Background: Water pollution due to rapid industrialization becomes a critical issue. Presence
of industrial dye in water is a major concern for scientific community.
Objective: The objective of the study was to synthesise acrylamide graft copolymers of Azadirachita
indica (neem) gum and characterized the prepared hydrogel as a flocculating agent and ineffective removal
of cationic dye methylene blue from aqueous solution.
Methods: Various batches of acrylamide graft copolymers were synthesized using microwave irradiation
and evaluated for their potential to reduce turbidity when added in 1%w/v solution of kaoline (artificial
wastewater). Application of graft copolymers in the removal of methylene blue from aqueous
solution was also evaluated.
Results: Batch N7 prepared using 0.5%w/v solution of ceric ammonium nitrate and 10 times microwave
exposure showed lowest shelf caused turbidity at the concentration level of 0.2%w/v. N7 also
showed a significant reduction in the turbidity when added in 1%w/v solution of kaoline. At the dose
level of 0.4g/l, N7 showed the maximum removal of methylene blue i.e. 93.04 (±3.3%). Adsorption
isotherm studies carried out at 25±2°C and pH 7 showed best fit to the Langmuir isotherm model with
a regression coefficient of 0.962. Adsorption of methylene blue from aqueous solution followed Pseudo
second-order kinetics model with regression coefficient 0.991. Intraparticle diffusion model easily
predicts that intraparticle diffusion was not rated limiting step for adsorption of methylene blue.
Conclusion: From the study, it can be concluded that acrylamide grafted neem gum polysaccharide
can be effectively used for the treatment of wastewater.