【作者】 王洁； 范雅珣； 王洪亮； 王毅琳；

【Author】 Jie Wang;Yaxun Fan;Hongliang Wang;Yilin Wang;Center of Biomass Engineering, College of Agronomy and Biotechnology, China Agricultural University;CAS Key Laboratory of Colloid, Interface and Chemical Thermodynamics, Institute of Chemistry, Chinese Academy of Sciences;

【机构】 生物质工程中心中国农业大学农学院； 胶体界面与化学热力学中科院重点实验室中国科学院化学研究所；

【摘要】 木质素是除纤维素外第二丰富的可再生生物质资源,具有独特的苯丙烷结构单元以及奎宁、醌式结构等发色基团,有着良好的抗紫外和抗氧化性质。木质素磺酸钠是木质素的一种衍生物,是工业亚硫酸盐法制浆的主要副产物,可被视为一种阴离子聚电解质,具有良好的吸附性和分散性。同时,聚电解质与带有相反电荷的表面活性剂通过静电相互作用可构筑形成具有富集作用的液液相分离体系,该相态已在物质包藏、废水处理、药物传输、化妆品制剂等方面被广泛应用。本研究拟利用阳离子表面活性剂与木质素磺酸钠在水溶液中构筑液液相分离体系,作为一种农药稳定剂,以实现对农药的富集及缓释作用,并可抵抗紫外照射防止农药失效。浊度滴定实验结果显示,保持木质素磺酸钠浓度不变,随着水溶液中阳离子表面活性剂浓度升高,体系浊度变大,其与木质素磺酸钠通过静电作用形成的聚集体逐渐增大,但易形成沉淀。通过加入无机盐和非离子表面活性剂,可以减弱木质素磺酸钠与阳离子表面活性剂间的静电作用,同时形成更大的胶束,光学显微镜下可观察到木质素磺酸钠与阳离子表面活性剂构筑的液液相分离体系。更多还原

【Abstract】 Lignin is the second abundant renewable biomass except cellulose. It has unique phenpropane units. Lignin presents excellent UV-absorbing and antioxidant properties due to its chromophores such as quinine and quinone. Sodium lignosulphonate is main by-product of pulping and paper-making industry as derivative of lignin. It has the advantages of good absorbability and dispersibility as a kind of anionic polyelectrolyte. Meanwhile, some polyelectrolytes and oppositely charged surfactants can form coacervate through electrostatic interaction. Coacervate has strong accumulation effect, so it has been widely used in material loading, wastewater treatment, drug delivery and cosmetics fields. In the present work, we construst coacervate by sodium lignosulphonate and cationic surfactants in aqueous solution. The coacervate can accumulate and controlled release pesticides, and protect pesticides from degradation under UV irradiation as stablizer of pesticide. The trubidity titration results show that the turbidity increases grudually with increasing cationic surfactant concentration at the fixed concentration of sodium lignosulphonate, which indicates that the size of the mixed aggregates becomes larger at higher cationic surfactant concentration through electrostatic interaction. In this case, however, preciptate is formed directly with only sodium lignosulphonate and cationic surfactant. With addition of salt and nonionic surfactant, electrostatic interaction beween sodium lignosulphonate and cationic surfactant can be suppressed and the growth of aggregate is promoted. Under optical microscope, the droplets of a few micrometers formed by sodium lignosulphonate and cationic surfactant can be observed.更多还原