Sustainable removal of soil arsenic by naturally-formed iron oxides on plastic tubes

Yuan, Zhao-Feng; Pu, Tong-Yao; Jin, Chen-Yu; Feng, Wei-Jia; Wang, Jiayue; Gustave, Williamson; Bridge, Jonathan; Cheng, Yili; Tang, Xianjin; Zhu, Yan; Chen, Zheng

doi:10.1016/j.jhazmat.2022.129626

Cited by 8 publications

(3 citation statements)

References 58 publications

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“…This may be attributed to two causes: (i) MAT does not significantly affect the availability of nutrients in the soil and (ii) the rice root exudates more chelating reagents to liberate nutrients from soil solids . The MAT method may be also applied to remediate other heavy metals that exhibit similar behavior to As, such as lead, cobalt, and vanadium. , Nonetheless, certain heavy metals such as cadmium and antimony behave differently from As, thus the persistent rise in saturated soil Eh levels can stimulate their mobilization, especially in soils contaminated with multiple heavy metals. Hence, further studies are necessary to optimize MAT’s setup in cocontaminated paddy soils.…”

Section: Resultsmentioning

confidence: 99%

“…Similar to aerenchymatous tissues, some synthetic materials are also permeable to O 2 , and they can be used to generate Fe hotspots in paddy soils. Previous studies have shown that atmospheric O 2 could diffuse through various plastic tubes inducing Fe(II) oxidation and the formation of Fe(III) (oxyhydr)oxide coatings on the tube walls that come into contact with saturated soil, , which is quite similar to Fe plaque formation on wetland plant roots. However, the Fe oxide coating can act as a barrier and significantly inhibits further diffusion of the O 2 from the tube wall to reduced soils, limiting their ability to immobilize As.…”

Section: Introductionmentioning

confidence: 99%

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Sustainable Immobilization of Arsenic by Man-Made Aerenchymatous Tissues in Paddy Soil

Yuan,

Zhou,

Chen

et al. 2023

Environ. Sci. Technol.

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Arsenic (As) is a major environmental pollutant and poses a significant health risk to humans through rice consumption. Elevating the soil redox potential (Eh) has been shown to reduce As bioavailability and decrease As accumulation in rice grains. However, sustainable methods for managing the Eh of rice paddies are lacking. To address this issue, we propose a new approach that uses man-made aerenchymatous tissues (MAT) to increase soil Eh by mimicking O 2 release from wet plant roots. Our study demonstrated that the MAT method sustainably increased the soil Eh levels from −119 to −80.7 mV (∼30%), over approximately 100 days and within a radius of around 5 cm from the surface of the MAT. Moreover, it resulted in a significant reduction (−28.5% to −63.3%) in dissolved organic carbon, Fe, Mn, and As concentrations. MAT-induced Fe(III) (oxyhydr)oxide minerals served as additional adsorption sites for dissolved As in soil porewater. Furthermore, MAT promoted the oxidation of arsenite to the less mobile arsenate by significantly enhancing the relative abundance of the aioA gene (130% increase in the 0−5 cm soil zone around MAT). The decrease in As bioavailability significantly reduced As accumulation in rice grains (−30.0%). This work offers a low-cost and sustainable method for mitigating As release in rice paddies by addressing the issue of soil Eh management.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Sustainable Immobilization of Arsenic by Man-Made Aerenchymatous Tissues in Paddy Soil

Yuan,

Zhou,

Chen

et al. 2023

Environ. Sci. Technol.

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“…27,28 In the presence of Fe(III) oxides, As(III) oxidation is believed to be limited under oxic conditions. 29 However, As(III) is efficiently oxidized with the existence of Fe(II) under oxic conditions, [30][31][32] due to the generation of radicals in the coexistence of Fe(III) and Fe(II). In particular, •OH is generated during Fe(II) oxidation to Fe(III) oxides by O 2 , 33 which can efficiently stimulate As(III) oxidation because of its strong oxidation ability.…”

Section: Introductionmentioning

confidence: 99%

Purification of As(iii) through oxidation of siderite and As(iii) by dissolved oxygen: behavior and mechanism

Yu,

Gao,

Guo

2024

Environ. Sci.: Nano

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Reduce methane emission from rice paddies by man-made aerenchymatous tissues

et al. 2023

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Methane is the second most important greenhouse gas after carbon dioxide, and 8–11% is emitted from paddy fields. Methanogenic microbial processes in water-saturated soils can be alleviated through the oxygenation of soils, which may hamper methane production and emissions in paddies. Here, by mimicking O2 release from rice roots, we report the use of man-made (i.e., silicone tube-based) aerenchymatous tissues (MAT) to continuously release O2 to abate methane emission from paddies. High O2-releasing rates (such as 5 kg O2/ha/d) can be easily achieved by adjusting MAT density (e.g., 0.2 m2 tube/m2 soil) and its inner air pressure (e.g., 25 kPa). Following deployment, MAT significantly increased soil redox potential (from -150 mV to -88.6 mV) and induced active iron redox cycling. This decreased the availability of organic substrates of methanogens and therefore dramatically reduced their abundance (-25.1% active mcrA gene). We quantified the decrease in methane emission both in mesocosms and paddy field trials and found in both setups that ~ 50% of methane emission was reduced. Moreover, we showed that the performance of MAT can be further improved by simply increasing the air pressure in MAT (e.g., -74.2% methane emission at 200 kPa air pressure). This work provides a powerful and sustainable method for mitigating methane emission from rice paddies. Graphical Abstract

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Sustainable removal of soil arsenic by naturally-formed iron oxides on plastic tubes

Cited by 8 publications

References 58 publications

Sustainable Immobilization of Arsenic by Man-Made Aerenchymatous Tissues in Paddy Soil

Sustainable Immobilization of Arsenic by Man-Made Aerenchymatous Tissues in Paddy Soil

Purification of As(iii) through oxidation of siderite and As(iii) by dissolved oxygen: behavior and mechanism

Reduce methane emission from rice paddies by man-made aerenchymatous tissues

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