改性榴莲壳对染料吸附的热力学与动力学研究

Thermodynamics and Dynamics of Dye Absorption by Modified Durian Peel

以NaOH为原料对榴莲壳进行改性,用SEM及FT-IR表征其结构,考察改性榴莲壳(DRP)对罗丹明B(RhB)的吸附性能,并对吸附过程进行动力学与热力学研究。结果表明:在温度为318 K,溶液pH=3.21时,DRP对RhB的最大吸附容量可达99.88(mg·g-1);298、308和318 K三个温度下的ΔGθ分别为-2.31、-4.34和-6.41(kJ·mol-1),ΔSθ=204.98(J·mol-1·K-1),ΔHθ=58.77(kJ·mol-1);吸附过程可用拟二级动力学模型来描述,符合Langmuir等温线模型;DRP可作为吸附材料用于治理含罗丹明B的染料废水。

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.TheΔGθat temperatures of 298,308 and 318 K are-2.31,-4.34,and-6.41(kJ·mol-1)respectively,and theΔSθis 204.98(J·mol-1·K-1)andΔHθis 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.