Agricultural waste-derived nanoparticles for heavy metal removal from wastewater: a comprehensive review.
Heavy metal contamination of aquatic environments remains a major environmental challenge due to the persistence, toxicity, and bioaccumulative nature of metals such as Pb(II), Cd(II), Cr(VI), Hg(II), and As(V). Agricultural waste-derived nanoparticles have recently emerged as promising sustainable adsorbents because o...