Silane-based coatings on the pyrite for remediation of acid mine drainage

Diao, Zeng-Hui; Shi, Taihong; Wang, Shizhong; Huang, Xiongfei; Zhang, Tao; Tang, Yetao; Zhang, Xia-Ying

doi:10.1016/j.watres.2013.05.006

Cited by 82 publications

(17 citation statements)

References 46 publications

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“…The proposed mechanism shows similar pathway with Diao et al 9) whereas the formation of covalent bonds (Fe-OSi and Si-O-Si) were occur on the pyrite surface by using tetraethylorthosilicate (TEOS) and n-propyltrimethoxysilane (NPS). In Si-Cat treatment, the coating layer much more bulky than TEOS and NPS treatment.…”

Section: Effect Of Treatment Time Of Silicate Coating On Pyrite Oxidasupporting

confidence: 70%

“…The peaks observed at 103 eV and 103.8 eV are attributed to silicon dioxide and siloxanes, respectively. 9,41) From the present study, the position of the Si 2p peaks of treated pyrite samples shift from 103.5 to 103.8 eV as the silicate surface concentration increases with pH and show the formation of polymerization via siloxanes bonding. Also, the Si peak shifted to higher binding energy, which means that the binding energy of Si-O increased after treatment and also increased with pH.…”

Section: Effect Of Treatment Time Of Silicate Coating On Pyrite Oxidamentioning

confidence: 50%

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Silicate Covering Layer on Pyrite Surface in the Presence of Silicon–Catechol Complex for Acid Mine Drainage Prevention

et al. 2015

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In this paper, prevention of pyrite oxidation by carrier microencapsulation (CME) was investigated. A possible layer structure was suggested following analysis with electrochemical and surface analysis techniques. Electrochemical study of treated pyrite samples showed that treatment with siliconcatechol (Si-Cat) for 6 h at an initial pH of 9.5 gave the best barrier properties and suppression of the samples. Scanning electron microscopy with energy-dispersive X-ray, and Fourier transform infrared (FTIR) analyses confirmed the presence of a silicate layer on the surface of treated pyrite. X-ray photoelectron spectroscopy indicated that the coating layers on the treated pyrite samples consisted of a network of Fe-O-Si and Si-O-Si units bonded to the surface of pyrite. The Si-O-C asymmetric stretching mode was also observed in FTIR spectra. Detailed spectroscopic analyses confirmed the formation of a silicate polymer on a silicaquinone layer, which resulted in the effective suppression effect shown by Si-Cat-treated pyrite at increasing pH.

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Section: Effect Of Treatment Time Of Silicate Coating On Pyrite Oxidasupporting

confidence: 70%

Section: Effect Of Treatment Time Of Silicate Coating On Pyrite Oxidamentioning

confidence: 50%

Silicate Covering Layer on Pyrite Surface in the Presence of Silicon–Catechol Complex for Acid Mine Drainage Prevention

et al. 2015

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“…In general, a chemical that will chelate iron in nature will chelate iron in the human body, quite possibly in the lungs where heme molecules exchange oxygen. Triethylenetramine and diethylenetriamine (Chen et al, 2006), Fe 3+ -catecholate (Li et al, 2019), 8hydroxyquinoline (Lan et al, 2002), and n-propyltrimethoxysilane (Diao et al, 2013) show promise for chelating iron on the pyrite surface, but are not appropriate for indoor use. Sodium acetate, various phosphate-and silicon-based chemicals (Evangelou, 1998), and linoleic acid (Wang et al, 2019) offer less toxic surface treatments for pyrite.…”

Section: Interventions I -The Unaltered Pyritementioning

confidence: 99%

A review of “pyrite disease” for paleontologists, with potential focused interventions

Tacker¹

2020

Palaeontol Electron

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A literature review of the chemical reactions involved in pyrite oxidation/hydration ("pyrite disease") in geological or fossil collections gives direction to a suite of focused interventions. Reactions on the pyrite surface lie at the heart of the chemical process, accompanied by the movement of electrons on and through the pyrite semiconductor. Control of these electrons ultimately may be futile, but examination of the reactions at the atomic level leads to new possibilities for treatment, and identifies why some treatments are ineffective. This review also identifies gaps in our understanding of the oxidation and hydration reactions. Fossil biomaterials-bone or shell-often contain or are partially replaced by pyrite. Acidity produced by pyrite decay destroys these materials. Older treatments focus on acid neutralization, and humidity control as solutions for megascopic problems. Focused interventions target specific steps in the chemical reactions at the atomic scale. Interventions are informed by identification of all the minerals participating in the process, and accurate characterization of the bone, pyrite and sedimentary matrix. Bone minerals and pyrite are structurally and chemically heterogeneous, so each intervention requires bench testing, complimented by analytical measurements. Chemically passivating the unreacted pyrite surface shows the greatest promise. Anticipation of a new specimen's susceptibility to decay is key. Decay may be accelerated using techniques of humidity buffering with saturated salt solutions. Conductivity of pyrite (which varies over four orders of magnitude) may be measured. A database of pyrite conductivity is highly desirable.

