生物聚合物辅助的酶诱导碳酸盐沉用于固定水溶液和溶液中的Cu离子
Yi-Xin Xie1,2, Wen-Chieh Cheng3,4, Lin Wang1,2
1School of Civil Engineering, Xi'an University of Architecture and Technology, Xi'an, 710055, China.
Environmental science and pollution research international
|November 1, 2023
概括
生物聚合物辅助酶诱导碳酸盐沉 (EICP) 改善了废水和土壤中的铜固定. 加可以保护尿酶并增强铜结合,克服毒性问题.
科学领域:
- 环境科学 环境科学
- 地质化学 地质化学
- 生物技术是生物技术.
背景情况:
- 铜 (Cu) 采矿和炼废水由于高度的Cu2+造成环境风险.
- 酶诱导碳酸盐沉 (EICP) 用于Cu固定,但Cu2+毒性可以使尿酸酶失活.
- 生物聚合物辅助EICP提供了一个潜在的解决方案,以提高Cu固定效率和稳定性.
研究的目的:
- 研究生物聚合物辅助EICP在水溶液和土壤中固定Cu2+的机制.
- 评估酸盐和 (Ca2+) 在增强尿酶保护和Cu固定化中的作用.
- 评估这项技术在防止Cu2+迁移方面的有效性.
主要方法:
- 进行了一系列试管实验和土壤柱测试.
- 使用数值模拟和显微镜分析来识别碳酸盐沉物种.
- 拉曼光谱和X射线衍射 (XRD) 用于材料表征.
主要成果:
- 酸盐度和pH条件显著影响Cu固定效率.
- 通过促进铜矿物质的石包裹,Ca2+保护了尿酶,调节了pH值,并减少了Cu2+迁移.
- UC1和UC2接将可交换的Cu转化为碳酸盐结合的Cu,减少了Cu的毒性作用.
结论:
- 生物聚合物辅助的EICP,特别是Ca2+,通过形成稳定的碳酸盐矿物质,有效地固定Cu2+.
- 优化条件至关重要,因为高度的奇托会导致不良的铜氨复合体形成.
- 这项技术显示出对 Cu 污染水体和地点的修复有希望.
相关概念视频
Precipitation and Co-precipitation
1.8K
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...
1.8K
Extraction: Advanced Methods
456
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...
456
Electrodeposition
641
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...
641
Coagulation
308
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...
308
Colloidal precipitates
594
The high insolubility of some precipitates can result in an unfavorable relative supersaturation. This can lead to colloidal particles with a large surface-to-mass ratio, where adsorption is promoted. For instance, in the precipitation of silver chloride, silver ions are adsorbed on the surface of the colloidal particles, forming a primary layer. This layer attracts ions of opposite charge (such as nitrate ions), forming a diffuse secondary layer of adsorbed ions. This electric double layer...
594
Types of Coprecipitation
636
Coprecipitation is the contamination of a precipitate by otherwise soluble species and occurs via different processes. In colloidal precipitates, coprecipitation occurs via surface adsorption. For instance, barium sulfate has a primary layer of adsorbed barium ions and a secondary layer of nitrate counterions. This results in contamination of the precipitate by barium nitrate.
Sometimes, ions in a crystal lattice can undergo isomorphous replacement by inclusions of similar charge and size. For...
Sometimes, ions in a crystal lattice can undergo isomorphous replacement by inclusions of similar charge and size. For...
636


