| 水合氧化铝负载的磁性核/壳结构Fe3O4@SiO2纳米颗粒对水中磷的去除及再利用 |
| 摘要点击 4131 全文点击 1815 投稿时间：2015-10-08 修订日期：2015-11-17 |
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| 中文关键词 磁性纳米颗粒 水合氧化铝 核壳结构 磷 去除 回收 |
| 英文关键词 magnetic nano-particle hydrous aluminum hydroxide core-shell structure phosphor removal recycle |
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| 中文摘要 |
| 在磁铁矿纳米颗粒表面包被硅壳后再包被水合氧化铝,制备了具备核壳结构的磁性纳米颗粒除磷吸附剂(磁性氧化铝),通过XRD、TEM、VSM、BET比表面积测定进行了表征. XRD和TEM结果显示了核壳结构的存在,其饱和磁化强度达56.00 emu ·g-1,比表面积达47.27 m2 ·g-1. Langmuir模型计算的磷最大吸附量为12.90mg ·g-1,且在25℃和50℃下均保持稳定,反应快速,40min磷去除率达96%以上. 磁性纳米吸附剂对磷的吸附与pH关系密切,在pH为5~9时磷去除率达90%以上. 采用实际污水实验,最佳投量为1.25 kg ·t-1. 吸附-脱附-再生实验结果表明,磷吸附率随循环次数增加稍有下降,吸附的磷可以通过1 mol ·L-1的NaOH脱附,脱附率为90%左右,且吸附剂可以进行再生,具有反复利用和回收磷资源的潜力. |
| 英文摘要 |
| A novel magnetic core/shell structured nano-particle Fe3O4@SiO2 phosphor-removal absorbent functionalized with hydrous aluminum oxides (Fe3O4@SiO2@Al2O3 ·nH2O) was synthesized. Fe3O4@SiO2@Al2O3 ·nH2O was characterized by XRD, TEM, VSM and BET nitrogen adsorption experiment. The XRD and TEM results demonstrated the presence of the core/shell structure,with saturated magnetization and specific surface area of 56.00 emu ·g-1 and 47.27 m2 ·g-1, respectively. In batch phosphor adsorption experiment, the Langmuir adsorption maximum capacity was 12.90 mg ·g-1 and nearly 96% phosphor could be rapidly removed within a contact time of 40 min. Adsorption of phosphor on Fe3O4@SiO2@Al2O3 ·nH2O was highly dependent on pH condition, and the favored pH range was 5-9 in which the phosphor removal rate was above 90%. In the treatment of sewage water, the recommended dosage was 1.25 kg ·t-1. In 5 cycles of adsorption-regeneration-desorption experiment, over 90% of the adsorbed phosphor could be desorbed with 1 mol ·L-1 NaOH, and Fe3O4@SiO2@Al2O3 ·nH2O could be reused after regeneration by pH adjustment with slightly decreased phosphor removal rate with increasing recycling number, which proved the recyclability of Fe3O4@SiO2@Al2O3 ·nH2O and thereby its potential in recycling of phosphor resources. |
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