Removal of 4-Chlorophenol from Aqueous Solution by Al2O3 Additive Hydroxyapatite

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In this study, Al2O3 doped the hydroxyapatite (HAP) nanopowders prepared by chemical precipitation method were used as the adsorbent, and the potential of HAP nanopowders for 4-chlorophenol adsorption from aqueous solution was studied. Ca/P molar ratio in HAP is made to be 1.67. Aluminum alkoxide dissolved in isopropyl alcohol. Pure and 10% (w) Al2O3 doped HAP were calcined at 1100°C. The effect of contact time, initial phenol concentration, pH and adsorbent dosage, on the 4-chlorophenol adsorption, and the adsorption was investigated. The results showed that the HAP nanopowders possessed good adsorption ability to 4-chlorophenol. The adsorption process was fast, and it reached equilibrium in 15 min of contact. The initial phenol concentration and pH played obvious effects on the 4-chlorophenol adsorption capacity onto HAP nanopowders. Increase in the initial phenol concentration could effectively increase the 4-chlorophenol adsorption capacity. At the same time, increase in the pH also resulted in the decrease in the 4-chlorophenol adsorption capacity. Increase in the HAP dosage could effectively increase the 4-chlorophenol adsorption percent. The maximum phenol adsorption capacity was obtained as 10.03 mg/g for 200 mg/L initial phenol concentrations at pH 6.4. The Freundlich isotherm were the best choices to describe the adsorption behaviors. FT-IR, XRD, SEM-EDX, DTA-TGA were applied to the characterization techniques for before and after HAP adsorption.

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Hydroxyapatite , Alumina , Adsorption , 4 , chlorophenol, removal of phenol

Afyon Kocatepe University Journal Of Science an‎d Engineering

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Afyon Kocatepe University Journal Of Science an‎d Engineering