Graphene-supported nanoscale zero-valent iron: Removal of phosphorus from aqueous solution and mechanistic study

Liu, Fenglin; Yang, Jinghe; Zuo, Jiane; Ma, Ding; Gan, Liu Shi; Xie, Bin; Wang, Pei; Yang, Bo

doi:10.1016/j.jes.2014.06.016

Cited by 120 publications

(40 citation statements)

References 47 publications

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“…The mechanisms of phosphorus adsorption by an alumina adsorbent have been investigated in previous studies [34][35][36], which could explain that the exchange of hydroxyl group on the surface of aluminum (Al-OH) with phosphorus and formation of phosphorus complex (Al-P) were the main process for phosphorus removal. The process of phosphorus adsorption can be described as hydroxylation that happened on the surface of the alumina in solution, then the hydroxyl group was activated for the positively charged surface; finally, electrostatic adsorption and phosphorus complex formation arose competitively.…”

Section: Adsorption Mechanismmentioning

confidence: 99%

Removal of Phosphorus from Wastewater by Different Morphological Alumina

et al. 2020

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In this work, an organic-free method was used to synthesize different morphological boehmite by controlling the crystallization temperature, and alumina adsorbents were obtained by baking the boehmites at 500 °C. The alumina adsorbents were characterized by X-ray diffraction (XRD), High resolution transmission electron microscope (HRTEM), Fourier transform infrared (FT-IR), N2 adsorption/desorption analysis, and their phosphorus adsorption properties were comparatively investigated by a series of experiments. The results showed that the self-prepared alumina adsorbents were lamellar and fibrous material, while the industrial adsorbent was a granular material. The lamellar alumina adsorbents had the largest specific surface area and showed better phosphorus adsorption capacity. The maximum adsorption capacity could reach up to 588.2 mg·g−1; and only 0.8 g·L−1 of lamellar alumina adsorbent is needed to treat 100 mg·L−1 phosphorus solution under the Chinese level 1 discharge standard (0.5 mg·L−1). Further investigation suggests that the lamellar alumina adsorbent kept high adsorption capacity in various solution environments.

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Section: Adsorption Mechanismmentioning

confidence: 99%

Removal of Phosphorus from Wastewater by Different Morphological Alumina

et al. 2020

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“…Bare iron nanoparticles lack durability and their mechanical strength is also weak. To overcome these shortcomings, technologies have been developed using some materials as mechanical supports to enhance the dispersion of nZVI particles [16]. Many studies have been carried out on the use of porous materials to support nZVI, for example, nZVI particles supported on resin, were used to remove Pb(II) ions in aqueous solution, and the results showed that the reaction rates for Pb(II) ions were up to 30 times higher than that using iron fillings or powder [17].…”

Section: Introductionmentioning

confidence: 99%

Synthesis and Characterization of Reduced Graphene Oxide-Supported Nanoscale Zero-Valent Iron (nZVI/rGO) Composites Used for Pb(II) Removal

Fan

et al. 2016

Materials

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Reduced graphene oxide-supported nanoscale zero-valent iron (nZVI/rGO) composites were prepared by chemical deposition method and were characterized by scanning electron microscopy (SEM), X-ray diffraction (XRD), Raman spectroscopy, N2-sorption and X-ray photoelectron spectroscopy (XPS). Operating parameters for the removal process of Pb(II) ions, such as temperature (20–40 °C), pH (3–5), initial concentration (400–600 mg/L) and contact time (20–60 min), were optimized using a quadratic model. The coefficient of determination (R2 > 0.99) obtained for the mathematical model indicates a high correlation between the experimental and predicted values. The optimal temperature, pH, initial concentration and contact time for Pb(II) ions removal in the present experiment were 21.30 °C, 5.00, 400.00 mg/L and 60.00 min, respectively. In addition, the Pb(II) removal by nZVI/rGO composites was quantitatively evaluated by using adsorption isotherms, such as Langmuir and Freundlich isotherm models, of which Langmuir isotherm gave a better correlation, and the calculated maximum adsorption capacity was 910 mg/g. The removal process of Pb(II) ions could be completed within 50 min, which was well described by the pseudo-second order kinetic model. Therefore, the nZVI/rGO composites are suitable as efficient materials for the advanced treatment of Pb(II)-containing wastewater.

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“…Phosphorus and starch reportedly are the main wastewater contaminants that are difficult to remove efficiently [63][64]. When the phosphorus concentration in water exceeds 0.02 mg/L, phosphorus becomes a polluting element and causes eutrophication of water bodies [65][66][67]. Starch is a commonly used and cheap material, widely used in many chemical and material industries, but it produces high concentration of organic wastewater, which will affect the environment [68][69][70].…”

Section: Removal Of Phosphate and Starch In Wastewatermentioning

confidence: 99%

Magnetic Separation of Impurities from Hydrometallurgy Solutions and Waste Water Using Magnetic Iron Ore Seeding

Han¹,

Sun²,

Sun³

et al. 2021

Iron Ores

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The removal of iron ion from leaching solution is critical for the recovery of value metals, with the method of choice commonly being crystallization (precipitation). This paper summarized the new improvements in iron removal by precipitation methods in recent years and proposed a novel process, magnetic seeding and separation. The new process can promote iron precipitate aggregation and growth on the surface of the magnetic iron ore seeds. A core-shell structure was formed of iron precipitate and magnetic iron ore seeds, which can be magnetized and coalesced in magnetic field, accelerating the solid-liquid separation. The efficient magnetic flocculation and separation offset the poor settleability and filterability of the residues, contributing to the development of the hydrometallurgy process. Moreover, magnetic seeding and separation was also used for the removal of organic and inorganic contaminants from wastewater, significantly improving the purification efficiency. Therefore, iron ore not only played an important role in mining and steel manufacture, but also can be used to solve some problems in crossing fields.

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Graphene-supported nanoscale zero-valent iron: Removal of phosphorus from aqueous solution and mechanistic study

Cited by 120 publications

References 47 publications

Removal of Phosphorus from Wastewater by Different Morphological Alumina

Removal of Phosphorus from Wastewater by Different Morphological Alumina

Synthesis and Characterization of Reduced Graphene Oxide-Supported Nanoscale Zero-Valent Iron (nZVI/rGO) Composites Used for Pb(II) Removal

Magnetic Separation of Impurities from Hydrometallurgy Solutions and Waste Water Using Magnetic Iron Ore Seeding

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