Thermodynamics and Dynamics of Dye Absorption by Modified Durian Peel
The durian peel is modified with NaOH as raw material,and its structure is characterized by SEM and FT-IR.The absorption performance of modified durian peel(DRP)for Rhodamine B(RhB)is examined,and dynamics and thermodynamics of the adsorption process is studied.The results show that the maximum absorption capacity of DRP for RhB can reach 99.88 mg·g-1 at a temperature of 318 K and a solution pH of 3.21.The△Gθ at temperatures of 298,308 and 318 K are-2.31,-4.34,and-6.41(kJ·mol-1)respectively,and the △Sθ is 204.98(J·mol-1·K-1)and △Hθ is 58.77(kJ·mol-1).The absorption process can be described by a pseudo-second-order dynamics model,which is consistent with the Langmuir isotherm model.DRP can serve as an absorption material for the treatment of dye wastewater containing Rhodamine B.
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