Development of KMnO4-releasing composites for in situ chemical oxidation of TCE-contaminated groundwater

Liang, S.H.; Chen, Ku‐Fan; Wu, Chin-San; Lin, Yao; Kao, Chih‐Ming

doi:10.1016/j.watres.2014.01.068

Cited by 57 publications

(21 citation statements)

References 45 publications

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“…While potassium permanganate (KMnO 4 ) has demonstrated effective oxidation of recalcitrant organic contaminants, paraffin wax possessing the attributes of being unreactive and morphologically sturdy has been an increasingly popular choice of material to contain reactive reagents in the forms of candle 54 , pellet 55 , and microcapsule 56 . Other types of chemically resistant polymers such as polycaprolactone 57 and polyurethane 58 , have also been applied as the primary binding material for similar reasons. These encapsulated particles or pellets gradually dissolved in solutions of designation and are invariably effective for single uses.…”

Section: Resultsmentioning

confidence: 99%

Chitosan Encapsulation of FerrateVI for Controlled Release to Water:Mechanistic Insights and Degradation of Organic Contaminant

Chen

Kuo

Sharma

et al. 2019

Sci Rep

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Tetraoxy-anion of iron in +6 oxidation state (FeVIO42−, FeVI), commonly called ferrate, has shown tremendous potential as a green oxidative agent for decontaminating water and air. Encapsulation of solid potassium salt of ferrate (K2FeO4) circumvents the inherent drawbacks of the instability of ferrate under humid conditions. In the encapsulated strategy, controlled release without exposing the solid ferrate to the humid environment avoids self-decomposition of the oxidant by water in the air, and the ferrate is mostly used to decontaminate water efficiently. This study demonstrated the formulation of oxidative microcapsules with natural materials present in chitosan, whose release rate of the core material can be controlled by the type of intermediate hydrocarbon layer and the pH-dependent swelling of chitosan shell. The pH played a pivotal role in swelling chitosan shell and releasing the core oxidant. In a strong acidic solution, chitosan tended to swell quickly and release FeVI at a faster rate than under neutral conditions. Additionally, among the several long-chain hydrocarbon compounds, oleic acid exhibited the strongest “locking” effect when applied as the intermediate layer, giving rise to the slow release of FeVI. Coconut oil and mineral oil, in comparison, allowed FeVI to penetrate the layer within shorter lengths of time and showed comparable degrees of degradation of target contaminant, methylene orange, under ambient temperature and near-neutral conditions. These findings have practical ramifications for remediating environmental and industrial processes.

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Section: Resultsmentioning

confidence: 99%

Chitosan Encapsulation of FerrateVI for Controlled Release to Water:Mechanistic Insights and Degradation of Organic Contaminant

Chen

Kuo

Sharma

et al. 2019

Sci Rep

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“…Recent efforts to address this ISCO challenge have focused on developing slow-release oxidants that can supply a continuous input of oxidant to a contaminated aquifer for months to years (Lee and Schwartz, 2007a;Ross et al, 2005;Swearingen and Swearingen, 2008). The idea of encapsulating oxidants as a slow-release treatment for contaminated aquifers was first proposed more than a decade ago (Kang et al, 2004;Ross et al, 2005;Schwartz, 2005) and since then, increased interest has appeared in a number of publications that have documented the effectiveness of slow-release oxidants to remove groundwater contaminants at the bench-scale and in larger flow-tank systems (Kambhu et al, 2017(Kambhu et al, , 2012Lee et al, 2009Lee et al, , 2008bLee et al, , 2008aSchwartz, 2007b, 2007a;Liang et al, 2014;Ma et al, 2020;Rauscher et al, 2012;Swearingen and Swearingen, 2008;Yang et al, 2016;Yuan et al, 2013). In their analysis of peer-reviewed research involving controlled-release materials for groundwater remediation, O'Connor et al indicated that of the 30 publications identified, most have been published in the last five years (O'Connor et al, 2018).…”

Section: Introductionmentioning

confidence: 99%

Modeling the release and spreading of permanganate from aerated slow-release oxidants in a laboratory flow tank

