Adsorption of aqueous cadmium (II) onto modified multi-walled carbon nanotubes following microwave/chemical treatment

作者：Kuo Chao Yin^*; Lin Han Yu

来源：Desalination, 2009, 249(2): 792-796.

DOI：10.1016/j.desal.2008.11.023

• Microwave
• Cadmium ion (II)
• Carbon nanotubes
• Adsorption

This study evaluates the aqueous cadmium (II) adsorption efficiency of as-grown carbon nanotubes (CNTs) and of those modified by microwave (MW)/H(2)SO(4) and MW/H(2)SO(4)/KMnO(4) processes. The surface area, pH(iep), and FTIR spectra of CNTs were, before and after modification. compared. Aromatic groups, carbonyl groups and hydroxyl groups were herein detected on the surfaces of MW/H(2)SO(4) and MW/H(2)SO(4)/KMnO(4)-modified CNTs. At a particular pH, the adsorption capacity of Cd(2 ) of the MW/H(2)SO(4)/KMnO(4)-modified CNTs exceeded that of MW/H(2)SO(4)-modified CNTs and as-grown CNTs. The kinetic analyses of adsorption were performed and a pseudo second-order model accurately captured the adsorption kinetics. This study suggests that MW/H(2)SO(4) and MW/H(2)SO(4)/KMnO(4) modification not only increased the area of active adsorption sites of CNTs but also reduced the modification period by microwave heating.

• 出版日期2009-12-15