鸡毛吸附水中机油的动力学和热力学研究

Adsorption kinetics and thermodynamics for removal engine oil from aqueous solution using chichen feathers

利用H2O2预处理的鸡毛作为吸附剂对水中机油污染物进行了吸附动力学和吸附热力学研究。在25~55°C范围内,吸附等温线符合Freundlich模型。动力学研究表明,室温下鸡毛吸附机油速度快,吸附15min就达到吸附平衡。吸附可以用拟二级动力学模型描述。计算了吸附过程的热力学参数,标准吉布斯自由能ΔG0为-24.59^-26.63kJ.mol-1,标准焓变ΔH0为-45.74kJ.mol-1,标准熵变ΔS0为-65.35J.(mol.K)-1。结果表明,吸附是一个可自发的、放热和熵减少的过程。

Adsorption kinetics and thermodynamics for removal engine oil pollutant from aqueous solution was investigatied using chichen feathers treated by hydrogen peroxide as adsorbent. The adsorption data were correlated with Langmuir and Freundich isotherms and fitted well with the former model in the temperature range from 25℃ to 55℃. Kinetics measurement showed that the rate of adsorption was rapid and equlibrium time Was found to be 15min at room temperature. The adsorption followed the pseudo - second - order kinetic model. Thermodynamic parameters, Gibb＇s free energyΔG0 ）, change in enthalpy（ ΔH0 ） and change in entropy （ΔS0） were calculated as -24.59 - -26.63 k.J . mol^-1, -45.74 kJ . mol^-1 and -65.35 J . （ mol.K）^-1, respectively. The negative AGo values, negative AHo value and negativeΔS0 value indicated that the adsorption is a spontaneous and exothemic process with a decrease in entropy.