ライフサイエンスコーパス: pyrite

1 d independent from, inorganic proxies (e.g., pyrite).

2 ther with smaller quantities of siderite and pyrite.

3 and complete sorption of monothioarsenate to pyrite.

4 line ferrihydrite, goethite, mackinawite, or pyrite.

5 be explained by abiological precipitation of pyrite.

6 dark red-to-black fragments of hematite and pyrite.

7 s and increasing the oxidative weathering of pyrite.

8 sorption experiments with local Tl-rich coal pyrite.

9 record of seawater sulfates and sedimentary pyrites.

10 ntal tellurium, or a plating of magnetite or pyrites.

11 We studied the reaction between pyrite (5-125 mM) and nitrite (40-2000 muM) at pH 0, 5.5

12 ope differences in size-sorted aerosols from pyrite ablation are not analytically resolvable.

13 In the case of pyrite acting as reductant, however, denitrification is

14 ization of transition metals, which produced pyrite and copious appended sulfur functionality.

15 opose a structure that is isostructural with pyrite and has the stoichiometry PtN2.

16 nderstanding the phase selection between the pyrite and marcasite polymorphs of FeS2.

17 ead to suggestions to improve single crystal pyrite and nanocrystalline or polycrystalline pyrite fil

18 21% of Se is present as selenide (Se(2-)) in pyrite and sphalerite, 19% of Se is present as selenite

19 ant source minerals for aqueous-phase Se are pyrite and sphalerite.

20 Mackinawite, greigite, pyrite and sulfate coexist in the sediments, indicating

21 arcasite has a band gap at least as large as pyrite and that the two polymorphs share similar absorpt

22 Fe minerals can still be present along with pyrite and vivianite, and that ferric Fe-bound P pool ca

23 here are among the largest ever observed in pyrite, and are in phase with glacial-interglacial sea l

24 cles containing pyrite, Cu and Zn-containing pyrite, and iron in hydrothermal vent black smoker emiss

25 ) for the reduction of arsenite, As(III), by pyrite are incompletely understood.

26 tructure (EXAFS) spectra of these As-bearing pyrites are explained by local structure models obtained

27 However, the performance of pyrite as an absorber material in photovoltaic devices h

28 d on the observation of natural hydrothermal pyrites, As(-I) is usually assigned to the occupation of

29 ectroscopy for As(II,III) incorporation into pyrite at octahedral Fe(II) sites and for As(-I) at tetr

30 ch reactions show that As(III) is reduced on pyrite at the Eh-pH predicted by the electrochemical stu

31 rals (chalcopyrite, chalcocite, bornite, and pyrite) at different flotation pulp conditions (feed, co

32 ord of remarkable biological preservation in pyrite back to the Paleoproterozoic and provides criteri

33 ciated with the primary minerals sphalerite, pyrite, barite, and chalcopyrite and secondary Fe oxyhyd

34 alloys are promising for the development of pyrite-based heterojunction solar cells that feature lar

35 ng minerals but is less well established for pyrite-based records.

36 two field-scale treatments from the Iberian Pyrite Belt (IPB, southwest Spain).

37 sin in the US and three sites in the Iberian Pyrite Belt in Spain and found that the fastest rates of

38 ruces is a base-metal deposit in the Iberian Pyrite Belt, one of the world's best-known ore provinces

39 seawater sulfate and reflect an increase in pyrite burial and a crash in the marine sulfate reservoi

40 s that enhanced levels of organic-carbon and pyrite burial continued a few hundred thousand years aft

41 We estimate that this organic carbon and pyrite burial event added approximately 19 x 10(18) mole

42 tion rates from the global average record of pyrite burial, highlighting how the local nature of sedi

43 r sulfur represent periods of lower rates of pyrite burial, implying a shift in the location of organ

44 ochemical box modeling of organic-carbon and pyrite burial, the sulfur-isotope excursion can be gener

45 ults with a sediment biogeochemical model of pyrite burial, we find a strong relationship between obs

46 entary sulfur isotopic composition of marine pyrite by examining a 300-m drill core of Mediterranean

47 chalcogenides and first-row transition metal pyrites catalysts.

