1 research outputs found
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