2019年11月15日 · In the present study we attempted to experimentally determine the thermodynamic and kinetic parameters needed to compute solubility and dissolution rate of scorodite at 25 °C. Experiments were carried out in low pH (1.15) solutions using specially synthesized large scorodite crystals (with Mean Diameter of 27.9 μm).

2023年8月1日 · Owing to the chemical stability of scorodite, the synthesis of scorodite for arsenic fixation has gained interest as a treatment method for arsenic-containing wastewater generated at nonferrous metal smelting plants and other facilities. Diverse synthesis processes have been investigated such as hydrothermal, oxidation, and solid iron oxide ...

A SEM picture of scorodite deposited on gypsum is shown in Figure 6. Cations such as copper, nickel or zinc, which may be present in industrial solutions, do not interfere with the...

In this study, we propose a growth pathway of scorodite in an atmospheric scorodite synthesis. Scorodite is a non-direct product, which is derived from the transformation of its precursor.

2019年2月13日 · The morphology and elemental composition were analyzed using a scanning electron microscope (SEM) and energy dispersive spectrometer (EDS), respectively. Raman spectroscopy and attenuated total reflectance Fourier-transform infrared spectroscopy (ATR-FTIR) were employed for characterization of encapsulated scorodite (E-scor).

Fig. 9—X-ray diffractograms of externally added gypsum seed, scorodite precipitated on externally added pure gypsum seed, and chloride-elutriated mixed scorodite/gypsum product. The last pattern at the bottom is of pure scorodite precipitate produced at 95 °C with 20 g/L hydrothermal seed.

2024年11月1日 · The improved flowsheet of scorodite synthesis (a), the XRD pattern comparison (b), SEM images of scorodite synthesized from pressurized oxidation (c), and atmospheric oxidation (d).

2019年8月16日 · Scorodite (iron arsenate) is recognized as the best solid arsenic material in the world. It has the advantages of high arsenic content, good stability, and a low iron/arsenic molar ratio. However, scorodite can decompose and release arsenic in a …

2015年6月12日 · Figure 7 shows the SEM images of the precipitated samples synthesized using procedures (1)–(3) and using 200 kHz ultrasound irradiation. Majority of the particle size of scorodite obtained by procedures (1)–(3) were 3–8 µm. However, procedure (1) contained a considerable amount of fine particles (approximately 1 µm).

Stabilization of arsenic by precipitation of large crystalline scorodite (FeAsO 4 ·2H 2 O) particles is considered to be a promising option for treating As(V) contained in industrial by-products. In this study, scorodite synthesis by direct addition of hematite particles as a Fe(III) source to Fe(II) solution containing As(V) was investigated ...