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“…Reportedly, secondary iron minerals are generated during the Fe 2+ oxidation process by A. ferrooxidans, because of the facilitated subsequent Fe 3+ hydrolysis [12][13][14]18]. Figure 2 compares the time-dependent trend of the total Fe deposition efficiencies in the different treatment processes.…”

Section: Total Fe Deposition Efficiency During the Biogenic Formationmentioning

confidence: 99%

Influence of Monovalent Cations on the Efficiency of Ferrous Ion Oxidation, Total Iron Precipitation, and Adsorptive Removal of Cr(VI) and As(III) in Simulated Acid Mine Drainage with Inoculation of Acidithiobacillus ferrooxidans

Song

Wang

Yang

et al. 2018

Metals

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Acid mine drainage is highly acidic and contains large quantities of Fe and heavy metal elements. Thus, it is important to promote the transformation of Fe into secondary iron minerals that exhibit strong heavy-metal removal abilities. Using simulated acid mine drainage, this work analyzes the influence of monovalent cations (K + , NH 4 + , and Na + ) on the Fe 2+ oxidation and total Fe deposition efficiencies, as well as the phases of secondary iron minerals in an Acidithiobacillus ferrooxidans system. It also compares the Cr(VI) (K 2 Cr 2 O 7 ) and As(III) (As 2 O 3 ) removal efficiencies of different schwertmannites. The results indicated that high concentrations of monovalent cations (NH 4 + ≥ 320 mmol/L, and Na + ≥ 1600 mmol/L) inhibited the biological oxidation of Fe 2+ . Moreover, the mineralizing abilities of the three cations differed (K + > NH 4 + > Na + ), with cumulative Fe deposition efficiencies of 58.7%, 28.1%, and 18.6%, respectively [n(M) = 53.3 mmol/L, cultivation time = 96 h]. Additionally, at initial Cr(VI) and As(III) concentrations of 10 and 1 mg/L, respectively, the Cr(VI) and As(III) removal efficiencies exhibited by schwertmannites acquired by the three mineralization systems differed [n(Na) = 53.3 > n(NH 4 ) = 53.3 > n(K) = 0.8 mmol/L]. Overall, the analytical results suggested that the removal efficiency of toxic elements was mainly influenced by the apparent structure, particle size, and specific surface area of schwertmannite.

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Silane-based coatings on the pyrite for remediation of acid mine drainage

Cited by 82 publications

References 46 publications

Silicate Covering Layer on Pyrite Surface in the Presence of Silicon–Catechol Complex for Acid Mine Drainage Prevention

Silicate Covering Layer on Pyrite Surface in the Presence of Silicon–Catechol Complex for Acid Mine Drainage Prevention

A review of “pyrite disease” for paleontologists, with potential focused interventions

Influence of Monovalent Cations on the Efficiency of Ferrous Ion Oxidation, Total Iron Precipitation, and Adsorptive Removal of Cr(VI) and As(III) in Simulated Acid Mine Drainage with Inoculation of Acidithiobacillus ferrooxidans

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Silane-based coatings on the pyrite for remediation of acid mine drainage

Cited by 82 publications

References 46 publications

Silicate Covering Layer on Pyrite Surface in the Presence of Silicon&ndash;Catechol Complex for Acid Mine Drainage Prevention

Silicate Covering Layer on Pyrite Surface in the Presence of Silicon&ndash;Catechol Complex for Acid Mine Drainage Prevention

A review of “pyrite disease” for paleontologists, with potential focused interventions

Influence of Monovalent Cations on the Efficiency of Ferrous Ion Oxidation, Total Iron Precipitation, and Adsorptive Removal of Cr(VI) and As(III) in Simulated Acid Mine Drainage with Inoculation of Acidithiobacillus ferrooxidans

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Silicate Covering Layer on Pyrite Surface in the Presence of Silicon–Catechol Complex for Acid Mine Drainage Prevention

Silicate Covering Layer on Pyrite Surface in the Presence of Silicon–Catechol Complex for Acid Mine Drainage Prevention