Topic
Hematite
About: Hematite is a research topic. Over the lifetime, 7922 publications have been published within this topic receiving 219272 citations. The topic is also known as: blood stone & oligiste.
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TL;DR: The concentration of arsenic in natural iron oxyhydroxides and oxide minerals extracted from soils at the Ashanti mine, Ghana, and was found to vary from 2 to 35,600 mg/kg as discussed by the authors.
580 citations
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TL;DR: In this article, a hematite photoanode showing a stable, record-breaking performance of 4.32 µmW/cm2 photoelectrochemical water oxidation current at 1.23 µmV vs. RHE under simulated 1-sun irradiation was reported.
Abstract: A hematite photoanode showing a stable, record-breaking performance of 4.32 mA/cm2 photoelectrochemical water oxidation current at 1.23 V vs. RHE under simulated 1-sun (100 mW/cm2) irradiation is reported. This photocurrent corresponds to ca. 34% of the maximum theoretical limit expected for hematite with a band gap of 2.1 V. The photoanode produced stoichiometric hydrogen and oxygen gases in amounts close to the expected values from the photocurrent. The hematitle has a unique single-crystalline “wormlike” morphology produced by in-situ two-step annealing at 550°C and 800°C of β-FeOOH nanorods grown directly on a transparent conducting oxide glass via an all-solution method. In addition, it is modified by platinum doping to improve the charge transfer characteristics of hematite and an oxygen-evolving co-catalyst on the surface.
573 citations
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TL;DR: The main trend observed in the variation of the arsenic sorbed with pH is the decrease of the sorption on the three sorbents at alkaline pH values, which agrees with results found in the literature.
561 citations
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TL;DR: In this article, the reaction between dissolved sulfide and synthetic iron (oxyhydr)oxide minerals was studied in artificial seawater and 0.1 M NaCl at pH 7.5 and 25°C.
550 citations
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545 citations