Abstract:Recebido em 21/3/07; aceito em 17/12/07; publicado na web em 31/7/08 ADSORPTION OF ARSENIC(V) BY CROSSLINKED IRON-III-CHITOSAN. The removal of As(V) by a crosslinked iron(III)-chitosan adsorbent was evaluated under various conditions. The adsorption capacity of CH-FeCL was around 54 mg/g of As(V). The kinetics of adsorption obeys a pseudo-first-order model with rate constants equal to 0.022, 0.028, and 0.033 min -1 at 15, 25 and 35 o C respectively. Adsorption data were well described by the Langmuir model, al… Show more
“…An alternative to the use of iron salts could be the adsorption to organic compounds as proposed by Fagundes et al (2008), who used a complex of iron-chitosan (III) for the removal of arsenate from surface waters, besides many other low-cost adsorbents as dry plants, red mud, fl y ash and zeolites (Chiban et al 2012). Furthermore considering the chitin constitution of cladocerans carapace, the toxicity of arsenic may be enhanced by adsorption of this ametal to exoskeleton of test organisms, and iron could increase this adsorption, although some authors associate the metal adsorption to limestone from carapace (Tsui and Wang 2007).…”
Arsenic is an ametal ubiquitous in nature and known by its high toxicity. Many studies have tried to elucidate the arsenic metabolism in the cell and its impact to plants, animals and human health. In aqueous phase, inorganic arsenic is more common and its oxidation state (As III and As V) depends on physical and chemical environmental conditions. The aim of this study was to evaluate toxicity of arsenic to Daphnia similis and Ceriodaphnia silvestrii, isolated and associated with iron. The results showed differences in toxicity of As III and As V to both species. Effective concentration (EC50) mean values were 0.45 mg L -1 (As III) and 0.54 mg L -1 (As V) for D. similis, and 0.44 mg L -1 (As III) and 0.69 mg L -1 (As V) for C. ), showing synergistic effect of these substances.
“…An alternative to the use of iron salts could be the adsorption to organic compounds as proposed by Fagundes et al (2008), who used a complex of iron-chitosan (III) for the removal of arsenate from surface waters, besides many other low-cost adsorbents as dry plants, red mud, fl y ash and zeolites (Chiban et al 2012). Furthermore considering the chitin constitution of cladocerans carapace, the toxicity of arsenic may be enhanced by adsorption of this ametal to exoskeleton of test organisms, and iron could increase this adsorption, although some authors associate the metal adsorption to limestone from carapace (Tsui and Wang 2007).…”
Arsenic is an ametal ubiquitous in nature and known by its high toxicity. Many studies have tried to elucidate the arsenic metabolism in the cell and its impact to plants, animals and human health. In aqueous phase, inorganic arsenic is more common and its oxidation state (As III and As V) depends on physical and chemical environmental conditions. The aim of this study was to evaluate toxicity of arsenic to Daphnia similis and Ceriodaphnia silvestrii, isolated and associated with iron. The results showed differences in toxicity of As III and As V to both species. Effective concentration (EC50) mean values were 0.45 mg L -1 (As III) and 0.54 mg L -1 (As V) for D. similis, and 0.44 mg L -1 (As III) and 0.69 mg L -1 (As V) for C. ), showing synergistic effect of these substances.
“…Various reports have already been published involving Fecrosslinked chitosan complex (Ch-Fe) as adsorbent of oxianions, such as phosphate [22], arsenate [23] and chromium (VI) [24] and the results have demonstrate that Ch-Fe could be a stronger adsorbent of oxianions.…”
“…Others combine iron with chitosan in all kinds of forms, and the sorption is close to the pH under the certain condition (Fagundes et al 2008;Vu et al 2013;Gupta et al 2013;Cho et al 2012;Hanh et al 2015;Wang et al 2014a, b). For As(V), the best sorption is between 2 and 5, and the sorption will decrease due to the positive or negative charging on the surface of adsorbent and adsorbate at high pH.…”
As arsenic removal becomes a global concern, the development of removal processes for arsenic treatment is still a major challenge. With regard to environmental compatibility and cheapness, chitosan and chitosan derivatives are considered as a promising removal technology for arsenic. Chitosan and chitosan derivatives possess the properties of low cost and good sorption on the arsenic removal. The present review is concerned about the present understanding of the mechanisms involved in sorption processes. Further on, detailed discussions are given of the effects of various factors on the performance of chitosan and chitosan derivatives in arsenic treatment processes. Finally, special attention is paid to the future challenges of chitosan and chitosan derivatives utilized for industrial arsenic treatment.
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