Total immobilization of soil heavy metals with nano-Fe/Ca/CaO dispersion mixtures

Mallampati, Srinivasa Reddy; Mitoma, Yoshiharu; Okuda, Tetsuji; Sakita, Shogo; Kakeda, Mitsunori

doi:10.1007/s10311-012-0384-0

Cited by 54 publications

(14 citation statements)

References 30 publications

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“…Radionuclide 90 Sr, one of the main nuclear wastes, has gained a wide attention due to its long half‐life period (28 years) and high beta radiant energy (0.546 MeV) . In recent years, many efforts have been made to immobilize 90 Sr using various encapsulation matrix such as cementitious materials, glass, ceramics, crystalline zirconium phosphate, and nanoparticle additives . However, a robust way to storage Sr with high immobilization performance, stable chemical stability, and economy benefits is still lacking.…”

Section: Introductionmentioning

confidence: 99%

Immobilization behavior of Sr in geopolymer and its ceramic product

Lou

Jia

et al. 2019

J Am Ceram Soc

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To date, geopolymer has emerged as a promising and inexpensive precursor with potential application in trapping hazardous elements via physical encapsulation or chemical bonding. In this work, different high‐temperature products derived from Sr‐contained geopolymer precursors were prepared. Different to conventional hazardous elements that immobilized in the geopolymer precursor, which show decreasing leaching rates after high‐temperature treatments, leaching rates of Sr in the resulting high‐temperature products first increase and then decrease with the increasing heating temperature. Herein, we first shed light on the underlying reasons of such temperature‐dependent leaching behaviors by investigating effects of heating temperature on the phase composition, microstructure, and immobilization mechanism. Moreover, a novel immobilization strategy has been proposed based on the blocking effect of formed nepheline structures at 1200°C. Using this strategy, the leaching rate of Sr reduced to 5.82 × 10−7g cm−2 d−1 in the deionized water.

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Section: Introductionmentioning

confidence: 99%

Immobilization behavior of Sr in geopolymer and its ceramic product

Lou

Jia

et al. 2019

J Am Ceram Soc

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“…Indeed, on the FA surfaces, association of Ca/[PO 4 ]/H 2 O/[CO 3 ] compounds are present (e.g. apatite—Ca 10 (PO 4 ) 6 (OH) 2 ), calcium carbonate—CaCO 3 , or calcium hydroxide—Ca(OH) 2 ) (Figure b) .…”

Section: Resultsmentioning

confidence: 99%

Novel separation and immobilization of heavy metals in municipal solid waste fly ash by grinding with nano‐Fe/Ca/CaO/[PO₄] mixture

Mallampati

Simion

Mitoma

2016

Env Prog and Sustain Energy

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This study was conducted to examine the dry synthesis and application of novel nano‐size calcium/iron‐based composite material as a separation/immobilization treatment of heavy metals (As, Cd, Cr, and Pb) in fly ash from municipal solid waste incinerator. After grinding with nano‐Fe/Ca/CaO and with nano‐Fe/Ca/CaO/[PO4], approximately 30 wt % and 25 wt % of magnetic fraction fly ash were separated. The highest amount of entrapped heavy metals was found in the lighter, magnetically‐separated fly ash fraction (i.e. 91% heavy metals in 25% treated fly ash). Immobilization rate of heavy metals in the magnetic or non‐magnetic fly ash fractions were about 98% and 100%, respectively. SEM‐EDS observations indicate that the main fraction of enclosed/bound materials on treated fly ash includes Ca/PO4‐associated crystalline complexes. After nano‐Fe/Ca/CaO/[PO4] treatment, the heavy metal concentrations in the fly ash leachate were much lower than the Japan standard regulatory limit for hazardous waste landfills. The addition of a nano‐Fe/Ca/CaO/PO4 mixture with simple grinding technique is potentially applicable for the remediation and volume reduction of fly ash contaminated by heavy metals. © 2016 American Institute of Chemical Engineers Environ Prog, 35: 1693–1698, 2016

