Abstract

Abstract Natural zeolite coated with titanium dioxide (TiO 2 ) was used as an adsorbent to rapidly remove humic acid (HA) from an aqueous solution. Coating TiO 2 onto zeolite markedly improved its efficiency in adsorbing HA: most of the bulk organic matter (80%) could be removed within 5 min of adsorption by the zeolite/TiO 2 particles at neutral pH, whereas less than 20% was removed by bare zeolite alone. In addition, immobilisation of TiO 2 onto zeolite permitted easier separation of the adsorbent from the treated water. Photocatalytic properties of TiO 2 were exploited for the regeneration of the adsorbent. The adsorbent was shown to be readily regenerated by photocatalytic oxidation and was still effective in removing HA after 5 adsorption/regeneration cycles. These results indicate that TiO 2 -coated zeolite can be a very attractive adsorbent for the rapid removal of HA from aqueous solutions.

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