Nanoencapsulation of arsenate with nanoscale zero-valent iron (nZVI): A 3D perspective

Liu, Airong; Wang, Wei; Liu, Jing; Fu, Rongbing; Zhang, Wei‐xian

doi:10.1016/j.scib.2018.12.002

Cited by 42 publications

(23 citation statements)

References 49 publications

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“…As one of the main ingredients in soil minerals, iron is the most important transitional element. Iron oxide is the abundant metal oxide in the soil and has a relatively high activity (Liu, Wang, Liu, Fu, & Zhang, 2018). Some researchers have shown that iron oxide changes soil fertility and plays an important role in soil carbon sequestration (Imashuku, Tsuneda, & Wagatsuma, 2020).…”

Section: Introductionmentioning

confidence: 99%

Soft rock increases the colloid content and crop yield in sandy soil

Guo¹,

Zhang²,

Wang³

2020

Agronomy Journal

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Desertification is reducing the amount of land available to produce food in semi arid and arid regions worldwide. Management techniques to reduce this problem are needed. This paper investigated if the addition of soft rocks to sandy soils would improve soil resilience and productivity. The model system selected for this study was located in Mu Us, China. Soft rocks are defined as a loose rock layer. Collected soft rock and sand from the same study area were compounded in the volume ratios of 0:1 (CK), 1:5 (C1), 1:2 (C2), and 1:1 (C3). The results revealed that the average content of soil organic carbon (SOC) with increasing soil depth and was 3.11 g kg −1 in the 20 to 30 cm soil depth. The highest average content of particulate organic carbon (POC) was observed in the 10-20 cm soil layer (2.72 g kg −1 ). In the 10 to 20 cm soil depth, the polysaccharide content was the highest (125.3 and 119.08 μg g −1 ) in the C1 and C2 treatments. However, in all soil layers the C2 treatment had the highest (0.11 g kg −1 ) content of calcium carbonate. Compared with the CK treatment, the addition of soft rock increased of corn yield, the C2 treatment had the largest increase (65.46%). The corn yield showed a significantly positive correlation with polysaccharides at 10-20 cm. The overall results showed that soft rock o sand ratio of 1:2 could increase the crops yield, which was of great significance to the sustainable development of agriculture in the sand area.

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Section: Introductionmentioning

confidence: 99%

Soft rock increases the colloid content and crop yield in sandy soil

Guo¹,

Zhang²,

Wang³

2020

Agronomy Journal

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“…Achieving a comprehensive concept of the architectural genesis of metal(loid)s with iron nanoparticles is of great importance for recovering metal(loid)s from the reacted iron nanoparticles in water, improving the synthesis of more functional and robust iron-based nanoparticles, and understanding the underlyingly interfacial chemistry. In recent years, various technologies including state-of-the-art spherical aberration-corrected scanning transmission electron microscopy (Cs-STEM) coupled with the X-ray energy dispersive spectroscopy (XEDS) and electron energy-loss spectroscopy (EELS) along with some common methods such as X-ray photoelectron spectroscopy (XPS) and STEM integrated with energy dispersive X-ray spectroscopy (STEM-EDX) have been applied to track the structural evolution of iron nanoparticles when they react with metal(loid)s. ,,,,,, Figure systematically summarizes the architectural genesis of different metal(loid)s with a single iron nanoparticle schematized from previous studies. ,,− ,− Carefully analyzing the published results can allow us to divide the architectural growths of metal(loid)s with iron nanoparticles into five categories.…”

Section: Architectural Growths Of Metal(loid)s With Iron Nanoparticle...mentioning

confidence: 99%

“…Since the oxyanion metalloids such as As(III)/As(V), Se(VI), and Cr(VI) are electronegative, they can be preferentially attracted to or chemically bound to the shell of iron (hydr)oxide before they are reduced by the iron core. With the progress in the reaction, the adsorbed metalloids can be reduced via the sacrificial oxidation of the iron inner core, and the reduced metalloids can transport across the defects of the iron (hydr)oxide shell simultaneously, ,,,− thereby forming the metalloid “subshell” beneath the shell of an iron nanoparticle (Figure b). ,,, As for the As-subshell, As was predominantly accumulated at the subsurface (∼3 nm from the shell) of the iron nanoparticle, and the thickness was in the range of 1.0–2.3 nm. , Zhang’s group revealed that the reaction of an iron nanoparticle with As(V) was capable of generating the As(III)-subshell and then converting into As(0)-subshell in solutions. ,,,,, Correspondingly, the Fe species of the As-laden iron nanoparticle could be well stratified from the outermost Fe(III) (hydr)oxide periphery to a mixed Fe(III)/Fe(II) interlayer, then Fe(II) and pure Fe(0) phases . Compared to the reduction of As(III) to As(0), which was strongly dependent on the loading of Fe 0 , it should be noted that the As(III) could be oxidized back to As(V) in the presence of iron nanoparticles and oxygen .…”

Section: Architectural Growths Of Metal(loid)s With Iron Nanoparticle...mentioning

confidence: 99%

“…Therefore, the core–shell structure leads to iron nanoparticles having multiple functions, and iron nanoparticles can sequestrate various metal(loid)s (e.g., Au(III), Ag(I), Cu(II), Cr(VI), Se(IV)/Se(VI), As(III)/As(V), Co(II), Ni(II), and Zn(II), etc. ), ,,,− through a mixture of transformation, adsorption, complexation, and/or coprecipitation processes. , In most cases, nFe 0 and the target metal(loid) are of the reducing agent (anode) and oxidizing agent (cathode), respectively. Therefore, the key determinant for the transformation mechanism of a metal(loid) by the core–shell iron nanoparticles is the standard redox potential ( E 0 ) of the metal(loid) relative to that of the Fe 0 .…”

Section: Introductionmentioning

confidence: 99%

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Architectural Genesis of Metal(loid)s with Iron Nanoparticle in Water

Guan

Zhang

2021

Environ. Sci. Technol.

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Reactions of core–shell iron nanoparticles with metal(loid)s in water can form an array of nanostructures such as Ag-seed/dendrite, As-subshell, U-yolk, Co-hollowshell, and Cs-spot. Nonetheless, there is a lack of profound understanding in the genesis of these amazing geometries. Herein, we propose a concept to unravel the interdiffusion between the core–shell iron nanoparticle and metal(loid)s, where several key interactions including the Kirkendall effect, metal(loid) character effect, and reaction condition effect are involved in determining the structure of the final solid reaction products. Particularly, the architectural growths of metal(loid)s with iron nanoparticles in water can be manipulated mutually or singly by the following factors: standard redox potential difference, magnetic property, electrical charge and conductivity, as well as the iron (hydr)oxide shell structure under different solution chemistry and operation conditions. This contribution provides a theoretical basis to rationalize the architectural genesis of various metal(loid)s with iron nanoparticles, which will benefit the real practice for synthesizing functional iron-based nanoparticles and recovering the rare/precious metal(loid)s by iron nanoparticles from water.

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“…oxidation of iron, thus facilitating the reduction of NO 2 À to N 2 [50,51]. Reduced NH 4 + with continuous production of N 2 was because NH 4 + may be oxidized to N 2 by generated HClO, owing to the break-point oxidation of ammonia with chlorine [51][52][53].…”

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confidence: 99%