Removal of chromates from drinking water by anion exchangers

Korngold, E.; Belayev, N.; Aronov, L.

doi:10.1016/s1383-5866(03)00006-6

Cited by 68 publications

(42 citation statements)

References 4 publications

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“…The toxicity of such metal ions arise due to their non-biodegradable nature thereby accumulating in the living cells and impairing the normal functions of various organs of living beings. Technologies like chemical precipitation, electrochemical separation, membrane separation, reverse osmosis, ion exchange and adsorption resins though effective for metal remediation, yet are not competitive in industrial application [9][10][11][12][13][14][15][16][17][18][19][20][21][22]. Such methods involve either large capital or operational costs, and are not effective in removing metal ions present in ppm levels [12,18].…”

Section: Introductionmentioning

confidence: 99%

Adsorption isotherm and kinetics analysis of hexavalent chromium and mercury on mustard oil cake

Reddy

Chauhan

Chakraborty

2016

Environmental Engineering Research

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The biosorption process has been established as characteristics of dead biomasses of both cellulosic and microbial origin to bind metal ion pollutants from aqueous suspension. The high effectiveness of this process even at low metal concentration, similarity to ion exchange treatment process, but cheaper and greener alternative to conventional techniques have resulted in a mature biosorption technology. Yet its adoption to large scale industrial wastewaters treatment has still been a distant reality. The purpose of this review is to make in-depth analyses of the various aspects of the biosorption technology, staring from the various biosorbents used till date and the various factors affecting the process. The design of better biosorbents for improving their physico-chemical features as well as enhancing their biosorption characteristics has been discussed. Better economic value of the biosorption technology is related to the repeated reuse of the biosorbent with minimum loss of efficiency. In this context desorption of the metal pollutants as well as regeneration of the biosorbent has been discussed in detail. Various inhibitions including the multi mechanistic role of the biosorption technology has been identified which have played a contributory role to its non-commercialization.

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Section: Introductionmentioning

confidence: 99%

Adsorption isotherm and kinetics analysis of hexavalent chromium and mercury on mustard oil cake

Reddy

Chauhan

Chakraborty

2016

Environmental Engineering Research

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“…chromium(VI) is a highly toxic metal that has been linked to cancer in humans following prolonged inhalation, and is toxic to aquatic life at relatively low concentrations (US Environmental Protection Agency (EPA), 1998). The maximum permitted level of chromium for drinking water is 0.05 mg/L [2,3].…”

Section: Introductionmentioning

confidence: 99%

Removal of Cr(VI) from alkaline aqueous solutions using chemically modified magnetic chitosan resins

Elwakeel

2010

Desalination

156

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“…We also concluded that the active form of Cr(VI) that could be adsorbed by POT/Pmc and P2ClAn/Pmc was HCrO Pmc and P2ClAn/Pmc composites, which was attributed to the stronger electrostatic attraction. 39,41,42 Another explanation could have been that at very low pH values, the surface of the sorbent was also surrounded by the hydronium ions, which enhanced Cr(VI) interaction with the binding sites of the sorbent by greater attractive forces. As the pH increased, however, the overall surface charge on the sorbents became negative and sorption decreased.…”

Section: Effect Of Phmentioning

confidence: 99%

Composites of poly(2‐chloroaniline) and poly(o‐toluidine) with pumice and their application in the removal of chromium(VI) ions from aqueous solutions

Gök

Göde

2007

J of Applied Polymer Sci

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Poly(2-chloroaniline) (P2ClAn)/pumice (Pmc) and poly(o-toluidine) (POT)/Pmc composites were synthesized via the chemical oxidative polymerization of 2-chloroaniline and o-toluidine in the presence of a dispersion of Pmc powders in water solvent with an (NH 4 ) 2 S 2 O 8 oxidant. The composites were characterized with Fourier transform infrared (FTIR) spectroscopy, thermo-gravimetric/differential thermal analysis (TG-DTA), and scanning electron microscopy devices. The presence of P2ClAn and POT in the structure of the composites was confirmed by FTIR. The results of analysis show strong interactions between the homopolymers and Pmc. The applicability of the P2ClAn/ Pmc and POT/Pmc composites were investigated for the removal of Cr(VI) ions in water. Batch adsorption experiments were carried out as a function of pH, initial concentration, time, adsorbent dosage, and temperature. The batch sorption kinetics were tested, and the applicability of the Langmuir and Freundlich adsorption isotherms for this system was tested at 20 6 18C. An initial pH of 3.0 was most favorable for Cr(VI) removal by all adsorbents. The adsorption capacities obtained were 0.187 and 4.959 mmol/g of adsorbent for POT/Pmc and P2ClAn/Pmc from the Freundlich and Langmuir adsorption isotherms, respectively.

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Removal of chromates from drinking water by anion exchangers

Cited by 68 publications

References 4 publications

Adsorption isotherm and kinetics analysis of hexavalent chromium and mercury on mustard oil cake

Adsorption isotherm and kinetics analysis of hexavalent chromium and mercury on mustard oil cake

Removal of Cr(VI) from alkaline aqueous solutions using chemically modified magnetic chitosan resins

Composites of poly(2‐chloroaniline) and poly(o‐toluidine) with pumice and their application in the removal of chromium(VI) ions from aqueous solutions

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