In this work, the phenol adsorption behavior on thermal modified AC samples has been studied and the major conclusions from the test results can be summarized as follows.
In comparison with the raw sample, the thermal modification at temperature range of 700–1100 °C can improve the phenol adsorption capacity. Theporemorphology and surface chemistry property analyses confirm that the enhancement of phenol adsorption is attributed to the decrease in oxygen-containing functional groups on AC sample. The π–π dispersion force interaction can explain mechanism of thermal modification. For the test temperature range between 700 and 1100 °C, the optimum modification temperature is 900 °C and the maximum phenol adsorption capacity of the obtained AC sample can reach 144.93 mg·g− 1 which is higher than that of the raw sample, i.e. 119.53 mg·g− 1. For the raw and the optimum modified AC samples, the pseudo-second order kinetics and Langmuir models are found to fit theexperimental kinetics and equilibrium data very well, respective- ly. Thermodynamics study shows that the phenol adsorption on the optimum modified AC sample is exothermic and mainly via physical adsorption.
In this work, the phenol adsorption behavior on thermal modified AC samples has been studied and the major conclusions from the test results can be summarized as follows.In comparison with the raw sample, the thermal modification at temperature range of 700–1100 °C can improve the phenol adsorption capacity. Theporemorphology and surface chemistry property analyses confirm that the enhancement of phenol adsorption is attributed to the decrease in oxygen-containing functional groups on AC sample. The π–π dispersion force interaction can explain mechanism of thermal modification. For the test temperature range between 700 and 1100 °C, the optimum modification temperature is 900 °C and the maximum phenol adsorption capacity of the obtained AC sample can reach 144.93 mg·g− 1 which is higher than that of the raw sample, i.e. 119.53 mg·g− 1. For the raw and the optimum modified AC samples, the pseudo-second order kinetics and Langmuir models are found to fit theexperimental kinetics and equilibrium data very well, respective- ly. Thermodynamics study shows that the phenol adsorption on the optimum modified AC sample is exothermic and mainly via physical adsorption.
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