使用可重复使用的氧化吸附剂从酸性水中去除(V) 离子
Peirou Li1, Laura Newsome1, Arthur Graf2
1Camborne School of Mines and Environment and Sustainability Institute, University of Exeter, TR10 9FE, UK.
Journal of hazardous materials
|February 28, 2025
概括
氧化 (MnOx) 有效地从酸性水中去除 (V) 离子. 这种可重复使用的吸附剂具有强烈的吸附性,特别是在低pH值下,为水处理提供了可持续的解决方案.
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:
- (V) 离子对酸性水的污染对环境构成风险.
- 有效和可持续的去除方法对于水处理至关重要.
研究的目的:
- 研究不同类型的氧化 (MnOx) 的吸附能力,以从酸性水中去除.
- 了解MnOx的吸附机制和可重复使用性,用于修复.
主要方法:
- 使用自然存在的 (NatMnO),商业来源的 (ComMnO) 和合成的 (SynMnO) 氧化物进行了批量吸附实验.
- 在不同的pH值,吸附剂剂量,离子强度和接触时间下研究了吸附.
- 使用异热和动力模型分析了吸附平衡和动力数据,并通过再生周期测试了MnOx可重复使用性.
主要成果:
- 氧化显示出显著的吸附,其性能按照以下顺序进行:NatMnO > SynMnO > ComMnO.
- 在酸性pH (pH3.0) 时观察到最大的吸附能力,在NatMnO.中达到54.0 mg/g.
- 吸附遵循弗洛伊德利希等温模型和两个恒定速率运动模型,表明多层吸附和联合物理/化学吸附. 去除在低pH下最有效,这是由于MnOx的负泽塔潜力.
- 再生MnOx保留或提高了其吸附能力,证实了其可重复使用性.
结论:
- 氧化是有效的,可重复使用的吸附剂,可以从酸性水中去除离子.
- 这项研究增强了对吸附到MnOx.的机制的理解.
- 这些发现支持开发可持续技术,用于处理被污染的酸性废水.
相关概念视频
Radical Oxidation of Allylic and Benzylic Alcohols
1.9K
Activated manganese(IV) oxide can selectively oxidize allylic and benzylic alcohols via a radical intermediate mechanism. Primary allylic alcohols are oxidized to aldehydes, while secondary allylic alcohols yield ketones. The redox reaction of potassium permanganate with an Mn(II) salt such as manganese sulfate (under either alkaline or acidic conditions), followed by thorough drying, yields the oxidizing agent: activated MnO2. While MnO2 is insoluble in the solvents used for the reaction, the...
1.9K
Redox Titration: Other Oxidizing and Reducing Agents
221
Besides iodine, other oxidizing or reducing agents can serve as titrants in redox titrations. Common oxidizing titrants include KMnO4, cerium(IV), and K2Cr2O7. The choice of oxidizing titrants depends on factors like stability, cost, analyte strength, and reaction rate between the analyte and titrant. KMnO4 is a strong oxidizing titrant that reduces from Mn(VII) to Mn(II) in a highly acidic solution, simultaneously oxidizing the analyte to a higher oxidation state. In this case, KMnO4 acts as a...
221
Extraction: Advanced Methods
398
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...
398
Voltammetry: Stripping Methods
160
Anodic Stripping Voltammetry (ASV), Cathodic Stripping Voltammetry (CSV), and Adsorptive Stripping Voltammetry (AdSV) are electrochemical techniques used to determine trace amounts of analytes in solution. These methods involve applying a potential to an electrode and measuring the resulting current.
Anodic Stripping Voltammetry (ASV)
ASV is used to determine metals and metalloids at trace levels. It involves two steps: deposition and stripping. First, a negative potential is applied to the...
Anodic Stripping Voltammetry (ASV)
ASV is used to determine metals and metalloids at trace levels. It involves two steps: deposition and stripping. First, a negative potential is applied to the...
160
Precipitation and Co-precipitation
1.6K
Precipitation and coprecipitation methods can be used to separate a mixture of ions in a solution. In qualitative inorganic analysis, ions that form sparingly soluble precipitates with the same reagent are separated based on the differences in solubility products. For example, consider the separation of Cu(II) and Fe(II) ions by precipitation as insoluble sulfides. First, copper(II) sulfide is precipitated by the addition of acidic H2S, where the dissociation of H2S is suppressed. Adding H2S...
1.6K
Ion Exchange
520
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...
520


