INTRODUCTION Hydrogels are polymer chains with hydrophilic cross-linking that may hold fluids for prolonged periods. As a result, hydrogels are employed in a variety of industries, including agriculture, medicine delivery, diapers, and adsorbent material. 1-3 The use of polysaccharide-based hydrogels as adsorbents has various benefts, including strong adsorptive, recovery capabilities, and biodegradability. 4,5 Cellulose, chitin, chitosan, alginate, xanthan gum, and carrageenan are some of the polysaccharides that have been utilized to make hydrogels. Hydrogels have been utilized to get rid of many contaminants such as dyes, heavy metals, and organic pollutants due to their high adsorption ability. Hydrogels often contain polar or ion functional groups, while dyes are mostly ionic (positive or negative), and three mechanisms often explain dye adsorption on gels depending on the chemical nature of the dye and hydrogels. 6-8 These are Electrostatic overlaps between the diferent functional aggregates of the charge for both dye and hydrogel, Hydrogen afnity between dye and hydrogel, and non-waterproof overlaps between the non-polar components of both dye particles and hydrogel. 9,10 In this study, application of SA-g-PAAc hydrogel by synthesis polymerization of free radicals, x-ray crystallography (XRD) and feld emission scanning electron microscopy (FESEM) was utilized to characterize the materials as they were produced. The usage of nano-composite as adsorbents for removing RB dye from an aqueous medium was thoroughly investigated. The adsorption process of the adsorbents was investigated using adsorption kinetics. ABSTRACT Hydrogels are considered one of the most important polymers, with very low economic costs for treating dyes from an aqueous solution. In this study, sodium alginate (SA), a kind of polysaccharide, and acrylic acid is an organic compound, N’-Methylene- bis-acrylamide (MBA) as a cross-linked agent, were used to prepare the hydrogel by free radical method. Studies have shown that sodium lignite-based nano-hydrogel is environmentally friendly, more cost-efective and highly efcient in remove dye in aqueous solution. The hydrogel adsorption characteristic was analyzed via scanning electron microscope (SEM). The data appear that the surface contains many pores and has a sponge-like structure. also the results showed that the hydrogel is the XRD of (SA-g-PAAc) a wide band at 2θ = 20.52° within the calculated d = 4.21A°. Study isotherm adsorption the highest (R²=0.9903) related to the isotherm Freundlich and Kinetic model the adsorption process of Rose Bengal dye on the SA-g- PAAc hydrogel follows a second model. Keywords: Acrylic acid, Sodium alginate, Hydrogel, Adsorption, Rose Bengal dye International Journal of Drug Delivery Technology (2022); DOI: 10.25258/ijddt.12.3.05 How to cite this article: Radia ND, Mahdi AB, Mohammed GA, Sajid A, Altimari US, Shams MA, Aljeboree AM, Abdulrazzak FH. Removal of Rose Bengal Dye from Aqueous Solution using Low Cost (SA-g-PAAc) Hydrogel: Equilibrium and Kinetic Study. International Journal of Drug Delivery Technology. 2022;12(3):957-960. Source of support: Nil. Confict of interest: None Removal of Rose Bengal Dye from Aqueous Solution using Low Cost (SA-g-PAAc) Hydrogel: Equilibrium and Kinetic Study Nadher D Radia *1 , Ahmed B. Mahdi 2 , Ghufran A. Mohammed 3 , Abeer Sajid 4 , Usama S. Altimari 5 , Marwah A. Shams 6 , Aseel M. Aljeboree 7 , Firas H. Abdulrazzak 8 1 Department of Chemistry, College of Education, University of Al-Qadisiyah, Al-Qadisiyah, Iraq 2 Department of Anesthesia Techniques, Al-Mustaqbal University College, Babylon, Iraq 3 Al-Manara College For Medical Sciences, Amarah, Iraq 4 Al-Hadi University College, Baghdad, Iraq 5 Al-Nisour University College, Baghdad, Iraq 6 Technical Engineering College, Al-Ayen University, Thi-Qar, Iraq 7 College of sciences for women/ University of Babylon, Hillah, Iraq 8 Department of Forensic Evidence, College of Science, Al-Karkh University of Science, Baghdad, Iraq Received: 19 th July, 2022; Revised: 11 th August, 2022; Accepted: 07 th September 2022; Available Online: 25 th September, 2022 RESEARCH ARTICLE *Author for Correspondence: nadhir.dhaman@qu.edu.iq