通过集成的化和氧化过程,电化学辅助的As(III) 去除的强化
Po-Chang Wu1, Chia-Hung Hou2, Zhen He3
1Graduate Institute of Environmental Engineering, National Taiwan University, Taipei 10617, Taiwan; Department of Energy, Environmental and Chemical Engineering, Washington University in St. Louis, St. Louis, MO 63130, United States.
Journal of hazardous materials
|June 30, 2024
概括
一个电气辅助的自我化和无氧化剂工艺 (ESOP) 细胞有效地去除了90.3%的痕量,将As (III) 减少到5μg L-1.1以下. 这种电化学方法提供了高效的排毒和稳定的废物处理.
科学领域:
- 环境科学 环境科学
- 电化学 电化学 电化学
- 水处理 处理水的方法
背景情况:
- 水中的污染对健康构成重大风险.
- 清除的高效和经济有效的方法至关重要.
- 现有的方法通常涉及氧化剂或复杂的后处理.
研究的目的:
- 开发和研究一种电气辅助的自我化和无氧化剂工艺 (ESOP) 细胞,用于微量去除.
- 用ESOP细胞评估毒解毒和稳定效率.
- 评估开发的电化学过程的能耗和转换效率.
主要方法:
- 使用ESOP电池在电压控制条件下工作 (1.21.5V).
- 研究了由电流驱动的As (III) 和As (V) 的迁移.
- 分析了 alkalization 和过氧化 (H2O2) 在氧化和去除中所起的作用.
- 量化去除,将 (III) 转化为 (V),以及能源成本.
主要成果:
- 实现了90.3%的去除,使 (III) 从150μg L-1降低到<5μg L-1.1.
- 证明了高的As (III) 到As (V) 转换效率为97.0%.
- 观察到80%的As(III) 迁移是由于H2O2氧化和20%的pH化.
- 稳定迁移到阳极电极上,以方便废物处理.
- 在1.2V时报告了0.013kWh m-3的低能源成本.
结论:
- 该ESOP电池提供了一种高效的电化学方法来排毒.
- 该过程有效地去除和稳定,简化了废物管理.
- 这种无氧化剂的方法为水中微量污染提供了有希望的解决方案.
相关概念视频
Electrolysis
26.3K
In a galvanic cell, the electrical work is done by a redox system on its surroundings as electrons produced by the spontaneous redox reactions are transferred through an external circuit. Alternatively, an external circuit does work on a redox system by imposing a voltage sufficient to drive an otherwise nonspontaneous reaction in a process known as electrolysis. For instance, recharging a battery involves the use of an external power source to drive the spontaneous (discharge) cell reaction in...
26.3K
Electrodeposition
625
Electrodeposition is a technique used to separate an analyte from interferents by electrochemical processes. Here, the analyte is a metal ion that can be deposited on an electrode immersed in the sample solution. The electrochemical setup consists of an anode and a cathode. When an electric current is applied to the setup, oxidation occurs at the anode. At the cathode, which consists of a large metal surface, metal ions undergo reduction and deposit onto the surface.
Electrodeposition can...
Electrodeposition can...
625
Coagulation
280
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...
280
Factors Affecting Solubility
33.4K
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:
33.4K
Extraction: Advanced Methods
446
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...
446
Ion Exchange
574
Ion exchange chromatography separates charged molecules from a solution by reversibly exchanging them with mobile, or 'active', ions associated with the oppositely charged stationary phase. This method can be used to separate ions, soften and deionize water, and purify solutions. The polymers comprising the ion-exchange column are high-molecular-weight and chemically stable polymers, crosslinked to be porous and essentially insoluble. They are also functionalized with either acidic or...
574


