Removal of arsenic from smelting wastewater using Fe3O4as anin situFe source: the effect of pre-dissolution and the evolution process of scorodite

Li, Guohua; Qi, Xianjin; Shi, Jiahao; Yan, Guizhi; Wang, Heng; Zhang, Aimin

doi:10.1039/d2ew00333c

Cited by 4 publications

(3 citation statements)

References 45 publications

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“…Similarly, peaks within the 1750–1500 cm −1 range can be attributed to the vibrational bonding of H 2 O molecules [ 40 ]. More specifically, the signals at 562 and 465 cm −1 can be attributed to the Fe-O bond [ 41 ]. The signal at 838 cm −1 corresponds to the stretching bonds of As–O–Fe [ 42 ], although this signal was relatively faint in crystals from the TR-MNBs system ( Figure 5 b).…”

Section: Resultsmentioning

confidence: 99%

Effect of Micro-Nanobubbles on Arsenic Removal by Trichoderma atroviride for Bioscorodite Generation

Morales-Mendoza,

Flores-Trujillo,

Ramírez-Castillo

et al. 2023

JoF

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The global environmental issue of arsenic (As) contamination in drinking water is a significant problem that requires attention. Therefore, the aim of this research was to address the application of a sustainable methodology for arsenic removal through mycoremediation aerated with micro-nanobubbles (MNBs), leading to bioscorodite (FeAsO4·2H2O) generation. To achieve this, the fungus Trichoderma atroviride was cultivated in a medium amended with 1 g/L of As(III) and 8.5 g/L of Fe(II) salts at 28 °C for 5 days in a tubular reactor equipped with an air MNBs diffuser (TR-MNBs). A control was performed using shaking flasks (SF) at 120 rpm. A reaction was conducted at 92 °C for 32 h for bioscorodite synthesis, followed by further characterization of crystals through Fourier–Transform Infrared Spectroscopy (FTIR), Scanning Electron Microscopy (SEM), and X-ray diffraction (XRD) analyses. At the end of the fungal growth in the TR-MNBs, the pH decreased to 2.7–3.0, and the oxidation-reduction potential (ORP) reached a value of 306 mV at 5 days. Arsenic decreased by 70%, attributed to possible adsorption through rapid complexation of oxidized As(V) with the exchangeable ferrihydrite ((Fe(III))4-5(OH,O)12), sites, and the fungal biomass. This mineral might be produced under oxidizing and acidic conditions, with a high iron concentration (As:Fe molar ratio = 0.14). The crystals produced in the reaction using the TR-MNBs culture broth and characterized by SEM, XRD, and FTIR revealed the morphology, pattern, and As-O-Fe vibration bands typical of bioscorodite and römerite (Fe(II)(Fe(III))2(SO4)4·14H2O). Arsenic reduction in SF was 30%, with slight characteristics of bioscorodite. Consequently, further research should include integrating the TR-MNBs system into a pilot plant for arsenic removal from contaminated water.

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Section: Resultsmentioning

confidence: 99%

Effect of Micro-Nanobubbles on Arsenic Removal by Trichoderma atroviride for Bioscorodite Generation

Morales-Mendoza,

Flores-Trujillo,

Ramírez-Castillo

et al. 2023

JoF

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“…It is therefore crucial to consider the oxidation state of the As agent and its mobility in water, among other factors, to control the Eh and pH in the broth culture of a biological process [12]. Scorodite (FeAsO 4 •2H 2 O) is an attractive medium for As removal due to its high stability, high As fixation capacity, good crystallization state, and low water content in slag [13]. Recent studies have focused on the production of bio-sourced scorodite (bioscorodite) using extremophile bacteria [14], where the oxidation mechanisms that control the saturation levels necessary to induce crystal formation require high temperatures.…”

Section: Introductionmentioning

confidence: 99%

Bioscorodite Production from As(III) and Fe(II) Salts under Oxidizing and Acidic Conditions of Trichoderma atroviride Culture

Ramírez-Castillo

Rodrı́guez-Vázquez

Aguilar-López

et al. 2023

Water

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Arsenic (As) contamination of groundwater is widespread and significantly affects drinking water, posing a threat to public health due to its classification as a human carcinogen. Arsenic (As) can be removed from contaminated water using sustainable technologies (e.g., biotechnological processes). The process of removing Arsenic from water through reactions with iron under acidic and oxidizing conditions in a fungal broth has been proposed alongside the production of bioscorodite (FeAsO4·2H2O) crystals by Trichoderma atroviride culture. This ascomycete was selected based on tests with three other fungi (Aspergillus niger, and the basidiomycetes, Postia placenta, and Phanerochaete chrysosporium) because it decreased the pH to 2.2, raised the redox potential (Eh) to 207 mV, and was the quickest to produce 0.39 µg/L of H2O2 in a modified Wunder medium. The Eh was further increased to 324.80 mV under improved fungal culture conditions, selected using a 23−1 fractional factorial design (FFD). The fungal broth was then used for bioscorodite production by adding Fe(III)/As(III) salts and scorodite seeds at 92 °C for 21 h. Scorodite seeds and bioscorodite were characterized by X-ray diffraction (XRD) and scanning electron microscopy (SEM). Arsenic was determined in solution by atomic absorption spectrophotometry (AAS), and a 73% reduction in the initial As concentration (0.30 g/100 mL) was observed after bioscorodite production. Bioscorodite production under appropriate fungal culture conditions could be an option for sustainable As removal from water. The production of H2O2 by the fungus resulted in the oxidation of As(III) into As(V) and acidification of the culture broth, which created the necessary conditions for the production of bioscorodite without the need for chemical acids or oxidants. This approach is environmentally friendly and cost effective, making it a promising alternative for the treatment of arsenic-contaminated water.

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“…The undissolved calcium carbonate can function as the attachment point for arsenic-bearing iron hydroxides to induce effective coagulation. 24,25 However, because the affinity between calcium carbonate and arsenic is weak, deposition is separate for most arsenic-containing iron hydroxides.…”

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confidence: 99%

Efficient arsenic coagulation by serpentine-mediated iron hydroxides

Ouyang

Song

et al. 2023

Chem. Commun.

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Removal of arsenic from smelting wastewater using Fe₃O₄as anin situFe source: the effect of pre-dissolution and the evolution process of scorodite

Abstract: Arsenic (As) pollution is a serious worldwide problem that requires urgent attention, as this heavy metal poses a serious threat to both human and environmental health. Here, Fe3O4 was used...

Cited by 4 publications

References 45 publications

Effect of Micro-Nanobubbles on Arsenic Removal by Trichoderma atroviride for Bioscorodite Generation

Effect of Micro-Nanobubbles on Arsenic Removal by Trichoderma atroviride for Bioscorodite Generation

Bioscorodite Production from As(III) and Fe(II) Salts under Oxidizing and Acidic Conditions of Trichoderma atroviride Culture

Efficient arsenic coagulation by serpentine-mediated iron hydroxides

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