三甲基木质素季铵盐/膨润土缓释剂的制备及性能

摘要

In order to enhance the added value of lignin products, the slow release formulation based on lignin derived trimethyl quaternary ammonium salt / bentonite( L-Bt) was synthesized with using sodium-based bentonite as a raw material and trimethyl quaternary ammonium lignin ( T-QL) as the modification agent. Hymexazol was selected as a simulate pesticide. The adsorption and slow release performance of L-Bt formulation for hymexazol were investigated. The structure and basal spacing of modified bentonite were analyzed by FT-IR and XRD. The results showed that quaternary ammonium ion was successfully loaded on bentonite. The modification caused the expansion of the interlayer domain of bentonite, and led to the increase of the basal spacing. The optimum adsorption conditions for hymexazol were L-0. 8Bt ( the T-QL dosage was 0. 8 times of cation exchange capacity (CEC) of bentonite), the dosage of L-0. 8Bt 0. 06 g, adsorption time 10 h, mass concentration of hymexazol 500 mg/L and pH value of 4. Additionally, the effect of potion proportion and temperature on the cumulative release rate of L-0. 8Bt with the maximum adsorption capacity 281 mg/g was studied by water soluble method. The result showed that Accumulative drug release rate increased gradually with the increase of loading drug ratio and temperature.%为提高木质素产品的附加值,以钠基膨润土为原料,三甲基木质素季铵盐( T-QL)为改性剂,制备了三甲基木质素季铵盐/膨润土( L-Bt)缓释剂；并以恶霉灵作为模拟农药,考察了L-Bt缓释剂对恶霉灵的吸附性能及缓释性能。利用FT-IR表征了其结构,采用XRD分析了改性后膨润土的底面间距。结果表明：季铵离子已成功负载到膨润土上；改性后的膨润土引起层间域的膨胀,层间距增大。改性膨润土缓释剂最佳制备工艺条件为：T-QL用量为膨润土阳离子交换容量0.8倍的改性膨润土(L-0.8Bt),L-0.8Bt的投加量为0.06 g,吸附时间10 h,恶霉灵初始质量浓度为500 mg/L,pH值为4时,其最大吸附量为281 mg/g。通过水溶缓释实验研究了药水比例和温度对载药量为281 mg/g 的L-0.8Bt缓释性能的影响,结果表明,随着药水比例的增加和温度的升高,其累计释药率均逐渐增加。