摘要
本文研究了CTAB微乳液凝胶对水溶液中Cr（Ⅵ）的富集效果,同时考察了CTAB及非离子表面活性剂含量、浸泡时间、操作温度、pH值等因素对O/W型CTAB微乳液凝胶富集率的影响。结果表明,O/W型CTAB微乳液凝胶能有效地富集水溶液中的Cr（Ⅵ）;CTAB含量越高,凝胶富集率越大;非离子表面活性剂Tween 80和Span 60均能使凝胶富集率增大,相同含量下前者的增大幅度要大于后者;处理8 h凝胶富集达到平衡;凝胶富集率在低于25℃范围内随温度的升高逐渐增大,当Cr（Ⅵ）溶液pH值控制在2.6~10.6内时随pH值的升高而逐渐降低,在中性盐水溶液中随盐浓度的增大稍微降低。在22℃时使用CTAB含量为4.5%、EM中含25%Tween 80的O/W型CTAB微乳液凝胶处理pH值为4.4的Cr（Ⅵ）溶液8 h,凝胶富集率为23.3 mg/g。
Study was made on the enrichment efficiency of Cr（Ⅵ） in water with CTAB microemulsion-based gel（MBG） and the effects of some factors,such as the content of CTAB and nonionic surfactant,disposing time,temperature,pH and the concentration of different neutral salts,were investigated on the enrichment rate of O/W CTAB MBG.The results showed that CTAB MBG which was formed with oil-in-water microemulsion could effectively enrich Cr（Ⅵ） in water.The more the CTAB content was,the higher the enrichment rate of O/W CTAB MBG would be.Both of Tween 80 and Span 60 could increase the enrichment rate and the increase amplitude of the former was obviously higher than that of the latter when their contents were same.After disposed 8h,MBG got its enrichment balance.The enrichment rate would increase gradually with the increase of temperature when controlled under 25 ℃ or decrease gradually with the increase of pH of Cr（Ⅵ） solution in the range from 2.6 to10.6 or with the increase of the concentration of neutral salts.When the content of CTAB in MBG and that of Tween 80 in EM,the temperature,disposing time and pH were 4.5%,25%,22 ℃,8 h and 4.4,respectively,the enrichment rate of O/W CTAB MBG would be 23.3 mg/g.
出处
《山东农业大学学报（自然科学版）》
CSCD
北大核心
2011年第2期249-254,共6页
Journal of Shandong Agricultural University：Natural Science Edition
