| ADSORPTION OF 1,2,4-ACID BY WEAKLY BASIC RESIN： ISOTHERMS, THERMODYNAMICS AND KINETICS |
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| 引用本文： | Fu-qiangLiu Jin-longChen ChaoLong Ai-minLi Guan-daoGao Quan-xingZhang. ADSORPTION OF 1,2,4-ACID BY WEAKLY BASIC RESIN： ISOTHERMS, THERMODYNAMICS AND KINETICS[J]. 高分子科学, 2004, 0(3): 219-224 |
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| 作者姓名： | Fu-qiangLiu Jin-longChen ChaoLong Ai-minLi Guan-daoGao Quan-xingZhang |
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| 作者单位： | StateKeyLaboratoryofPollutionControlandResourceReuse,SchooloftheEnvironment,NanjingUniversity,Nanjing210093,China |
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| 摘 要： | The adsorption properties, including the adsorption isotherms, thermodynamics and kinetics, of l-amino-2-naphthol-4-sulfonic acid (1,2,4-acid) onto weakly basic resin ND900 are investigated. Both the Langmuir and Freundlich equations can give a good fit to the adsorption isotherms, which indicates an endothermic and a favorable adsorption in our study range. A high yield in elimination of about 45.21%-97.28% is obtained for the tested adsorption systems. The capacity and affinity of the adsorption increase with temperature, due to the phenomena of “solvent-motivated” effects. The value of ΔH is 51.59 kJ/mol, which indicates a chemical adsorption and then expects the poor desorption property of ND900. The negative value of ΔG indicates the spontaneous nature of the adsorption process, and the positive value of ΔS shows the increased randomness at the solid/solution interface during the adsorption process. The value of the adsorption rate constant lower than 0.013 min^-1 is indicative of a slow adsorption rate. The intra-particle diffusion must be one of the rate limiting steps.
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| 关 键 词： | 1 2 4-酸 弱碱性树脂 吸附等温线 吸附动力学 吸附热力学 粒子扩散 |
| 收稿时间： | 2003-01-09 |
| 修稿时间： | 2003-03-31 |
ADSORPTION OF 1,2,4-ACID BY WEAKLY BASIC RESIN: ISOTHERMS, THERMODYNAMICS AND KINETICS* |
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| Fu-qiang Liu,Jin-long Chen,Chao Long,Ai-min Li,Guan-dao Gao,Quan-xing Zhang. ADSORPTION OF 1,2,4-ACID BY WEAKLY BASIC RESIN: ISOTHERMS, THERMODYNAMICS AND KINETICS*[J]. Chinese Journal of Polymer Science, 2004, 0(3): 219-224 |
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| Authors: | Fu-qiang Liu Jin-long Chen Chao Long Ai-min Li Guan-dao Gao Quan-xing Zhang |
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| Affiliation: | State Key Laboratory of Pollution Control and Resource Reuse, School of the Environment,Nanjing University, Nanjing 210093, China |
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| Abstract: | The adsorption properties, including the adsorption isotherms, thermodynamics and kinetics, of 1-arnino-2-naphthol-4-sulfonic acid (1,2,4-acid) onto weakly basic resin ND900 are investigated. Both the Langmuir and Freundlich equations can give a good fit to the adsorption isotherms, which indicates an endothermic and a favorable adsorption in our study range. A high yield in elimination of about 45.21%-97.28% is obtained for the tested adsorption systems. The capacity and affinity of the adsorption increase with temperature, due to the phenomena of "solvent-motivated" effects. The value of △H is 51.59 kJ/mol, which indicates a chemical adsorption and then expects the poor desorption property of ND900. The negative value of AG indicates the spontaneous nature of the adsorption process, and the positive value of △S shows the increased randomness at the solid/solution interface during the adsorption process. The value of the adsorption rate constant lower than 0.013 min-1 is indicative of a slow adsorption rate. The intra-particle diffusion must be one of the rate limiting steps. |
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| Keywords: | Weakly basic resin,1,2,4-Acid,Isotherms,Thermodynamics,Kinetics,Intra-particle diffusion ADSORPTION WEAKLY BASIC RESIN ISOTHERMS KINETICS diffusion adsorption rate slow rate constant lower solution interface during increased randomness solid positive negative nature of process chemical adsorption |
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