Key Laboratory of Automobile Materials, Ministry of Education and School of Materials Science and Engineering, Jilin University, Changchun 130022, China.
Dalton Trans. 2012 Apr 21;41(15):4544-51. doi: 10.1039/c2dt11827k. Epub 2012 Feb 22.
In this contribution, we synthesized water-soluble Fe(3)O(4) nanoparticles (NPs) with sufficiently high solubility (28 mg mL(-1)) and stability (at least one month) through a hydrothermal approach, and found that they exhibited excellent removal ability for heavy-metal ions from waste water. For the first time, the water-soluble Fe(3)O(4) NPs were used as adsorbents for heavy-metals removal from wastewater. It is noteworthy that the adsorption ability of the water-soluble Fe(3)O(4) NPs for Pb(2+) and Cr(6+) is stronger than water-insoluble Fe(3)O(4) NPs. Furthermore, the water-soluble Fe(3)O(4) NPs exhibited relatively high saturation magnetization (83.4 emu g(-1)), which allowed their highly-efficient magnetic separation from wastewater. The most important thing is that the water-soluble magnetite as an adsorbent can directly dissolve in water without the help of mechanical stirring or any extraneous forces, which may solve a key problem for the practical application of magnetic powders in the field of sewage purification. Moreover, the water-soluble Fe(3)O(4) NPs show a highly-efficient adsorption capacity for 10 ppm of Pb(2+) ions solution which can reach 90% within 2 minutes.
在本研究中，我们通过水热法合成了水溶性良好（28mg/mL）、稳定性较强（至少一个月）的 Fe(3)O(4) 纳米粒子（NPs），并发现其对废水中重金属离子具有优异的去除能力。首次将水溶性 Fe(3)O(4) NPs 用作废水处理中重金属离子的吸附剂。值得注意的是，水溶性 Fe(3)O(4) NPs 对 Pb(2+)和 Cr(6+)的吸附能力强于不溶性 Fe(3)O(4) NPs。此外，水溶性 Fe(3)O(4) NPs 具有较高的饱和磁化强度（83.4 emu/g），可通过磁场实现高效分离。最重要的是，作为吸附剂的水溶性磁铁矿可直接溶解于水中，无需机械搅拌或任何外部力的帮助，这可能解决了磁性粉末在污水净化领域实际应用的一个关键问题。此外，水溶性 Fe(3)O(4) NPs 对 10ppm 的 Pb(2+)离子溶液具有高效的吸附能力，可在 2 分钟内达到 90%的去除率。
