Hexavalent chromium removal mechanism using conducting polymers

Krishnani, Kishore Kumar; Srinives, Sira; Mohapatra, B. C.; Boddu, Veera M.; Hao, Jumin; Meng, Xiaoguang; Mulchandani, Ashok

doi:10.1016/j.jhazmat.2013.01.079

Cited by 111 publications

(49 citation statements)

References 24 publications

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“…It is well known that pH < pH PZC inhibits anionic adsorption . The effect of solution pH on Cr(VI) removal by aniline polymers has been widely studied and a similar tendency was observed in previous reports , , …”

Section: Resultssupporting

confidence: 77%

“…These results also demonstrated that the active sites of adsorption were protonated amine and imine segments and further testified to the occurrence of the redox reaction of oligoaniline and Cr(VI) ions. It is widely reported that the conjugated amine and imine groups in aniline polymers can reduce high potential Cr(VI) ions , . The total reaction between HCrO − and oligoaniline (Oani) was suggested to be as Equation .…”

Section: Resultsmentioning

confidence: 99%

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Efficient adsorption/reduction of aqueous hexavalent chromium using oligoaniline hollow microspheres fabricated by a template‐free method

Bao

Chen

Liu

et al. 2017

J of Chemical Tech & Biotech

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BACKGROUND Uniform and well‐dispersed hollow microspheres of oligoaniline were synthesized by a facile and template‐free method in alkaline medium. The morphology of oligoanilines was controlled from hollow to hard microspheres, by simply changing the volumes of alkaline medium. SEM, TEM, XRD, FTIR and physical adsorption of nitrogen were used to characterize the products. Hexavalent chromium ion uptake experiments were run with these aniline oligomers. RESULTS Adsorption experiments showed that the removal of chromium ions was strongly dependent on the initial pH of the solution. The pseudo‐second‐order kinetic and Langmuir isotherm models were well correlated with the experimental data. The adsorption of Cr(VI) and synergistic reduction to Cr(III) were confirmed by analyzing remnant chromium in the liquid and XPS detection of the exhausted adsorbent. A redox/pseudo‐protonation process was suggested as the mechanism to explain the Cr(VI) removal. The adsorbed chromium ions could be desorbed by NaOH solution. The higher desorption efficiency of 96.2% was achieved by using 1.0 mol L‐1 NaOH as the desorption agent. CONCLUSIONS It was observed that the hollow microsphere were the most effective adsorbent of the three adsorbents and its removal efficiency reached 99% to remove 60 mg L‐1 Cr(VI). The facile fabrication, efficient removal of Cr(VI) and simple regeneration offered an option to remove Cr(VI) contamination from natural water and industrial wastewater. © 2017 Society of Chemical Industry

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Section: Resultssupporting

confidence: 77%

Section: Resultsmentioning

confidence: 99%

Efficient adsorption/reduction of aqueous hexavalent chromium using oligoaniline hollow microspheres fabricated by a template‐free method

Bao

Chen

Liu

et al. 2017

J of Chemical Tech & Biotech

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show abstract

“…On the other hand, various research groups have explored polyaniline (PANI) and polypyrrole (PPy) as adsorbent for the removal of heavy metal ions from aqueous solution [11][12][13]. The most possible reason could be the presence of large amounts of amine (-NH) groups in the polymer enable them as a suitable candidate for the removal of heavy metals and easy of synthesis.…”

Section: Introductionmentioning

confidence: 99%

Removal of Cr(VI) ions by adsorption onto sodium alginate-polyaniline nanofibers

Rathinam¹,

Meenakshi²

2015

International Journal of Biological Macromolecules

177

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“…Cr(III) is poorly soluble and regarded as an essential micronutrient in biological activity, whereas Cr(VI) is quite soluble and highly toxic, even at low concentrations, and it can even cause carcinogenic effects [61]. In the literature, there are various works on the use of PANI for removing Cr(VI) from an aqueous medium [62][63][64], due to the environmental importance of this metal. However, there are few works on the use of this polymer in the detection and direct electrochemical quantification of Cr(VI).…”

Section: Applications In Sensors For Detecting Chromium (Vi)mentioning

confidence: 99%

Layer-by-Layer films based on biopolymers extracted from red seaweeds and polyaniline for applications in electrochemical sensors of chromium VI

Farias¹,

Santos²,

Dionísio³

et al. 2015

Materials Science and Engineering: B

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Hexavalent chromium removal mechanism using conducting polymers

Cited by 111 publications

References 24 publications

Efficient adsorption/reduction of aqueous hexavalent chromium using oligoaniline hollow microspheres fabricated by a template‐free method

Efficient adsorption/reduction of aqueous hexavalent chromium using oligoaniline hollow microspheres fabricated by a template‐free method

Removal of Cr(VI) ions by adsorption onto sodium alginate-polyaniline nanofibers

Layer-by-Layer films based on biopolymers extracted from red seaweeds and polyaniline for applications in electrochemical sensors of chromium VI

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