Adsorption 1 Fly ash 1 Fly ash precursor 1 Heavy metals 1 Inductively coupled plasma 1 Lead compounds 1 Metal ions 1 Na-P1 synthetic zeolite 1 Na-X synthetic zeolite 1 Na-p1 synthetic zeolite Nano-structured 1 Optical emission spectroscopy 1 Pb(II) and Zn(II) removal 1 Pb(II) and zn(II) removal 1 Sodium compounds 1 Synthetic zeolites 1 Titration 1 Voltammetry 1 X ray photoelectron spectroscopy 1 X-ray photoelectron spectroscopy studies 1 X-ray photoelectron spectroscopy study, nanostructured solid 1 XPS study, nanostructured solid 1 Zeolite carbon composites 1 Zeolite-carbon composite 1 Zeolites 1 Zinc compounds 1