羧甲基化木质素在阿维菌素颗粒表面的吸附行为

doi:10.3969/j.issn.0253-2417.2015.05.008

林产化学与工业 ›› 2015, Vol. 35 ›› Issue (5): 45-52.doi: 10.3969/j.issn.0253-2417.2015.05.008

羧甲基化木质素在阿维菌素颗粒表面的吸附行为

郝汉^1,2, 陈保莹¹, 陈维韬¹, 郭鑫宇¹, 刘文君³, 吴学民¹

1. 中国农业大学应用化学系, 农业部农药化学与应用技术重点开放实验室, 北京 100193;
2. 华南理工大学化学与化工学院, 广东广州 510640;
3. 国家知识产权局化学发明审查部, 北京 100088

收稿日期:2014-09-14 出版日期:2015-10-25 发布日期:2015-10-24
通讯作者: 吴学民,教授,博士生导师,主要从事农药制剂加工研究工作;E-mail:wuxuemin@cau.edu.cn E-mail:wuxuemin@cau.edu.cn
作者简介:郝汉(1992—), 男, 山东栖霞人,硕士生,主要从事农药制剂加工研究工作
基金资助:
“十二五”国家科技支撑计划资助项目 (2011BAE06A06-10)

Adsorption Characteristics of Carboxymethylated Lignin on Avennectins Particles Surfaces

HAO Han^1,2, CHEN Bao-ying¹, CHEN Wei-tao¹, GUO Xin-yu¹, LIU Wen-jun³, WU Xue-min¹

1. Key Laboratory of Pesticide Chemistry and Application Technology, Ministry of Agriculture, Department of Applied Chemistry, China Agricultural University, Beijing 100193, China;
2. College of Chemistry and Chemical Engineering, South China University of Technology, Guangzhou 510640, China;
3.The State Intellectual Property Office of P.R.C, the Ministry of Chemical Invention Review, Beijing 100088, China

Received:2014-09-14 Online:2015-10-25 Published:2015-10-24

摘要/Abstract

摘要： 通过凝胶渗透色谱、红外光谱和官能团含量测定表明经过羧甲基化改性后的碱木质素的分子质量增加,多分散性降低;分子中酚羟基含量减少,羧基含量增加。在此基础上采用振荡吸附实验研究了羧甲基化木质素(CML)在阿维菌素颗粒表面的吸附等温线、动力学和热力学。结果表明,吸附等温线符合Langmuir模型,饱和吸附量和吸附常数均随温度升高而降低,最大饱和吸附量为9.569 mg/g,0<R_L<1表明该吸附易于进行;吸附动力学符合准二级动力学方程,吸附速率常数随温度升高而增加,吸附平衡时间约为60 min;吸附热力学结果表明: ΔG_ad<0、ΔH_ad<0、ΔS_ad>0,表明该吸附为自发、放热、熵增过程;由ΔH_ad为-5.18 kJ/mol, E_a为14.23 kJ/mol可知该吸附过程属于物理吸附,主要作用力为范德华力。SEM分析表明,阿维菌素颗粒表面光滑无孔型结构,吸附CML后可有效阻止阿维菌素团聚,增加其悬浮剂物理稳定性。由此可知,CML能够在阿维菌素颗粒表面形成稳定吸附,适合作为分散剂用于阿维菌素水悬浮剂。

关键词: 阿维菌素, 羧甲基化木质素, 吸附, 动力学, 热力学

Abstract: The analysis by FT-IR, GPC and functional groups content tests indicated that carboxymethylated lignin (CML) had higher molecular weight, lower polydispersity, less phenolic hydroxyl and more carboxyl content than those of alkali lignin (AL). In order to investigate the feasibility of using CML to disperse avennectins particles in aqueous suspension, the adsorption isotherm, kinetics and thermodynamics of CML on avennectins particles surfaces were studied by batch equilibrium experiments. The results showed that the adsorption of CML was fitted to Langmuir isotherm equation, and the saturated adsorption amounts and Langmuir constants decreased with temperature increasing. The maximum saturated adsorption amount was 9.569 mg/g, and 0<R_L<1 indicated that the adsorption process was feasibility. The adsorption process followed the pseudo-second-order kinetic model with the entire adsorption, and the adsorption rate constants increased with temperature increasing. The equilibrium adsorption time was approximately 60 min. The thermodynamic parameters were obtained as ΔG_ad<0, ΔH_ad<0 and ΔS_ad>0. This indicated that the adsorption was a spontaneous, exothermic and entropy process. Theoretically, high temperature was not beneficial to the adsorption process. The values of ΔH_ad=-5.18 kJ/mol implied that Van der Waals forces were responsible for the binding of CML with avennectins. The values of E_a=14.23 kJ/mol indicated that the adsorption process was physical adsorption. The SEM showed that abamectin particle surface was smooth without hole structure. Abamectin particles adsorbed by CML could prevent particle from aggregation effectively, and increase physical stability of abamectin SC. The adsorption characteristics study demonstrated that CML was able to form stable adsorption on avermectin particles surfaces, and eligible to be used as a suspending agent in avermectin suspension.

Key words: avennectins, carboxymethylated lignin, adsorption, kinetic, thermodynamics

中图分类号:

TQ35
O647.3

郝汉, 陈保莹, 陈维韬, 郭鑫宇, 刘文君, 吴学民. 羧甲基化木质素在阿维菌素颗粒表面的吸附行为[J]. 林产化学与工业, 2015, 35(5): 45-52.

HAO Han, CHEN Bao-ying, CHEN Wei-tao, GUO Xin-yu, LIU Wen-jun, WU Xue-min. Adsorption Characteristics of Carboxymethylated Lignin on Avennectins Particles Surfaces[J]. Chemistry and Industry of Forest Products, 2015, 35(5): 45-52.

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羧甲基化木质素在阿维菌素颗粒表面的吸附行为

Adsorption Characteristics of Carboxymethylated Lignin on Avennectins Particles Surfaces

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