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Enhancement Of Phosphate Removal From Water By TiO2/Yemeni Natural Zeolite: Preparation, Characterization And Thermodynamic

Aref Alshameri, Chunjie Yan, Xinrong Lei
Published 2014 · Chemistry

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Abstract In order to develop an effective technique for enhancing the efficiency of phosphate ion (PO 4 3− ) removal, a novel composition of TiO 2 /Zeolite (TZ) adsorbent was prepared and investigated systematically. The characteristics of TZ and its mechanism for PO 4 3− removal were investigated and compared with that of natural zeolite (NZ). Important parameters which affect adsorption, such as contact time, pH, dosage, temperature, initial PO 4 3− concentration and the presence of competing anions were investigated. Almost 100% removal efficiency was achieved by the TZ composite at low initial PO 4 3− concentrations. The specific surface area and PO 4 3− adsorption capacity of the composite material reached 166.5 m 2 /g and 37.6 mg/g, respectively. Moreover, Maximum adsorption occurred at around pH 2–4 and 35 °C. The results of zeta potential, FTIR, XRF and EDS analyses indicated that electrostatic attraction and replacement of surface hydroxyl groups (T/OH) by phosphate were the main adsorption mechanism. Arsenate and silicate markedly decreased the removal of PO 4 3− whereas the effect of other anions was insignificant. The adsorption isotherm results illustrated that Freundlich model (FM) provided the best fit for the equilibrium data. In addition to that, the change in free energy (Δ G ○ ), enthalpy (Δ H ○ ) and entropy (Δ S ○ ) revealed that the adsorption of PO 4 3− ion by zeolite is spontaneous and endothermic at 25 and 35 °C. It was concluded that a TiO 2 /Zeolite composite is a highly efficient and economic adsorbent material with good regeneration and can be utilized in the remediation of environmental pollution.
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