Behavior and mechanism of low-concentration rare earth ions precipitated by the microbial humic-like acids

Wang, Junfeng; Li, Hai; Tang, Linwang; Zhong, Changming; Liu, Yaqi; Lu, Liuxian; Qiu, Tingsheng; Liu, Haolin

doi:10.1007/s11356-020-08521-w

Cited by 8 publications

(1 citation statement)

References 19 publications

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“…HS represents a large portion of natural OM in soils and typically consists of humic acid (HA), fulvic acid (FA) and humin (Newcomb 2015; Koivula and Hänninen 2001). Due to its complex structural characteristics and functional groups, HS has a strong adsorption complexation capacity that can react with inorganic or organic pollutants (Wang et al 2020;Piccolo et al 2021). Non-humic substances are composed of more labile organic matter (LOM) that include free particulate organic matter (free-POM) and occluded particulate organic matter (occluded-POM) (Rodionov et al 2000;Six et al 2008;Six et al 2002).…”

Section: Introductionmentioning

confidence: 99%

Efficiency and mechanism of phosphorus removal by iron-organic matter associations in peatland

Yang

Xiang

Bao

et al. 2022

Preprint

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This study was carried out to evaluate the efficiency and mechanism of P removal by different types of Fe-OM associations in peatlands. Humic substance (HS) and particulate organic matter (POM) were isolated from peat soils, and different types of iron-organic matter associations (Fe-HS and Fe-POM) were prepared. In addition, the natural combination of Fe3+ with peat was simulated. Then, isothermal adsorption experiments were carried out on the synthesized Fe-OM and iron-contained peat soils. All the adsorption data can be well fitted by the Langmuir adsorption model. The theoretical maximum adsorption capacity (Qmax) of Fe-HS associations can reach 36.90 mg/g, which is approximately two times higher than that of ferrihydrite (19.23 mg/g) and ten times higher than that of hematite (3.26 mg/g) and goethite (2.08 mg/g). The adsorption capacities of peat soils and POM were significantly enhanced by combinations with exogenous Fe3+. The Qmax of the original peat and iron-contained peat were 2.83 mg/g and 7.36 mg/g, respectively, and those of the original POM and Fe-POM association were 4.31 mg/g and 5.89 mg/g, respectively. The contribution of Fe-OM associations to phosphorus removal in peatlands is much higher than that of inorganic iron oxide. In addition, exogenous Fe3+ could also participate in other phosphorus removal processes.

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