Process investigation of ion sorption of complex compounds made by chromium, zinc, nickel and cobalt contained in wastewater bentonite clayNigora Mukhtorova, Bokhodir Aliev, Baxtiyor Sabirov, Uktam Umirov, Aziza Shokhakimova and Yorkinjon ErgashevE3S Web Conf., 497 (2024) 03046DOI: https://doi.org/10.1051/e3sconf/202449703046