Open AccessAlginate-chitosan hydrogel as controlled release of NPK macronutrient
Author(s) -
Adhitasari Suratman,
Adellia D. Oktaviani,
Nurul Hidayat Aprilita,
Atmanto Heru Wibowo
Publication year - 2019
Publication title -
iop conference series. materials science and engineering
Language(s) - English
Resource type - Journals
eISSN - 1757-899X
pISSN - 1757-8981
DOI - 10.1088/1757-899x/578/1/012074
Subject(s) - chitosan , fourier transform infrared spectroscopy , swelling , controlled release , chemistry , nuclear chemistry , potassium , self healing hydrogels , polymer chemistry , chemical engineering , organic chemistry , engineering
Alginate-chitosan hydrogel as controlled release of Nitrogen, Phosphorus, and Potassium (NPK) macronutrient has been studied. Variations of alginate and chitosan mass, N; P and K concentration, pH solution, swelling ratio and mass ratio of alginate and chitosan were optimized. Hydrogel was prepared by mixing alginate, chitosan and CaCl 2 as a cross linker in the water media. Hydrogel product was characterized by Fourier Transform Infrared (FTIR). N; P; and K release were measured by UV-Vis spectrophotometer and Atomic Absorption Spectrophotometer (AAS). The result showed that addition of chitosan in the hydrogel caused a decrease of swelling ratio hydrogel and a decrease of N; P and K release. The release of N; P and K was affected by N; P and K concentration and pH solution. The higher N; P and K concentrations and lower pH solution caused an increase of release rate of N; P and K. The mechanism of N; P and K release from the alginate-chitosan hydrogel followed the Korsmeyer-Peppas model. The ratio of alginate and chitosan in the hydrogel also affected to the the release rate of N; P and K.