Sorption of Cu2+ on humic acids sequentially extracted from a sediment

Yang, Kun; Miao, Gangfen; Wu, Wenhao; Lin, Daohui; Pan, Bo; Wu, Fengchang; Xing, Baoshan

doi:10.1016/j.chemosphere.2015.07.061

Cited by 63 publications

(23 citation statements)

References 35 publications

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“…They could also be extracted from leonardite and lignite. With abundant functional groups (e.g., quinone, amino, carboxylic, phenolic), leonardite-derived HA (L-HA) has a good propensity to bind metal cations (Olivella et al, 2002;Yang et al, 2015).…”

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confidence: 99%

Removing uranium (VI) from aqueous solution with insoluble humic acid derived from leonardite

Meng

Yuan

Larson

et al. 2017

Journal of Environmental Radioactivity

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The occurrence of uranium (U) and depleted uranium (DU)-contaminated wastes from anthropogenic activities is an important environmental problem. Insoluble humic acid derived from leonardite (L-HA) was investigated as a potential adsorbent for immobilizing U in the environment. The effect of initial pH, contact time, U concentration, and temperature on U(VI) adsorption onto L-HA was assessed. The U(VI) adsorption was pH-dependent and achieved equilibrium in 2 h. It could be well described with pseudo-second-order model, indicating that U(VI) adsorption onto L-HA involved chemisorption. The U(VI) adsorption mass increased with increasing temperature with maximum adsorption capacities of 91, 112 and 120 mg g at 298, 308 and 318 K, respectively. The adsorption reaction was spontaneous and endothermic. We explored the processes of U(VI) desorption from the L-HA-U complex through batch desorption experiments in 1 mM NaNO and in artificial seawater. The desorption process could be well described by pseudo-first-order model and reached equilibrium in 3 h. L-HA possessed a high propensity to adsorb U(VI). Once adsorbed, the release of U(VI) from L-HA-U complex was minimal in both 1 mM NaNOand artificial seawater (0.06% and 0.40%, respectively). Being abundant, inexpensive, and safe, L-HA has good potential for use as a U adsorbent from aqueous solution or immobilizing U in soils.

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confidence: 99%

Removing uranium (VI) from aqueous solution with insoluble humic acid derived from leonardite

Meng

Yuan

Larson

et al. 2017

Journal of Environmental Radioactivity

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“…For example, sorption of Cu can outcompete Ni, due to stronger bond formation (Ho et al, ). Copper is especially strongly binding to organic matter (Yang et al, ), which explains the large oxidizable fraction determined by sequential extraction and the large colloidal DOM fraction determined by AF4 for Cu. Ni could potentially sorb to microbial biomass under low pH conditions (Zandvoort et al, ), but that would depend on the composition of the organic material, that is, the availability of organic ligands that deprotonates at low pH.…”

Section: Discussionmentioning

confidence: 99%

Biogeochemical Behavior of Metals Along Two Permeable Reactive Barriers in a Mining‐Affected Wetland

et al. 2019

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The biogeochemistry of two alkaline permeable reactive barriers (PRBs) installed for remediation in a mining-affected wetland was investigated in order to assess the importance of colloidal particles on metal removal processes in such systems. At the time of investigation, both PRBs were effective in removing U, Cu, and Zn (>95%) from groundwater but were slightly less efficient for Ni and Co (<90%). Previously installed groundwater wells allowed an in-depth analysis of groundwater passing through the first PRB. Here, in an alkaline environment (pH 6.0-9.7), 11-14% of Ni, 36-37% of Co, 77-81% of Cu, 14-17% of U, and 10-19% of Fe were associated with organic matter and inorganic colloids, while upgradient in the more acidic environments (pH <6.0), ionic species and complexes (e.g., Co 2+ , Ni 2+ , Cu 2+ , and UO 2 H 3 SiO 4 + ) dominated. Copper and U preferentially bound to larger colloidal fractions (>1 kDa), which might have promoted their sequestration. Uranium removal was likely further enhanced by U (VI) reduction in the alkaline and oxygen-depleted conditions of the PRBs. The less efficient removal of Ni and Co, being target metals for remediation, was explained by a combination of their high solubility, unfavorable redox and pH conditions created by the alkaline PRBs, and their limited association with colloidal particles. These considerations are critical in the design of future PRBs for the remediation of similar systems.Plain Language Summary Permeable reactive barriers are a technology often applied to treat contaminated groundwater. In this study, the biogeochemistry of two alkaline barriers, placed in a wetland near a decommissioned uranium mine, was investigated. At the time of investigation, both reactive barriers were effective in removing uranium, copper, and zinc from groundwater but were less efficient for nickel and cobalt. Using previously installed groundwater wells, we conducted an in-depth analysis of groundwater passing through the first barrier. The alkaline and oxygen-depleted environment promoted the formation of colloids, which potentially contributed to the effective removal of copper and uranium, while the surrounding acidic wetland promoted the transport of ionic metal species. At the reactive barriers, uranium removal was further enhanced by uranium reduction to more immobile uranium forms through reduced chemical species and the activity of bacteria. The less efficient removal of nickel and cobalt was explained by their high solubility, unfavorable conditions created by the alkaline reactive barriers, and their limited association with colloids. This work provides new insights into future uses of permeable reactive barrier technology for metal remediation in wetlands.

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“…Apparently, HA had the highest OM content up to 38.5%, which was consistent with the previous report. 28 The content of metal oxide (referred to Fe 2 O 3 and Al 2 O 3 ) of ROM and ROX decreased by 19.2% and 85.7% in comparison with BS, respectively, which was attributed to the fact that metal oxide might be tightly binding to the organic matter, resulting in the decrease in content of metal oxide. The clay content of ROM and ROX increased to 31.53% and 28.92% in comparison with 22.01% of BS, respectively.…”

Section: Characterization Of Natural Black Soil and Three Treated Soilsmentioning

confidence: 94%

The role of soil components in the sorption of tetracycline and heavy metals in soils

et al. 2018

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Sorption of Cu2+ on humic acids sequentially extracted from a sediment

Cited by 63 publications

References 35 publications

Removing uranium (VI) from aqueous solution with insoluble humic acid derived from leonardite

Removing uranium (VI) from aqueous solution with insoluble humic acid derived from leonardite

Biogeochemical Behavior of Metals Along Two Permeable Reactive Barriers in a Mining‐Affected Wetland

The role of soil components in the sorption of tetracycline and heavy metals in soils

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