48 We report metallic cobalt pyrite (cobalt disulfide, CoS2) as one such high-activit

49 natural magnetite, siderite, pyrrhotite, and pyrite, collected through cascade impaction, followed by

50 release occurring when sulfide (principally pyrite)-containing rock from mining activities and from

51 ogeochemical processes in a nitrate-polluted pyrite-containing aquifer and its evolution over the las

52 ure, which developed during the oxidation of pyrite-containing coal mining overburden/waste rock (OWR

53 oxidation rates coincided with maxima of the pyrite content, total cell counts, and MPN of iron(II)-o

54 n of a detailed energy band diagram for iron pyrite crystals.

55 de the formation of nanoparticles containing pyrite, Cu and Zn-containing pyrite, and iron in hydroth

56 Iron pyrite (cubic FeS2) is a promising candidate absorber ma

57 apacity of the aquifers, which is present as pyrite, degradable organic carbon, and geogenic U(IV) mi

58 nvironmental information can be derived from pyrite delta(34)S records.

59 e in the sulfur isotopic record preserved in pyrite (delta(34)Spyr) necessarily corresponds to local

60 ributions of these pools to the formation of pyrite depend on both the accumulation of the insoluble

61 On average, the amount of pyrite detached was equivalent to 6.5 x 10(-11) mol m(-2

62 e surface layer is observed, with consequent pyrite dissolution rates reduced by more than 90% at neu

63 and weathering fluxes of organic carbon and pyrite driven by either Neogene cooling or increasing Pl

64 its effectiveness as the primary oxidant of pyrite during AMD generation.

65 However, the modes of As incorporation into pyrite during its crystallization under low-temperature

66 potential for hydrogen electroadsorption on pyrite, E approximately +0.1 V (versus RHE).

67 odified [FeFe](H) cluster stably linked to a pyrite electrode immersed in acidified water.

68 The pyrite electrode readily produces hydrogen from acidifie

69 Arsenopyrite (FeAsS) and arsenian pyrite (FeAsxS2-x) of <25 mum size, which have escaped d

70 lyst containing Co doped earth abundant iron pyrite FeS(2) nanosheets hybridized with carbon nanotube

71 been used to show that the band gap of iron pyrite (FeS(2)) can be increased from ~1.0 to 1.2-1.3 eV

72 Pyrite (FeS(2)) thin films were synthesized using a H(2)

73 8% of greigite (Fe(2+)Fe(3+)(2)S(4)) and 72% pyrite (FeS(2)).

74 ous sulfur isotope (Delta(33)S) signature of pyrite (FeS2) in seafloor sediments from this period, wh

75 Iron pyrite (FeS2) is considered a promising earth-abundant s

76 Oxidation of pyrite (FeS2) plays a significant role in the redox cycl

77 al sulfate reduction that induce substantial pyrite (FeS2) precipitation.

78 g silver and gold (AgNPs and AuNPs), Fe, Mn, pyrite (FeS2), Ag2S, CuS, CdS, and ZnS, is dictated larg

79 Cu, Zn) with Na2S2 enables the formation of pyrite (FeS2), CoS2, and NiS2 at low temperatures (250-3

80 cles in suspension from mackinawite (FeS) to pyrite (FeS2).

81 yrite and nanocrystalline or polycrystalline pyrite films for successful solar applications.

82 re, large-grain, and uniform polycrystalline pyrite films that are fabricated by solution-phase depos

83 Iron pyrite (fool's gold, FeS(2)) is a promising earth abunda

84 Fe isotope fractionation accompanies abiotic pyrite formation in the absence of Fe(II) redox change.

85 artial Fe(II)(aq) utilization during abiotic pyrite formation rather than microbial dissimilatory Fe(

86 Greenstone Belt, South Africa, show that the pyrite formed by bacterial reduction of seawater sulfate

87 ol and the rate of sulfide production in the pyrite-forming environments.

88 ts revealed Se primarily correlated with the pyrite fraction with exact Se speciation highly dependen

89 he same epsilon(205)Tl value was found for a pyrite from the deposit that produced the cocombusted py

90 The gold and rounded pyrites from the conglomerates yield a rhenium-osmium is

91 strate that Se is associated with framboidal pyrite grains as a discrete, independent FeSex phase.

92 esult suggests that mechanical detachment of pyrite grains could be an important pathway for the mobi

93 al detachment, and mobilization, of embedded pyrite grains.

94 brating suspensions containing the nanosized pyrite-greigite solid phase at different pH-values and w

95 The iron isotope composition of sedimentary pyrite has been proposed as a potential proxy to trace m

96 Iron chalcogenides, in particular iron pyrite, have great potential to be useful materials for

97 Bulk pyrite in most sediments carries weak S MIF because of m

98 f the early formation of authigenic arsenian pyrite in subsurface sediments.

