Possibility of removing cadmium pollution from the environment using a newly synthesized material coal fly ash

Zhao, Hanghang; Huang, Xunrong; Zhang, Guibin; Li, Jingtian; He, Zhenli; Ji, Puhui; Zhao, Junzhe

doi:10.1007/s11356-019-07163-x

Cited by 23 publications

(14 citation statements)

References 51 publications

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“…With increasing initial metal concentrations, the binding sites on the adsorbent are gradually occupied by metal until saturation occurs [26]. Our observations are consistent with reports on Cd adsorption onto different adsorbents, e.g., pretreated rice straw and rice husk [55], chicken-manure-derived biochars [58] and coal fly ash [27]. In order to analyze the relationship between the amount of Cd adsorbed and the equilibrium Cd concentration, three adsorption isotherm models were used: the Freundlich, Langmuir and Temkin models.…”

Section: Initial CD Concentration and Adsorption Isothermssupporting

confidence: 91%

“…With the use of a pseudo-second-order model, it can be assumed that chemisorption (as precipitation and adsorption onto ash solids) was the main mechanism of Cd removal from the wastewater. The high pH of ash and the high Cd concentration in the wastewater (100 mg/L) could facilitate formation of hydroxides on the adsorbent surface [27,58,61]. In this study, the presence of calcium phosphate, hydroxyapatite and calcite in the ash, as confirmed by the XRD analysis, could be responsible for Cd precipitation.…”

Section: Contact Time and Adsorption Kineticsmentioning

confidence: 56%

“…After 40 min contact time, the amount of adsorbed Cd was 18.4 mg/g (Figure 10), which corresponded to a removal efficiency of 99%. According to other reports, with the use of high initial Cd concentrations (ranging from 50 to 200 mg/L) and other adsorbents, the equilibrium of metal adsorption was obtained at various times, e.g., 20 min with modified coal fly ash [27], 60 min with bottom ash [50] or 90 min with zeolites from coal fly ash [59]. Pseudo-first-order, pseudo-second-order and intraparticle diffusion models were fitted to the Cd sorption data to determine the major parameters governing the sorption kinetics and for insight into the mechanisms of Cd adsorption.…”

Section: Contact Time and Adsorption Kineticsmentioning

confidence: 91%

“…The ash was prepared in laboratory conditions, without detailed characterization. Most existing studies have evaluated the adsorption characteristics of heavy metals with the use of fly ash from coal combustion [24,25], chemically modified coal fly ash [26,27] and fly ash and bottom ash from wood pellet thermal power plants [28]. The type of feedstock affects the chemical composition and physical properties of fly ash and its adsorption performance [29].…”

Section: Introductionmentioning

confidence: 99%

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A Mineral By-Product from Gasification of Poultry Feathers for Removing Cd from Highly Contaminated Synthetic Wastewater

Gusiatin

Kumpienė

Janiszewska³

et al. 2020

Minerals

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Ash from poultry feather gasification was investigated as an adsorbent for Cd removal from synthetic wastewater under a range of operational conditions: initial pH (2–8) and salinity (8–38 mS/cm) of wastewater, ash dosage (2.5–50 g/L), Cd concentration (25–800 mg/L) and contact time (5–720 min). The ash was highly alkaline and had low surface area and micropores averaging 1.12 nm in diameter. Chemical/mineralogical analysis revealed a high content of P2O5 (39.9 wt %) and CaO (35.5 wt %), and the presence of calcium phosphate, hydroxyapatite and calcium. It contained only trace amounts of heavy metals, BTEX, PAHs and PCBs, making it a safe mineral by-product. Cd adsorption was described best with Langmuir and pseudo-second order models. At pH 5, an ash dosage of 5 g/L, 40 min contact time and 100 mg Cd/L, 99% of Cd was removed from wastewater. The salinity did not affect Cd sorption. The maximum adsorption capacity of Cd was very high (126.6 mg/g). Surface precipitation was the main mechanism of Cd removal, possibly accompanied by ion exchange between Cd and Ca, coprecipitation of Cd with Ca-mineral components and Cd complexation with phosphate surface sites. Poultry ash effectively removes high concentrations of toxic Cd from wastewater.

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Section: Initial CD Concentration and Adsorption Isothermssupporting

confidence: 91%

Section: Contact Time and Adsorption Kineticsmentioning

confidence: 56%

Section: Contact Time and Adsorption Kineticsmentioning

confidence: 91%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

A Mineral By-Product from Gasification of Poultry Feathers for Removing Cd from Highly Contaminated Synthetic Wastewater

Gusiatin

Kumpienė

Janiszewska³

et al. 2020

Minerals

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“…The new materials obtained by modification have been continuously investigated in recent decades regarding the treatment of wastewater [8,17,20,[25][26][27][28]. The literature presents different adsorbents based on modified fly ash for cadmium adsorption [25].…”

Section: Introductionmentioning

confidence: 99%

Eco-Friendly Materials Obtained by Fly Ash Sulphuric Activation for Cadmium Ions Removal

et al. 2020

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Wastes are the sustainable sources of raw materials for the synthesis of new adsorbent materials. This study has as objectives the advanced capitalization of fly ash, by sulphuric acid activation methods, and testing of synthesized materials for heavy metals removal. Based on the previous studies, the synthesis parameters were 1/3 s/L ratio, 80 °C temperature and 10% diluted sulphuric acid, which permitted the synthesis of an eco-friendly adsorbent. The prepared adsorbent was characterized through SEM, EDX, FTIR, XRD and BET methods. Adsorption studies were carried out for the removal of Cd2+ ions, recognized as ions dangerous for the environment. The effects of adsorbent dose, contact time and metal ion concentrations were studied. The data were tested in terms of Langmuir and Freundlich isotherm and it was found that the Langmuir isotherm fitted the adsorption with a maximum adsorption capacity of 28.09 mg/g. Kinetic data were evaluated with the pseudo-first-order model, the pseudo-second-order model and the intraparticle diffusion model. The kinetics of cadmium adsorption into eco-friendly material was described with the pseudo-second-order model, which indicated the chemisorption mechanism.

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Characterization of coal gangue and coal gangue-based sodalite and their adsorption properties for Cd2+ ion and methylene blue from aqueous solution

Wang

Feng

Wang

et al. 2023

J Mater Cycles Waste Manag

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Possibility of removing cadmium pollution from the environment using a newly synthesized material coal fly ash

Cited by 23 publications

References 51 publications

A Mineral By-Product from Gasification of Poultry Feathers for Removing Cd from Highly Contaminated Synthetic Wastewater

A Mineral By-Product from Gasification of Poultry Feathers for Removing Cd from Highly Contaminated Synthetic Wastewater

Eco-Friendly Materials Obtained by Fly Ash Sulphuric Activation for Cadmium Ions Removal

Characterization of coal gangue and coal gangue-based sodalite and their adsorption properties for Cd2+ ion and methylene blue from aqueous solution

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