Li Jia, Lin Jian-Wei, Zhan Yan-Hui, Chen Zu-Mei, Wang Peng-Jun
Huan Jing Ke Xue. 2014 Feb;35(2):611-8.
Surfactant-modified zeolites (SMZs) with different coverage types were prepared by loading of different amounts of cetylpyridinium bromide (CPB) onto natural zeolites and were used as adsorbents to remove phenanthrene from aqueous solution. The adsorption of phenanthrene from aqueous solution on monolayer and bilayer SMZs as a function of adsorbent dosage, initial phenanthrene concentration, contact time, and temperature was investigated using batch experiments. Results showed monolayer and bilayer SMZs were effective for the removal of phenanthrene from aqueous solution. The phenanthrene removal efficiency of SMZs increased with increasing adsorbent dosage, but the amount of phenanthrene adsorbed on SMZs decreased with increasing adsorbent dosage. The adsorption kinetics of phenanthrene on SMZs well followed a pseudo-second-order kinetic model. The equilibrium adsorption data of phenanthrene on SMZs at a low concentration of phenanthrene in solution could be described by the Linear equation and Freundlich equation. The main mechanism for phenanthrene adsorption onto monolayer SMZ is hydrophobic interaction, and the main mechanism for phenanthrene adsorption onto bilayer SMZ is organic partitioning. The calculated thermodynamic parameters such as Gibbs free energy change (deltaG(theta)), enthalpy changes (deltaH(theta)), and entropy change (deltaS(theta)) showed that the adsorption process of phenanthrene on SMZs is spontaneous and exothermic in nature. When the CPB loading amount of bilayer SMZ was twice as much as that of monolayer SMZ, the phenanthrene adsorption capacity for bilayer SMZ was slightly higher than that for monolayer SMZ. In a conclusion, both monolayer and bilayer SMZs are promising adsorbents for the removal of phenanthrene from water and wastewater, and monolayer SMZ is a more cost-effective adsorbent for phenanthrene removal than bilayer SMZ.
通过将不同量的十六烷基溴化吡啶（CPB）负载到天然沸石上制备了具有不同覆盖类型的表面活性剂改性沸石（SMZ），并将其用作吸附剂以从水溶液中去除菲。使用间歇实验研究了水溶液中菲在单层和双层SMZ上的吸附与吸附剂用量、初始菲浓度、接触时间和温度的关系。结果表明，单层和双层SMZ对从水溶液中去除菲是有效的。SMZ对菲的去除效率随吸附剂用量的增加而提高，但吸附在SMZ上的菲的量随吸附剂用量的增加而减少。菲在SMZ上的吸附动力学很好地遵循准二级动力学模型。在溶液中菲浓度较低时，菲在SMZ上的平衡吸附数据可用线性方程和弗伦德利希方程描述。菲吸附到单层SMZ上的主要机制是疏水相互作用，菲吸附到双层SMZ上的主要机制是有机分配。计算得到的热力学参数，如吉布斯自由能变化（ΔGθ）、焓变（ΔHθ）和熵变（ΔSθ）表明，菲在SMZ上的吸附过程本质上是自发的且放热的。当双层SMZ的CPB负载量是单层SMZ的两倍时，双层SMZ对菲的吸附容量略高于单层SMZ。总之，单层和双层SMZ都是从水和废水中去除菲的有前景的吸附剂，并且单层SMZ是比双层SMZ更具成本效益的用于去除菲的吸附剂。
