Sustained release of persulfate from inert inorganic materials for groundwater remediation

Pham, Peter; Federico-Perez, Roberto A.; Fine, Kevin L.; Matzek, Laura W.; Carter, Kimberly E.; Palomino, Angelica M.; Chen, Xue-Tai

doi:10.1016/j.chemosphere.2020.127508

Cited by 7 publications

(1 citation statement)

References 63 publications

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“…Paraffin wax is non-toxic and easy to mold into different shapes. It was initially employed to formulate matrix fertilizer and is now commonly employed as a matrix to prepare sustained-release materials [23,24]. Christenson et al (2016) developed sustained-release permanganate candles and conducted a five-year field experiment, achieving a reduction of 89% in the TCE concentration [25].…”

Section: Introductionmentioning

confidence: 99%

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

Zhu,

Ji,

Hua

et al. 2023

Toxics

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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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