This study investigates the arsenic(V) removal capacities of composite adsorbents made of silicate flakes of zirconium oxide and titanium oxide nanoparticles, which are then coated onto alumina tubes as an alternative method for arsenic(V) removal. As part of the study, the adsorption isotherms,...

Adsorption onto two-dimensional nanosheet materials offers new possibilities for fast and efficient removal of contaminants from waters. Here, the adsorption of As(V) to a new type of iron oxides - single sheet iron oxide (SSI) - has been studied as a function of time, loading and pH. Adsorption...

The complete Raman spectrum of arsenolite, cubic crystalline As4O6, is reported for the first time. The previously unseen Eg mode has been found at 443 cm−1. Further, there is additional support for the assignment of the 415 cm−1 mode as T2g.

Column experiments were conducted to experimentally simulate the initial conditions at a field site where legacy As contamination was caused by application of arsenolite as a herbicide to the soil. The experiments were designed to investigate the influence of herbicide loading and carbonate grav...

Iron diselenide (FeSe2) has been synthesized in sealed, evacuated, silica-glass tubes at temperatures between 450 and 550°C. Its powder pattern is identical with that of ferroselite described by Buryanova and Komkov (1955). The first fifteen lines of the pattern are indistinguishable from those...

The surface properties of arsenopyrite during chemical and biological oxidation were investigated by synchrotron X-ray diffraction (S-XRD), X-ray absorption near-edge structure (XANES) and scanning electron microscope (SEM), accompanying with leaching behaviors elucidation. The moderate thermoph...

It is well established that arsenopyrite can be dissolved by both oxygen and microbes under oxic conditions; however, little is known about whether it can be mobilized under anoxic conditions. Here, we isolated a dissimilatory arsenate-respiring prokaryote (DARP) strain (Citrobacter sp. A99) fro...

Arsenopyrite (FeAsS) is the most common iron sulfide mineral in the nature, and its oxidation causes arsenic (As) release and thus environmental pollution. Sunlight participates in the oxidative dissolution of sulfide minerals in supergene environments, affecting the release of toxic elements. I...

The efficient separation of chalcopyrite from arsenic-bearing minerals, especially arsenopyrite, remains a challenge in practice. In this work, a novel reagent of N-Butoxycarbonyl-O-Isobutyl Thiocarbamate (NBOIT) was employed in both single and mixed binary mineral flotation, and it proved to be...

The flotation separation efficiency of pyrite and arsenopyrite can be enhanced by low-temperature oxygen plasma pretreatment. In this study, the plasma modification mechanism on arsenopyrite and pyrite and the effect on the flotation performance of pyrite and arsenopyrite were investigated. The ...

In this study, the mechanisms by which ferric iron promotes bioleaching of arsenopyrite by the moderately thermoacidophilic strain Sulfobacillus thermosulfidooxidans YN-22 was evaluated for the first time by integrating Fe L-edge and As/S K-edge X-ray absorption near edge structure (XANES) spect...

The removal of arsenic from base-metal ores is an important environmental objective, especially in relation to mineral processing. Herein, we report an investigation into the adsorption performance of copper ions on arsenopyrite surfaces and implications for flotation using local electrochemical...

Arsenopyrite is a typical arsenic-containing mineral, and gold is generally hosted by arsenopyrite mineral which adversely affects gold leaching. In this study, a novel environmentally friendly oxidant, chlorine dioxide (ClO2), was used for the first time to efficiently oxidize arsenopyrite unde...

This paper presents the results from the investigation of arsenopyrite oxidation via mechano-chemical activation, using a stirred mill. Water and hydrogen peroxide were chosen as the lixiviant and oxidant, respectively, and maintained at a relatively low temperature (50 °C). The milling media s...

The removal of arsenic-bearing minerals from concentrates is an important environmental objective, especially in relation to metallurgical processing. In this regard, there has recently been interest in the effects of ionic species on the flotation performance of minerals in liquid phases. While...

In this research, InAs thin films were prepared by chemical spray pyrolysis method at different substrate temperatures (250 °C, 280 °C, 310 °C), with fixing the molarity of solution to 0.035 M and the deposition time to 30 min. X-ray diffraction shows that the structure of InAs films were pol...

The properties of InSb/InAs quantum dots (QDs) have been investigated by transmission electron microscopy (TEM). Specific features of diffraction contrast were discovered in plan-view TEM images of big (9–10 nm in height and 38–50 nm in diameter) InSb QDs. To understand the origin of such dist...

Gallium arsenide diodes with and without indium arsenide quantum dots were electron irradiated to investigate radiation induced defects. Baseline and quantum dot gallium arsenide pn-junction diodes were characterized by capacitance–voltage measurements, and deep level transient spectroscopy. Ca...

Three metal-rich palladium–indium and platinum–indium arsenides, Pd5InAs, Pt5InAs, and Pt8In2As, were synthesized using a high-temperature ampoule technique. Their crystal structures were determined from Rietveld analysis of powder diffraction data. All the compounds crystallize in tetragonal ...

We introduce Silicon/indium arsenide (Si/InAs) source submicron-device structure in order to minimize the impact of floating body effect on both the drain breakdown voltage and single transistor latch in ultra thin SOI MOSFETs. The potential barrier of valence band between source and body reduce...