Evaluation of self-oxidation and selectivity of iron-based reductant in anaerobic pentachlorophenol contaminated soil

Yangmin Ren; Yonghyeon Lee; Mingcan Cui; Yongyue Zhou; Hong Liang; Jeehyeong Khim

doi:10.1016/j.jhazmat.2021.127322

Evaluation of self-oxidation and selectivity of iron-based reductant in anaerobic pentachlorophenol contaminated soil

Yangmin Ren
, Yonghyeon Lee
, Mingcan Cui^*
, Yongyue Zhou
, Hong Liang
, Jeehyeong Khim

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

7 Citations (Scopus)

Abstract

Soil contamination due to chlorinated organics prompts an important environmental problem; however, the iron-based reduction materials and complicated ground environment are the main barriers to implementation and promotion of in situ soil remediation. Therefore, this study aims to evaluate the reductants zero-valent iron (ZVI) and its activated carbon composite (AC-ZVI) in terms of their self-oxidation and selectivity in soil experiments. The results indicated that saturated moisture conditions were beneficial for degradation due to the dispersal of the pollutants from soil particles. Particularly, increasing the water/soil ratio to the over-saturated state would decrease the selectivity of ZVI and AC-ZVI. Meanwhile, increasing the reductant loading decreased the selectivity of ZVI and AC-ZVI, whereas the high initial concentration increased the selectivity of AC-ZVI. In addition, the self-oxidation of ZVI (3.0 ×10⁻³ h⁻¹) is 4.2 times higher than that of AC-ZVI (0.7 ×10⁻³ h⁻¹), and the selectivity of AC-ZVI (48%) is 6.9 times higher than that of ZVI (7%), which confirmed that AC-ZVI is a superior iron-based amendment in saturated moisture conditions. Therefore, this study provides a reliable and feasible evaluation method for in situ remediation process, and deepens the understanding of the effects of moisture contents.

Original language	English
Article number	127322
Journal	Journal of hazardous materials
Volume	424
DOIs	https://doi.org/10.1016/j.jhazmat.2021.127322
Publication status	Published - 2022 Feb 15

Bibliographical note

Funding Information:
Funding: This work was supported by the Korean Ministry of the Environment as a Subsurface Environment Management (SEM) project (No. 2019002480001 ) and Nanjing Science and Technology Program - International Cooperation in Industrial Technology Research and Development (NSTP) project (No. 201911003 ).

Publisher Copyright:
© 2021 Elsevier B.V.

Keywords

Activated carbon zero-valent iron
Selectivity
Self-oxidation
Soil remediation

ASJC Scopus subject areas

Environmental Engineering
Environmental Chemistry
Waste Management and Disposal
Pollution
Health, Toxicology and Mutagenesis

Access to Document

10.1016/j.jhazmat.2021.127322

Cite this

@article{e5e9631c825b41289e217939f3619ad6,

title = "Evaluation of self-oxidation and selectivity of iron-based reductant in anaerobic pentachlorophenol contaminated soil",

abstract = "Soil contamination due to chlorinated organics prompts an important environmental problem; however, the iron-based reduction materials and complicated ground environment are the main barriers to implementation and promotion of in situ soil remediation. Therefore, this study aims to evaluate the reductants zero-valent iron (ZVI) and its activated carbon composite (AC-ZVI) in terms of their self-oxidation and selectivity in soil experiments. The results indicated that saturated moisture conditions were beneficial for degradation due to the dispersal of the pollutants from soil particles. Particularly, increasing the water/soil ratio to the over-saturated state would decrease the selectivity of ZVI and AC-ZVI. Meanwhile, increasing the reductant loading decreased the selectivity of ZVI and AC-ZVI, whereas the high initial concentration increased the selectivity of AC-ZVI. In addition, the self-oxidation of ZVI (3.0 ×10−3 h−1) is 4.2 times higher than that of AC-ZVI (0.7 ×10−3 h−1), and the selectivity of AC-ZVI (48\%) is 6.9 times higher than that of ZVI (7\%), which confirmed that AC-ZVI is a superior iron-based amendment in saturated moisture conditions. Therefore, this study provides a reliable and feasible evaluation method for in situ remediation process, and deepens the understanding of the effects of moisture contents.",

keywords = "Activated carbon zero-valent iron, Selectivity, Self-oxidation, Soil remediation",

author = "Yangmin Ren and Yonghyeon Lee and Mingcan Cui and Yongyue Zhou and Hong Liang and Jeehyeong Khim",

