High efficient removal of molybdenum from water by Fe2(SO4)3: Effects of pH and affecting factors in the presence of co-existing background constituents

Zhang, Xiang; Ma, Jun; Lu, Xixin; Huangfu, Xiaoliu; Zou, Jing

doi:10.1016/j.jhazmat.2015.08.026

Cited by 25 publications

(13 citation statements)

References 21 publications

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“…Mo adsorption was also dependent on the solid concentration. The results of our experiments of Mo adsorption on ferrihydrite were comparable to those obtained in previous laboratory studies. , …”

Section: Resultssupporting

confidence: 90%

“…Our laboratory adsorption experiments showed that the K d for Mo adsorption on iron oxide depends predominantly on solution pH (Figure b). A previous examination of the effects of coexisting ions on the adsorption of Mo on iron oxide showed that the presence of both Ca and SO 4 ions (the predominant cation and anion in river waters in the Erdenet area) has little effect on the adsorption of Mo under neutral to alkaline pH conditions …”

Section: Resultsmentioning

confidence: 99%

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Mo Contamination in Rivers near the Erdenet Mining Area, Mongolia: Field Evidence of High Mobility of Mo at pH >8

et al. 2021

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Although recent research points to Mo as a candidate for anthropogenically induced contamination of natural waters, there has been little research on Mo contamination in river water. The Erdenet mine in Mongolia is the one of the largest Mo mines in the world. Our systematic temporal and spatial monitoring of Mo concentrations in river waters around the Erdenet mine from March to November 2018 showed that in the Khangal River, which is downstream of the Erdenet mining area, Mo concentrations exceeded 70 μg/L (the World Health Organization health-based guideline) during summer. The sources of the Mo in river water are groundwater used for cooling in the Erdenet power plant and seepage from mine tailing ponds. Mo concentrations had a positive correlation with the pH of the river water. Laboratory adsorption experiments confirmed that the pH dependency of Mo concentrations originates from the adsorption/desorption reactions of iron oxide in the river sediments. Mo concentrations in river water were still higher 10 km downstream of the contamination sources. Our observations provided field evidence of high solubility and mobility of Mo in river water that were caused by the lower distribution coefficients of Mo adsorbed on iron oxides in water at pH >8.

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Section: Resultssupporting

confidence: 90%

Section: Resultsmentioning

confidence: 99%

Mo Contamination in Rivers near the Erdenet Mining Area, Mongolia: Field Evidence of High Mobility of Mo at pH >8

et al. 2021

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“…However, it was observed that the final solution pH altered to basic values (8.5-9.4) due to the effect of ligand exchange mechanism. It is known that at pH > 7, aqueous Fe 2+ (as dissolved FeSO4 •7H2O) can be oxidized to Fe 3+ [57] which interacts with water molecules forming hydrolysis products such as Fe(OH) 2+ , Fe(OH)2 + , Fe2(OH)2 4+ etc [59]. These products can then interact with oxoanions such as PO4 3through electrostatic adsorption, surface complexation and coprecipitation [59].…”

Section: Effect Of Coexisting Ions and Organic Mattermentioning

confidence: 99%

Removal of phosphate from aqueous solutions by adsorption onto Ca(OH) 2 treated natural clinoptilolite

Mitrogiannis

Psychoyou

Baziotis

et al. 2017

Chemical Engineering Journal

228

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Phosphorus (P) recovery from wastewater is of great interest especially when the loaded adsorbent can be used in the agriculture as slow-release fertilizer. The application depends on environmental concerns related to the chemical modification of the adsorbent and the release of toxic compounds from the loaded material to the soil or the water during adsorption. The present work focused on the phosphate (PO4-P) removal from aqueous solutions under low P concentrations (0.5-10 mg/L) by using Ca(OH)2-pretreated natural zeolite (CaT-Z). As activation agent, Ca(OH)2 presents benefits in terms of pretreatment costs and environmental impact of the applied adsorbent. The pretreatment of natural zeolite (clinoptilolite) with 0.25 mol/L Ca(OH)2 led to an increase of P removal from 1.7 to 97.6% at initial P concentration of 10 mg/L, pH 7 and 298 K. A significant reduction of the soluble reactive P was achieved with low residual concentrations of 81-238 μg P/L at 298 K rendering CaT-Z a promising sorbent for tertiary wastewater treatment. At 200 mg P/L, the adsorption capacity was 7.57 mg P/g CaT-Z. The P removal efficiency was pHindependent suggesting a beneficial use of CaT-Z under acidic and alkaline conditions. Adsorption was found to be an endothermic and slow process reaching equilibrium after 120 h, whereas the half of the PO4-P was adsorbed in the first 8 h. The applied kinetic models showed that both film and intraparticle diffusion contributed to phosphate removal. Phosphate sorption decreased in the presence of the anionic surfactant SDS, Fe 2+ , HCO3-, acetate and citrate anion. The predominant mechanisms of ligand exchange and CaP surface precipitation were confirmed by the IR-ATR and SEM-EDS analyses, respectively.

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“…In FT-IR spectra of the Mg 2 AlCO 3 -LDH (Fig. 2), the IR absorptions due to the υ 3 and υ 4 stretching vibrations of interlayer CO 3 2-ions were recorded at 1340-1370 and 1000-1020 cm -1 . This is almost what is observed for every hydroxide irrespective of the nature of the octahedral sheets suggesting a rather symmetric environment for the interlayer anions [17], [18].…”

Section: Ft-ir Analysis Of the Mg 2 Alco 3 -Ldh And Mg 2 Alc 2 O 4 -Lmentioning

confidence: 99%

“…Since heavy metals are recognized to be nonbiodegradable, it is advisable to remove them from industrial wastewater before discharge into the environment. Several methods such as ion exchange, solvent extraction, reverse osmosis, precipitation, electrochemical and adsorption processes have been proposed for the treatment of sewage contaminated with heavy metals [4][5]. However, the above mentioned methods are not economically feasible for small and medium size industries.…”

Section: Introductionmentioning

confidence: 99%

Intercalation of oxalate ions in the interlayer space of a layered double hydroxide for nickel ions adsorption

Doungmo

Kamgaing²,

Temgoua³

et al. 2016

IJBAS

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In this study, sorption properties of a synthesized anionic clay were enhanced by the intercalation of oxalate ions in its interlayer space. The pristine and modified clay materials were characterized by X-ray diffraction, Fourier transform infrared spectroscopy and thermal analysis. These techniques confirmed the presence of oxalate ions in the interlayer space of the clay. The intercalated clay was then used as a matrix for the sorption in batch mode of nickel ions in aqueous solution. The influence of a number of parameters such as contact time, pH, initial concentration of the analyte and adsorbent dosage were studied. The maximum adsorption of nickel was obtained at pH 6, that is, about 90% Ni 2+ removal. The adsorbent/adsorbate equilibrium follows a pseudo-second order kinetics and best matches the Langmuir model. The modified clay was shown to be efficient matrix for the sorption of nickel ions.

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High efficient removal of molybdenum from water by Fe2(SO4)3: Effects of pH and affecting factors in the presence of co-existing background constituents

Cited by 25 publications

References 21 publications

Mo Contamination in Rivers near the Erdenet Mining Area, Mongolia: Field Evidence of High Mobility of Mo at pH >8

Mo Contamination in Rivers near the Erdenet Mining Area, Mongolia: Field Evidence of High Mobility of Mo at pH >8

Removal of phosphate from aqueous solutions by adsorption onto Ca(OH) 2 treated natural clinoptilolite

Intercalation of oxalate ions in the interlayer space of a layered double hydroxide for nickel ions adsorption

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