Adsorption of organic pollutants by surfactant modified zeolite as controlled by surfactant chain length

作者：Xie, Qiang; Xie, Jie; Wang, Zhe; Wu, Deyi^*; Zhang, Zhenjia; Kong, Hainan

来源：Microporous and Mesoporous Materials, 2013, 179: 144-150.

DOI：10.1016/j.micromeso.2013.05.027

• Zeolite
• Surfactant
• Chain length
• Adsorption
• Organic pollutants

Surfactant modified zeolites are promising for decontamination of organic pollutants from water. However, the influence of chain length of surfactants on decontamination process has not been clarified to our knowledge. In this study, a natural zeolite was modified with surfactants of varying chain length (from one carbon to 22 carbons) and the adsorption of organic contaminants, including anionic (sodium form of humic acid), ionizable (phenol, p-chlorophenol and bisphenol A), and non-ionizable compounds (naphthalene) was investigated. Results showed that the amount of surfactant loaded increased with increasing chain length. Measurement of FTIR spectroscopy indicated that the surfactant chains adopted a more disordered conformation as the chain length decreases. In general, the adsorption of the organic pollutants increases as the chain length increases. We noted that long chain length, high surfactant coverage, and ordered chain conformation are driving forces for the retention of organic chemicals. The pH dependency of adsorption suggested that negatively charged groups of anionic or ionizable organic solutes interacted with positively charged head of surfactant. Furthermore, adsorption increased with increasing k(ow) value for organic pollutants, indicating that hydrophobic interaction of the benzene ring(s) of organic compounds with the carbon chain of surfactant contributes to adsorption.

• 出版日期2013-9-15
• 单位上海交通大学