Characteristics and mechanisms of sorption of organic contaminants onto sodium dodecyl sulfate modified Ca-AI layered double hydroxides

• 来源期刊: 中国科学通报(英文版)
• 学科: 化学
• 关键词: 层状双金属氢氧化物 十二烷基硫酸钠 有机污染物 吸附特性 修改 傅里叶变换红外光谱 机制 LDHs
• 年，卷（期）: 2011,（32）
• 页码范围: 3431-3436
• 页数: 6页
• 分类号: O614.31
• 语种: 中文

摘要

A series of calcium aluminum layered double hydroxides (LDHs) modified with sodium dodecyl sulfate (SDS) (Ca/A1-SDS- LDHs) were synthesized by co-precipitation, and characterized by X-ray diffraction, Fourier transform infrared spectroscopy, and elemental analysis. The Ca/A1-SDS-LDHs enhanced sorption of nitrobenzene and naphthalene from water compared with inor- ganic LDH (Ca/A1-C1-LDH). The sorption isotherms for sorption of organic contaminants onto the Ca/A1-SDS-LDHs were linear for the concentration range tested, which implies that the sorption mechanism is mainly by partition. The sorption of naphthalene onto Ca/A1-SDS-LDH was apparently stronger than that of nitrobenzene, but this order reversed after eliminating the hydrophobic effect of these two contaminants. Because naphthalene is non-polar and nitrobenzene is polar, the results indicate that the Ca/A1- SDS-LDHs were selective for polar organic contaminants.