| 袁花,周鹏,彭志远.水杨酸改性单宁基树脂对咖啡因吸附性能研究[J].井冈山大学自然版,2018,(3):13-18 |
| 水杨酸改性单宁基树脂对咖啡因吸附性能研究 |
| ADSORPTION PERFORMANCE OF TANIN BASED-PHENOL RESIN MODIFIED BY SALICYLIC ACID FOR CAFFEINE |
| 投稿时间：2018-01-06 修订日期：2018-04-06 |
| DOI：10.3969/j.issn.1674-8085.2018.03.004 |
| 中文关键词: 杨梅单宁 吸附 水杨酸 咖啡因 |
| 英文关键词: tannin adsorption salicylic acid caffeine |
| 基金项目:国家自然科学基金项目（31760196） |
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| 摘要点击次数: 1839 |
| 全文下载次数: 2484 |
| 中文摘要: |
| 以杨梅单宁为原料，多聚甲醛为交联剂，水杨酸为改性剂，在酸催化下制备水杨酸改性单宁基酚醛吸附树脂，并考察了其对咖啡因的吸附性能。实验结果表明：水杨酸、多聚甲醛和单宁质量比为5：2：5时，合成的吸附树脂对咖啡因的吸附效果最好；酸性环境有利于树脂对咖啡因的吸附；树脂吸附量随着咖啡因浓度的增大而增大，最大吸附量为253.9 mg/g；吸附动力学数据表明准二级吸附动力学模型能更好的描述其吸附行为；吸附热力学数据表明其吸附过程符合Freudlich等温吸附方程，吸附过程为放热反应，ΔG< 0，反应自发进行。 |
| 英文摘要: |
| Adsorption resin of tannin based-phenol was prepared from bayberry tannin and salicylic acid with paraformaldehyde as crosslinker under the acid catalytic, and its adsorption performance for caffeine was investigated. The experimental results showed that the adsorption resin has the best adsorption effect for caffeine when the mass ratio of salicylic acid, paraformaldehyde and tannin is 5:2:5; the acidic environment is propitious to its adsorption for caffeine; the adsorption capacity for caffeine increased with its increasing concentration with the maximum adsorption capacity of 253.9 mg/g. The adsorption kinetic data showed that the quasi-second-order kinetics model was preferable to characterize the adsorption behavior. The adsorption thermodynamic data shows that the adsorption process accords with the Freudlich isothermal adsorption equation, and is exothermic reaction, ΔG< 0, the reaction proceeds spontaneously. |
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