OPTIMIZATION OF ADSORPTION OF CONGO RED DYE FROM AQUEOUS SOLUTION WITH ACTIVATED CARBON FROM CASTOR SEED SHELL USING CENTRAL COMPOSITE DESIGN. FJS [Internet]. 2023 Feb. 28 [cited 2025 Sep. 6];7(1):271-9. Available from: https://fjs.fudutsinma.edu.ng/index.php/fjs/article/view/1308