铁转化对来自焦化污泥的碳水化合物的吸附性能的影响机制
The Science of the total environment
|July 14, 2023
概括
焦化污泥的热水碳化 (HTC) 稳定铁,产生磁性 (CHC),有效地从废水中去除刚果红色,四环素和Cr (VI).
科学领域:
- 环境科学 环境科学
- 材料科学 材料科学 材料科学
- 化学工程是化学工程的重要组成部分.
背景情况:
- 焦化污泥对处置来说是一个很大的挑战.
- 污泥中的铁成分可以影响衍生碳化合物的特性.
- 为废水处理开发有效的吸附剂至关重要.
研究的目的:
- 为了研究焦化污泥在水热碳化 (HTC) 过程中铁的转化.
- 探索铁对焦化污泥水炭 (CHC) 吸附性能的影响.
- 评估富含铁的CHC在废水处理中的潜力.
主要方法:
- 在270°C的焦化污泥中进行水热碳化 (HTC).
- 使用X射线衍射 (XRD) 和振动样本磁力测量 (VSM) 描述.
- 使用刚果红 (CR),四环素 (TC) 和Cr (VI) 的吸附实验.
- 在吸附前后进行X射线光电谱 (XPS) 分析.
主要成果:
- 在HTC处理后,超过95%的铁仍然存在于CHC中.
- 铁 (Fe3+) 在HTC过程中被有机化合物降解为Fe2+ .
- 准备好的CHC显示出高吸附能力:CR为140.85 mg/g,TC为147.06 mg/g,Cr (VI) 为19.92 mg/g.
- 氧化铁 (Fe3O4) 通过减少和复杂化显著增强吸附,并赋予磁性,使其易于分离.
结论:
- 在焦化污泥中,HTC有效地稳定铁.
- 富含铁的CHC对有机污染物和重金属具有很好的吸附能力.
- 电加的磁性特性有助于其回收和重复使用.
- 准备好的CHC显示了处理含有CR和TC的工业废水的巨大潜力.
相关概念视频
01:06Coagulation
332
Colloidal solids are solid particles suspended in solution. They are usually negatively charged, attracting a compact primary layer of positively charged ions, which attract more counterions to form an electrical double layer. Electrostatic repulsion between the charged double layers prevents the particles from colliding, stabilizing the colloids. These solids are often undesirable because they can contain toxins that are difficult to remove. Coagulation is a technique that helps aggregate and...
332
00:56Extraction: Advanced Methods
493
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...
493
02:49Corrosion
25.2K
The degradation of metals due to natural electrochemical processes is known as corrosion. Rust formation on iron, tarnishing of silver, and the blue-green patina that develops on copper are examples of corrosion. Corrosion involves the oxidation of metals. Sometimes it is protective, such as the oxidation of copper or aluminum, wherein a protective layer of metal oxide or its derivatives forms on the surface, protecting the underlying metal from further oxidation. In other cases, corrosion is...
25.2K