有机粘土矿物对水中菲蒽混合物的吸附

选用长碳链季铵盐阳离子型表面活性剂十六烷三甲基溴化铵(HDTMA-Br)作为改性剂对天然粘土矿物进行改性。利用改性后的粘土矿物对混合污染物进行吸附/解吸实验,结果显示:HDTMA改性粘土矿物对混合溶液中菲、蒽及混合物的吸附等温线均呈线性,是分配作用结果;随着改性土用量的增加,其吸附量逐渐减小,对污染物的去除率逐渐增大,最后趋于平衡;有机粘土矿物吸附混合污染物后解吸率均在5%以下;将改性土对混合污染物的吸附与对单体污染物的吸附进行对照,改性土总的吸附量大大增加,基本是对单体污染物的吸附量之和。

Cosorption of Phenanthrene-anthracene Mixture from Water on Organoclay

Hexadecyltrimethylammonium bromide (HDTMA-Br) was chosen as surfactant for modifying natural clay. Results of sorption/desorption experiments showed that adsorption isotherm curves for phenanthrene, anthracene and their mixture in mixed solution on HDTMA modified clay were all linear which indicated that the sorption was affected dominantly by partition. Along with the increase of organoclay's quantity, the equilibrium adsorption capacities of organoclay fell while the adsorption efficiencies rose and became equal at last. The desorption proportions for pollutants adsorbed on organoclay were below 5 percent. The sorption for single phenanthrene and single anthracene on organoclay, and the cosorption for their mixture were also contrasted. It was found that total adsorption capacity of organoclay increased largely and was almost the sum of the capacities of organoclay adsorbing phenanthrene and anthracene respectively. It is concluded that HDTMA modified clay has both strong adsorption and stability for mixed contaminants.