通过铁制造的生物炭高效地去除水性酸盐:性能和机制
Jingzi Beiyuan1, Xinyi Wu2, Bo Ruan3
1School of Environmental and Chemical Engineering, Foshan University, Foshan, China; School of Food Science and Technology, Foshan University, Foshan, China.
Chemosphere
|August 30, 2024
概括
铁改性生物炭有效地从废水中去除酸盐. 不同的修改方法产生不同的去除能力和机制,Fe-MnBC表现出卓越的性能和可回收性.
科学领域:
- 环境科学 环境科学
- 材料科学 材料科学 材料科学
- 水处理 处理水的方法
背景情况:
- 肥料造成的酸盐污染需要有效的废水处理解决方案.
- 生物炭 (BC) 显示出对酸盐去除的承诺,铁 (Fe) - (Mn) 氧化物修饰增强了其容量.
- 缺乏对修改方法对BC性能影响的系统检查.
研究的目的:
- 研究和比较两个不同的Fe-Mn修饰生物炭材料的酸盐去除性能和机制.
- 了解不同的Fe和Mn氧化物结构如何影响酸盐吸附.
- 评估修改生物炭的再生能力,以实现可持续的水资源整治.
主要方法:
- 合成两个Fe-Mn修饰的生物炭:Fe/MnBC (Fe3O4和MnO2) 和Fe-MnBC (MnFe2O4) 的合成.
- 使用微观结构和光谱分析进行全面的表征.
- 酸吸附实验,以确定吸附能力和去除机制.
- 在多个循环中进行再生测试.
主要成果:
- 与Fe/MnBC (17.93 mg g-1) 相比,Fe-MnBC显示出明显更高的最大酸盐吸附能力 (135.88 mg g-1).
- 确认了明显的Fe和Mn氧化物,影响了去除效率.
- 酸盐去除机制各不相同:Fe/MnBC的内球复合和沉,Fe-MnBC的静电相互作用和外球复合.
- Fe-MnBC表现出极好的再生能力,在五个周期后保持超过81.34%的去除效率.
结论:
- 修改方法对Fe-Mn生物炭的酸盐去除效率和机制产生了重大影响.
- Fe-MnBC 提供了一个高效和可再生的解决方案,用于从废水中去除酸盐.
- 结果为设计用于水污染物修复的先进生物炭材料提供了洞察力.
相关概念视频
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Compared with pure water, the solubility of an ionic compound is less in aqueous solutions containing a common ion (one also produced by dissolution of the ionic compound). This is an example of a phenomenon known as the common ion effect, which is a consequence of the law of mass action that may be explained using Le Chȃtelier’s principle. Consider the dissolution of silver iodide:
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Metal ions can be separated from one another by complexation with organic ligands–the chelating agent– to form uncharged chelates. Here, the chelating agent must contain hydrophobic groups and behave as a weak acid, losing a proton to bind with the metal. Since most organic ligands used in this process are insoluble or undergo oxidation in the aqueous phase, the chelating agent is initially added to the organic phase and extracted into the aqueous phase. The metal-ligand complex is...
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