Microparticles based on ionic and organosolv lignins for the controlled release of atrazine

TAVERNA, M.E; BUSATTO,C.; LESCANO, MAIA; NICOLAU, V.; C.S. ZALAZAR; MEIRA, G.; EZTENOZ, D.

JOURNAL OF HAZARDOUS MATERIALS.

ELSEVIER SCIENCE BV

Lugar: Amsterdam; Año: 2018

0304-3894

Lignins are natural polymers of the lignocellulosic biomass. Nowadays, there is a growing interest in developingvalue-added products based on lignins due to their renewability, low cost and abundance. In this work, ligninmicrospheres from organosolv and ionic isolation processes were prepared for the controlled release of atrazine.Microspheres were prepared by the solvent extraction/evaporation technique. The controlled release of atrazinefrom organosolv and ionic lignins microparticles was studied in water. Mobility experiments were performed in anagricultural soil from Argentina. The results showed that microparticles prepared using dichloromethane as thedispersed phase were spherical, while lignins dispersed in ethyl acetate produce irregular microparticles.Organosolv lignin microparticles presented higher encapsulation efficiency for all herbicide loads. About 98% and95% of atrazine was released in 24 and 48 h approximately from organosolv and ionic lignin microparticles,respectively. The release profiles of atrazine from both lignin microparticles were not affected by the herbicideload. Atrazine mobility experiments in soil showed that about 80% of free atrazine was leached in 37 days, while65.0% and 59.7% of the herbicide was leached from ionic and organosolv lignin microparticles, respectively. Thus,atrazine-loaded microparticles could reduce leaching compared to a commercial formulation of free atrazine.