Ultrafiltration of natural organic matter from water by vertically aligned carbon nanotube membrane

Journal of Environmental Health Science Engineering

Reza Rezaee³  Ramin Nabizadeh²  Alimorad Rashidi¹  Simin Nasseri⁴  Amir Hossein Mahvi⁵  Ali Jafari² 

[1] Nanotechnology Research Institute of Petroleum Industry (RIPI), West Blvd. Azadi Sport Complex, Tehran, Iran;Department of Environmental Health Engineering, School of Public Health, Tehran University of Medical Sciences, Tehran, Iran;Kurdistan Environmental Health Research Center, Kurdistan University of Medical Sciences, Sanandaj, Iran;Center for Water Quality Research (CWQR), Institute for Environmental Research (IER), Tehran University of Medical Sciences, Tehran, Iran;Center for Solid Waste Research (CSWR), Institute for Environmental Research (IER), Tehran University of Medical Sciences, Tehran, Iran

关键词: Ultrafiltration;    Natural organic matter;    Fouling;    Carbon nanotube;    Membrane;   

Others  :  1216876
DOI  :  10.1186/s40201-015-0207-x

 received in 2014-11-19, accepted in 2015-05-30,  发布年份 2015

【 摘 要 】

In this study vertically aligned carbon nanotubes (VA-CNT) was grown on anodized aluminum oxide (AAO) substrate. The synthesized AAO-CNT membrane was characterized using Raman spectroscopy, field emission scanning electron microscopy (FESEM), contact angle and BET. The pure water flux, humic acid (HA) (as representative of natural organic matters) rejection and fouling mechanism were also evaluated. The fabricated membrane has pore density of 1.3 × 10¹⁰ pores per cm², average pore size of 20 ± 3 nm and contact angle of 85 ± 8^o. A significant pure water flux of 3600 ± 100 L/m².h was obtained at 1 bar of pressure by this membrane due to the frictionless structure of CNTs. High contact angle exhibited the hydrophobic property of the membrane. It was revealed that HA is primarily rejected by adsorption in the membrane pores due to hydrophobic interactions with HA. Flux decline occurred rapidly through both cross flow and dead end filtration of the HA. Based on the blocking laws, internal pore constriction is dominant fouling mechanism in which HA adsorbs in membrane pores results in pores blockage and flux decline.

【 授权许可】

   
2015 Jafari et al.

【 图 表 】

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