农业系统中阴离子金属体和阴离子金属的同时固定化策略:一篇综述
Khadeza Yasmin1, Md Shahadat Hossain2, Wai Chin Li3
1Department of Science and Environmental Studies, The Education University of Hong Kong, Tai Po, Hong Kong Special Administrative Region, 999077, China; Department of Soil Science, Sylhet Agricultural University, Sylhet, 3100, Bangladesh.
Chemosphere
|August 17, 2024
概括
在土壤中同时进行重金属整治具有挑战性. 本次审查强调了诸如生物炭和水资源管理等策略,以固定阴离子和阴离子金属,改善土壤和作物质量,同时减少污染.
科学领域:
- 环境科学 环境科学
- 土壤科学 土壤科学
- 整治技术 整治技术
背景情况:
- 在自然环境中同时进行重金属修复是复杂的,因为金属物种化和土壤水分相互作用.
- 在土壤作物系统中,对阳离子和阴离子金属的同时固定存在重大挑战.
研究的目的:
- 审查和合成在土壤作物系统中同时固定阴离子和阴离子重金属的策略.
- 探索各种修订和方法的机制和有效性,用于并发的金属修复.
主要方法:
- 关于水资源管理,生物炭,稳定剂,纳米技术,施肥和生物修复的文献综述.
- 固定化机制的分析,包括吸附-脱附,氧化-减氧,沉,联体交换和离子交换.
- 检查修改对土壤特性和作物发展的影响.
主要成果:
- 喷雾器/间歇灌用土壤修改/生物炭有效地通过由土壤特性影响的各种机制同时固定As/Cd/Pb.
- 来自不同来源的生物炭,特别是当它与纳米粒子 (例如Fe-纳米粒子) 改性或结合时,通过沉将多种金属 (As/Cd/Pb/Cr/Co/Cu/Zn) 固定.
- 组合修正 (含Fe的生物炭,酸,微生物等) ),肥和具有特定特性的纳米生物炭显示出对同时固定化的承诺.
- 修改通过增强生长代谢物和形成保护性根壁垒 (Fe-plaque) 来改善土壤的物理化学特性和作物发育.
结论:
- 结合水资源管理,生物炭和其他修正案的整体方法对于有效的同时重金属固定至关重要.
- 机制涉及沉,吸附和氧化还原反应,受土壤pH和Fe-氧化物的影响,生物炭起着关键作用.
- 这些策略减少了植物的氧化损害,改善了土壤和作物质量,并减轻了食品污染,为重金属污染提供了可持续的解决方案.
更多相关视频
11:04Ion Mobility-Mass Spectrometry Techniques for Determining the Structure and Mechanisms of Metal Ion Recognition and Redox Activity of Metal Binding Oligopeptides
Published on: September 7, 2019
9.1K
05:35Quantification of Metal Leaching in Immobilized Metal Affinity Chromatography
Published on: January 17, 2020
7.3K
相关概念视频
03:46Qualitative Analysis
For solutions containing mixtures of different cations, the identity of each cation can be determined by qualitative analysis. This technique involves a series of selective precipitations with different chemical reagents, each reaction producing a characteristic precipitate for a specific group of cations. Metal ions within a group are further separated by varying the pH, heating the mixture to redissolve a precipitate, or adding other reagents to form complex ions.
For instance, group IV...
For instance, group IV...
02:51Metal-Ligand Bonds
The hemoglobin in the blood, the chlorophyll in green plants, vitamin B-12, and the catalyst used in the manufacture of polyethylene all contain coordination compounds. Ions of the metals, especially the transition metals, are likely to form complexes.
In these complexes, transition metals form coordinate covalent bonds, a kind of Lewis acid-base interaction in which both of the electrons in the bond are contributed by a donor (Lewis base) to an electron acceptor (Lewis acid). The Lewis acid in...
In these complexes, transition metals form coordinate covalent bonds, a kind of Lewis acid-base interaction in which both of the electrons in the bond are contributed by a donor (Lewis base) to an electron acceptor (Lewis acid). The Lewis acid in...
01:19Complexation Equilibria: The Chelate Effect
In complexation reactions, metal atoms or cations interact with ligands to form donor-acceptor adducts called metal complexes. Ligands that bind through one donor site are monodentate, ligands with two donor sites are bidentate, and those with more than two donor sites are polydentate ligands. For example, ethylene diamine is a bidentate ligand that binds through two nitrogen donor atoms, forming a five-membered ring. EDTA is a polydentate ligand that binds through four oxygen and two nitrogen...
01:19Masking and Demasking Agents
EDTA titrations may necessitate masking and demasking agents to temporarily protect a particular metal ion in a mixture from the EDTA reaction. These agents facilitate the sequential analysis of the metal ions by forming stable complexes with some—but not all—metal ions during certain steps.
There are many masking agents, such as cyanide, fluoride, triethanolamine, thiourea, and 2,3-bis(sulfanyl)propan-1-ol (formerly 2,3-dimercapto-1-propanol), with the masking agent chosen based on the metal...
There are many masking agents, such as cyanide, fluoride, triethanolamine, thiourea, and 2,3-bis(sulfanyl)propan-1-ol (formerly 2,3-dimercapto-1-propanol), with the masking agent chosen based on the metal...
00:56Extraction: Advanced Methods
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 formed in...
01:09Complexation Equilibria: Factors Influencing Stability of Complexes
In complexation reactions, metal cations are the electron pair acceptors, and the ligands are the electron pair donors. The stability of the metal complexes depends primarily on the complexing ability of the central metal ion and the nature of the ligands. Generally, the complexing ability of the metal ion depends on the size and charge of the ion. As the metal ion size increases, the stability of the metal complexes decreases, provided that the valency of the metal ion and the ligands remain...