Thermodynamics of adsorption/desorption of cellulases NS 50013 on /from Avicel PH 101 and Protobind 1000
Journal Title: American journal of Engineering Research - Year 2016, Vol 5, Issue 2
Abstract
Insight from thermodynamic parameters of enthalpy (ΔH), entropy (ΔS) and Gibbs free energy (ΔG) was used to predict conditions for desorption of cellulases from wheat straw. The analogues of the cellulose and lignin components of wheat straw used were Avicel PH 101 and Protobind 1000, respectively. The ΔHa for adsorption on Avicelat pH 5 was -16.10kJmol-1 , ΔSa was -50.10 Jmol-1K -1 which indicated an increase in order due to adsorption and ΔGa was negative only from 298K to 323K. Results of adsorption on Protobind 1000 were pretty much the inverse over the same range of temperature, proving the great affinity of cellulases for lignin. Over 298K to 333K, desorption from Avicel resulted in a ΔHdincrease from 17.50 to 26.20 kJmol-1 , and a ΔSdincrease from 46.89 to 75.65Jmol-1K -1when pH increased from 6 to 9indicating an enthalpy-driven, nonspontaneous desorption. For Protobind, the positive ΔHd (9.65 to 6.90 kJmol-1 ) with small positive ΔSd (21.70 to 9.03 Jmol-1K -1 ) indicated that disorder was less than that of Avicel. For both the substrates ΔGd decreased with rise in temperature in given temperature range. The minimum ΔGdof Avicel than that of Protobind proved that it was more difficult to desorb cellulases from Protobind.For bioethanol producing industries, using lignocellulosic material (e.g., wheat straw) where cellulose is embedded in lignin, removal of lignin is recommend along with adsorption/hydrolysis to be conducted at 323 K and desorption from used material at 333 K and pH 9.
Authors and Affiliations
Khurram Shahzad Baig
Keywords
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