Adsorption of arsenic on pre-treated zeolite at different pH levels

Mejía-Zamudio, Flérida; Valenzuela-García, Jesús L.; Gómez-Álvarez, Agustín; Meza-Figueroa, Diana; Ela, Wendell P.

doi:10.3184/095422913x13840126102755

Cited by 6 publications

(2 citation statements)

References 9 publications

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“…Although several studies report that arsenite removal decreases at highly alkaline pH [22,[64][65][66]. There are some adsorbent materials that showed an increment in the arsenite adsorption capacity as pH increases, such as fly ash [67,68], Mn-natural zeolite [34] and clinoptilolite-supported nanoscale zero-valent iron [40]. This behaviour has been associated to the presence of calcium in the adsorbent where calcium ions tend to form insoluble calcium arsenate.…”

Section: Adsorbent Efficiency As Function Of the Ph And The Presence mentioning

confidence: 99%

“…Nevertheless, the ion-exchange capacity of zeolites depends on the framework structure, ion size and shape and ionic charge and concentration of the external electrolyte solution [31]. Some natural [32][33][34][35] and synthetic zeolites [36][37][38] have been modified with iron and evaluated for arsenic adsorption, however, studies of the adsorption of As (III) by Fe-modified zeolites are scarce [39,40].In the present work, the effect of pH, temperature, concentration, adsorbent dose and ion competition on the adsorption process of As (III) on Fe-modified W zeolite was studied. Additionally, kinetic and thermodynamic studies of As (III) adsorption on this zeolite were carried out.…”

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Adsorption of Aqueous As (III) in Presence of Coexisting Ions by a Green Fe-Modified W Zeolite

Medina-Ramírez

Gamero‐Melo²,

Ruiz-Camacho

et al. 2019

Water

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The high toxicity of arsenite and the difficulty to remove it is one of the main challenges for water treatment. In the present work the surface of a low cost zeolite was modified by chemical treatment with a ferrous chloride to enhance its arsenite adsorption capacity. The effect of pH, ions coexistence, concentration, temperature and dosage was studied on the adsorption process. Additionally, the Fe-modified W zeolite was aged by an accelerated procedure and the regeneration of the exhausted zeolite was demonstrated. The Fe-modified W zeolite was stable in the pH range of 3 to 8 and no detriment to its arsenite removal capacity was observed in the presence of coexisting ions commonly found in underground water. The studies showed that the adsorption of As (III) on Fe-modified W zeolite is a feasible, spontaneous and endothermic process and it takes place by chemical bonding. The exhausting process proved the adsorption of 0.20 mg g−1 of As (III) by the Fe-modified W zeolite and this withstand at least five aging cycles without significant changes of its arsenite adsorption capacity. Fe-modified W zeolite prepared from fly ash might be a green and low-cost alternative for removal of As (III) from groundwater.

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Section: Adsorbent Efficiency As Function Of the Ph And The Presence mentioning

confidence: 99%

mentioning

confidence: 99%

Adsorption of Aqueous As (III) in Presence of Coexisting Ions by a Green Fe-Modified W Zeolite

Medina-Ramírez

Gamero‐Melo²,

Ruiz-Camacho

et al. 2019

Water

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Bio-transfer factors and temporal variation of heavy metals in different sexes of three species of edible brackish water fish

Kularatne¹,

Harris²,

Vinobaba³

et al. 2017

Environ Sci Pollut Res

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This article discusses bioaccumulation and temporal variation of heavy metals in three edible lagoon fish species with references to gender. Cd and As were undetected in the three fish species (i.e., below the method detection limits of 1 μg Cd/kg wet weight and 2 μg As/kg wet weight) irrespective of the periods, and Cd was undetected in the water too (i.e., below the detection limit of 0.0003 mg/L). Except for Zn (which was mainly available as Zn in the water), Pb was present largely as low labile metal-chloride complexes and As as HAsO as per Visual MINTEQ, version 3.1. Bio-transfer factors of Sn (which was also undetected in the water; below the detection limit of 0.05 mg/L), Hg, Pb, and Zn were <1 in both sexes, justifying that bioaccumulation was largely attributed to food rather than uptake from the water. Metal accumulation patterns differed drastically between the fish species. Arius maculatus (a carnivore) exhibited higher Zn, Hg, and Sn accumulations during the drier periods (June-September) compared with Mugil cephalus (a detritivore/herbivore) and Etroplus suratensis (an omnivore). Pb was detected only in A. maculatus (July-August) possibly due to biomagnification. Zn was present in higher levels in all species (irrespective of sex) compared with the other metals, but levels were below admissible limits. However, the relationship between temporal variation of Zn and gender in all species was insignificant. In M. cephalus, the temporal variation of Sn and Hg between the sexes was also insignificant. Female A. maculatus and E. suratensis showed higher Hg concentrations, while males showed higher Sn concentrations. Temporal variation patterns of Pb were unclear.

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MOFs for the treatment of arsenic, fluoride and iron contaminated drinking water: A review

2020

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Adsorption of arsenic on pre-treated zeolite at different pH levels

Cited by 6 publications

References 9 publications

Adsorption of Aqueous As (III) in Presence of Coexisting Ions by a Green Fe-Modified W Zeolite

Adsorption of Aqueous As (III) in Presence of Coexisting Ions by a Green Fe-Modified W Zeolite

Bio-transfer factors and temporal variation of heavy metals in different sexes of three species of edible brackish water fish

MOFs for the treatment of arsenic, fluoride and iron contaminated drinking water: A review

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