Highly efficient As(<scp>v</scp>)/Sb(<scp>v</scp>) removal by magnetic sludge composite: synthesis, characterization, equilibrium, and mechanism studies

Wang, Li; Wang, Jingmei; Zhang, Ren; Liu, Xingang; Song, Guoxin; Chen, Xiaofeng; Wang, Yi; Kong, Jilie

doi:10.1039/c6ra06208c

Cited by 33 publications

(6 citation statements)

References 46 publications

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“…The impact of PO 4 3− was particularly evident in the Zr–FeBSBC (1:20), which similarly indicates a specific sorption mechanism in this adsorbent. These results were consistent with previous studies on the Sb(V) adsorption onto Ce(III)-doped Fe 3 O 4 particles 46 , magnetic sludge particles 52 and La-doped magnetic biochars 53 . In addition, PO 4 3− may undergo inner-sphere complexation with oxy-hydroxide compounds and compete with the same sorption sites of the biochar composites.…”

Section: Resultssupporting

confidence: 93%

Antimonate sequestration from aqueous solution using zirconium, iron and zirconium-iron modified biochars

Rahman

Sanderson

et al. 2021

Sci Rep

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Antimony (Sb) is increasingly being recognized as an important contaminant due to its various industrial applications and mining operations. Environmental remediation approaches for Sb are still lacking, as is the understanding of Sb environmental chemistry. In this study, biosolid biochar (BSBC) was produced and utilized to remove antimonate (Sb(V)) from aqueous solution. Zirconium (Zr), Zirconium-iron (Zr–Fe) and Fe–O coated BSBC were synthesized for enhancing Sb(V) sorption capacities of BSBC. The combined results of specific surface area, FTIR, SEM–EDS, TEM–EDS, and XPS confirmed that Zr and/or Zr–Fe were successfully coated onto BSBC. The effects of reaction time, pH, initial Sb(V) concentration, adsorbate doses, ionic strength, temperature, and the influence of major competitive co-existing anions and cations on the adsorption of Sb(V) were investigated. The maximum sorption capacity of Zr–O, Zr–Fe, Zr–FeCl3, Fe–O, and FeCl3 coated BSBC were 66.67, 98.04, 85.47, 39.68, and 31.54 mg/g respectively under acidic conditions. The XPS results revealed redox transformation of Sb(V) species to Sb(III) occurred under oxic conditions, demonstrating the biochar’s ability to behave as an electron shuttle during sorption. The sorption study suggests that Zr–O and Zr–O–Fe coated BSBC could perform as favourable adsorbents for mitigating Sb(V) contaminated waters.

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Section: Resultssupporting

confidence: 93%

Antimonate sequestration from aqueous solution using zirconium, iron and zirconium-iron modified biochars

Rahman

Sanderson

et al. 2021

Sci Rep

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show abstract

“…The impact of PO4 3was particularly evident in the Zr-Fe (1:20) BSBC, which similarly indicates a specific sorption mechanism in this adsorbent. These results were consistent with previous studies on the Sb(V) adsorption onto Ce(III)-doped Fe3O4 particles 41 , magnetic sludge particles 47 and La-doped magnetic biochars 48 . In addition, PO4 3 indicate the surface-induced precipitation of SbO3.…”

Section: Effect Of Major Anions Major Cations and Ionic Strengthsupporting

confidence: 93%

Antimonate Sequestration from Aqueous Solution Using Zirconium, Iron and Zirconium-iron Modified Biochars

Rahman

Sanderson

et al. 2021

Preprint

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Antimony (Sb) is increasingly being recognized as an important contaminant due to its various industrial applications and mining operations. Environmental remediation approaches for Sb are still lacking, as is the understanding of Sb environmental chemistry. In this study, biosolid biochar (BSBC) was produced and utilized to remove antimonate (Sb(V)) from aqueous solution. Zirconium (Zr), Zirconium-iron (Zr-Fe) and Fe-O coated BSBC were synthesized for enhancing Sb(V) sorption capacities of BSBC. The combined results of specific surface area, FTIR, SEM-EDS, TEM-EDS, and XPS confirmed that Zr and/or Zr-Fe were successfully coated onto BSBC. The effects of reaction time, pH, initial Sb(V) concentration, adsorbate doses, ionic strength, temperature, and the influence of major competitive co-existing anions and cations on the adsorption of Sb(V) were investigated. The maximum sorption capacity of Zr-O, Zr-Fe, Zr-FeCl3, Fe-O, and FeCl3 coated BSBC were 66.67, 98.04, 85.47, 39.68, and 31.54 mg/g respectively under acidic conditions. The XPS results revealed redox transformation of Sb(V) species to Sb(III) occurred under oxic conditions, demonstrating the biochar’s ability to behave as an electron shuttle during sorption. The sorption study suggest that Zr-O and Zr-O-Fe coated BSBC could perform as favourable adsorbents for mitigating Sb(V) contaminated waters.

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“…Moreover, the unique inherent properties of biochar (such as large surface area, high porosity, active surface functional groups and favorable cation-exchange capacity) make them have possible to remediate the contaminated water and soil environments 23 , 24 . Many studies have verified that biochar or modified biochar is effective for the removal of heavy metal(loid)s (including Hg 25 , Pb 26 , Cr 27 , Cd 26 , 28 , and As 29 , 30 ), as well as eutrophication elements 31 , 32 and organic pollutants 33 , 34 . Because of the negative charge of pristine biochar 14 , and different geochemical behaviors of As and Cd ( e.g.…”

Section: Introductionmentioning

confidence: 99%

Simultaneous adsorption of As(III) and Cd(II) by ferrihydrite-modified biochar in aqueous solution and their mutual effects

Tian

Xie

Chai

et al. 2022

Sci Rep

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A simply synthetic ferrihydrite-modified biochar (Fh@BC) was applied to simultaneously remove As(III) and Cd(II) from the aqueous solution, and then to explore the mutual effects between As(III) and Cd(II) and the corresponding mechanisms. The Langmuir maximum adsorption capacities of As(III) and Cd(II) in the single adsorbate solution were 18.38 and 18.18 mg g−1, respectively. It demonstrated that Fh@BC was a potential absorbent material for simultaneous removal of As(III) and Cd(II) in aqueous solution. According to the XRF, SEM–EDS, FTIR, XRD, and XPS analysis, the mechanisms of simultaneous removal of As(III) and Cd(II) by Fh@BC could be attributable to the cation exchange, complexation with R-OH and Fe-OH, and oxidation. Moreover, the mutual effect experiment indicated that Cd(II) and As(III) adsorption on Fh@BC in the binary solution exhibited competition, facilitation and synergy, depending on their ratios and added sequences. The mechanisms of facilitation and synergy between Cd(II) and As(III) might include the electrostatic interaction and the formation of both type A or type B ternary surface complexes on the Fh@BC.

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Highly efficient As(v)/Sb(v) removal by magnetic sludge composite: synthesis, characterization, equilibrium, and mechanism studies

Abstract: Magnetic sludge with the unique flexibility, low thermal conductance and plentiful adsorption sites was fabricated for highly efficient As/Sb removal.

Cited by 33 publications

References 46 publications

Antimonate sequestration from aqueous solution using zirconium, iron and zirconium-iron modified biochars

Antimonate sequestration from aqueous solution using zirconium, iron and zirconium-iron modified biochars

Antimonate Sequestration from Aqueous Solution Using Zirconium, Iron and Zirconium-iron Modified Biochars

Simultaneous adsorption of As(III) and Cd(II) by ferrihydrite-modified biochar in aqueous solution and their mutual effects

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