| 摘要: |
| 【目的】研究柚子黄皮纤维素在模拟人体胃环境下对Pb2+的吸附效果，为开发廉价的功能性排铅产品提供理论参考。【方法】以柚子黄皮为原料，提取柚子黄皮纤维素，在模拟人体胃环境下，以Pb2+吸附量和去除率为考察指标，分析人工胃液pH、吸附时间、柚子黄皮纤维素添加量、Pb2+初始质量浓度对Pb2+吸附效果的影响，探索最佳的吸附条件，并研究柚子黄皮纤维素对Pb2+的吸附平衡及吸附动力学特性,通过红外光谱分析柚子黄皮纤维素与Pb2+作用的基团。【结果】柚子黄皮纤维素对Pb2+的最佳吸附条件为：柚子黄皮纤维素添加量1.0 g/L，Pb2+初始质量浓度20 mg/L，胃液pH为5，吸附240 min达到吸附平衡，在此条件下Pb2+的最大吸附量为(0.662±0.013) mg/g，去除率为(94.83±0.705)%；用准二级动力学模型可以较好地拟合柚子黄皮纤维素的吸附过程，表明其对Pb2+的吸附以化学吸附为主。红外光谱分析表明，-OH是影响柚子黄皮纤维素吸附Pb2+的主要基团。【结论】柚子黄皮纤维素对Pb2+具有一定的吸附作用，可用来开发人体排铅产品。 |
| 关键词: 柚子黄皮纤维素 模拟胃环境 Pb2+吸附动力学 红外光谱 人工胃液 |
| DOI： |
| 分类号: |
| 基金项目:福建省自然科学基金高校联合资助面上项目（2017J01642）；福建省教育厅中青年教师教育科研项目（JAT170355）；闽南师范大学杰出青年科研人才项目（MJ1602） |
|
| Adsorption of Pb2+ by yellow pomelo peel cellulose in simulated human stomach environment |
|
ZHUANG Yuanhong,XU Xizeng,FEI Peng,et al
|
| Abstract: |
| 【Objective】The adsorption of Pb2+ on yellow pomelo peel cellulose was studied in simulated human gastric environment to provide reference for developing cheap and functional lead removing products.【Method】Cellulose was extracted from yellow pomelo peel.Using Pb2+ adsorbing capacity and removal rate as indicators,the effects of pH of the gastric environment,adsorption time,adsorbent dosage and initial concentration of Pb2+,on Pb2+ adsorption capacity of yellow pomelo peel cellulose were analyzed in simulated human gastric environment.Adsorption equilibrium and kinetics were also investigated,and the functional groups bonding with Pb2+ on yellow pomelo peel cellulose were characterized using an infrared spectrometer.【Result】The optimal adsorption conditions were adsorbent dosage of yellow pomelo peel cellulose 1.0 g/L,Pb2+ initial concentration 20 mg/L,pH of gastric juice 5 and time to adsorption equilibrium 240 minutes.The maximum adsorption capacity of Pb2+ was (0.662±0.013) mg/g,and the removal rate was (94.83±0.705)% under these conditions.The pseudo-second-order kinetics model fitted well with the adsorption process,suggesting that the main process was chemical adsorption.The infrared spectrum indicated that -OH was the main group of yellow pomelo peel cellulose for adsorbing Pb2+.【Conclusion】Yellow pomelo peel cellulose had certain adsorption effects on Pb2+,and can be used to remove Pb2+ from human body. |
| Key words: yellow pomelo peel cellulose simulated stomach environment lead ions adsorption kinetics infrared spectrum artificial gastric juice |
