木质素磺酸盐在烯酰吗啉颗粒表面的吸附特性  

Adsorption Characteristics of Lignosulfonates on the Surface of Dimethomorph

作　　者：庞煜霞[1] 刘磊[1] 楼宏铭[1,2] 易聪华[1] 邱学青[1,2] 

机构地区：[1]华南理工大学化学与化工学院,广州510640 [2]华南理工大学制浆造纸工程国家重点实验室,广州510640

出　　处：《高等学校化学学报》2012年第8期1820-1825,共6页Chemical Journal of Chinese Universities

基　　金：国家杰出青年科学基金(批准号:20925622);国家科技支撑计划项目(批准号:2011BAE06B06-3);广东省自然科学基金(批准号:8351064101000002);广东省科技计划项目(批准号:2010A080804020)资助

摘　　要：考察了常用分散剂木质素磺酸钠(Sodium Lignosulfonate,SLS)在烯酰吗啉(Dimethomorph,DMM)上的吸附性能,并测试了吸附SLS后DMM颗粒表面Zeta电位和接触角的变化,从理论上探讨了分散剂的吸附对农药颗粒表面物化性能的影响,指导农药分散剂的开发.结果显示,浓度为0～10 g/L时,SLS在DMM表面呈现双层吸附;低浓度(0～1.0 g/L)时,吸附等温线符合Langmuir方程.SLS在DMM表面上的吸附属于自发、放热吸附过程,吸附力主要包括疏水作用、范德华力和氢键作用力.SLS在DMM表面吸附后提高了其Zeta电位,且SLS磺化度越高其提高作用越明显.随着SLS溶液浓度增大,DMM在SLS溶液中的接触角先减小后增大,到70°～80°后趋于稳定.Dispersion stability of pesticide suspensions has a great impact on their application performance. The adsorption of dispersing agent on pesticide particles is the key factor of determining the stability of the suspension systems. In order to explore the action of dispersant adsorption on the physical and chemical properties of pesticides and help to develop new dispersants, the adsorption performance of common dispersant sodium lignosulfonate（SLS） on dimethomorph （DMM） was investigated, and the zeta potential and contact angle changes after adsorbing SLS on DMM particles were measured. The results showed that when the concentration of SLS was 0--10 g/L, a double-layer absorption occurred on DMM surface. With low concentration of 0- 1.0 g/L, the adsorption isotherm was agree with Langmuir equation. The adsorption of SLS on the surface of DMM is a spontaneous, exothermic process, and the interaction between SLS and DMM included hydrophobic interaction, van der Waals force and hydrogen bond. The zeta potential of DMM particles was improved after adsorbing SLS and the higher sulfonated degree of SLS, the greater of this zeta potential improvement. With the increasing of SLS concentration, the contact angle of DMM in water solution reduced firstly and then increased to 70°-80°.

关 键 词：吸附 木质素磺酸盐 烯酰吗啉 农药 分散剂 

分 类 号：O647.3[理学—物理化学]