note = "Funding Information: Funding: This work was supported by the Korean Ministry of the Environment as a Subsurface Environment Management (SEM) project (No. 2019002480001 ) and Nanjing Science and Technology Program - International Cooperation in Industrial Technology Research and Development (NSTP) project (No. 201911003 ). Publisher Copyright: {\textcopyright} 2021 Elsevier B.V.",

year = "2022",

month = feb,

day = "15",

doi = "10.1016/j.jhazmat.2021.127322",

language = "English",

volume = "424",

journal = "Journal of hazardous materials",

issn = "0304-3894",

publisher = "Elsevier B.V.",

}

TY - JOUR

T1 - Evaluation of self-oxidation and selectivity of iron-based reductant in anaerobic pentachlorophenol contaminated soil

AU - Ren, Yangmin

AU - Lee, Yonghyeon

AU - Cui, Mingcan

AU - Zhou, Yongyue

AU - Liang, Hong

AU - Khim, Jeehyeong

N1 - Funding Information: Funding: This work was supported by the Korean Ministry of the Environment as a Subsurface Environment Management (SEM) project (No. 2019002480001 ) and Nanjing Science and Technology Program - International Cooperation in Industrial Technology Research and Development (NSTP) project (No. 201911003 ). Publisher Copyright: © 2021 Elsevier B.V.

PY - 2022/2/15

Y1 - 2022/2/15

N2 - Soil contamination due to chlorinated organics prompts an important environmental problem; however, the iron-based reduction materials and complicated ground environment are the main barriers to implementation and promotion of in situ soil remediation. Therefore, this study aims to evaluate the reductants zero-valent iron (ZVI) and its activated carbon composite (AC-ZVI) in terms of their self-oxidation and selectivity in soil experiments. The results indicated that saturated moisture conditions were beneficial for degradation due to the dispersal of the pollutants from soil particles. Particularly, increasing the water/soil ratio to the over-saturated state would decrease the selectivity of ZVI and AC-ZVI. Meanwhile, increasing the reductant loading decreased the selectivity of ZVI and AC-ZVI, whereas the high initial concentration increased the selectivity of AC-ZVI. In addition, the self-oxidation of ZVI (3.0 ×10−3 h−1) is 4.2 times higher than that of AC-ZVI (0.7 ×10−3 h−1), and the selectivity of AC-ZVI (48%) is 6.9 times higher than that of ZVI (7%), which confirmed that AC-ZVI is a superior iron-based amendment in saturated moisture conditions. Therefore, this study provides a reliable and feasible evaluation method for in situ remediation process, and deepens the understanding of the effects of moisture contents.

AB - Soil contamination due to chlorinated organics prompts an important environmental problem; however, the iron-based reduction materials and complicated ground environment are the main barriers to implementation and promotion of in situ soil remediation. Therefore, this study aims to evaluate the reductants zero-valent iron (ZVI) and its activated carbon composite (AC-ZVI) in terms of their self-oxidation and selectivity in soil experiments. The results indicated that saturated moisture conditions were beneficial for degradation due to the dispersal of the pollutants from soil particles. Particularly, increasing the water/soil ratio to the over-saturated state would decrease the selectivity of ZVI and AC-ZVI. Meanwhile, increasing the reductant loading decreased the selectivity of ZVI and AC-ZVI, whereas the high initial concentration increased the selectivity of AC-ZVI. In addition, the self-oxidation of ZVI (3.0 ×10−3 h−1) is 4.2 times higher than that of AC-ZVI (0.7 ×10−3 h−1), and the selectivity of AC-ZVI (48%) is 6.9 times higher than that of ZVI (7%), which confirmed that AC-ZVI is a superior iron-based amendment in saturated moisture conditions. Therefore, this study provides a reliable and feasible evaluation method for in situ remediation process, and deepens the understanding of the effects of moisture contents.

KW - Activated carbon zero-valent iron

KW - Selectivity

KW - Self-oxidation

KW - Soil remediation

UR - https://www.scopus.com/pages/publications/85116028680

U2 - 10.1016/j.jhazmat.2021.127322

DO - 10.1016/j.jhazmat.2021.127322

M3 - Article

C2 - 34601407

AN - SCOPUS:85116028680

SN - 0304-3894

VL - 424

JO - Journal of hazardous materials

JF - Journal of hazardous materials

M1 - 127322

ER -

Evaluation of self-oxidation and selectivity of iron-based reductant in anaerobic pentachlorophenol contaminated soil

Abstract

Bibliographical note

Keywords

ASJC Scopus subject areas

Access to Document

Other files and links

Fingerprint

Cite this