99 ulfur isotope data from carbonate-associated pyrite in the ~2.5-billion-year-old Batatal Formation of

100 he geochemical reactivity of such As-bearing pyrites in low-temperature subsurface environments.

101 The sulphur isotopic compositions of pyrites in the shales show strong variations along a pal

102 Pyrite is a key mineral in the global biogeochemical cyc

103 Pyrite is a ubiquitous mineral in reducing environments

104 the isotopic composition of sulphur in this pyrite is large and shows no evidence of mass-independen

105 Indeed, As-bearing pyrite is observed in a wide variety of sedimentary envi

106 eports indicated that anaerobic oxidation of pyrite is occurring, but the mechanism remains unclear.

107 We found that syngenetic pyrite is present in organic-rich shales of the 2.32-Gyr

108 h faster than Se substituted in the euhedral pyrite lattice.

109 ntial incorporation of sulfur compounds into pyrite leads to preservation of S MIF, which is predicte

110 Zn(CN)2, P6(3)/mmc, P(trans) ~ 0.9 GPa), and pyrite-like (pyr-Zn(CN)2, Pa3, P(trans) ~ 1.8 GPa).

111 and 1.8 Ga, positive iron isotope values of pyrite likely reflect an increase in the precipitation o

112 toresponse observed experimentally for mixed pyrite/marcasite-FeS2 films can be ascribed to the prese

113 network of Pa3 symmetry, as observed in the pyrite model structure, at variance with the usual, but

114 with exact Se speciation highly dependent on pyrite morphology.

115 that for these elements to become mobilized, pyrite must first dissolve.

116 be coordination assembly of anisotropic FeS2 pyrite nanoparticles (NPs) that can facilitate charge tr

117 We focused on pyrite nodules, precipitated in shallow sediments.

118 ted because arsenic acts as an inhibitor for pyrite nucleation at ambient temperature.

119 Remarkably, As(III) reduction on pyrite occurs at similar potentials to those for reducti

120 Variable and negative iron isotope values in pyrites older than about 2.3 Ga suggest that an iron-ric

121 iments of rocks from the watershed show that pyrite oxidation and carbonate dissolution control the s

122 These findings indicate that microbial pyrite oxidation and metal mobilization preferentially o

123 The mass balance of pyrite oxidation and nitrate reduction revealed a closed

124 te dissolution following proton release from pyrite oxidation and subsequent exchange by calcium for

125 Our data imply a cyclic model for pyrite oxidation by Fe(III) on the basis of the oxidatio

126 The rate of pyrite oxidation by ferric iron in sterile suspensions a

127 Inhibition of pyrite oxidation by SMP was shown to be comparable to, b

128 order of magnitude greater than the rate of pyrite oxidation expected under similar conditions.

129 Chemolithotrophic denitrification coupled to pyrite oxidation is regarded a key process in the remova

130 Maximal microcalorimetrically determined pyrite oxidation rates coincided with maxima of the pyri

131 onsidered in studies on microbially mediated pyrite oxidation with nitrate.

132 ocedure typically used to quantify microbial pyrite oxidation, in overestimating Fe(III) production.

133 Due to pyrite oxidation, metals (especially copper) are mobiliz

134 ct of phospholipid on the biogeochemistry of pyrite oxidation, which leads to acid mine drainage (AMD

135 ed organic matter can play a role in slowing pyrite oxidation.

136 equesters, on average, 37% of Se released by pyrite oxidation.

137 anaerobically oxidize a putatively nanosized pyrite particle fraction with nitrate as electron accept

138 , and temperature we found that in all cases pyrite particles became detached from the shale surfaces

139 Without silicate, oxidized pyrite particles form an overlayer of crystalline goethi

140 factors between Fe(II)(aq), mackinawite, and pyrite permit the generation of pyrite with Fe isotope s

141 The pyrite phase of Fe(1-x)CoxS(2)/CNT was characterized by

142 cause of this may be the instability of the pyrite phase.

143 rtionation and atomic rearrangement into the pyrite phase.

144 but also from formation of intermediate and pyrite phases.

145 ly controlled formation of the high-pressure pyrite polymorph of CuSe2 (by exposure to air).

