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Abstract
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The present work studies the adsorptive removal of methylene blue (MB) dye from
aqueous solution using a novel biocompatible adsorbent based on hydroxypropyl
cellulose (HPC) and itaconic acid nanogels. The biocompatible adsorbent was characterized
using scanning electron microscopy, Fourier transform infrared spectroscopy
and dynamic light scattering analyses. Response surface methodology was
used to modeling and optimization of the adsorption process. A second-order empirical
relationship between adsorption capacity and independent variables (pH of the
solution, contact time and dye concentration) was obtained. The results of design
of experiments demonstrated that the predicted values were well fitted with the
experimental data where coefficient of determination (R2) equaled 0.9861. Pareto
analysis for identification of the factors effect on the system revealed that the initial
concentration of MB was the most effective parameter. Maximum removal efficiency
(99.9%) was achieved at optimum parameters where pH, MB concentration,
and contact time were 5.6, 130 mg L−1, and 5 min, respectively. Furthermore, the
adsorption experimental data were well fitted to the Temkin isotherm and pseudosecond-
order kinetic model. Consequently, it was found out that the HPC–PIA nanogels
with high adsorption capacity (nearly 761 mg g−1) can be a suitable adsorbent
for removal of cationic dyes from textile colored wastewaters.
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