Synthesis and characterization of alumina-coated carbon nanotubes and their application for lead removal.
Alumina-coated multi-wall carbon nanotubes were synthesized and characterized by scanning electron microscopy, X-ray diffraction, and FTIR. They were used as an adsorbent for the removal of lead ions from aqueous solutions in two modes, batch and fixed bed. In the batch mode, experiments were carried out to investigate the effect of contact time, agitation speed, adsorbent dosage and solution pH on the removal of lead. The coated nanotubes exhibit better removal ability over uncoated. For fixed-bed columns, thickness of the layer and flow rate were investigated. Increasing the thickness and decreasing the flow rate enhanced the removal of lead. The prepared adsorbent displayed the main advantage of separation convenience when a fixed-bed column was used compared to the batch adsorption treatment.
Gupta
Vinod K
VK
Chemistry Department, King Fahd University of Petroleum & Minerals, Dhahran 31261, Saudi Arabia. vinodfcy@gmail.com
Agarwal
Shilpi
S
Saleh
Tawfik A
TA
D000042:Absorption; D000537:Aluminum Oxide / Q000138:chemical synthesis / Q000737:chemistry*; D004785:Environmental Pollutants / Q000302:isolation & purification*; D006863:Hydrogen-Ion Concentration; D007220:Industrial Waste; D007854:Lead / Q000302:isolation & purification*; D008855:Microscopy, Electron, Scanning; D037742:Nanotubes, Carbon / Q000737:chemistry* / Q000648:ultrastructure; D010316:Particle Size; D017550:Spectroscopy, Fourier Transform Infrared; D014961:X-Ray Diffraction
D004785:Environmental Pollutants; D007220:Industrial Waste; D037742:Nanotubes, Carbon; D007854:Lead; D000537:Aluminum Oxide