Kambhu

Gilmore

et al. 2021

Journal of Hazardous Materials

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Aerated, slow-release oxidants are a relatively new technology for treating contaminated aquifers. A critical need for advancing this technology is developing a reliable method for predicting the radius of influence (ROI) around each drive point. In this work, we report a series of laboratory flow tank experiments and numerical modeling efforts designed to predict the release and spreading of permanganate from aerated oxidant candles (oxidant-wax composites). To mimic the design of the oxidant delivery system used in the field, a double screen was used in a series of flow tank experiments where the oxidant was placed inside the inner screen and air was bubbled upward in the gap between the screens. This airflow pattern creates an airlift pump that causes water and oxidant to be dispersed from the top of the outer screen and drawn in at the bottom. Using this design, we observed that permanganate spreading and ROI increased with aeration and decreased with advection. A coupled bubble flow and transport model was able to successfully reproduce observed results by mimicking the upward shape and spreading of permanganate under various aeration and advection rates.

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“…In situ chemical oxidation (ISCO) using strong oxidants has drawn much attention for being one promising remedial alternative [5-9]. Several strong oxidants, such as ozone [10], Fenton’s reagent [11], permanganate [12], calcium peroxide [13] as well as persulfate [14,15], have been used for ISCO applications.…”

Section: Introductionmentioning

confidence: 99%

Enhanced effect of HAH on citric acid-chelated Fe(II)-catalyzed percarbonate for trichloroethene degradation

Brusseau

Zang

et al. 2017

Environ Sci Pollut Res

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This work demonstrates the impact of hydroxylamine hydrochloride (HAH) addition on enhancing the degradation of trichoroethene (TCE) by the citric acid (CA)-chelated Fe(II)-catalyzed percarbonate (SPC) system. The results of a series of batch-reactor experiments show that TCE removal with HAH addition was increased from approximately 57% to 79% for a CA concentration of 0.1 mM and from 89 to 99.6% for a 0.5 mM concentration. Free-radical probe tests elucidated the existence of hydroxyl radical (HO•) and superoxide anion radical (O2•-) in both CA/Fe(II)/SPC and HAH/CA/Fe(II)/SPC systems. However, higher removal rates of radical probe compounds was observed in the HAH/CA/Fe(II)/SPC system, indicating that HAH addition enhanced the generation of both free radicals. In addition, increased contribution of O2•- in the HAH/CA/Fe(II)/SPC system compared to the CA/Fe(II)/SPC system was verified by free-radical scavengers tests. Complete TCE dechlorination was indicated based on the total mass balance of released Cl- species. Lower concentrations of formic acid were produced in the later stages of the reaction for the HAH/CA/Fe(II)/SPC system, suggesting that HAH addition favors complete TCE mineralization. Studies of the impact of selected groundwater matrix constituents indicates that TCE removal in the HAH/CA/Fe(II)/SPC system is pH-dependent, with higher removal rates under acidic conditions. Although HCO3- was observed to have an adverse impact on TCE removal for the HAH/CA/Fe(II)/SPC system, the addition of HAH reduced its inhibitory effect compared to the CA/Fe(II)/SPC system. Finally, TCE removal in real groundwater was greater with the addition of HAH to the CA/Fe(II)/SPC system. The study results indicate that HAH amendment has potential to enhance effective remediation of TCE-contaminated groundwater.

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Development of KMnO4-releasing composites for in situ chemical oxidation of TCE-contaminated groundwater

Cited by 57 publications

References 45 publications

Chitosan Encapsulation of FerrateVI for Controlled Release to Water:Mechanistic Insights and Degradation of Organic Contaminant

Chitosan Encapsulation of FerrateVI for Controlled Release to Water:Mechanistic Insights and Degradation of Organic Contaminant

Modeling the release and spreading of permanganate from aerated slow-release oxidants in a laboratory flow tank

Enhanced effect of HAH on citric acid-chelated Fe(II)-catalyzed percarbonate for trichloroethene degradation

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