Lead Sorption by Carbon Nanofibers Grown on Powdered Activated Carbon - Kinetics and Equilibrium

Abdullah Al Mamun; Yehya M. Ahmed; Ma'an Fahmi R. AlKhatib; Ahmad Tariq Jameel; Mohammed Abdul Hakeem Abdul Rahman AlSaadi

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자료유형: 학술저널

저자정보: Abdullah Al Mamun Yehya M. Ahmed Ma'an Fahmi R. AlKhatib Ahmad Tariq Jameel Mohammed Abdul Hakeem Abdul Rahman AlSaadi

저널정보: 성균관대학교 성균나노과학기술원 NANO NANO Vol.10 No.2

발행연도: 2015.1

수록면: 8 - 15 (8page)

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Carbon nanofibers (CNFs) were synthesized by using a safe and less hazardous method, compared to using floating catalysts in chemical vapor deposition (CVD) process. This process used C2H2 as carbon source and oil palm kernel shell-based powdered activated carbon (PAC) as cheap solid substrate. Use of nickel (Ni2+) impregnated PAC as fixed substrate for the synthesis of CNF is one of the novelties of the research work accomplished by the authors. The PAC–CNFs porous nanocomposite product was used for the sorption of lead ions (Pb2+) from synthetic aqueous solution. Kinetics of Pb2+ adsorption and isotherms were investigated by varying initial concentration of lead and contact time. PAC–CNFs were found to remove Pb2+ better at acidic pH of about 5.5. Langmuir and Freundlich isotherms were applied to the sorption equilibrium data to find the best fitted model. Langmuir isotherm model with R2=0.965 fitted the adsorption data better than the Freundlich isotherm. The kinetic processes of Pb2+ adsorption on CNFs were investigated by applying different kinetic models, namely zero-order, pseudo-first-order and pseudo-second-order. The pseudo-second-order rate equation exhibited the best results with R=0.999, qe=74.79 (mg/g) and K2=0.029 (min·g/mg). The novel nanocomposite product seemed to have the potential to remove Pb2+ ions from aqueous solution.

#Adsorption #initial concentration #isotherms #Langmuir #pseudo-second-order

참고문헌 (59)

참고문헌 신청

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