Setyopratomo, P., R. A. Agustriyanto, and A. Y. Widianto. “THE EFFECT OF THERMAL AND CHEMICAL ACTIVATION ON RIVER SAND FOR THE REMOVAL OF METHYLENE BLUE DYES BY ADSORPTION”. Jurnal ATMOSPHERE, Vol. 7, no. 2, Oct. 2026, pp. 1-8, doi:10.36040/atmosphere.v7i2.18914.