Adsorption process of heavy metals from wastewater: A comprehensive review of adsorbents and process optimization - Najlae Zaki; Asmae Charki; Oumaima Fraiha; Hossain El Ouarghi; Hassan Amhamdi; Amin Salhi; Abdellah Elyoussfi; M’hamed Ahari (Next Nanotechnology, 2026)