The use of calcium carbonate-enriched clay minerals and diammonium phosphate as novel immobilization agents for mercury remediation: Spectral investigations and field applications

Wang, Jianxu; Xing, Ying; Xie, Yuanyan; Yuan, Meng; Xia, Jicheng; Feng, Xinbin

doi:10.1016/j.scitotenv.2018.07.225

Cited by 51 publications

(7 citation statements)

References 56 publications

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“…In addition, it was also observed that after just 14 days of curing, the material obtained stable strength properties. The recorded compressive strength values for alkali-activated materials, based on post-production raw material, are comparable to the results obtained for geopolymers produced from metakaolin [11].…”

Section: Methodssupporting

confidence: 80%

“…By using the alkaline activation process, it is also possible to obtain, for example, sorbents or synthetic zeolites [5][6][7][8][9]. Moreover, the clays containing high amounts of calcium carbonates can also be used for the production of binders [10] or for the immobilisation of mercury in remediation processes [11]. It is also known to use clay for wastewater treatment containing dyes [12].…”

Section: Introductionmentioning

confidence: 99%

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Characterisation of post-production raw material from the Raciszyn II deposit as a material suitable for the production of alkaline-activated materials

Łach

Hebdowska-Krupa

Stefańska

et al. 2019

J Therm Anal Calorim

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The clay is the basic raw material used in the production of a wide range of ceramic products. However, global guidelines encourage limiting the consumption of natural resources in the production process. For this reason, research is being conducted in developing technologies that enable the production of full-value products by using post-process materials. The article presents the properties of post-production clay sourced from the Jurassic limestone Raciszyn II deposit. In this study, the results of mineralogical (X-ray diffraction) and chemical (X-ray fluorescence) analysis of post-production raw material will be presented. In addition, the leachability in water and the natural radioactivity of the material were established, which determines the possibility of using the raw material in building applications. It was found that, because of the presence of minerals from the kaolinite group in the post-production raw material from Raciszyn II deposit, it is suitable for the production of alkaline-activated materials. However, it was necessary to determine the temperature range of its thermal treatment. The processes occurring in the post-production raw material during its heating were characterised by means of thermogravimetry, differential thermal analysis and mass spectroscopy thermal analysis-coupled techniques. The compressive strength properties of alkali-activated materials, produced from the post-process material from Raciszyn, analysed after 14 and 28 days of curing, were also presented.

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Section: Methodssupporting

confidence: 80%

Section: Introductionmentioning

confidence: 99%

Characterisation of post-production raw material from the Raciszyn II deposit as a material suitable for the production of alkaline-activated materials

Łach

Hebdowska-Krupa

Stefańska

et al. 2019

J Therm Anal Calorim

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“…However, such methods have limited application to productive agricultural soil due to high cost, and the degradation of soil physical, chemical, and biological properties that can result from remediation . Recent studies have shown that immobilization is a better approach to manage the risk of bioavailable Hg in paddy soil. − Selenium compounds, , elemental sulfur, and sulfate have been shown to immobilize Hg when used as a soil amendment although their application beyond laboratory scale is limited. The lack of any proven, reliable, and high-efficiency immobilization technology remains a key barrier for the use of such technology to manage the risk of Hg in productive farmlands.…”

Section: Introductionmentioning

confidence: 99%

Nanoactivated Carbon Reduces Mercury Mobility and Uptake by Oryza sativa L: Mechanistic Investigation Using Spectroscopic and Microscopic Techniques

Wang

Shaheen

Anderson

et al. 2020

Environ. Sci. Technol.

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Mercury (Hg) contamination of paddy field poses a health risk to rice consumers, and its remediation is a subject of global scientific attention. In recent years focus has been given to in situ techniques which reduce the risk of Hg entering the food chain. Here, we investigate the use of nanoactivated carbon (NAC) as a soil amendment to minimize Hg uptake by rice plants. Application of 1–3% NAC to soil (by weight) reduced Hg concentration in the pore water (by 61–76%) and its bioaccumulation in the tissues of rice plants (by 15–63%), relative to the corresponding control. Specifically, NAC reduced the Hg concentration of polished rice by 47–63% compared to the control, to a level that was 29–49% lower than the food safety value (20 ng g–1) defined by the Chinese government. The NAC induced a change in Hg binding from organic matter to nano-HgS in the soil as a function of soil amendment. This Hg speciation transformation might be coupled to the reduction of sulfoxide to reduced sulfur species (S0) by NAC. The NAC amendment may be a practical and effective solution to mitigate the risk of Hg transferring from contaminated soil to rice grains at locations around the world.

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“…Geogenic and anthropogenic soil contamination by mercury (Hg) has a global significance. , More than thousands of hotspots of Hg contamination occur in nonferrous metal (e.g., mercury, gold, lead, and zinc) mining and processing sites and industrial sites worldwide (Figure a). , The dispersion of Hg via solid wastes, liquid wastes, and gas from those hotspots has caused global soil contamination, particularly in farmlands. For instance, a recent national-wide soil surgery conducted by the Chinese government showed that over 1.9% of the collected soil samples are contaminated with Hg .…”

Section: Introductionmentioning

confidence: 99%

Mobilization, Methylation, and Demethylation of Mercury in a Paddy Soil Under Systematic Redox Changes

Wang

Shaheen

Min

et al. 2021

Environ. Sci. Technol.

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Methylmercury (MeHg) contamination in paddy fields is a significant environmental issue globally since over half of the population of our planet consumes rice. MeHg is a neurotoxin produced by microorganisms in oxygen-limited environments. Microbial effect on MeHg production is a hotspot of research; however, it has been largely ignored how the oxidation–reduction potential (E h) shapes MeHg formation. Here, we elucidated Hg (de)-methylation in a contaminated soil by increasing E h stepwise from −300 to +300 mV using a sophisticated biogeochemical microcosm. At the E h range from −300 to −100 mV, high MeHg concentration and dissolved total Hg (THg) concentration were found due to a high relative abundance of Hg-methylation bacteria (e.g., Desulfitobacterium spp.), acidification, and reductive dissolution of Fe(oxyhydr)oxides. At the E h range from 0 to +200 mV, the formation of colloids leads to adsorption of Hg and as a result colloidal Hg increased. MeHg reduction with E h (−300 to +200 mV) increase was mainly attributed to a reduced Hg methylation, as dissolved THg and relative abundance of Desulfitobacterium spp. decreased by 50 and 96%, respectively, at E h of +200 mV as compared to E h of −300 mV. Mercury demethylation might be less important since the relative abundance of demethylation bacteria (Clostridium spp.) also decreased over 93% at E h of +200 mV. These new results are crucial for predicting Hg risks in paddy fields.

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The use of calcium carbonate-enriched clay minerals and diammonium phosphate as novel immobilization agents for mercury remediation: Spectral investigations and field applications

Cited by 51 publications

References 56 publications

Characterisation of post-production raw material from the Raciszyn II deposit as a material suitable for the production of alkaline-activated materials

Characterisation of post-production raw material from the Raciszyn II deposit as a material suitable for the production of alkaline-activated materials

Nanoactivated Carbon Reduces Mercury Mobility and Uptake by Oryza sativa L: Mechanistic Investigation Using Spectroscopic and Microscopic Techniques

Mobilization, Methylation, and Demethylation of Mercury in a Paddy Soil Under Systematic Redox Changes

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