不同的来源通过微生物诱导的碳酸盐沉影响矿化Cr (VI) 的产品和部位
Chunyangzi Jiang1, Liang Hu1, Ni He1
1School of Minerals Processing and Bioengineering, Key Laboratory of Biohydrometallurgy of Ministry of Education, Central South University, Changsha, 410083, China.
Chemosphere
|July 31, 2024
概括
化 (CaCl2) 是利用微生物诱导碳酸盐沉 (MICP) 修复六价 (Cr(VI)) 污染的最有效的来源. 这种方法增强了受污染的土壤中的Cr(VI) 减少和矿化.
科学领域:
- 环境科学 环境科学
- 生物技术是生物技术.
- 地质化学 地质化学
背景情况:
- 微生物诱导碳酸盐沉 (MICP) 是一种越来越多地用于环境修复的生物矿物化技术.
- 六价 (Cr(VI)) 构成严重的重金属污染风险,需要有效的补救策略.
- 来源对于污染物修复中MICP过程的效率至关重要.
研究的目的:
- 通过MICP调查三种不同的来源 (CaCl2,Ca(CH3COO) 2和Ca(C6H11O7) 2) 在Cr(VI) 补救中的有效性.
- 评估这些来源对Cr (VI) 减少,矿化和微生物活性的影响.
- 确定最佳的源,以增强基于MICP的CrVI修复.
主要方法:
- 使用MICP与CaCl2,Ca(CH3COO) 2和Ca(C6H11O7) 2进行Cr6 (VI) 整治的比较分析.
- 在不同的处理下,对Sporosarcina saromensis W5的尿酶活性进行评估.
- 使用先进的分析技术对Cr物种转化和矿物沉的表征.
主要成果:
- 在Cr6矿化过程中,CaCl2的效率最高,而Ca6H11O7的效率较高,Ca2显著促进了Cr6的降解.
- 所有测试的来源都增强了尿酶活性,CaCl2在相当的Ca2+度下表现优越.
- Cr 种主要转化为碳酸盐结合和细胞质/细胞膜状态,并共同沉形成 Ca10Cr6O24 ((CO3) 和各种碳酸多态 (石,水石).
结论:
- 由于其在减少和矿化方面的有效性,CaCl2被确定为最适合优化MICP介导的Cr(VI) 整治的源.
- 该研究为MICP技术在重金属污染土壤修复中的应用提供了宝贵的见解.
- 了解不同源的作用可以导致更有效和更有针对性的生物修复策略.
相关概念视频
Solubility Equilibria
52.4K
Solubility equilibria are established when the dissolution and precipitation of a solute species occur at equal rates. These equilibria underlie many natural and technological processes, ranging from tooth decay to water purification. An understanding of the factors affecting compound solubility is, therefore, essential to the effective management of these processes. This section applies previously introduced equilibrium concepts and tools to systems involving dissolution and precipitation.
The...
The...
52.4K
Gravimetry: Inorganic And Organic Precipitating Agents
1.2K
In gravimetry, the precipitant is chosen carefully to obtain a pure solid that can be easily filtered. Common inorganic precipitants can be used to determine several cations and anions. In some cases, the formation of the same precipitate can be used to determine the cation and the anion. For example, the reaction of barium and chromate ions to give barium chromate is used to determine both barium and chromate. However, precipitates such as hydroxides, oxalates, and metal ammonium phosphates...
1.2K
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
Types of Coprecipitation
585
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...
585
Precipitation of Ions
27.9K
Predicting Precipitation
The equation that describes the equilibrium between solid calcium carbonate and its solvated ions is:
The equation that describes the equilibrium between solid calcium carbonate and its solvated ions is:
27.9K
Precipitation and Co-precipitation
1.7K
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...
1.7K


