| .改性粉煤灰对水体中铁锰的去除效果研究[J].农业环境科学学报,2013,32(3):. |
| 改性粉煤灰对水体中铁锰的去除效果研究 |
| Removal of Fe（Ⅲ） and Mn（Ⅱ） from Aqueous Solutions Using Modified Fly Ash |
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| DOI：10.11654/jaes.2013.03.033 |
| 中文关键词: 粉煤灰 改性 水体 Fe（Ⅲ） Mn（Ⅱ） 去除率 吸附动力学 |
| 英文关键词: fly ash modified aqueous solutions Fe（Ⅲ） Mn（Ⅱ） removal rate adsorption kinetics |
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| 摘要点击次数: 1828 |
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| 中文摘要: |
| 水体中过量的铁锰会使人和动植物中毒。粉煤灰作为热电厂固体废物可通过络合、离子交换及化学键合等机理去除水体中铁锰。在恒温（25±1）℃条件下采用批量吸附实验，设置振荡时间、粉煤灰投入量、初始浓度等参数的变化，研究碱改性粉煤灰对水体中共存Fe（Ⅲ）、Mn（Ⅱ）的去除效果。结果表明，改性粉煤灰在最佳振荡时间8 h时、最佳投入量为10 g·L-1时最大吸附量分别为4.8、0.81 mg·g-1；Fe（Ⅲ）的去除率随初始浓度升高而逐渐升高，Mn（Ⅱ）的去除率在初始浓度小于8 mg·L-1 时保持在80%以上，之后随初始浓度升高而显著的降低；Mn（Ⅱ）的吸附符合准二级吸附动力学方程。 |
| 英文摘要: |
| Excessive iron（Fe） and manganese（Mn） in water can threaten the growth of organisms. As a waste material of thermal power plants, fly ash has a good performance to adsorb Fe and Mn by complexation, ion exchange and bonding from aqueous solutions. Batch adsorption experiments were performed under isothermal conditions（25±1）℃, in order to evaluate the effect of various parameters which include oscillation time, dosage of modified fly ash, initial concentration of Fe and Mn on the efficiency of removal using modified fly ash by alkali. The results showed that the modified fly ash had higher removal capacity than raw fly ash. The highest Fe（Ⅲ） and Mn（Ⅱ） removal occurred at 8h with the optimal dosage of 10 g·L-1, and the maximum adsorption capacity reached at 4.8 and 0.81 mg·g-1, respectively. The removal rate of Fe（Ⅲ） showed increasing trend with increasing initial concentration, then it reached equilibrium. While removal rate of Mn（Ⅱ） remained at high level（>80%） with low initial concentration（<8 mg·L-1） and then decreased sharply with the increase of initial concentration. Kinetic studies indicated that Mn（Ⅱ） in binary-ion system was more in accordance with pseudo second-order kinetic model but Fe（Ⅲ） had no suitable adsorption kinetic pattern to follow. Accordingly, modified fly ash will play a significant role in removal of Fe and Mn from aqueous solution in the future. |
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