Adsorption of trihalomethanes from water with carbon nanotubes.
Commercial carbon nanotubes (CNTs) were purified by acid solution and were employed as adsorbents to study adsorption of trihalomethanes (THMs) from water. The properties of CNTs such as purity, structure and nature of the surface were greatly improved after acid treatment which made CNTs become more hydrophilic and suitable for adsorption of low molecular weight and relatively polar THM molecules. The adsorption of THMs onto CNTs fluctuates very little in the pH range 3-7, but decreases with pH value as pH exceeds 7. A comparative study between CNTs and powdered activated carbon (PAC) for adsorption of THMs from water was also conducted. The short time needed to reach equilibrium as well as the high adsorption capacity of CHCl3, which accounts for a significant portion of THMs in the chlorinated drinking water, suggests that CNTs possess highly potential applications for THMs removal from water.
Lu
Chungsying
C
Department of Environmental Engineering, National Chung Hsing University, 250 Kuo Kuang Road, Taichung, Taiwan. clu@dragon.nchu.edu.tw
Chung
Yao-Lei
YL
Chang
Kuan-Foo
KF
D000327:Adsorption; D002725:Chloroform / Q000737:chemistry; D006863:Hydrogen-Ion Concentration; D037742:Nanotubes, Carbon / Q000737:chemistry*; D013499:Surface Properties; D013997:Time Factors; D022882:Trihalomethanes / Q000302:isolation & purification*; D014873:Water Pollutants / Q000302:isolation & purification*; D014881:Water Supply / Q000032:analysis*
D037742:Nanotubes, Carbon; D022882:Trihalomethanes; D014873:Water Pollutants; D002725:Chloroform