在 (II) 和 (III) 污染土壤的固化/稳定过程中,芬顿试剂和固体废物固化剂之间的协同作用
Tao Chen1, Bin He1, Dongxin Chu1
1College of Civil Engineering, Taiyuan University of Technology, Taiyuan, 030024, PR China.
Journal of environmental management
|September 21, 2024
概括
一种与芬顿试剂结合的新型BER剂有效地固定污染土壤中的和. 这种协同方法显著提高了的稳定性,达到98%的固定效率,并提高了土壤强度,以便安全重复使用.
科学领域:
- 环境科学 环境科学
- 地质化学 地质化学
- 材料科学 材料科学 材料科学
背景情况:
- 由于其不同的物理化学性质,与 (Pb) 和 (As) 共同污染的土壤的修复具有挑战性.
- 现有的方法难以有效地同时稳定两种重金属.
- 需要新的固化剂来有效地修复土壤.
研究的目的:
- 开发和评估一种由工业废物 (BOFS,EMR,RM) 合成的新型固化剂 (BER).
- 为了研究BER剂和芬顿试剂对Pb和As污染土壤的固化/稳定作用的协同作用.
- 评估固定效率,土壤强度和微观结构变化.
主要方法:
- 使用氧炉渣 (BOFS),改性电解残留物 (EMR) 和红泥 (RM) 合成一种新型固化剂 (BER).
- 用BER剂与芬顿试剂协同应用,用于土壤固化/稳定.
- 对Pb和As的液度分析.
- 测量固化的土壤强度.
- 微观分析 (例如,SEM,XRD) 检查微观结构变化和矿物阶段.
主要成果:
- 单独BER显示出由于不稳定的Ca-As(III) 复合物而导致稳定不充分.
- 通过BER-Fenton处理实现了高的固定效率:Pb为99%,As为98%
- 在BER-Fenton方法中,固化的土壤强度与基于水泥的稳定性相当.
- 显微镜分析显示,石和石含量增加,增强了Pb和As吸附.
- 贝尔-芬顿治疗增加了As{V}到88%,促进了Fe{III}/Mn{IV}的复杂化.
结论:
- 贝尔和芬顿试剂的协同应用为稳定受Pb和As污染的土壤提供了一种有效的方法.
- 这种方法克服了单独的BER的局限性,特别是在稳定中.
- 该方法为重金属污染现场的整治和危险废物再利用提供了可行的解决方案.
相关概念视频
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
Extraction: Advanced Methods
432
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...
432
Factors Affecting Solubility
33.3K
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:
33.3K
Coagulation
278
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...
278
Colloidal precipitates
524
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...
524
Sample Preparation for Analysis: Advanced Techniques
304
Accurate analysis of complex samples often requires advanced preparation techniques to achieve reliable and reproducible results. Samples containing inorganic or organic materials can be challenging to dissolve or decompose effectively. Standard sample preparation methods include acid digestion, fusion, dry ashing, and wet digestion.
Acid digestion with strong acids is commonly used to dissolve inorganic materials that are insoluble (do not dissolve) in water. This method can be useful for...
Acid digestion with strong acids is commonly used to dissolve inorganic materials that are insoluble (do not dissolve) in water. This method can be useful for...
304


