The purpose of this research is trying to investigate using nano metal-granular activated carbon (NM-GAC) for removal of humic substance and heavy metals from wastewater. Three NM-GACs were prepared in this research, namely, nano Fe-GAC (NF-GAC), nano Zn-GAC (NZ-GAC) and nano Al-GAC (NA-GAC). Among these MN-GACs, NA-GAC has highest Pb(II) adsorption capacity and NF-GAC has better adsorption for Cu(II) and Cd(II). The heavy metal adsorption capacity for various NM-GAC are Pb(II) > Cu(II)> Cd(II). In binary metal systems, the sequence of affinity is Cu(II) > Pb(II) > Cd(II).
The present of Cu(II) improved the adsorption amount of humic acid(HA) and fulvic acid(FA), but reduced the adsorption amount of non-humic substance (NHS). The present of HA did not increase the Cu(II) removal, but the present of FA and NHS increase the removal amount of Cu(II). This might due to the formation of FA-Cu(II) and NHS-Cu(II) complex, and this complex was favored to be adsorbed.
Among four binary models (Langmuir、Freundlich、IAST models and Sips) investigated in this research, IAST was the best fit model.