146 siently increasing the marine burial rate of pyrite precipitated under euxinic (i.e., anoxic and sulf

147 On a geologic time scale, pyrite precipitation and burial governed a second feedba

148 han fossil Conotubus hemiannulatus show that pyrite precipitation was fuelled by the degradation of l

149 d sulfur pools and that the pathways forming pyrite precursors played an important role in establishi

150 s, particularly surface disulfide, to act as pyrite precursors.

151 ron and triangle combinations, MOFs based on pyrite (pyr) and rutile (rtl) nets were expected instead

152 Combined with the pyrite record, these results show that sulfate does not

153 te the full range of sedimentary delta(56)Fe(pyrite) recorded in Archean to modern sediments.

154 ess, the solar conversion efficiency of iron pyrite remains below 3%, primarily due to a low open cir

155 Sulfur isotope evidence from sedimentary pyrites reveals that the exquisite fossilization of orga

156 contents, due to cocombustion of Tl-enriched pyrite roasting waste.

157 om the deposit that produced the cocombusted pyrite roasting waste.

158 iderite (C-rich agglomerates) and pyrrhotite/pyrite (S-rich spheres).

159 al and electrochemical properties to exploit pyrite's full potential for sustainable energy applicati

160 s knowledge opens up a new tactic to address pyrite's known defect problems.

161 e investigation on {100}-faceted n-type iron pyrite single crystals to understand its puzzling low VO

162 and poor photoconversion efficiency of iron pyrite single crystals.

163 ties and solar conversion efficiency of iron pyrite single crystals.

164 ds with high HER catalytic activity, such as pyrite structure cobalt disulphide (CoS2), and substitut

165 s the same polyanionic dimer as found in the pyrite structure, which would suggest the possibility of

166 on FeS(2) surface upon Co doping in the iron pyrite structure.

167 evolution electrocatalyst material based on pyrite-structured cobalt phosphosulfide nanoparticles gr

168 and experiments to identify a highly stable, pyrite-structured iron oxide (FeO2) at 76 gigapascals an

169 s the most active HER catalyst based on iron pyrite, suggesting a scalable, low cost, and highly effi

170 ndicating that changes in the burial rate of pyrite sulfur and organic carbon did not singularly cont

171 o the burial histories of organic carbon and pyrite sulfur.

172 ncreases in the burial of organic carbon and pyrite sulphur in sediments deposited under large-scale

173 richments of molybdenum and vanadium and low pyrite sulphur isotope values (Delta(34)S values >/=65 p

174 ron (oxy)hydroxide to goethite, resulting in pyrite surface passivation.

175 A fundamental question is what role the pyrite surface plays in the reduction process.

176 ) reduction to elemental As(0) occurs on the pyrite surface under suboxic-reducing conditions and is

177 degrees C in slime streamers and attached to pyrite surfaces at a sulfide ore body, Iron Mountain, Ca

178 d be avoided if nitrite was removed from the pyrite suspensions through a washing procedure prior to

179 compositions of microscopic-sized grains of pyrite that formed about 3.4 billion years ago in the Ba

180 and experimental study to establish ternary pyrite-type cobalt phosphosulphide (CoPS) as a high-perf

181 drogen-bearing iron peroxide (FeO2Hx) in the pyrite-type crystal structure was recently found to be s

182 Neither pyrrhotite nor pyrite was found.

183 0 with a yield of 100 muM Fe(III) after 5 mM pyrite was incubated with 2000 muM nitrite for 24 h.

184 Significant oxidation of pyrite was measured at pH 0 with a yield of 100 muM Fe(I

185 No oxidation of pyrite was observed at pH 5.5 and 6.8.

186 Nanosized pyrite was readily oxidized to ferric iron and sulfate w

187 In euhedral pyrites, we found Se(-II) substitutes for S in the miner

188 uble S, total Fe and total As, implying that pyrite weathering posed a substantial stress on microbia

189 gements of crystalline intermediates to form pyrite, which is attributed to partial solvation of the

190 Pyrite, which is common in organic-rich shales, is a pot

191 sulfide-polysulfide promotes Mo fixation in pyrite while promoting formation of organo-Re adducts; t

192 quent reaction of sulfide with iron produces pyrite whose burial in sediments is an important oxygen

193 inawite, and pyrite permit the generation of pyrite with Fe isotope signatures that nearly encapsulat

194 nd gap dropped from 2.2 (hematite) to ~1 eV (pyrite), with completely converted layers exhibiting abs

195 s been proposed as a possible alternative to pyrite, yet has only been studied for interesting magnet