| 金属离子对δ-MnO2 去除对叔辛基酚抑制作用的研究 |
| 摘要点击 1766 全文点击 793 投稿时间：2012-10-28 修订日期：2012-11-19 |
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| 中文关键词 δ-MnO2 对叔辛基酚 抑制作用 金属离子 铅离子 |
| 英文关键词 δ-MnO2 4-tert-octylphenol(4-t-OP) inhibition metal ions Pb2+ |
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| 中文摘要 |
| 研究了pH 4.0的水溶液中各种金属离子对合成的δ-MnO2去除对叔辛基酚(4-t-OP)的影响. 实验表明反应150 min时,δ-MnO2对4-t-OP的去除率达到100%,但当反应体系中含有金属离子时,去除效果受到抑制. 抑制效果随金属离子浓度的增加而增大,并随金属离子的不同表现出较大的差异. 在pH 4.0条件下,Pb2+和Mn2+的抑制效果最强,其次为过渡金属离子,再次是碱土金属离子,而碱金属离子基本上不产生抑制作用. 还比较了δ-MnO2对多种金属离子的吸附能力,其对Pb2+的吸附作用最强,在其余的金属离子中,对过渡金属离子的吸附量稍大于碱土金属离子. 结果表明,金属离子所产生抑制作用的源于其占据了δ-MnO2表面反应位点并与4-t-OP形成竞争,而抑制作用大小的差异主要来源于δ-MnO2与金属离子间吸附作用强弱的差别,MnO2表面结构的变化,以及溶液中自由态金属离子的分布比例及其离子半径的不同. |
| 英文摘要 |
| The effect of metal ions on elimination of 4-t-OP by synthetic δ-MnO2 suspension at pH 4.0 was studied. Experiments indicated that the removal of 4-t-OP by δ-MnO2 achieved 100% at reaction time of 150 min. However, the removal of 4-t-OP by δ-MnO2 was restrained when metal ions were added, and the higher concentration of metal ion was, the stronger the inhibition produced. Additionally, there were apparent differences among the inhibitory effect of the tested metal ions. Firstly, Pb2+ and Mn2+ had the strongest effect at pH 4.0, followed by the transition metal ions, then the alkaline earth ions, while the alkali metal ions had little influence on the removal of 4-t-OP by δ-MnO2. Also comparing the adsorption results of metal ions by δ-MnO2, Pb2+ showed the greatest attraction with δ-MnO2, and among the other metal ions, transition metal ions were adsorbed a little more strongly on δ-MnO2than alkaline earth metal ions. Consequences showed that the inhibitory effects of metal ions were due to their occupying reactive sites on δ-MnO2surface, which competed with 4-t-OP. Moreover, the dissimilar suppressions were contributed by the different adsorption capacities, surface structure change of MnO2 and the difference of free metal ion percentage in solution as well as metal ions radii. |
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