INTRODUCTION Pollution is one of the main problems that cause an imbalance in the ecosystem and threaten human life, so nowadays it is necessary to have clean water in large quantities of sewage. 1,2 Water pollution is increasing in all industrialized countries, as it afects the human system, as it was found that the most dangerous and toxic compounds, such as heavy metals, medicines, oils and dyes, where organic dyes were produced in many diferent local industries such as textiles, papers, plastics, foodstufs and cosmetics. Where the use of these harmful pollutants has led to the pollution of water and the environment, where there are several ways to treat these dangerous pollutants. 3,4 Diferent technique like, precipitation, ozonation, oxidation, ion exchange, membrane filtration, coagulation, reverse osmosis, photo-catalytic Dyes are among the most important and dangerous toxic pollutants found in drinking water, as very large quantities of liquid waste containing dyes are discharged. About 10–15% of the dyes are discharged during dyeing fabrics, textiles and papers every year. 5-8 The water containing the liquid waste of dyes is very irritating as it blocks the passage of sunlight and causes disturbance to the aquatic ecosystem and living organisms. 9-11 This study used SA-g-(PAA-co-AM)/CdS hydrogel as an efective adsorbent in de-colorization dye from an aqueous solution. Several factors afecting the advanced oxidation processes were studied, like the efect of concentration MR dye, mass of SA-g-(PAA-co-AM)/CdS hydrogel catalyst, and light intensity. Experimental Part Preparation SA-g-(PAA-co-AM)/CdS Nano-composite Preparation of hydrogel nanocomposite that have 0.5 g in 500 mLfrom sodium alginate (SA) and 0.1 g of CdS with stirring 1-hour at 25 o C , and added 3 mL of acrylic acid (AA), 0.5 g acryl amide AM in 5 mL DW and stirring for 10 minutes, then added 0.03 g KPS ,0.05 g MBA in 1-mL DW, processes take place in the presence of N2 to form free radicals, put in a water bath for 4hr at 75 o C. The SA-g-(PAA-co-AM)/CdS nanocomposite cut, and washed several times and dried in an oven at 60°C about 24 hours (Figure 1). Experiments of the Photocatalytic The photocatalytic activity of the SA-g-(PAA-co-AM)/CdS Nanocomposite catalyst was estimated via the degradation of MR dye. ABSTRACT The photocatalytic method to remove the color of methyl red (MR) dye from aqueous solutions in the presence of SA-g-(PAA- co-AM)/CdS hydrogel has been studied with the utilization of artifcial UV-A light source. The properties of the hydrogel /Csd were studied using techniques (FESEM, TEM, and TGA).The efects of several factors, like time of irradiation, amount of SA-g-(PAA-co-AM)/CdS hydrogel, initial concentration of MR dye onto photo-catalytic degradation, were studies . The rate of de-colorization was found to increase remarkably with increased time of irradiation. Under best conditions from pH=5.4 and temperature at 25°C , the extent of removal color of MR dye was 100% after 1hr of irradiation at a concentration 15 mg/L. And found the initial rise in rate of MR degradation with increase in quantity of SA-g-(PAA-co-AM)/CdS hydrogel is due to an increase in number of active sites on the hydrogel of photocatalyst the rate of degradation, and photodegradation capacity is rising with increasing light intensity. Keywords: Advanced oxidation processes, Dye, Hydrogel, Methyl red, Photocatalytic. International Journal of Pharmaceutical Quality Assurance (2023); DOI: 10.25258/ijpqa.14.1.29 How to cite this article: Aljeboree AM, Fared RW, Al-wahed HMA, Jawad MA, Alkaim AF. Role of SA-g-(PAA-co-AM)/ CdS Hydrogel: As Photocatalytic for Decolonization Methyl Red Dye as a Pollutant from Aqueous Solution. International Journal of Pharmaceutical Quality Assurance. 2023;14(1):171-174. Source of support: Nil. Confict of interest: None Role of SA-g-(PAA-co-AM)/CdS Hydrogel: As Photocatalytic for Decolonization Methyl Red Dye as a Pollutant from Aqueous Solution Aseel M. Aljeboree 1 , Rose W. Fared 2 , Haneen M. Abd Al-wahed 3 , Mohammed A. Jawad 4 Ayad F. Alkaim 5* 1-3,5 Department of Chemistry, College of Sciences for Women, University of Babylon, Iraq 4 Al-Nisour University College, Iraq Received: 15 th January, 2023; Revised: 20 th February, 2023; Accepted: 10 th March, 2023; Available Online: 25 th March, 2023 RESEARCH ARTICLE *Author for Correspondence: alkaimayad@gmail.com