Investigation of hexavalent chromium sorption in serpentine sediments

Mpouras, Thanasis; Chrysochoou, Maria; Dermatas, Dimitris

doi:10.1016/j.jconhyd.2016.12.009

Cited by 23 publications

(7 citation statements)

References 48 publications

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“…Hexavalent chromium shows two main forms, i.e., chromate (CrO 4 2− ) and dichromate (Cr 2 O 7 2− ); both forms are highly toxic in nature. 50 According to Mpouras et al 51 chromium removal might be related to two main effects: adsorption and reduction. A reduction of approximately 50% was observed at pH 5.…”

Section: Adsorption Of Metalsmentioning

confidence: 99%

Serpentinites: Mineral Structure, Properties and Technological Applications

Carmignano¹,

Vieira²,

Brandão³

et al. 2020

J. Braz. Chem. Soc.

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Serpentine is a versatile mineral family rich in Mg silicate with several polymorphic phases, mainly antigorite and lizardite, all of them with similar chemical composition (Mg 3 Si 2 O 5 (OH) 4 ). Their structures are generally composed of octahedral layers rich in Mg[MgO 2 (OH) 4 ] 6− , attached to a tetrahedral silicate [Si 2 O 5 ] 2− sheet. The unique physicochemical properties of serpentinites and the existence of large reserves in Brazil create new important opportunities for research and technological applications. In this work, serpentinites structures and properties are reviewed, as well as its occurrence and literature describing its applications in construction/ceramics, agriculture, as a silica source, in steel production, as an additive/filler in polymers, in the production of composites, adsorption of cations and organics contaminants, CO 2 capture and catalysis. The presence of harmful chrysotile associated with serpentinites, some of its properties and uses are also described.

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Section: Adsorption Of Metalsmentioning

confidence: 99%

Serpentinites: Mineral Structure, Properties and Technological Applications

Carmignano¹,

Vieira²,

Brandão³

et al. 2020

J. Braz. Chem. Soc.

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“…At present, a large amount of low-quality serpentine mining waste has not been effectively utilized. Considering that serpentine is rich in mineral elements such as magnesium ( Galey et al., 2017 ; Mpouras et al., 2017 ; Sakaguchi et al., 2018 ), it may be effective when trying to improve local saline-alkali soil by using an appropriate amount of serpentine instead of sand. In addition, the weathering of serpentine coupled with carbon fixation is also expected to increase the capture of atmospheric CO 2 ( Kojima et al., 1997 ; Liu et al., 2021 ; Lu et al., 2022 ), which may increase more soil carbon sinks while improving saline-alkali land.…”

Section: Introductionmentioning

confidence: 99%

Effect and mechanism of the improvement of coastal silt soil by application of organic fertilizer and gravel combined with Sesbania cannabina cultivation

Sun

Ren

et al. 2022

Front. Plant Sci.

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Jiangsu Province of China has a large area of coastal silt soil (CSS) with poor permeability, high salinity, and poor nutrients, which brings great difficulties to the development and utilization of coastal zones, so that needs to be improved as a matter of urgency. In this study, river-sand, serpentine, and organic fertilizer were used as additives in CSS, and Sesbania cannabina, a salt-tolerant cash crop, was planted in these differently treated soils. Through high-throughput sequencing, analysis of soil physico-chemical properties, and detection of plant growth status, the rhizosphere bacterial diversity of S. cannabina growing in CSS under different treatments and their environmental impact factors were studied, while exploring the effect and mechanism of organic fertilizer combined with gravel as a CSS modifier. The results implied that single application of organic fertilizer could significantly increase the fertility levels of total nitrogen (TN), total organic carbon (TOC) and Avail. P in CSS; then, the application of organic fertilizer with river-sand significantly reduced salt content and alkalinity of soil; meanwhile, in the treatment of single application of organic fertilizer and application of organic fertilizer combined with river-sand, the rhizosphere of S. cannabina enriched the bacterial communities of organic matter degradation and utilization to varying degrees. The soil moisture content and indicators related to saline-alkali soil (including total salt, electrical conductivity (EC), exchangeable sodium percentage (ESP), Avail. Na and Avail. K, etc.) were further reduced significantly by the application of organic fertilizer combined with river-sand and serpentine. The method has greatly improved the growth conditions of S. cannabina and promoted the positive development of its rhizosphere bacterial community. Among them, in the treatment of organic fertilizer combined with river-sand and serpentine, a variety of plant growth-promoting rhizobacteria (PGPR, such as Sphingomonas, Ensifer, and Rhodobacter) and nitrogen-cycle-related bacteria (such as nitrate-reduction-related bacteria, nitrogen-fixing bacteria like Ensifer, and purple non-sulfur photosynthetic bacteria like Rhodobacter) were enriched in the rhizosphere of S. cannabina; moreover, the mutual association and robustness of bacterial co-occurrence networks have been significantly enhanced. The results provide a theoretical basis and reference model for the improvement of coastal saline-alkali silt soil.

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“…Trivalent Cr is undoubtedly the most thermodynamically stable form of Cr in soil, as it readily precipitates as chromium hydroxide [Cr(OH) 3 ] and iron-chromium hydroxide [(Fe,Cr)(OH) 3 ] or becomes immobilised after sorption onto soil colloids (Leita et al, 2009). On the other hand, Cr(VI) is thermodynamically metastable in the pore solution and much more mobile in soil, since Cr(VI) oxyanions (chromate CrO 4 2− , hydrogen chromate HCrO 4 − , and dichromate Cr 2 O 7 2− ) are not adsorbed onto soil colloids under sub-neutral to alkaline conditions (Becquer et al, 2003;Mpouras et al, 2017). At these soil pHs, Cr(VI) can be present in the form of solid minerals in association with different cations characterised by a wide range of solubility: barium, calcium, lead and zinc chromates are the most insoluble (Kotas and Stasicka, 2000;Pettine and Capri, 2005), while alkaline and some alkaline-earth chromates are highly soluble.…”

Section: Introductionmentioning

confidence: 99%

Hexavalent chromium quantification by isotope dilution mass spectrometry in potentially contaminated soils from south Italy

et al. 2019

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Due to carcinogenicity of hexavalent chromium [Cr(VI)], its accurate quantification in Crcontaminated soils is of paramount importance. The aim of this work was to quantify Cr(VI) by species-specific IDMS in soil samples from two Italian case studies: A) farmland potentially contaminated by pseudo-total Cr and Zn and heavy hydrocarbons due to past illegal burial of tannery wastes; B) Solofrana valley where volcanic soils are potentially contaminated by pseudototal Cr and Cu due to tannery activities. Hexavalent Cr extraction from soils was performed by focused microwaves (5 min at 80 °C) using 50 mM EDTA, followed by the separation of Cr species by IC and detection by ICP-MS. The Cr(VI) extracted from 20 soil samples of case study A ranged from 0.15 to 11.18 µg g -1 , with 70 % of samples exceeding the Cr(VI) screening value set by Italian Parliament for residential/urban soil to assess their potential contamination. Higher levels of Cr(VI)

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Investigation of hexavalent chromium sorption in serpentine sediments

Cited by 23 publications

References 48 publications

Serpentinites: Mineral Structure, Properties and Technological Applications

Serpentinites: Mineral Structure, Properties and Technological Applications

Effect and mechanism of the improvement of coastal silt soil by application of organic fertilizer and gravel combined with Sesbania cannabina cultivation

Hexavalent chromium quantification by isotope dilution mass spectrometry in potentially contaminated soils from south Italy

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