| 平菇菌糠对废水中铜离子的生物吸附性能 |
| 摘要点击 2870 全文点击 2089 投稿时间：2013-05-28 修订日期：2013-09-28 |
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| 中文关键词 生物吸附 平菇菌糠 Cu2+ 吸附等温模型 吸附机制 |
| 英文关键词 biosoroption spent substrate of pleurotus oyster copper ion adsorption isotherm models adsorption mechanism |
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| 中文摘要 |
| 针对重金属污染和农业固体废弃物资源化问题，利用平菇菌糠作为吸附剂对废水中 Cu2+吸附性能进行研究. 通过单因素实验测定pH、吸附时间、温度、Cu2+初始浓度对吸附效果的影响；利用扫描电镜-能谱、红外光谱和X射线衍射对其吸附机制进行了初步探究. 结果表明，菌糠浓度为 10 g·L-1，pH为 6，吸附时间为 120 min，吸附温度为30℃，铜离子初始浓度为 8 mg·L-1的条件下，吸附率可达到 74.46%，吸附容量为0.7446 mg·g-1. 实验数据较好地吻合 Langmuir吸附等温模型，其相关系数为0.9949，表明吸附过程主要为单层化学吸附. 扫描电镜-能谱、红外光谱和 X射线衍射分析显示，平菇菌糠吸附 Cu2+过程主要为物理吸附和化学吸附，包括静电吸附、络合和配位等反应，其中起主要作用的基团为—OH、—COOH、—NH等. |
| 英文摘要 |
| To solve the problems of heavy metal pollution and agricultural wastes reclamation, spent substrate of pleurotus oyster was used as adsorbents to remove Cu2+ from aqueous solution. The effects of pH value, adsorption time, temperature and initial Cu2+ concentration on the adsorption behavior were determined by single factor experiments. The mechanisms were preliminarily investigated by SEM-EDX, FTIR and XRD analysis. The results of single factor experiments showed that the adsorption rate and capacity reached 74.46% and 0.7446 mg·g-1 respectively at an adsorbent concentration of 10 g·L-1, a pH of 6, an adsorption time of 120 min, an adsorption temperature of 30℃ and an initial Cu2+concentration of 8 mg·L-1. The experimental data fitted well with Langmuir isotherm models and R2 reached 0.9949, indicating the adsorption was a monolayer chemisorption. SEM-EDX, FTIR and XRD analysis indicated that the adsorption process mainly depended on the physical and chemical adsorption onto the substrate surface through electrostatic attraction, complexation and coordination reaction. The —OH, —COOH and —NH were the functioning groups for Cu2+ adsorption. |
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