Jimenez-Paz, J., Lozada-Castro, J., Lester, E., Williams, O., Stevens, L., & Barraza-Burgos, J. Solutions to Hazardous Wastes Issues in the Leather Industry: Adsorption of Chromium Iii and Vi from Leather Industry Wastewaters Using Activated Carbons Produced from Leather Industry Solid Wastes