A new strategy using nanoscale zero-valent iron to simultaneously promote remediation and safe crop production in contaminated soil

Liu, Yangzhi; Wu, Ting; White, Jason C.; Lin, Daohui

doi:10.1038/s41565-020-00803-1

Cited by 169 publications

(85 citation statements)

References 53 publications

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“…The development of nanoscience provides a new direction for the advancement of soil remediation [ 42 ]. Due to the unique properties, NPs not only have a better repair effect than traditional materials but also can add some new functions [ 43 ].…”

Section: Introductionmentioning

confidence: 99%

Application of Nanoparticles Alleviates Heavy Metals Stress and Promotes Plant Growth: An Overview

et al. 2020

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Nanotechnology is playing a significant role in addressing a vast range of environmental challenges by providing innovative and effective solutions. Heavy metal (HM) contamination has gained considerable attention in recent years due their rapidly increasing concentrations in agricultural soil. Due to their unique physiochemical properties, nanoparticles (NPs) can be effectively applied for stress alleviation. In this review, we explore the current status of the literature regarding nano-enabled agriculture retrieved from the Web of Science databases and published from January 2010 to November 2020, with most of our sources spanning the past five years. We briefly discuss uptake and transport mechanisms, application methods (soil, hydroponic and foliar), exposure concentrations, and their impact on plant growth and development. The current literature contained sufficient information about NPs behavior in plants in the presence of pollutants, highlighting the alleviation mechanism to overcome the HM stress. Furthermore, we present a broad overview of recent advances regarding HM stress and the possible mechanism of interaction between NPs and HM in the agricultural system. Additionally, this review article will be supportive for the understanding of phytoremediation and micro-remediation of contaminated soils and also highlights the future research needs for the combined application of NPs in the soil for sustainable agriculture.

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Section: Introductionmentioning

confidence: 99%

Application of Nanoparticles Alleviates Heavy Metals Stress and Promotes Plant Growth: An Overview

et al. 2020

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“…The increase in Fe content in pore water also explained the enhanced formation of iron plaques under the application of ZVI, RH and their combinations (Figure 3). However, Liu et al (2020) found that the addition of 100 or 1 000 mg/kg NZVI significantly increased the Fe content in roots and iron plaques, but NZVI at 1 000 mg/kg decreased the Fe content in grains, stems and leaves, which indicated a toxic effect on rice plants due to altered micronutrient uptake.…”

Section: Resultsmentioning

confidence: 92%

“…The biomass of shoots and roots was observably promoted by RH application. A recent report by Liu et al (2020) showed that the biomass of 30 and 70-day-old rice plants increased with 100 mg/kg NZVI in paddy soil contaminated with pentachlorophenol but de-Figure 2. Effects of zero-valent iron (ZVI) (ZVI1: 0.05%, ZVI2: 0.2%), rice husk (RH) (5%) and their combinations on Fe content of iron plaque, root, shoot and grain of rice plant grown in As or Cd spiked soil.…”

Section: Resultsmentioning

confidence: 97%

“…Our result was in line with the findings of Qiao et al (2018), who showed that ZVI (0.05%) enhanced iron plaque formation in rice plants under As stress, and Hu et al (2020), who found that the amount of Fe in iron plaques can be increased with more than 0.2% ZVI addition. Liu et al (2020) showed that NZVI at 100 or 1 000 mg/kg altered root morphology by inducing the formation of iron plaques in rice plants. The increase in Fe content in pore water also explained the enhanced formation of iron plaques under the application of ZVI, RH and their combinations (Figure 3).…”

Section: Resultsmentioning

confidence: 99%

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Influence of zero-valent iron and rice husk on As and Cd uptake in rice

Guo¹,

Wang²,

Hu³

et al. 2021

Plant Soil Environ.

