Adsorption of Phenol from Aqueous Solution by Activated Carbon Derived from the Pyrolysis of Waste Tires
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Date
2017-01-01
Authors
Thabalih, Diana
Abu Saif, Enas
Abu Shanab, Hala
Qteishat, Tahani
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Abstract
The production of activated carbon from waste tires and evaluate its ability for the removal of phenol from aqueous solutions in batch process is the aim of our study. The activation process was carried out by washing carbon by KOH then heated at 550°C for 2 hour under nitrogen flow rate after that washing with HCl and dried. The adsorption capacity performances of prepared carbon that washed by two solutions (water and HCl) of different particles size in this work were investigated using phenol. The kinetic adsorption study was carried out at initial concentration of phenol (30 ppm) at room temperature (25ºC) for 48 h with 0.5g carbon. The adsorption capacity was found to increase with decreasing the particle size. The results obtained show that the pseudo-second order model was the best to describe adsorption kinetic data for phenol adsorption by activated carbon with R2 value of 0.993 and adsorption capacity qm was 9.091 (mg/g), for carbon washed by water for (0.425 – 2 mm and 2 – 4 mm) particles size with R2 value of 0.998 and 0.992 and adsorption capacity qm was 7.634 and 7.194 (mg/g), respectively, and for carbon washed by HCl for (0.425–2 and 2– 4 mm) particles size with R2 value of 0.994 and 0.982 and adsorption capacity qm was 8.0645 and 6.6667 (mg/g), respectively. For phenol isotherm adsorption, the adsorption data . were fitted to Langmuir isotherm for phenol adsorption by activated carbon with R2 value of 0.957 and adsorption capacity qm was 4.281 (mg/g), for carbon washed by water for (0.425 – 2 mm and 2 – 4 mm) particles size with R2 value of 0.99 and 0.979 and adsorption capacity qm was 1.889 and 1.7006 (mg/g), respectively, and for carbon washed by HCl for (0.425–2 and 2– 4 mm) particles size with R2 value of 0.976 and 0.983 and adsorption capacity qm was 3.937 and 3.597 (mg/g), respectively. From adsorption capacity data, the carbon washed with HCl is better than the carbon washed with water but in a slightly small different which is means the washing solution has no effect on adsorption of phenol. The acetic acid adsorption was Freundlich isotherm so it is a multilayer adsorption which means the surface area measurement is hard to measured by this method. The result in this research indicated that activated carbon from waste tires was an attractive adsorbent for removal of phenol from aqueous solutions.