Application of RSM and ANN modelling techniques in the removal of Cr (VI) from aqueous solution using PANI@ Fe3O4@green moringa leaves biomass, a hybrid magnetic nanocomposite - Chakanaka P. Mungwari; Malvern Chetse; Placxedes Sigauke; Fidelis Chigondo; Munyaradzi Shumba; Refilwe Matshitse; Benias C. Nyamunda (Next Nanotechnology, 2026)