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Efficiency of Biodegradable Acrylic Acid-Chitosan Hydrogel in Eliminating Methylene Blue from Wastewater

Nazia Rahman, Nirmal Chandra Dafader, Makid Maskawat Marjub, Shahnaz Sultana, Abdur Rahim Miah, Md Nurul Abser, Utpol Chowdhury, Md Owaleur Rahman


A novel, regenerative and biodegradable acrylic acid hydrogel having different chitosan composition (w = 0, 0.5, 1.0 and 1.5 %) was
constructed using gamma radiation from the Cobalt-60 source. The prepared hydrogel was treated with alkali to enhance its dye
adsorption capacity. Uptake capability of the hydrogel at different chitosan percentage, contact time, pH, and methylene blue (MB)
concentrations was measured using UV Spectrometer. MB uptake ability obtained was found to escalate proportionately with
escalating chitosan percentage and alkali treatment. Kinetics and isotherm of MB adsorption mechanism were analyzed. Pseudosecond-
order model and Langmuir isotherm model were followed by the Hydrogel MB uptake capacity. The adsorption efficiency of
monolayer saturation of the alkali-treated adsorbent was 322 mg/g as obtained from Langmuir equation. Desorption and reuses of the
hydrogel were successfully carried out. The results indicated that acrylic acid-chitosan hydrogel is feasible for elimination of toxic
cationic dyes efficiently.
Keywords: Acrylic acid,


Acrylic acid, Chitosan, Hydrogel, Radiation, Methylene blue, Desorption

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