Simultaneous removal of Cd(II), Co(II), Cu(II), Pb(II), and Zn(II) ions from aqueous solutions via adsorption on FAU-type zeolites prepared from coal fly ash

Joseph, Ifeoma V.; Tosheva, Lubomira; Doyle, Aidan M.

doi:10.1016/j.jece.2020.103895

Cited by 140 publications

(43 citation statements)

References 37 publications

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“…Fly ash-derived zeolites have also been used in simultaneous sorption in mixed systems (even five different heavy metals) [ 9 , 10 ]. Similar or even better sorption results were also obtained in another study, in which fly ash-derived zeolites from the faujasite group were used for heavy metals removal (Pb 2+ , Cu 2+ , Cd 2+ , Zn 2+ , Co 2+ ) in an aqueous solution [ 11 ].…”

Section: Introductionsupporting

confidence: 72%

Simultaneous Removal of Pb2+ and Zn2+ Heavy Metals Using Fly Ash Na-X Zeolite and its Carbon Na-X(C) Composite

et al. 2021

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Pure zeolite (Na-X) and a zeolite–carbon composite (Na-X(C)) were investigated as adsorbents of heavy metals—Pb2+ and Zn2+ from an aqueous solution. These materials were synthesized from fly ash—a waste from conventional hard coal combustion. Both solids were characterized using XRD, SEM-EDS, nitrogen adsorption/desorption, particle size and elemental composition analyses. The adsorption study was performed at pH 5 in the systems containing one or two adsorbates simultaneously. The obtained results showed that the pure zeolite was characterized by a more developed surface area (728 m2/g) than its carbon composite (272 m2/g), and the mean pore diameters were equal to 1.73 and 2.56 nm, respectively. The pure Na-X zeolite showed better adsorption properties towards heavy metals than its Na-X(C) composite, and Zn2+ adsorbed amounts were significantly higher than the Pb2+ ones (the highest experimental adsorption levels were: for Zn2+—656 and 600 mg/g, and for Pb2+—575 and 314 mg/g, on the Na-X and Na-X(C) surfaces, respectively). The zinc ions are exchanged with the cations inside the zeolite materials structure more effectively than lead ions with a considerably larger size. In the mixed systems, the competition between both heavy metals for access to the active sites on the adsorbent surface leads to the noticeable reduction in their adsorbed amounts. Moreover, the hydrochloric acid was a better desorbing agent for both heavy metals, especially Pb2+ one (desorption reached 78%), than sodium base (maximal desorption 25%).

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Section: Introductionsupporting

confidence: 72%

Simultaneous Removal of Pb2+ and Zn2+ Heavy Metals Using Fly Ash Na-X Zeolite and its Carbon Na-X(C) Composite

et al. 2021

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“…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: 92%

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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“…The similarity of composition between fly ash and zeolite, which is mainly SiO2-Al2O3-CaO-Fe2O3, makes it is possible to convert that ash to zeolite. Distinctive approaches have been utilized, the hydrothermal method by using an alkaline medium and with fusion pre-treatment at high temperatures for zeolite synthesis [18][19][20][21][22][23][24][25]. The distinctions concern solution/fly ash activation ratio, sort of solution, type and molarity of the alkaline agents, temperature, reaction time, pressure, and crystallization time.…”

Section: Introductionmentioning

confidence: 99%

Seawater Reinforces Synthesis of Mesoporous and Microporous Zeolites from Egyptian Fly Ash for Removal Ions of Cadmium, Iron, Nickel, and Lead from Artificially Contaminated Water

Ibrahim

ElSayed

2021

Egypt. J. Chem.

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This study focuses on the production of mesoporous and microporous zeolites via fusion pre-treating fly ash with NaOH followed by hydrothermal treatment utilizing seawater. Three pretreatments for fly ash were carried out utilizing 1:1, 1.2:1, and 1.4:1 of NaOH:fly ash ratio to compare the removal efficiency for cadmium Cd(II), iron Fe(II), nickel Ni(II), and lead Pb(II) from artificially contaminated water. The impacts of several variables including concentrations, weights, pH, and contact times were examined to acquire knowledge on the adsorption rate. X-Ray Diffraction (XRD), Scanning Electron Microscope (SEM), and Brunaauer-Emmett-Teller (BET) were utilized to investigate zeolite structures. N2 adsorption/desorption isotherms demonstrated that the synthetic zeolites were mesoporous and microporous materials with a higher specific area (347, 240, and 127 m 2 /g) than the values for raw fly ash (15m 2 /g). The X-ray diffraction outcome suggested that the synthetic products mainly belonged to phillipsite, carbonate cancrinite, and hydroxysodalite. These outcomes showed that fly ash and seawater from power plants are appropriate for synthesizing high-quality zeolites. For contaminated water treatment, the products are effective for removal Cd(II), Fe(II), Ni(II), and Pb(II) at pH 7, contact time 45 min, and dose 1 g/L. Zeolites recycling outcomes showed that the removal efficiency of investigated metal ions by Z1, Z2, and Z3 was reduced by an average of 7%, 5%, and 3% after regeneration.

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Simultaneous removal of Cd(II), Co(II), Cu(II), Pb(II), and Zn(II) ions from aqueous solutions via adsorption on FAU-type zeolites prepared from coal fly ash

Cited by 140 publications

References 37 publications

Simultaneous Removal of Pb2+ and Zn2+ Heavy Metals Using Fly Ash Na-X Zeolite and its Carbon Na-X(C) Composite

Simultaneous Removal of Pb2+ and Zn2+ Heavy Metals Using Fly Ash Na-X Zeolite and its Carbon Na-X(C) Composite

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

Seawater Reinforces Synthesis of Mesoporous and Microporous Zeolites from Egyptian Fly Ash for Removal Ions of Cadmium, Iron, Nickel, and Lead from Artificially Contaminated Water

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