摘要
用阳离子表面活性剂十六烷基三甲基溴化铵对六种酞酸酯类化合物(五种脂肪链酞酸酯和一种苯基酞酸酯)进行了增溶性实验.结果表明,在表观浓度(Cs)小于临界胶速浓度(CMC)时,十六烷基三甲基溴化铵对四种酞酸酯(DMP和DPhP除外)有一定程度的增溶作用;当Cs大于CMC时,对六种化合物的增溶性显著增强.其增溶性(St/Sw)随Cs增大而线性递增:当Cs<CMC时,St/Sw=a+Kmn·Cs,r>0.90,n=5;当Cs>CMC时,St/Sw=a+Kmc·Cs,r>0.99,n=5. 各化合物增溶系数随各自固有水溶性(Sw)减小而增大(苯基酞酸酯有所反常),lgKmn和lgKmc与各自lgl/Sw具有良好的线性正相关性.本文进一步对增溶机理进行了分析解释.
Water solubility enhancements of six phthalic esters (5 aliphatic phthalates and one phenyl ph-thalate) by a cationic surfactant, cetyltrimethylammonium bromide (CTAB), have been studied at 25℃. While the solubilities of the 6 phthalates are significantly enhanced by the surfactant at con-centration above the critical micelle concentration (CMC), the surfactant at concentration below CMC also exhibits a degree of solubility enhancements on 4 phthalates. The solubility enhancements (St/Sw) of these phthalates are proportional to the observed concentration of the surfactant ( Cs) . When Cs> CMC, St/Sw = a + Kmc·Cs, with > 0.99, n = 5; when Cs < CMC, St/SW = a + Kmn ·Cs, with r > 0.90, n = 5. lg Kmn and lg Kmc of these phthalates correlate linearly with their respective lg 1/Sw, with phenyl phthalate aberrant a lot. Based on these data, the mecha-nism for the solubillity enhancement is provided.
出处
《环境化学》
CAS
CSCD
北大核心
2001年第4期344-350,共7页
Environmental Chemistry
关键词
阳离子表面活性剂
酞酸酯
增溶性
增溶机理
生物降解
废水处理
cationic surfactant
phthalic esters
water solubility enhancement
mechanismof solubility enhancement.