Efficiency of Multi-Walled Carbon Nanotubes in TPH Adsorption in Aqueous Solution (Case study: Naphthalene)

Subject Areas : environmental management

sahere fazlollahi ¹ (MSc. Student at Department of Environmental Engineering (Water and Wastewater), Science and Research Branch, Islamic Azad University, Tehran, Iran. * (Corresponding Author))
Amir Hesam Hassani ² (Associate Professor, Department of Environmental Engineering, (Water and Wastewater), Science and Research Branch, Islamic Azad University Tehran, Iran.)
Mehdi Borghei ³ (Professor, Department of Oil Chemistry Engineering, Sharif University, Tehran, Iran.)
Hamidreza Pourzamani ⁴ (Assistant Professor, Department Environmental Health Engineering, Esfahan University of Medical Sciences, Esfahan, Iran.)

Received: 2014-12-22 Accepted : 2015-08-08 Published : 2017-09-23

Keywords: Multi-Walled Carbon Nanotubes, Petroleum Hydrocarbons, Polycyclic aromatic hydrocarbo, Naphthalene,

Abstract :

Abstract Background and Objective: Oil pollution is a type of organic water pollution. The hydrocarbons constitute most of the petroleum composition. Most of the early aromatic hydrocarbons are naphthalene with two benzene ring which cause anemia and damage the retina. It is also toxic to plants and aquatic environment. The removal of this compound from water by multi-walled carbon nanotubes is reviewed in this study. Method: This experimental  study  was  done  in  a batch  system  to  investigate the effects of  variations factors such as contact time, naphthalene concentration and  dose of  nanotubes on removal of naphthalene. In this study, naphthalene concentration was determined during various steps using UV-vis spectrophotometer at 254 nm. Findings: Maximum surface adsorption of naphthalene onto multi-walledcarbon nanotubes was 33.3 mg/gr and the maximum adsorption occurred at acidic pH (pH =3). And the appropriate time for reaching the maximum adsorption rate of naphthalene and equalization state was 90 min. By increasing the adsorbent dose from 0.2 to 0.3 gr / l, removal efficiency of naphthalene solution with 10 mg/l initial concentration increased from 97% to 99.99%. By increasing naphthalene initial concentration from 3 to 10 mg/l, the removal efficiency increased from 73.33% to 99.99 % at pH=3 after 90 min. Adsorption mechanism followed pseudo first-order kinetics (R2=0.96). Discussion and Conclusion: This  adsorbent  could  be  effective  for  removal  of  naphtalene due  to its small  size, large surface area , crystal  shape  and  exclusive  network  arrangement  and  consequently  very  high reactivity and noticeable performance of multi-walled carbon nanotubes as adsorbent in removal of organic  pollutants  from  aqueous  solution.

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