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Zero-valent iron (ZVI) and rice husk (RH) have potential as adsorbents for heavy metals; however, their effects on iron plaque formation and heavy metal uptake by plants are still unclear. In this study, the impacts of ZVI, RH and their combinations on iron plaque formation on the root surface and the uptake of As and Cd by rice plants were investigated. A pot experiment was performed under waterlogged conditions using As<sup>(III)</sup>- or Cd<sup>(II)</sup>-spiked soil. The results showed that ZVI (0.05% or 0.2%) with or without RH significantly increased iron plaque formation and Fe contents in rice plants and pore water. Under As treatment, ZVI (0.05% or 0.2%) without or with RH obviously increased the As content in plaques and reduced the As content in grains by 67% and 66% and 19% and 24%, respectively. The Cd content was markedly increased in iron plaques and reduced in roots, shoots and grains by ZVI and RH. ZVI (0.05% or 0.2%), RH and their combinations reduced the grain Cd content by 61, 62, 60, 68 and 69%. These findings suggest that ZVI is effective in hindering As and Cd uptake by rice with or without RH in paddies contaminated with As or Cd.

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“…Despite nZVI type and concentration, the AM colonization rate of inoculated plants reached as high as 20%, even in the roots exposed to 1000 mg/kg nZVI, indicating a high tolerance of A. melllea ZZ to nZVI toxicity, and their combined applications. Both AM fungi and appropriate nZVI can benefit plant nutrient uptake and growth, and safe crop production in contaminated soils [ 12 , 13 , 54 , 55 ]. It is necessary to select and introduce tolerant AM fungal strains to encounter nZVI toxicity during the nanoremediation program.…”

Section: Discussionmentioning

confidence: 99%

Contribution of Nano-Zero-Valent Iron and Arbuscular Mycorrhizal Fungi to Phytoremediation of Heavy Metal-Contaminated Soil

et al. 2021

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Soil pollution with heavy metals has attracted increasing concern, which calls for the development of new remediation strategies. The combination of physical, chemical, and biological techniques can achieve more efficient remediation. However, few studies have focused on whether nanomaterials and beneficial microbes can be jointly used to facilitate phytoremediation. Therefore, we studied the role of nano-zero-valent iron (nZVI) and arbuscular mycorrhizal (AM) fungi in the phytoremediation of an acidic soil polluted with Cd, Pb and Zn, using sweet sorghum. X-ray diffraction (XRD), energy dispersive X-ray spectroscopy (EDS), and mapping analyses were conducted to explore the mechanisms of metal immobilization by nZVI. The results showed that although both bare nZVI (B-nZVI) and starch-stabilized nZVI (S-nZVI) inhibited root mycorrhizal colonization, Acaulospora mellea ZZ successfully colonized the plant roots. AM inoculation significantly reduced the concentrations of DTPA-Cd, -Pb, and -Zn in soil, and the concentrations of Cd, Pb, and Zn in plants, indicating that AM fungi substantially facilitated heavy metal immobilization. Both B-nZVI and S-nZVI, ranging from 50 mg/kg to 1000 mg/kg, did not impede plant growth, and generally enhanced the phytoextraction of heavy metals. XRD, EDS and mapping analyses showed that S-nZVI was more susceptible to oxidation than B-nZVI, and thus had more effective immobilization effects on heavy metals. Low concentrations of nZVI (e.g., 100 mg/kg) and AM inoculation had synergistic effects on heavy metal immobilization, reducing the concentrations of Pb and Cd in roots and enhancing root Zn accumulation. In conclusion, our results showed that AM inoculation was effective in immobilizing heavy metals, whereas nZVI had a low phytotoxicity, and they could jointly contribute to the phytoremediation of heavy metal-contaminated soils with sweet sorghum.

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A new strategy using nanoscale zero-valent iron to simultaneously promote remediation and safe crop production in contaminated soil

Cited by 169 publications

References 53 publications

Application of Nanoparticles Alleviates Heavy Metals Stress and Promotes Plant Growth: An Overview

Application of Nanoparticles Alleviates Heavy Metals Stress and Promotes Plant Growth: An Overview

Influence of zero-valent iron and rice husk on As and Cd uptake in rice

Contribution of Nano-Zero-Valent Iron and Arbuscular Mycorrhizal Fungi to Phytoremediation of Heavy Metal-Contaminated Soil

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