Adsorption of As(V) and P(V) by magnetic iron-based alginate-chitosan beads: Competitive adsorption and reduction mechanism of As(V) induced by Fe(II)

Sun, Siqi; Zeng, Huiping; Xu, He; Zhao, Weihua; Qi, Wei; Hao, Ruixia; Zhang, Jie; Li, Dong

doi:10.1016/j.colsurfa.2023.132068

Cited by 6 publications

(2 citation statements)

References 63 publications

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“…On the other hand, concerning the adsorption mechanism of arsenates in Fe-NPs, it is known that arsenic is typically adsorbed onto iron oxyhydroxides by creating inner and outer spherical surface complexes, either by electrostatic attraction and outer sphere complexation under acidic conditions or by ligand exchange and inner-sphere complexes, as previously reported. [57] The pH value of the aqueous solution determines the charge on the surface of the adsorbents, so the Z potential controls the adsorption process carried out by electrostatic forces. The isoelectric point value for the Ch-Fe and Ch-SD materials is 10.78, indicating that the particles have a zerosurface charge at this pH value (Figure 6).…”

Section: Composite Characterizationmentioning

confidence: 99%

Arsenate Adsorption from Aqueous Solutions Using Chitosan/Fe‐Nanoparticles Composite Microspheres

Manzo‐Valencia,

Alfaro‐Cuevas‐Villanueva,

Zárate‐Medina

et al. 2024

ChemistrySelect

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The adsorption behavior and synthesis of a chitosan microsphere composite with iron nanoparticles (Ch‐Fe) for the removal of arsenates [As(V)] from aqueous solutions were investigated. First, the chitosan microspheres (Ch‐SD) were obtained using the Spray Dryer volatilization technique (SD), optimizing their particle size. Then, the iron nanoparticles (Fe‐NPs) were prepared using the microwave precipitation technique. The composite was characterized, and the arsenate adsorption parameters were determined through batch‐type experiments. Significantly fast adsorption rates were observed for both adsorbents. Besides, Ch‐Fe and Ch‐SD effectively removed arsenates over a wide pH range. The hydroxyl and amino functional groups are involved in removing arsenates. The Pseudo‐second order and the Elovich models described arsenate kinetic sorption data for Ch‐Fe and Ch‐SD, respectively. The As(V) maximum adsorption capacities were 27.46 mg/g and 29.94 mg/g for Ch‐SD and Ch‐Fe, respectively, increasing significantly at elevated temperatures. The Langmuir‐Freundlich model adequately described the isothermal data for both materials, suggesting adsorption heterogeneity. The composite's surface impregnation with Fe‐NPs enhanced the Ch‐SD adsorption properties. The SD method was suitable for obtaining the chitosan/Fe‐NPs microspheres and effectively removed As(V) from aqueous solutions.

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Section: Composite Characterizationmentioning

confidence: 99%

Arsenate Adsorption from Aqueous Solutions Using Chitosan/Fe‐Nanoparticles Composite Microspheres

Manzo‐Valencia,

Alfaro‐Cuevas‐Villanueva,

Zárate‐Medina

et al. 2024

ChemistrySelect

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“…This suggested that different Fe(aq) species affected the adsorption of As(V) in a different manner. First, As(V) was possibly reduced by aqueous Fe(II) to As(III) while oxidizing Fe(II) to Fe(III), thereby affecting the adsorption of As(V) [22]. Second, aqueous Fe(III), under certain conditions, could form Fe (hydro) oxides and in turn control the adsorption of As(V) [23].…”

Section: Changes In Fe(aq) Concentrationmentioning

confidence: 99%

The Influence of Aqueous Iron on River Sand’s Arsenic Adsorption: Characteristics and Mechanisms

Li,

Peng,

Shan

et al. 2024

Water

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Iron-containing minerals are key factors controlling arsenic (As) transport in groundwater environments. However, few studies have observed the effect of aqueous Fe [Fe(aq)] on As behavior in a water environment. In this study, river sand in the riparian zone was collected for batch experiments to analyze the effect of Fe(aq) on the adsorption of As on river sand, utilizing characterization analyses to identify the reaction mechanism. The results showed that (1) as the concentration of Fe(aq) in the reaction system increased from 0.1 to 20 mg/L, the equilibrium adsorption capacity (Qe) of river sand for As(III) and As(V) gradually increased. For concentrations of Fe(aq) equal to or greater than 1 mg/L, the Qe for As(V) exceeds that for As(III), whereas at a Fe(aq) concentration of 0.1 mg/L, the Qe for As(III) is higher than that for As(V). (2) Compared to the reaction system without added Fe(aq), the adsorption of As(V) onto river sand was inhibited, while the adsorption of As(III) was enhanced under conditions with low concentrations (0.1, 1 mg/L) of Fe(aq). (3) At higher Fe(aq) concentrations (5, 20 mg/L), the adsorption of both As(V) and As(III) by river sand was more effective than in systems without Fe(aq). Characterization tests confirmed this, while Fe(II) reduced As(V), and Fe(aq) adhered to the surface of river sand to form Fe(OH)3 colloids, thereby facilitating the adsorption of As onto river sand.

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Remarkable adsorption of As(V) by Fe3+ and Mg2+ modified alginate porous beads (Fe/Mg-SA) via a facile method

Chen,

Song,

et al. 2024

International Journal of Biological Macromolecules

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Adsorption of As(V) and P(V) by magnetic iron-based alginate-chitosan beads: Competitive adsorption and reduction mechanism of As(V) induced by Fe(II)

Cited by 6 publications

References 63 publications

Arsenate Adsorption from Aqueous Solutions Using Chitosan/Fe‐Nanoparticles Composite Microspheres

Arsenate Adsorption from Aqueous Solutions Using Chitosan/Fe‐Nanoparticles Composite Microspheres

The Influence of Aqueous Iron on River Sand’s Arsenic Adsorption: Characteristics and Mechanisms

Remarkable adsorption of As(V) by Fe3+ and Mg2+ modified alginate porous beads (Fe/Mg-SA) via a facile method

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