Dual role of coal fly ash in copper ion adsorption followed by thermal stabilization in a spinel solid solution

Wu, Pengfei; Tang, Yuanyuan; Cai, Zongwei

doi:10.1039/c7ra11495h

Cited by 9 publications

(2 citation statements)

References 42 publications

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“…Furthermore, the larger amount of spectral features in the EUFA XRD spectrum shown in Figure 1 indicates a much more complex mineralogy, including compounds such as ZnO and copper species such as CuO, Cu 2 O, and Cu 2 S. These species are commonly present in FA samples but in different proportions depending on its source region and the combustion process. 55,56 The presence of copper(I), as for iron(II), in EUFA is mostly the result of an incomplete combustion process characteristic of this sample. Furthermore, copper AAS analysis of all FA samples showed that EUFA contains (720 ± 10) μg g −1 of Cu, about 5 times more than USFA and 36 times more than INFA.…”

Section: ■ Results and Discussionmentioning

confidence: 93%

Atmospheric Processing of Anthropogenic Combustion Particles: Effects of Acid Media and Solar Flux on the Iron Mobility from Fly Ash

Kim

Xiao

Karchere-Sun

et al. 2020

ACS Earth Space Chem.

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Atmospheric combustion particles, such as fly ash emitted from coal-fired power plants, are a potential source of atmospheric iron, with significant implications in climate and global biogeochemical cycles. While the iron content and speciation of fly ash depend closely on the source region and combustion process, few studies have been carried out comparing the atmospheric processing of fly ash produced from coal-fired power plants in different regions. In this study, we present an investigation of iron dissolution in acidic aqueous solutions: HNO 3 and HCl at pH 1 and pH 2 under daytime and nighttime conditions for three fly ash samples from three different sources: United States (USFA), Central Europe (EUFA), and India fly ash (INFA). Iron mobility and speciation depend on the source region and the combustion efficiency that generates fly ash. In HCl suspensions, proton-promoted mechanisms lead to larger fractions of aqueous-phase iron leached from fly ash particles, with poorly combusted samples providing significant fractions of Fe 2+ . In HNO 3 suspensions, a surface-mediated redox reaction suppresses the mobility of Fe 2+ , leading to the formation of nitrites. In the presence of solar radiation, previously unrecognized pathways of atmospheric processing enhance the formation Fe 2+ and nitrous acid from combustion particles. The information provided herein could be significant to increase our understanding of the effects of combustion particles in the atmospheric chemical balance regarding iron and nitrites.

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Section: ■ Results and Discussionmentioning

confidence: 93%

Atmospheric Processing of Anthropogenic Combustion Particles: Effects of Acid Media and Solar Flux on the Iron Mobility from Fly Ash

Kim

Xiao

Karchere-Sun

et al. 2020

ACS Earth Space Chem.

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“…According to the presented data, the FA exhibits adsorption capacity for Cu(II) ions equal to 27.32-58.48 mg/g [25]. Wu et al presented the maximum adsorption capacity for Cu(II) at the level of 48.8 mg/g [26]. Kumar et al analyzed the possibility of removal of Cd(II), Ni(II), Cu(II) in aqueous systems.…”

Section: Introductionmentioning

confidence: 98%

High Efficiency of the Removal Process of Pb(II) and Cu(II) Ions with the Use of Fly Ash from Incineration of Sunflower and Wood Waste Using the CFBC Technology

2021

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In these research studies, fly ash (SW-FA) resulting from the incineration of sunflower (20%) and wood (80%) waste employing the circulating fluidized bed combustion (CFBC) technology was used to analyze the possibility of removing Pb(II) and Cu(II) ions in adsorption processes. Currently, great emphasis is placed on circular economy, zero waste or climate neutrality strategies. The use of low-cost SW-FA waste seems to fit well with pro-ecological, economic and energy-saving trends. Hence, this material was characterized by various techniques, such as granulation analysis, bulk density, SEM-EDX, XRD and XRF analysis, BET, BJH, thermogravimetry, zeta potential, SEM morphology and FT-IR spectrometry. As a result of the conducted research, the factors influencing the effectiveness of the adsorption process, such as adsorbent dosage, initial and equilibrium pH, initial metal concentration and contact time, were analyzed. The maximum removal efficiency were achieved at the level of 99.8% for Pb(II) and 99.6% for Cu(II), respectively. The kinetics analysis and isotherms showed that the pseudo-second-order equation and the Freundlich isotherm models better describe these processes. The experiments proved that SW-FA can act as an appropriate adsorbent for highly effective removal of lead and copper from wastewater and improvement of water quality.

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Adsorption Characteristic of Cr(VI) onto Different Activated Coal Fly Ashes: Kinetics, Thermodynamic, Application Feasibility, and Error Analysis

Wang

Han

2019

Water Air Soil Pollut

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Dual role of coal fly ash in copper ion adsorption followed by thermal stabilization in a spinel solid solution

Abstract: Coal fly ash is usually used as a cost-effective adsorbent for heavy metal removal, accumulating large amounts of spent coal fly ash that requires further disposal.

Cited by 9 publications

References 42 publications

Atmospheric Processing of Anthropogenic Combustion Particles: Effects of Acid Media and Solar Flux on the Iron Mobility from Fly Ash

Atmospheric Processing of Anthropogenic Combustion Particles: Effects of Acid Media and Solar Flux on the Iron Mobility from Fly Ash

High Efficiency of the Removal Process of Pb(II) and Cu(II) Ions with the Use of Fly Ash from Incineration of Sunflower and Wood Waste Using the CFBC Technology

Adsorption Characteristic of Cr(VI) onto Different Activated Coal Fly Ashes: Kinetics, Thermodynamic, Application Feasibility, and Error Analysis

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