Open AccessAdsorption mechanism of azophloxine in water by Fe3O4-chitosan composite material
Author(s) -
Li Sun,
Xiaoxiang Song,
Zhigang Yuan,
Ying Liu,
Wenbang Gong,
Wei Xu,
Shunqi Mei
Publication year - 2020
Publication title -
iop conference series. earth and environmental science
Language(s) - English
Resource type - Journals
eISSN - 1755-1307
pISSN - 1755-1315
DOI - 10.1088/1755-1315/446/2/022021
Subject(s) - adsorption , chitosan , composite number , chemistry , kinetic energy , kinetics , thermodynamics , chemical engineering , materials science , composite material , organic chemistry , physics , quantum mechanics , engineering
Fe 3 O 4 -chitosan composite material was synthesized as adsorbent. The effect of solution pH value, initial concentration of azophloxine and adsorption time on the adsorption of azophloxine onto adsorbent was studied. The results show that Fe 3 O 4 -chitosan composite material can be magnetically separated before and after adsorbing azophloxine. It was found that the peak intensity of azophloxine was the strongest under weak acidic conditions, and the peak position hardly shifted. In the process of adsorption, it was found that Fe 3 O 4 -chitosan composite material adsorbing azophloxine by the surface electrostatic attraction. The optimum equilibrium adsorption capacity is at initial solution pH 6, and the equilibrium adsorption capacity is very close under weak acidic conditions. The pseudo first-order and pseudo second-order kinetic models were applied to experimental data. The adsorption process followed the pseudo-first-order kinetic model, which implied that the adsorption process was physical adsorption. The correlation coefficient for the first-order kinetic model was obtained greater than 0.99571 at room temperature, and the theoretical equilibrium adsorption capacity qe,cal value also agreed very well with the experimental equilibrium adsorption capacity q e value in the case of pseudo first-order kinetics. It is suggested that Fe 3 O 4 -chitosan composite material has a wide application prospect in the removal of dyes as adsorbent.