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

作　　者：RUAN XiuXiu SUN Peng OUYANG XingXing QIAN GuangRen 

机构地区：[1]School of Environmental and Chemical Engineering, Shanghai University, Shanghai 200444, China

出　　处：《Chinese Science Bulletin》2011年第32期3431-3436,共6页

基　　金：supported by the National Natural Science Foundation of China (20907029);the Innovative Project of Shanghai Municipal Education Commission (10YZ07);the Key Subject of Shanghai Municipality (S30109)

摘　　要：A series of calcium aluminum layered double hydroxides (LDHs) modified with sodium dodecyl sulfate (SDS) (Ca/Al-SDS-LDHs) were synthesized by co-precipitation, and characterized by X-ray diffraction, Fourier transform infrared spectroscopy, and elemental analysis. The Ca/Al-SDS-LDHs enhanced sorption of nitrobenzene and naphthalene from water compared with inor- ganic LDH (Ca/Al-Cl-LDH). The sorption isotherms for sorption of organic contaminants onto the Ca/Al-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/Al-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/AlSDS-LDHs were selective for polar organic contaminants.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.

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 

分 类 号：O614.31[理学—无机化学] O647.2[理学—化学]