Facile synthesis of SrO/CeO 2 /alginate nanocomposite for the photocatalytic degradation of reactive red 195 dye and CO 2 capturing Aisha a , Iqra Batool a , Afaf Almasoudi b , Shafia Iftekhar c , Syeda Aliya Shehzadi d , Ammar Zidan e , Omar Makram Ali f , Muhammad Babar Taj a,** , Shahid Iqbal g,* , Sajid Mahmood g,h,*** , Toheed Akhter i , Heba Alshater j a Institute of Chemistry, The Islamia University of Bahawalpur, Bahawalpur 63100, Pakistan b Chemistry Department, Faculty of Science, King Abdulaziz University, P.O. Box 42734, Jeddah, Saudi Arabia c Department of Chemistry, University of Sahiwal, Sahiwal 57000, Pakistan d Center of Interdisciplinary Research in Basic Sciences (CIRBS), Faculty of Sciences, International Islamic University, Islamabad 44000, Pakistan e Biomedical Engineering Department, College of Engineering and Technologies, Al-Mustaqbal University, Hillah 51001, Babil, Iraq f Department of Chemistry, College of Taraba, Taif University, Taif (Taraba), Saudi Arabia g Nottingham Ningbo China Beacons of Excellence Research and Innovation Institute, University of Nottingham Ningbo China, Ningbo 315100, China h Functional Materials Group, Gulf University for Science and Technology, Mishref 32093, Kuwait i Department of Chemical and Biological Engineering, Gachon University, Seongnam 13120, Republic of Korea j Department of Forensic Medicine and Clinical Toxicology, Menoufia University, Shbien El-Kom, Egypt HIGHLIGHTS • The SrO/CeO 2 /ALG nanocomposite was constructed by using the Co-precipitation method. • We found that strong electrostatic interaction exists in acidic media between anionic dye and SrO/CeO 2 /ALG surface. • Under sunlight irradiation, about 93 % of the photodegradation efficiency of the dye was observed within 90 min. • The prepared SrO/CeO 2 /ALG acting as a photocatalyst exhibits 4.31 and 2.98 mmol/g CO 2 capturing capacity. A R T I C L E INFO Keywords: SrO/CeO 2 /ALG Nanocomposite CO 2 capturing Reactive red 195 dye ABSTRACT The SrO/CeO 2 /ALG nanocomposite was successfully constructed by using the co-precipitation method and was analyzed with zeta potential, FTIR, SEM, XRD and BET techniques. A common Azo dye, namely Reactive Red 195, widely utilized in the dyeing industry and causing environmental pollution, was chosen to examine the photodegradation of SrO/CeO 2 /ALG nanocomposite, and it was shown that this dye could be successfully degraded by prepared nanocomposite. Impacts of factors such as pH, contact time and effect of different con- centrations of dye and catalyst, the effect of scavengers and the effect of hydrogen peroxide were investigated to find out degradation efficiency. This SrO/CeO 2 /ALG nanocomposite was used for the photodegradation of reactive red 195 dye and 93 % degradation efficiency was obtained at pH 3, 6 mg of catalyst concentration, dye concentration of 10 ppm, and contact time of 90 min. Degradation kinetic studies were determined by applying first-order and Langmuir-Hinshelwood reactions. The results exhibit a novel method for the synthesis of nano- composite to effectively cause photodegradation of organic pollutants from wastewater and can be applied to industrial manufacture. The mesoporous SrO/CeO 2 /ALG nanocomposite also captured 4.31 and 2.98 mmol/g CO 2 at 25 and 40 ◦ C temperatures, respectively. * Corresponding author. ** Corresponding author. *** Corresponding author. Nottingham Ningbo China Beacons of Excellence Research and Innovation Institute, University of Nottingham Ningbo China, Ningbo 315100, China. E-mail addresses: dr.taj@iub.edu.pk (M.B. Taj), shahidiqbal@hzu.edu.cn (S. Iqbal), sajidmahmood1987@yahoo.com (S. Mahmood). Contents lists available at ScienceDirect Materials Chemistry and Physics journal homepage: www.elsevier.com/locate/matchemphys https://doi.org/10.1016/j.matchemphys.2024.129894 Received 1 May 2024; Received in revised form 7 July 2024; Accepted 23 August 2024 Materials Chemistry and Physics 328 (2024) 129894 Available online 24 August 2024 0254-0584/© 2024 Elsevier B.V. All rights are reserved, including those for text and data mining, AI training, and similar technologies.