兰氧化物在基于La的材料中显示出最佳的应用潜力,因为它在复杂的水环境中具有稳定的酸盐吸附特性
Linjuan Zhu1, Yao Zhang2, Shuo Xu2
1College of Environmental Science and Engineering, Beijing Key Lab for Source Control Technology of Water Pollution, Beijing Forestry University, Beijing 100083, China.
Journal of environmental sciences (China)
|December 1, 2024
概括
兰氧化物 (La(OH) 3) 与兰碳酸盐 (La2(CO3) 3相比,在去除方面表现出优异的循环吸附能力. 拉 (OH) 3显示出更好的再生和水处理的实际应用潜力.
科学领域:
- 材料科学 材料科学 材料科学
- 环境化学环境化学
- 吸附技术是一种吸附技术.
背景情况:
- 酸盐污染是一个重要的环境问题,需要有效的去除方法.
- 基于兰的材料正在探索它们在吸附水溶液中的酸盐方面的潜力.
研究的目的:
- 合成和比较不同兰形态材料的酸盐吸附性能.
- 评估碳酸盐 (La2(CO3) 3) 和氧化 (La(OH) 3) 适用于循环去除的适用性.
主要方法:
- 通过直接沉合成材料 (La2(CO3) 3,LaOH) 3,La2O3) 的方法.
- 吸附实验以确定吸附顺序,动力学以及共存离子和pH的影响.
- 评估吸附-脱附周期,以评估材料的稳定性和再生效率.
主要成果:
- 酸盐的吸附顺序:La2(CO3) 3 > La(OH) 3 > La2O3.
- 在5个吸附-脱附周期中,La(OH) 3表现出优越的稳定性和再生性能,与La2(CO3) 3 (40%) 相比,吸附能力 (2.3%) 的下降明显较低.
- 尽管初始吸附率较高,但循环后La2(CO3) 3的性能降低,而La(OH) 3则需要较小的剂量才能有效地将酸盐去除到目标水平.
结论:
- 氧化 (La(OH) 是比碳酸 (La2(CO3) 更适合用于去除中的循环吸附的基质.
- 拉 (OH) 3表现出对共存离子的增强抵抗力和更好的再生能力,这表明实际水处理应用的巨大潜力.
相关概念视频
Factors Affecting Solubility
33.1K
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:
33.1K
Complexometric Titration: Ligands
907
Different monodentate and polydentate ligands are used as complexing agents in complexometric titration reactions. The formation of complexes by mono- and bidentate ligands involves two or more intermediate steps, limiting their use as complexing agents. In comparison, polydentate ligands can form complexes with metal ions in a single-step process, facilitating sharper end points. This means polydentate ligands, such as amino carboxylic acid derivatives, are most commonly employed in...
907
Extraction: Advanced Methods
415
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...
415
Phosphate Buffer
935
The phosphate buffer system is a critical biological mechanism for maintaining pH stability in the body. This system operates primarily through two components: sodium dihydrogen phosphate (NaH2PO4), which acts as a weak acid, and sodium hydrogen phosphate (Na2HPO4), which serves as a weak base.
Sodium dihydrogen phosphate does not fully dissociate in neutral or acidic solutions. When a strong base, such as sodium hydroxide (NaOH), is introduced into the solution, sodium dihydrogen phosphate...
Sodium dihydrogen phosphate does not fully dissociate in neutral or acidic solutions. When a strong base, such as sodium hydroxide (NaOH), is introduced into the solution, sodium dihydrogen phosphate...
935
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
Photoluminescence: Applications
374
Photoluminescence offers a wide range of applications due to its inherent sensitivity and selectivity. This technique allows for both direct and indirect analyses of the analyte. Direct quantitative analysis is possible when the analyte exhibits a favorable quantum yield for fluorescence or phosphorescence. However, an indirect analysis may be feasible if the analyte is not fluorescent or phosphorescent, or if the quantum yield is unfavorable. Indirect methods include reacting the analyte with...
374


