Adsorptive removal of mercury from acid mine drainage: a comparison of silica and maghemite nanoparticles

Mine drainage from the mining of mineral resources (coal, metals, oil sand, or industrial minerals) remains as a persistent environmental problem. This review summarizes the scientific literature published in 2014 on the technical issues related to mine drainage or mine water in active and abandoned coal/hard rock mining sites or waste spoil piles. Also included in this review is the water from oil sand operations. This review is divided into the four sections: 1) mine drainage characterization, 2) prediction and environmental impact, 3) treatment technologies, 4) oil sand water. Many papers presented in this review address more than one aspect and different sections should not be regarded as being mutuallyexclusive or all-inclusive.

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“…Active Treatment Technologies. Silica and maghemite nanoparticles (NPs) were evaluated as adsorbents to remove Hg from AMD (Etale et al, 2014).…”

Section: Cationsmentioning

confidence: 99%

Mine Drainage and Oil Sand Water

Wei

Wolfe

2015

Water Environment Research

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“…Adsorption-based approaches are attractive for a wide range of reasons including cost-effectiveness, reusability, the possibility to apply a wide range of adsorbents, and to increase their efficiency and specificity by functionalisation with appropriate moieties ( Benhamou et al, 2014 ; Dindar et al, 2015 ; Etale et al, 2020b ; Etale et al, 2015 ; Etale et al, 2014 ; Nhlane et al, 2020 ; Zou et al, 2011 ). A wide range of adsorbents including iron oxides, porous silica, and zeolites have been shown to be effective for the treatment of water contaminated by chromium ( Benhamou et al, 2013 ; Fellenz et al, 2017 ; Liu et al, 2018 ; Pour et al, 2015 ; Sannino et al, 2009 ; Smith & Ghiassi, 2006 ).…”

Section: Introductionmentioning

confidence: 99%

Synthesis and application of cationised cellulose for removal of Cr(VI) from acid mine-drainage contaminated water

Etale¹,

Nhlane²,

Mosai³

et al. 2021

AAS Open Res

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Background: Acid mine drainage (AMD) leads to contamination of surface and ground water by high levels of toxic metals including chromium. In many cases, these waters are sources of drinking water for communities, and treatment is therefore required before consumption to prevent negative health effects. Methods: Cationised hemp cellulose was prepared by etherification with two quaternary ammonium salts: 3-chloro-2-hydroxypropyl trimethyl ammonium chloride (CHPTAC) and glycidyltrimethylammonium chloride (GTMAC) and examined for (i) the efficiency of Cr(VI) removal under acid mine-drainage (AMD) conditions, and (ii) antibacterial activity. Adsorbents were characterised by electron microscopy, Fourier transform infrared (FTIR), CP-MAS 13C nuclear magnetic resonance (NMR) spectroscopy, elemental composition and surface charge. Results: FTIR and solid state 13C NMR confirmed the introduction of quaternary ammonium moieties on cellulose. 13C NMR also showed that cationisation decreased the degree of crystallisation and lateral dimensions of cellulose fibrils. Nevertheless, 47 % - 72 % of Cr(VI) ions were removed from solutions at pH 4, by 0.1 g of CHPTAC and GTMAC-cationised cellulose, respectively. Adsorption kinetics followed the pseudo-second order model and isotherms were best described by the Freundlich and Dubinin-Radushkevich models. When GTMAC-modified cellulose was applied to AMD contaminated water (pH 2.7); however, Cr(VI) removal decreased to 22% likely due to competition from Al and Fe ions. Cationised materials displayed considerable antibacterial effects, reducing the viability of Escherichia coli by up to 45 % after just 3 hours of exposure. Conclusions: Together, these results suggest that cationised cellulose can be applied in the treatment of Cr(VI)-contaminated mine water particularly if pre-treatments to reduce Fe and Al concentrations are applied.

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“…Adsorption-based approaches are attractive for a wide range of reasons including cost-effectiveness, reusability, the possibility to apply a wide range of adsorbents, and to increase their efficiency and specificity by functionalisation with appropriate moieties (Benhamou et al, 2014;Dindar et al, 2015;Etale et al, 2020Etale et al, , 2015Etale et al, , 2014Nhlane et al, 2020;Zou et al, 2011). A wide range of adsorbents including iron oxides, porous silica, and zeolites have been shown to be effective for the treatment of water contaminated by chromium (Benhamou et al, 2013;Fellenz et al, 2017;Liu et al, 2018;Pour et al, 2015;Sannino et al, 2009;Smith and Ghiassi, 2006).…”

Section: Introductionmentioning

confidence: 99%

Synthesis and Application of Cationised Cellulose for Removal of Cr(VI) from Acid Mine-Drainage Contaminated Water

Etale

Nhlane

Mosai

et al. 2020

Preprint

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Cationised hemp cellulose was prepared by etherification with two quaternary ammonium salts: 3-chloro-2-hydroxypropyl trimethyl ammonium chloride (CHPTAC) and glycidyltrimethylammonium chloride (GTMAC) and examined for (i) the efficiency of Cr(VI) removal under acid mine-drainage (AMD) conditions, and (ii) antibacterial activity. Adsorbents were characterised by electron microscopy, Fourier transform infrared (FTIR), CP-MAS 13C nuclear magnetic resonance (NMR) spectroscopy, elemental composition and surface charge. FTIR and solid state 13C NMR confirmed the introduction of quaternary ammonium moieties on cellulose. 13C NMR also showed that cationisation decreased the degree of crystallisation and lateral dimensions of cellulose fibrils. Nevertheless, 47 % - 72% of Cr(VI) ions were removed from solutions at pH 4, by 0.1 g of CHPTAC and GTMAC-cationised cellulose, respectively. Adsorption kinetics followed the pseudo-second order model and isotherms were best described by the Freundlich and Dubinin-Radushkevich models. When GTMAC-modified cellulose was applied to AMD contaminated water (pH 2.7), however, Cr(VI) uptake removal decreased to 22% likely due to competition from Al and Fe ions. Nevertheless, cationised materials displayed considerable antibacterial effects, reducing the viability of Escherichia coli by up to 45 % after just 3 hours of exposure. Together, these results suggest that cationised cellulose can be applied in the treatment of Cr(VI)-contaminated mine water particularly if pre-treatments to reduce Fe and Al concentrations are applied.

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Adsorptive removal of mercury from acid mine drainage: a comparison of silica and maghemite nanoparticles

Cited by 10 publications

References 42 publications

Mine Drainage and Oil Sand Water

Mine Drainage and Oil Sand Water

Synthesis and application of cationised cellulose for removal of Cr(VI) from acid mine-drainage contaminated water

Synthesis and Application of Cationised Cellulose for Removal of Cr(VI) from Acid Mine-Drainage Contaminated Water

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