concentration of 2ppm, the GO to HNT and Fe3O4 ratio of 1: 1: 10 respectively, the buckling speed 250 rpm, the adsorbent amount 0.005 g and the temperature of 25 ° C. The study of adsorption isotherms indicated the best fitting of experimental data with Freundlich isotherm model. To describe kinetic data, pseudo first order and pseudo second order kinetic models were used. Dynamic data for zinc metal was adapted to pseudo second order kinetics model. The results showed that synthesized nano-adsorbents could be used with 95.2% ± 0.41% for zinc removal from wastewater contaminants. Furthermore, the M- HNT/GO nano-adsorbents can be recycled and reused frequently.
Authors and Affiliations
Nastaran Zolfaghari, Ramin M. A. Tehrani, Fereshteh Hooshyar
Keywords
Related Articles
- EP ID EP333068
- DOI 10.22093/wwj.2017.49195.2139
- Views 98
- Downloads 0
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