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主要研究了环氧氯丙烷改性花生壳对亚甲基蓝的吸附作用。考察了溶液pH值、亚甲基蓝初始质量浓度、吸附时间、温度等因素对改性花生壳吸附亚甲基蓝效果的影响。结果表明,当温度为298 K,亚甲基蓝初始质量浓度为100 mg/L时,在改性花生壳用量为2 g/L,溶液pH值为6.00,吸附时间为60min的条件下,亚甲基蓝吸附量最大,可达49.25 mg/g。在试验条件下,改性花生壳对亚甲基蓝的吸附符合拟二级动力学方程,吸附平衡符合Freundlich等温方程,吸附焓变ΔH>0,反应吉布斯自由能ΔG<0,表明该吸附过程为自发进行的吸热过程。
Mainly studied the epichlorohydrin modified peanut shell adsorption of methylene blue. The effects of pH value, initial concentration of methylene blue, adsorption time and temperature on the adsorption of methylene blue on modified peanut shells were investigated. The results showed that when the temperature was 298 K and the initial concentration of methylene blue was 100 mg / L, the adsorption capacity of methylene blue was the highest with the modified peanut shell dosage 2 g / L, the solution pH value 6.00 and the adsorption time 60 min , Up to 49.25 mg / g. Under the experimental conditions, the adsorption of methylene blue on the modified peanut hull accords with the pseudo second-order kinetic equation. The adsorption equilibrium conforms to the Freundlich isothermal equation, the enthalpy of adsorption ΔH> 0 and Gibbs free energy ΔG <0, indicating that the adsorption process is Spontaneous endothermic process.