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### Preparation and Performance of Slow Release Formulation Based on Lignin Derived Trimethyl Quaternary Ammonium Salt/Bentonite

TIAN Jin-ling, REN Shi-xue, FANG Gui-zhen

1. Material Science and Engineering College, Key Laboratory of Bio-based Material Science and Technology, Ministry of Education, Northeast Forestry University, Harbin 150040, China
• Received:2014-09-10 Online:2015-10-25 Published:2015-10-24

Abstract: 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.

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