Oil Shale of Rif region: natural adsorbents for environmental cleaningLarbi El Hammari, Souhayla Latifi, Asmae Gouza, Omar Boukra, Sanaa Saoiabi and Ahmed SaoiabiE3S Web Conf., 336 (2022) 00002DOI: https://doi.org/10.1051/e3sconf/202233600002