| 活性炭自环已烷中吸附芳香化合物的热力学研究 |
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| 引用本文： | 赵振国,戴东.活性炭自环已烷中吸附芳香化合物的热力学研究[J].河北大学学报(自然科学版),1986(2). |
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| 作者姓名： | 赵振国 戴东 |
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| 作者单位： | 北京大学化学系
(赵振国)，北京大学化学系(戴东) |
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| 摘 要： | 测定了25℃和40℃时活性自环已烷中吸附苯甲酸、水杨酸、苯酚、萘和α—萘酚的吸附等温线,用Lagmuir吸附参数计算了吸附过程的标准热力学函数△G°、△H°和△S°。结果表明,苯酚、萘和α—萘酚的△G°相近,苯甲酸的△G°比水相酸的大。苯甲酸的△S°为大的正值,水杨酸的△S°为不大的正值,苯酚的△S°近于零;而萘和α—萘酚△S°为大的负值。认为,在溶液吸附中有的体系熵效应则可能是吸附过程的主要推动力。
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Thermodynamic Study of Adsorpton of Aromatic Compounds from Cyc-phexane onto Activel Carbon |
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| Abstract: | The adsorption isoterms of some aromatic compounds (benzoic acid, salicylic acid, phenol, naphthalene and α-naphthol ) from cyclohexane onto activel carbon have been determined at 25℃ and 40℃. The changes of standard free energy (△G°), entalpy (△H°) and entropy ( △S°) in adsorption processes have been calculated from the langmuir parameters. The results indicate that values of △G° of phenol, naphthalene and α-naphthol are similar. The △G° of benzoic acid is less larger than that of saliccylic acid. The △s of benzoic acid is highly positive, and those of salicylic acid arid phenol are less positive and close to zero respectively. The △S° values of naphthalene and a-naphthol are highly negative. It suggests that the entropy effect is the primary driving power of adsorption from some sorts of solutions, but enthalpy effect is from other solutions. |
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