Removal of Cr (VI) by electrochemical reduction

Lakshmipathiraj, P.; Raju, G Bhaskar; Basariya, M. Raviatul; Parvathy, S.; Prabhakar, S.

doi:10.1016/j.seppur.2007.07.053

Cited by 149 publications

(57 citation statements)

References 25 publications

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“…For the toxic nature of Cr(VI) in aqueous medium, it becomes a serious environmental issue to remove it from water. Various techniques such as adsorption [13][14][15], chemical reduction [16], reverse osmosis [17], electrolysis [18], etc. have been employed for Cr(VI) removal from waste water.…”

Section: Introductionmentioning

confidence: 99%

Adsorption and reduction: combined effect of polyaniline emeraldine salt for removal of Cr(VI) from aqueous medium

Baruah

Mahanta

2016

Bull Mater Sci

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In this study, we have reported the removal of Cr(VI) ions by polyaniline (PANI) particles from aqueous medium. PANI in its emeraldine salt (ES) form can interact with Cr(VI), which is present as HCrO − 4 in two ways. The adsorption of HCrO − 4 ions due to the electrostatic interaction between partially positively charged PANI backbone and Cr(VI) anions causes the major portion of Cr(VI) removal and a small portion of Cr(VI) is reduced to Cr(III) by PANI (ES). The adsorption follows Langmuir adsorption isotherm and second-order kinetic model. It is observed that the removal of Cr(VI) is negligibly effected by the presence of other anions in the aqueous medium. The adsorption capacity of PANI (ES) is found to be 123 mg g −1 , which is very high compared to activated carbonbased materials. The adsorbed anions can be desorbed by converting PANI emeraldine salt (ES) to PANI emeraldine base (EB). The EB form of PANI can be converted into ES form by treating with acid, which can be reused as adsorbent. It is important to note that the PANI (ES) is oxidized by HCrO −4 ions which decrease the hydrophilicity of the surface of PANI particles. This causes the decrease in adsorption capacity of recycled PANI.

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Section: Introductionmentioning

confidence: 99%

Adsorption and reduction: combined effect of polyaniline emeraldine salt for removal of Cr(VI) from aqueous medium

Baruah

Mahanta

2016

Bull Mater Sci

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“…In contrast, Cr(VI) species are known to be highly toxic and readily mobile in biological systems, causing serious health problems such as liver damage and pulmonary complications (Eary and Rai, 1988;Yurik and Pikaev, 1999). Therefore, Cr(VI) reduction methods for remediating Crcontaminated sites have been actively investigated, including conventional chemical reduction (Lan et al, 2005(Lan et al, , 2006Li et al, 2007); photocatalytic reduction (Gaberell et al, 2003;Sun et al, 2009;Tian et al, 2010); electrochemical reduction (Lakshmipathiraj et al, 2008;Olmez, 2009); and bioreduction (Cheung and Gu, 2007;Patra et al, 2010;Contreras et al, 2011). Cr(III), the product of Cr(VI) reduction, is subsequently removed from 2006; Zhou et al, 2007); however, the extremely fine particle sizes of schwertmannite render it very difficult to be utilized in combination with traditional filtration techniques in practice, i.e., solid-liquid separation (Eskandarpour et al, 2008).…”

Section: Introductionmentioning

confidence: 99%

Cr(VI) removal by biogenic schwertmannite in continuous flow column

Chen

Zhang

et al. 2014

Geochem. J.

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“…A long list of methods is available for the removal of Cd(II)such as chemical precipitation, ion exchange resin, electrochemical reduction method and activated carbon adsorption [1][2].The agricultural wastes such as wheat straw, peanut shell, cotton, corn cob etc. have a natural capacity for adsorption of heavy metal ions because they have some natural group and micro-pore structure for ion-exchange adsorption [3][4].…”

Section: Introductionmentioning

confidence: 99%

Adsorption Isotherm Study of Cd(II) by Polyamine Wheat Straw Cellulose

Pan¹,

Chen²,

Shi³

et al. 2015

Proceedings of the 2nd International Conference on Civil, Materials and Environmental Sciences

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Abstract-Wheat Straw Cellulose (WSC) modified by diethylenetriamine was investigated as an adsorbent for Cd(II) removal from aqueous solution. The preparing parameters on preparation of Polyamine Wheat Straw Cellulose (PWSC) were optimized. The effects of pH, adsorbent dose, contact time and initial concentration on the Cd(II) removal process were studied by using batch methods. The maximum adsorption capacity of Cd(II) onto PWSC was found to be 21.37mg/g and the removal percentage was more than 90%. The adsorption isotherms were analyzed using the Langmuir and Freundlich isotherms. The results showed that the adsorption process was well described by Langmuir isotherm model with correlation coefficients (R) of 0.9981 for Cd(II) adsorption.

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Removal of Cr (VI) by electrochemical reduction

Cited by 149 publications

References 25 publications

Adsorption and reduction: combined effect of polyaniline emeraldine salt for removal of Cr(VI) from aqueous medium

Adsorption and reduction: combined effect of polyaniline emeraldine salt for removal of Cr(VI) from aqueous medium

Cr(VI) removal by biogenic schwertmannite in continuous flow column

Adsorption Isotherm Study of Cd(II) by Polyamine Wheat Straw Cellulose

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