| .游离和固定化香菇废弃菌柄处理含铅废水的比较研究[J].农业环境科学学报,2013,32(3):. |
| 游离和固定化香菇废弃菌柄处理含铅废水的比较研究 |
| Comparative Study on Treating Wastewater Containing Lead by Free and immobilized Lentinus Edodes Residue |
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| DOI：10.11654/jaes.2013.03.036 |
| 中文关键词: 固定化技术 铅 竞争吸附 吸附机理 |
| 英文关键词: immobilization Pb2+ competitive biosorption biosorption mechnism |
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| 摘要点击次数: 2218 |
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| 中文摘要: |
| 本研究针对水体中常见的铅污染问题，资源化利用香菇废弃菌柄，以聚乙烯醇-海藻酸钠（PVA-SA）为包埋剂制成廉价且易于工业应用的固定化香菇小球，对含Pb2+重金属废水进行净化处理。研究了环境因素包括吸附时间、pH、Pb2+的初始浓度和共存离子对香菇固定化前后Pb2+吸附性能的影响。结果表明，固定后的香菇对Pb2+的平衡吸附时间变长了（7 h>1 h）；最适宜pH值范围不变（5～7）；共存离子Cd2+/Cu2+对固定化香菇Pb2+的吸附抑制作用较小，对游离香菇Pb2+的吸附抑制作用较强。热力学分析表明，Freundlich模型能较好地描述游离和固定化香菇对Pb2+的等温吸附过程，固定化香菇对Pb2+的理论最大吸附量明显高于游离香菇的理论最大吸附量（943 mg·g-1>14.9 mg·g-1）。模拟二级动力学模型能最好地描述游离和固定化香菇对Pb2+的动力学吸附过程。扫描电镜观察显示，Pb2+可以和香菇小球表面相互作用，以Pb2+沉淀的形式被吸附。红外光谱研究发现，在固定化香菇小球吸附Pb2+的过程中香菇细胞壁上的-OH、-CO、-CO-NH及PVA发挥了作用。 |
| 英文摘要: |
| To investigate a cheap and practical absorbing material, Lentinus edodes residue was immobilized by polyvinyl alcohol-Na-alginate（PVA-SA） for Pb2+ removal in wastewater. The biosorption of Pb2+ was examined on the effect of time, initial Pb2+ concentrations, pH values and co-existing ions. The results showed that immobilized L.edodes residue had a longer operation time（7 h） than the free Lentinus Edodes（1 h）. Both Cd2+ and Cu2+ had an adverse effect on the biosorption of Pb2+ on both the free L.edodes and the immobilized L.edodes, while the adverse effect was minor on the immobilized L.edodes and serious on the free L.edodes. The biosorption equilibrium data for both free and immobilized L.edodes fitted the Freundlich model well, the theoretical adsorption capacity of Pb2+ on immobilized L. edoded（943 mg·g-1） was far higher than that on the free L.edodes（14.9 mg·g-1）. Pseudo-second-order model well fitted Pb2+ biosorption kinetics of the immobilizing L. edodes and the free L. edodes. The Scanning Electron Microscope observation demonstrated that Pb2+ can form crystal through interaction with the L.edodes and infrared spectrum analysis revealed that such functional groups as-OH, -CO, -CO-NH on L. edodes and PVA played an important role on Pb2+ biosorption on immobilized L.edodes. |
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