正电荷功能化介孔二氧化硅纳米粒子作为控制2,4-二氯苯氧基乙酸钠盐释放的纳米载体,Journal of Agricultural and Food Chemistry

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正电荷功能化介孔二氧化硅纳米粒子作为控制2,4-二氯苯氧基乙酸钠盐释放的纳米载体
Journal of Agricultural and Food Chemistry ( IF 5.7 ) Pub Date : 2017-06-30 00:00:00 , DOI: 10.1021/acs.jafc.7b01957
Lidong Cao ₁ , Zhaolu Zhou ₁ , Shujun Niu ₂ , Chong Cao ₁ , Xiuhuan Li ₁ , Yongpan Shan ₁ , Qiliang Huang ₁

Affiliation

由于其较高的水溶性和流动性，因此2,4-二氯苯氧基乙酸（2,4-D）具有很高的浸出潜能，威胁着地表水和地下水。2,4-D的控释制剂可以减轻对环境的不利影响。在本研究中，通过后接枝方法将三甲基铵（TA）基团结合到MSN上，可以轻松合成正电荷官能化的介孔二氧化硅纳米颗粒（MSN）。2,4-D钠盐（2,4-D的阴离子形式）被有效地加载到这些带正电的MSN-TA纳米颗粒中。与使用裸MSN作为单一密封剂（1.5％）相比，加载量可以大大提高到21.7％。农药的加载和释放方式对pH，离子强度和温度有响应，主要由静电相互作用主导。土壤柱实验清楚地表明，MSN–TA可以减少2、4-D钠盐的土壤淋溶。此外，这种新颖的纳米制剂对目标植物表现出良好的生物活性，而对非目标植物的生长没有不利影响。这种基于静电相互作用的策略可以广泛地应用于使用带有相反电荷的载体的带电荷农药，以减轻对环境的潜在不利影响。

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Positive-Charge Functionalized Mesoporous Silica Nanoparticles as Nanocarriers for Controlled 2,4-Dichlorophenoxy Acetic Acid Sodium Salt Release

Because of its relatively high water solubility and mobility, 2,4-dichlorophenoxy acetic acid (2,4-D) has a high leaching potential threatening the surface water and groundwater. Controlled release formulations of 2,4-D could alleviate the adverse effects on the environment. In the present study, positive-charge functionalized mesoporous silica nanoparticles (MSNs) were facilely synthesized by incorporating trimethylammonium (TA) groups onto MSNs via a postgrafting method. 2,4-D sodium salt, the anionic form of 2,4-D, was effectively loaded into these positively charged MSN-TA nanoparticles. The loading content can be greatly improved to 21.7% compared to using bare MSNs as a single encapsulant (1.5%). Pesticide loading and release patterns were pH, ionic strength and temperature responsive, which were mainly dominated by the electrostatic interactions. Soil column experiments clearly demonstrated that MSN–TA can decrease the soil leaching of 2, 4-D sodium salt. Moreover, this novel nanoformulation showed good bioactivity on target plant without adverse effects on the growth of nontarget plant. This strategy based on electrostatic interactions could be widely applied to charge carrying agrochemicals using carriers bearing opposite charges to alleviate the potential adverse effects on the environment.

更新日期：2017-07-02

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