http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
A new approach to modification of an agro-based raw material for Pb(II) adsorption
Muhammad Salman,Makshoof Athar,Umar Farooq,Sadaf Rauf,Umy Habiba 한국화학공학회 2014 Korean Journal of Chemical Engineering Vol.31 No.3
This paper describes a relatively new and effective modification with thiourea of an agro-based raw material,sorghum biomass for adsorption of Pb(II) ions. The modification was done under microwave irradiation. Changes incharacteristics of modified material were determined by FT-IR and CHNS analysis. Effect of adsorbent dosage, contacttime, solution pH and temperature on equilibrium process was extensively studied. Famous equilibrium models (Langmuir,Freundlich, Temkin, Dubinin-Radushkevich) in non-linear fashion were applied to evaluate the equilibrium data usingdifferent initial concentrations of Pb(II) ranging from 20 mg/L to 300mg/L. The adsorption process followed the pseudosecond-order kinetics. This paper also discusses the thermodynamic parameters (free energy, enthalpy and entropy)and reveals that the adsorption process is spontaneous. An appreciable increase in adsorption capacity of the modifiedadsorbent was observed, depicting the advantages of thiourea modification of sorghum biomass under microwave irradiation.