柠檬皮渣对亚甲基蓝吸附性能研究

采用柠檬皮渣作为吸附剂对水溶液中亚甲基蓝进行吸附研究,考察了柠檬皮渣用量、溶液pH值、吸附时间、亚甲基蓝浓度、温度对吸附量的影响。结果表明:当柠檬皮渣用量为1 g/L,亚甲基蓝的初始质量浓度为100 mg/L,pH值为7,温度为30℃时,柠檬皮渣对亚甲基蓝吸附效果最好,吸附量为36.2 mg/g,吸附过程符合Langmuir等温吸附模型,吸附动力学遵从准二级动力学方程,热力学参数计算结果表明此吸附过程为自发的放热过程。

Study on adsorption properties of lemon peel for methylene blue

Using lemon peel as the adsorbent to remove methylene blue from aqueous solution, the influences of lemon peel dosage, solution pH value, adsorption time, methylene blue concentration and temperature on adsorption quantity of methylene blue were investigated. The results showed that, when the lemon peel dosage was 1 g/L, the initial mass concentration of methylene blue was 100 mg/L, the pH value was 7, the temperature was 30 ℃, the maximum adsorption quantity of methylene blue could be obtained, which was 36.2 mg/g. The adsorption process followed Langmuir isotherm model, and the adsorption kinetics fitted pseudo-second order kinetics equation. The calculation results of the thermodynamic parameters revealed the adsorption to be an exothermic and spontaneous process.