“ OPTIMISATION OF SULFURIC ACID CONCENTRATION FOR ENHANCED FE2+ ION REMOVAL USING ACTIVATED CHARCOAL FROM BOILED PEANUT SHELLS: CHARACTERISATION AND PERFORMANCE EVALUATION ”. 2024. Lingkar: Journal of Environmental Engineering 5 (1): 10-18. https://journal.ar-raniry.ac.id/index.php/lingkar/article/view/5080.