碳纳米管对结晶紫的吸附研究

研究了碳纳米管对溶液中结晶紫的吸附性能,考察了溶液浓度、溶液p H、吸附时间和吸附温度等因素对吸附行为的影响,初步探讨了碳纳米管对结晶紫的吸附机理。结果表明,碳纳米管对结晶紫的吸附量随着溶液初始浓度的增大而升高;酸性条件有利于吸附的进行,最佳p H等于5;对结晶紫的吸附在3h达到平衡,吸附速率常数为779.76h-1;温度的变化对结晶紫的吸附量影响不大。通过Langmuir方程和Freundlich方程对吸附进行拟合,平衡吸附量Qe与平衡质量浓度Ce之间的关系符合Freundlich等温吸附方程所描述的规律,说明吸附过程以物理吸附为主。

Adsorption of crystal violet on carbon nanotubes

Carbon nanotubes (CNTs) were employed to remove crystal violet from solution. Effects of concentration of crystal violet and solution pH, the adsorption time as well as the adsorption temperature were examined. The results show that the adsorption capacity of crystal violet on CNTs increased with the increase of the concentration of crystal violet. Crystal violet could be adsorbed efficiently on CNTs in the pH range of 2-6, and pH 5 achieved the maximum of adsorption capacity. The adsorption equilibrium time of crystal violet on carbon nanotubes is 3h and the adsorption rate constant is 779.76h-1. Little influence on the adsorption capacity was observed with the change of temperature. The linear correlation coefficients of Langmuir and Freundlich isotherms were determined and the results revealed that Freundlich isotherm fitted the experimental results well. The mechanism of adsorption of crystal violet on CNTs is mainly physical adsorption.