Electrochemical reduction of Cr(VI) in the presence of sodium alginate and its application in water purification

Butter, Bryan; Santander, Paola; Pizarro, Guadalupe del C.; Oyarzún, Diego P.; Tasca, Federico; Sánchez, Julio

doi:10.1016/j.jes.2020.08.033

Cited by 39 publications

(10 citation statements)

References 45 publications

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“…Therefore, in a previous investigation, we investigated the electrochemical reduction of Cr(VI) to Cr(III) in the presence of SA and the subsequent removal of the produced Cr(III)-SA by PEUF. 47 The results demonstrated that SA is an effective WSP for the elimination of contaminating species through PEUF with a metal ion adsorption efficiency of 100%. It is posited that the adsorption efficiency is strongly influenced by the structural functional groups of SA that capture cationic species, namely, COO − and OH − , for removal from the solution according to studies of PEUF with assistance from SA for the retention of metals such as Fe(III) 48 and of AA as a WSP for the retention of Cu(II), Fe(III), 49 Ag(II), Co(II), Ni(II), Cu(II), Zn(II), Cd(II), and Pb(II).…”

Section: Introductionmentioning

confidence: 92%

Use of sodium alginate biopolymer as an extracting agent of methylene blue in the polymer‐enhanced ultrafiltration technique

Oyarce

Santander

Butter

et al. 2021

J of Applied Polymer Sci

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In this study, the removal of methylene blue (MB) cationic dye from an aqueous solution was investigated using the polymer-enhanced ultrafiltration (PEUF) technique with sodium alginate (SA) as an extracting soluble polymer, in combination with an ultrafiltration membrane of regenerated cellulose with a 10 kDa molar mass cut-off. SA was characterized via Fourier-transform infrared spectroscopy and thermogravimetric analysis. For ultrafiltration studies, the washing method was used to evaluate various experimental variables, such as the pH, SA dose and initial MB concentration, and adsorption isotherms to identify the optimal adsorption conditions. Finally, the regeneration of the SA polymer was evaluated in five consecutive cycles of adsorption-desorption of MB. In the obtained characterization results, the structural composition of SA and the characteristic thermal stability of the polymer were verified. The PEUF results demonstrated that a retention capacity of 98% of the MB was realized at pH 8.0 using 0.025 g of SA at an initial optimal MB concentration of 50 mg L −1 . It is possible to observe that the Freundlich model better explain the interaction between the dye and the polymer surface. According to the results is demonstrated the regeneration capacity of the polymer and its subsequent reuse.

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Section: Introductionmentioning

confidence: 92%

Use of sodium alginate biopolymer as an extracting agent of methylene blue in the polymer‐enhanced ultrafiltration technique

Oyarce

Santander

Butter

et al. 2021

J of Applied Polymer Sci

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“…3,4 In addition to geological reasons, chromium also enters drinking water resources through pollution from multiple industries (e.g., chrome plating, leather tanning etc.). 5 In aqueous solutions, chromium is present in the neutral pH range as trivalent (Cr(III)) or hexavalent form (Cr(VI)). 6 While Cr(III) compounds in small amounts are essential for metabolic processes in the human body, Cr(VI) compounds are highly problematic as they are carcinogenic.…”

Section: Introductionmentioning

confidence: 99%

“…18 However, these technologies are complex to operate and expensive due to high operation costs. 5 For these reasons, the removal of chromium from drinking water sources is still a problem today in many regions of the world.…”

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confidence: 99%

Adsorptive dead-end filtration for removal of Cr(vi) using novel amine modified polyacrylonitrile ultrafiltration membranes

Mantel

Glass

Usman

et al. 2022

Environ. Sci.: Water Res. Technol.

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“…For example, the comprehensive sewage discharge standard GB 8978 − 1996 stipulates that the maximum acceptable emission concentration of Cu 2+ is 0.5 mg/L. The treatment methods for heavy metals in wastewater include: chemical method [6], adsorption [7,8], electro-dialysis [9,10], ion exchange method [7,11], photocatalysis methods [12,13], and etc. With the adsorption method's advantages such as economic, simple and easy to operate, and wide scope of application, the research and development of green adsorption materials with good performance and speci c selectivity is becoming an important trend of controlling heavy metal pollution and recycling of resources [14][15][16][17].…”

Section: Introductionmentioning

confidence: 99%

Ion Imprinted Sodium Alginate Hydrogel Beads Enhanced with Carboxymethyl Cellulose and β-Cyclodextrin to Improve Adsorption for Cu2+

et al. 2022

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Using Cu 2+ as template ion, three sodium alginate hydrogel beads including SA, SAC, and SAB beads were prepared with sodium alginate blending with different precursors of carboxymethyl cellulose and βcyclodextrin, respectively. The effect of pH, adsorption time, initial concentration of Cu 2+ , adsorbent dosage, and coexisting ions on the adsorption e ciency of three hydrogel beads was investigated. The results indicated that adding carboxymethyl cellulose and β-cyclodextrin into skeleton of beads increased the toughness of the beads and improved the adsorption capacity of Cu 2+ . The adsorption rate of Cu 2+ on SA beads was conformed to the pseudo-rst order kinetic equation, while the adsorption behavior of Cu 2+ on SAC or SAB beads could be con rmed to the pseudo-second-order kinetic equation. Compared with the saturated adsorption capacity 510 mg/g of Cu 2+ on SA, the saturated adsorption capacity of Cu 2+ on SAB and SAC reached 817 mg/g and 822 mg/g, respectively, with their Cu 2+ adsorption e ciency over 95% at 25°C. Thus, SAC and SAB beads could be used as adsorption material for detecting and removing Cu 2+ from wastewater.

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Electrochemical reduction of Cr(VI) in the presence of sodium alginate and its application in water purification

Cited by 39 publications

References 45 publications

Use of sodium alginate biopolymer as an extracting agent of methylene blue in the polymer‐enhanced ultrafiltration technique

Use of sodium alginate biopolymer as an extracting agent of methylene blue in the polymer‐enhanced ultrafiltration technique

Adsorptive dead-end filtration for removal of Cr(vi) using novel amine modified polyacrylonitrile ultrafiltration membranes

Ion Imprinted Sodium Alginate Hydrogel Beads Enhanced with Carboxymethyl Cellulose and β-Cyclodextrin to Improve Adsorption for Cu2+

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