Kandah Munther Issa, Meunier Jean-Luc
Chemical Engineering Department, Jordan University of Science & Technology, P.O. Box 3030, Irbid 22110, Jordan.
J Hazard Mater. 2007 Jul 19;146(1-2):283-8. doi: 10.1016/j.jhazmat.2006.12.019. Epub 2006 Dec 13.
Multi-walled carbon nanotubes (MWCNTs) were produced by chemical vapor decomposition using acetylene gas in the presence of Ferrocene catalyst at 800 degrees C, and then oxidized with concentrated nitric acid at 150 degrees C. Both (as-produced and oxidized) CNTs were characterized by TEM, Boehm titration, N2-BET and cation exchange capacity techniques. The adsorption capacity for nickel ions from aqueous solutions increased significantly onto the surface of the oxidized CNTs compared to that on the as-produced CNTs. The effects of adsorption time, solution pH and initial nickel ions concentrations on the adsorption uptake of Ni2+ for both the as-produced and oxidized CNTs were investigated at room temperature. Both Langmuir and Freundlich isotherm models match the experimental data very well. According to the Langmuir model the maximum nickel ions adsorption uptake onto the as-produced and oxidized CNTs were determined as 18.083 and 49.261 mg/g, respectively. Our results showed that CNTs can be used as an effective Ni2+ adsorbent due to the high adsorption capacity as well as the short adsorption time needed to achieve equilibrium.
多壁碳纳米管（MWCNTs）通过在800℃下以乙炔气体为原料、在二茂铁催化剂存在下进行化学气相分解制备，然后在150℃下用浓硝酸氧化。采用透射电子显微镜（TEM）、 Boehm滴定法、N2-比表面积测定法（N2-BET）和阳离子交换容量技术对（原样和氧化后的）碳纳米管进行了表征。与原样碳纳米管相比，氧化后的碳纳米管对水溶液中镍离子的吸附容量显著增加。在室温下研究了吸附时间、溶液pH值和初始镍离子浓度对原样和氧化后的碳纳米管吸附Ni2+的影响。Langmuir和Freundlich等温线模型均与实验数据拟合良好。根据Langmuir模型，原样和氧化后的碳纳米管对镍离子的最大吸附量分别为18.083和49.261 mg/g。我们的结果表明，由于碳纳米管具有高吸附容量以及达到平衡所需的吸附时间短，因此可作为一种有效的Ni2+吸附剂。
