Effect of humic acid on uranium(VI) retention and transport through quartz columns with varying pH and anion type

Du, Linfang; Li, Shicheng; Li, Xiaolong; Wang, Ping; Huang, Zhaoya; Tan, Zhijian; Liu, Chunli; Liao, Jiali; Liu, Ning

doi:10.1016/j.jenvrad.2017.06.016

Cited by 25 publications

(10 citation statements)

References 35 publications

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“…Our results show that the soluble U concentration in the presence of NOM is affected by pH and reaction time. Several experimental and modeling studies reported the effect of humic acid (HA) and fulvic acid on U mobility through adsorption and complexation. ,,, However, there are limited studies reporting adsorption and desorption of U onto NOM. , The adsorption of U–humic complexes onto quartz was enhanced between pH 3 and 6 . The soluble U concentration reported in this study likely decreased after 0.5 h by the adsorption of uranyl ions onto the POM.…”

Section: Discussionmentioning

confidence: 60%

“…24,32 The adsorption of U−humic complexes onto quartz was enhanced between pH 3 and 6. 20 The soluble U concentration reported in this study likely decreased after 0.5 h by the adsorption of uranyl ions onto the POM. Consistent with our results, the adsorption of U onto other minerals and sediments has been observed to take place within 0.5 h. 33,34 Environmental Science & Technology For instance, rapid adsorption of U onto ferrihydrite, independent of pH, has been observed within minutes of the reaction.…”

Section: Effect Of Nom On U Solubility Experiments At Phmentioning

confidence: 57%

“…For example, at low pH, U forms bidentate surface complexes with NOM carboxylate groups . Adsorption of UO 2 2+ onto solid NOM has been demonstrated in the pH range of 4–6, in which aqueous U-humate complexes are also predominant. , More specifically, DOM can form soluble complexes with U, whereas POM removes U from solution through adsorption reactions. − …”

Section: Introductionmentioning

confidence: 99%

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From Adsorption to Precipitation of U(VI): What is the Role of pH and Natural Organic Matter?

Velasco

Brearley

Gonzalez‐Estrella

et al. 2021

Environ. Sci. Technol.

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We investigated interfacial reactions of U(VI) in the presence of Suwannee River natural organic matter (NOM) at acidic and neutral pH. Laboratory batch experiments show that the adsorption and precipitation of U(VI) in the presence of NOM occur at pH 2 and pH 4, while the aqueous complexation of U by dissolved organic matter is favored at pH 7, preventing its precipitation. Spectroscopic analyses indicate that U(VI) is mainly adsorbed to the particulate organic matter at pH 4. However, U(VI)-bearing ultrafine to nanocrystalline solids were identified at pH 4 by electron microscopy. This study shows the promotion of U(VI) precipitation by NOM at low pH which may be relevant to the formation of mineralized deposits, radioactive waste repositories, wetlands, and other U- and organic-rich environmental systems.

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Section: Discussionmentioning

confidence: 60%

Section: Effect Of Nom On U Solubility Experiments At Phmentioning

confidence: 57%

Section: Introductionmentioning

confidence: 99%

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From Adsorption to Precipitation of U(VI): What is the Role of pH and Natural Organic Matter?

Velasco

Brearley

Gonzalez‐Estrella

et al. 2021

Environ. Sci. Technol.

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“…Dissolved humic substances facilitate the transport of U and other metals as a function of pH by affecting the sorption on mineral surfaces. 13-16 It has been reported that soluble U complexes with humic substances in peats. 17 The formation of U(VI)–humate complexes between pH 4 and 6 can influence sorption of U on NOM.…”

Section: Introductionmentioning

confidence: 99%

Organic Functional Group Chemistry in Mineralized Deposits Containing U(IV) and U(VI) from the Jackpile Mine in New Mexico

Velasco

Artyushkova

Ali

et al. 2019

Environ. Sci. Technol.

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We investigated the functional group chemistry of natural organic matter (NOM) associated with both U(IV) and U(VI) in solids from mineralized deposits exposed to oxidizing conditions from the Jackpile Mine, Laguna Pueblo, NM. The uranium (U) content in unreacted samples was 0.44-2.6% by weight determined by X-ray fluorescence. In spite of prolonged exposure to ambient oxidizing conditions, ≈49% of U(IV) and ≈51% of U(VI) were identified on U L III edge extended X-ray absorption fine structure spectra. Loss on ignition and thermogravimetric analyses identified from 13% to 44% of NOM in the samples. Carbonyl, phenolic, and carboxylic functional groups in the unreacted samples were identified by fitting of high-resolution X-ray photoelectron spectroscopy (XPS) C 1s and O 1s spectra. Peaks corresponding to phenolic and carbonyl functional groups had intensities higher than those corresponding to carboxylic groups in samples from the supernatant from batch extractions conducted at pH 13, 7, and 2. U(IV) and U(VI) species were detected in the supernatant after batch extractions conducted under oxidizing conditions by fitting of high-resolution XPS U 4f spectra. The outcomes from this study highlight *

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“…Modeling studies have investigated the mobility of U and other related radioisotopes in soils (Barnett et al 2000;Bradbury and Baeyens 2005;Dang et al 2018;Du et al 2017;Larson et al 2004). However, the focus of these studies has been primarily on U(VI), not DU.…”

Section: Migration Of Du In Soil and Sedimentmentioning

confidence: 99%

Corrosion and migration of zero-valent depleted uranium products in soil

Medina¹,

Wynter²,

Larson³

et al. 2018

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Effect of humic acid on uranium(VI) retention and transport through quartz columns with varying pH and anion type

Cited by 25 publications

References 35 publications

From Adsorption to Precipitation of U(VI): What is the Role of pH and Natural Organic Matter?

From Adsorption to Precipitation of U(VI): What is the Role of pH and Natural Organic Matter?

Organic Functional Group Chemistry in Mineralized Deposits Containing U(IV) and U(VI) from the Jackpile Mine in New Mexico

Corrosion and migration of zero-valent depleted uranium products in soil

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