Dynamic Release Characteristics and Kinetics of a Persulfate Sustained-Release Material

Dynamic Release Characteristics and Kinetics of a Persulfate Sustained-Release Material

Sustained-release materials are increasingly being used in the delivery of oxidants for in situ chemical oxidation (ISCO) for groundwater remediation. Successful implementation of sustained-release materials depends on a clear understanding of the mechanism and kinetics of sustained release. In this...

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Bibliographic Details
Published in:Toxics (Basel) Vol. 11; no. 10; p. 829
Main Authors: Zhu, Xueqiang, Ji, Hanghang, Hua, Gang, Zhou, Lai
Format: Journal Article
Language:English
Published: Basel MDPI AG 30-09-2023
MDPI
Subjects:
Analysis
Aquifers
Candles
Contamination
Controlled release
Diffusion coefficient
Environmental remediation
Groundwater
Groundwater treatment
in situ chemical oxidation
Injection molding
Kinetics
Life span
Methods
model fitting
Oxidants
Oxidation
Oxidation-reduction reaction
Oxidizing agents
Paraffin wax
persulfate
Persulfates
Pollutants
Potassium
Sodium persulfate
soil and groundwater remediation
Sustained release
China
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Summary:Sustained-release materials are increasingly being used in the delivery of oxidants for in situ chemical oxidation (ISCO) for groundwater remediation. Successful implementation of sustained-release materials depends on a clear understanding of the mechanism and kinetics of sustained release. In this research, a columnar sustained-release material (PS@PW) was prepared with paraffin wax and sodium persulfate (PS), and column experiments were performed to investigate the impacts of the PS@PW diameter and PS/PW mass ratio on PS release. The results demonstrated that a reduction in diameter led to an increase in both the rate and proportion of PS release, as well as a diminished lifespan of release. The release process followed the second-order kinetics, and the release rate constant was positively correlated with the PS@PW diameter. A matrix boundary diffusion model was utilized to determine the PS@PW diffusion coefficient of the PS release process, and the release lifespan of a material with a length of 500 mm and a diameter of 80 mm was predicted to be more than 280 days. In general, this research provided a better understanding of the release characteristics and kinetics of persulfate from a sustained-release system and could lead to the development of columnar PS@PW as a practical oxidant for in situ chemical oxidation of contaminated aquifers.
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ISSN:2305-6304
2305-6304
DOI:10.3390/toxics11100829