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“…These nanoparticles have four missions in soil nanoremediation including (1) reducing the soil heavy metal concentration in leachates to acceptable level, (2) immobilization of soil heavy metals (e.g. Cr VI, Pb II, As III and Cd) in polluted soils (Mallampati et al 2013;ElRamady et al 2017), (3) remediation the redox potential enhancing the convert of some soil heavy metals (like Cr VI) to less toxic forms and (4) degradation of organic contaminants (e.g. DDT, chlorinated organic solvents, carbamates, etc) (Abhilash et al 2016;Saha et al 2017f).…”

Section: Environmrntal Nanoremediation Under Climate Changementioning

confidence: 99%

Environmental Nanoremediation under Changing Climate

El-Ramady

Alshaal

El-Henawy

et al. 2017

EBSS

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MANY global problems threaten our life on the Planet including climate changes, environmental pollution, food and soil security, energy crisis, etc. This environmental pollution has not only mainly serious risks and stress involving the human health and safety of the entire ecosystem but also the quantity and quality of crops productivity worldwide. Due to the great gap between the global food production and the global consumption, there is a crucial need to cultivate these contaminated lands sooner or later. Therefore, the removing of pollutants from soils and waters should be performed in frame of sustainable remediation and sustainable energy production accordingly. Depending on many factors (source and kind of pollutants, land use and the economics of water and soil resources, etc) many strategies should be addressed for the sustainable and integrated management of polluted lands. Nanoremediation is a promising strategy in controlling pollution and management. Three major applications of nanoremediation could be characterized including detection of pollution using nanosensors, prevention of pollution, purification and remediation of contamination. Further studies also concerning the impact of changing climate on the nanoremediation process in the agroecosystems should be considered. Thus, this review will focus on the evaluation of environmental nanoremediation and its strategy in polluted lands under climate changes. Using of nanotechnology in pollution control as well as the environmental pollution and its sustainable management also will be highlighted.Keywords: Environmental nanoremediation, Climate change, Pollution, Crop production, Environmental stress. IntroductionClimate changes are a great challenge facing the human kind as well as other living things. The production of crops and other agricultural features are extremely susceptible to changes in climate. So, these global changes will be caused major shifts in crop distribution due to climate changes in the future. Moreover, it has been estimated that climate changes are likely to reduce yields and/or damage crops in the 21 Removing of pollutants from soils and waters could be linked with both the sustainable remediation as well as sustainable energy production (Kovacs and Szemmelveisz 2017; Zheng and Shi 2017). Many strategies for the sustainable and integrated management of polluted lands should be addressed depending on several factors e.g., type of pollutants and their level, the purpose of land use after remediation, soil characterization and its topography, climate , cropping patterns and the availability of resources and their economics (El-Ramady et al. 2017;Saha et al. 2017a). Furthermore, a great debate concerning using of lands for crop food production (under growing global population) or energy crop production was and still for ages (Paschalidou et al. 2016). Therefore, a global and holistic strategy in facing the main three threats including hunger, lack of energy and pollution of environment as well as climate changes should be esta...

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Total immobilization of soil heavy metals with nano-Fe/Ca/CaO dispersion mixtures

Cited by 54 publications

References 30 publications

Immobilization behavior of Sr in geopolymer and its ceramic product

Immobilization behavior of Sr in geopolymer and its ceramic product

Novel separation and immobilization of heavy metals in municipal solid waste fly ash by grinding with nano‐Fe/Ca/CaO/[PO₄] mixture

Environmental Nanoremediation under Changing Climate

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Total immobilization of soil heavy metals with nano-Fe/Ca/CaO dispersion mixtures

Cited by 54 publications

References 30 publications

Immobilization behavior of Sr in geopolymer and its ceramic product

Immobilization behavior of Sr in geopolymer and its ceramic product

Novel separation and immobilization of heavy metals in municipal solid waste fly ash by grinding with nano‐Fe/Ca/CaO/[PO4] mixture

Environmental Nanoremediation under Changing Climate

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Novel separation and immobilization of heavy metals in municipal solid waste fly ash by grinding with nano‐Fe/Ca/CaO/[PO₄] mixture