Enhanced electrokinetic remediation of cadmium-contaminated natural clay using organophosphonates in comparison with EDTA

Gu, Yingying; Yeung, Albert T.; Li, Hongjiang

doi:10.1016/j.cjche.2017.10.012

Cited by 37 publications

(6 citation statements)

References 48 publications

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“…Chelants are mainly applied to electrokinetic systems to increase the solubilisation of contaminants [ 65 ]. Chelation involves the use of a chelator or sequestering agent to form a separate bond between a single metal central ion and a multi-dentate/bi-dentate ligand.…”

Section: The Role Of Ph Distribution and Its Effect On Electrokinetic...mentioning

confidence: 99%

“…This leads to formation of chelate complexes due to the coordination of the chelator with the central metal ions at two sites or more [ 66 ]. Carboxylates, polyamines, industrial wastewaters, and organophosphonates, such as ethylenediaminetetraacetic acid (EDTA) and citric acid, have been used extensively in lab-scale studies [ 64 , 65 , 67 ]. Chelators also have the tendency to lower the zeta potential of soil particles, which leads to an increase in the electroosmotic flow rate of the electrokinetic system.…”

Section: The Role Of Ph Distribution and Its Effect On Electrokinetic...mentioning

confidence: 99%

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The Role of pH, Electrodes, Surfactants, and Electrolytes in Electrokinetic Remediation of Contaminated Soil

Gidudu

Chirwa

2022

Molecules

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Electrokinetic remediation has, in recent years, shown great potential in remediating polluted environments. The technology can efficiently remove heavy metals, chlorophenols, polychlorinated biphenyls, phenols, trichloroethane, benzene, toluene, ethylbenzene, and xylene (BTEX) compounds and entire petroleum hydrocarbons. Electrokinetic remediation makes use of electrolysis, electroosmosis, electrophoresis, diffusion, and electromigration as the five fundamental processes in achieving decontamination of polluted environments. These five processes depend on pH swings, voltage, electrodes, and electrolytes used in the electrochemical system. To apply this technology at the field scale, it is necessary to pursue the design of effective processes with low environmental impact to meet global sustainability standards. It is, therefore, imperative to understand the roles of the fundamental processes and their interactions in achieving effective and sustainable electrokinetic remediation in order to identify cleaner alternative solutions. This paper presents an overview of different processes involved in electrokinetic remediation with a focus on the effect of pH, electrodes, surfactants, and electrolytes that are applied in the remediation of contaminated soil and how these can be combined with cleaner technologies or alternative additives to achieve sustainable electrokinetic remediation. The electrokinetic phenomenon is described, followed by an evaluation of the impact of pH, surfactants, voltage, electrodes, and electrolytes in achieving effective and sustainable remediation.

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Section: The Role Of Ph Distribution and Its Effect On Electrokinetic...mentioning

confidence: 99%

Section: The Role Of Ph Distribution and Its Effect On Electrokinetic...mentioning

confidence: 99%

The Role of pH, Electrodes, Surfactants, and Electrolytes in Electrokinetic Remediation of Contaminated Soil

Gidudu

Chirwa

2022

Molecules

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“…In view of the shortcomings of electric repair, further, improve the electric repair technology, future work should focus on: First, in-depth study of the interaction mechanism between heavy metals and soil in the electric repair process. For example, it is currently considered that it is difficult to enrich heavy metals such as cadmium and lead in the soil, but many experiments have shown that cadmium and lead in the soil can be moved and concentrated in local areas [23]. As well as the mechanism when the current flows through the soil, there is no good theoretical explanation for some electrical phenomena observed during the restoration process.…”

Section: Electric Repair Technologymentioning

confidence: 99%

Remediation of Heavy Metals Contaminated Soils: A bibliometric Network Analysis

Guo¹,

Zheng²,

Yang³

et al. 2021

J Soil Water Sci

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With the acceleration of industrialization, heavy metal pollution, as one of the major types of soil pollution, is more and more serious. Therefore, the remediation of heavy metal contaminated soil has become a hotspot. This study explored the global scientific literature on the remediation of heavy metal contaminated soils, and conducted statistical and bibliometric analysis of 5733 documents in the core collection of Web of Science. The topics searched are: "Soil", Heavy metal" and "Remediation". The relationship among keywords, authors, countries, and publications for the remediation of heavy metal contaminated soils were showed in the knowledge map. Furthermore, the research hotspot evolution path of soil heavy metal remediation, the research status and development trend of related remediation technologies were analyzed. These results visualize the research results through bibliometrics, examine the research in this field from the perspective of the knowledge graph, and provide references for future development.

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“…The reaction time was an additional significant factor affecting the Cd extraction efficiencies. This might be attributed to the effectiveness of the metal binding organic ligand (EDTA) in chelating Cd [33] to form soluble [34] and bioavailable complexes [35]. Accordingly, EDTA is an effective means for remediating soils contaminated with Cd [36,37].…”

Section: Extraction Of CD From Artificiallymentioning

confidence: 99%

Soil Washing Technology for Removing Heavy Metals from a Contaminated Soil: A Case Study

Alaboudi¹,

Ahmed²,

Brodie³

2020

Pol. J. Environ. Stud.

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Although EDTA solution is considered an efficient soil washing liquid for extraction of heavy metals from soils, its low biodegradability may alter soil properties and suppress plant growth. Alternatively, chlorides are safer and cheaper washing liquids than EDTA. To investigate the efficiency of chlorides versus EDTA in extracting heavy metals from contaminated soils, soil samples (pH 6.14±0.11) were collected from a local agriculture soil in Australia, artificially contaminated with either Pb, Cd or Cr at three different levels of 200, 400 and 600 mg kg -1 , and then packed in capped plastic flasks. Batch washing techniques were followed with either EDTA or FeCl 3 solutions (prepared at 4 different concentrations of 0.05, 0.1, 0.25 and 0.5 M), and soil suspensions were agitated for different time periods (from 5.0 min. to 60.0 min); afterward, the extraction efficiencies of the investigated metals were considered. The removal efficiency of Pb from the contaminated soil (200 mg Pb kg -1 ) after 5 minutes of EDTA application seemed to be relatively high (≈75%). Afterward this efficiency decreased gradually with time. The efficiencies of the extracted Cd and Cr by soil washing with EDTA increased significantly with increases in the agitating period. Generally, the extraction efficiencies by EDTA decreased noticeably with increasing levels of soil contamination. On the other hand, the efficiencies of Pb, Cd and Cr extractions were high -especially when increasing both the concentrations of applied FeCl 3 solution and the time of agitation. The results also highlighted that soil washing with FeCl 3 seemed to be more favourable over EDTA for rapid extraction of heavy metals from contaminated soils. The efficiencies of extracting heavy metals by soil washing with 0.5M FeCl 3 for only one hour were 93.79±2.35%, 97.4±2.45% and 81.75±7.86% for Pb, Cd and Cr, respectively.

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Enhanced electrokinetic remediation of cadmium-contaminated natural clay using organophosphonates in comparison with EDTA

Cited by 37 publications

References 48 publications

The Role of pH, Electrodes, Surfactants, and Electrolytes in Electrokinetic Remediation of Contaminated Soil

The Role of pH, Electrodes, Surfactants, and Electrolytes in Electrokinetic Remediation of Contaminated Soil

Remediation of Heavy Metals Contaminated Soils: A bibliometric Network Analysis

Soil Washing Technology for Removing Heavy Metals from a Contaminated Soil: A Case Study

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