ADSORPTION OF PETROLEUM HYDROCARBON BY MODIFIED WALNUT SHELL

In order to study the adsorption efficiency of petroleum hydrocarbon by chemical modified walnut shell，this paper used modified walnut shell as adsorbent and discussed the effects of initial pH value，adsorption time and temperature on the process． The results showed that the maximal adsorption capacity was up to 12. 57 mg /g under the conditions of pH of 7. 0， adsorption time of 80 min，temperature of 298 K and 0. 2 g of modified walnut shell mixed with 100mL of 60 mg /L diesel solution． The pseudo-second order kinetic model could provide a better correlation to the adsorption，the coefficient was 0. 9999． The isothermal adsorption was tested under the three temperature ( i． e． 298，308，318 K) ，freundlich model was more suitable to describe the process rather than Langmuir model． The thermodynamics values indicated that the adsorption process was endothermic and spontaneous． To some extent，the adsorption capacity enhanced with the increasing of temperature．