Effects of Surfactants on Adsorption of Methyl Parathion by Neutral Alumina
表面活性剂对中性氧化铝吸附甲基对硫磷的影响

The sorption of methyl parathion by neutral alumina which was modified by ionic surfactants such as SDS,SDBS and CTMAB was studied. It showed that the edsorbability of alumina to methyl parathion were related to the type and concentration of surfaetant and pH of the system. The adsorbabilities of alumina on three kinds of surfaetants were different. When pH = 7, the adsorbance of SDS was the largest, but the adsorbance of CTMAB was the smallest. When pH = 4, the adsorbance of SDS or SDBS was increased, while the adsorbance of CTMAB was decreased.The adsorbability of alumina was strengthened, not weakened, by the cooperation of pollutant and anionic surfactant, while the sorpfion of methyl parathion by alumina with cationic surfactant was weakened. These features had the practical value when neutral alumina is used to remove more than one contaminants from wastewater.