Biosorption of hexavalent chromium by raw and acid-treated green alga Oedogonium hatei from aqueous solutions

Gupta, Vinod Kumar; Rastogi, Arshi

doi:10.1016/j.jhazmat.2008.06.104

Cited by 502 publications

(235 citation statements)

References 37 publications

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“…Removal of Pb from the polluted waters and wastewaters is, therefore, important in terms of protection of the public and environmental health. Traditional metal-removal techniques from water such as precipitation, oxidation, reduction, electrochemical treatment, reverse osmosis, solvent extraction, ion-exchange and evaporation are mostly expensive and difficult to apply (Ö zcan et al 2009;Kul and Koyuncu 2010;Gupta et al 2012, Gupta andRastogi 2009). Compared with the traditional methods, adsorption has received specific attention because it has significant advantages including high efficiency, easy handling, high selectivity and minimum production of chemical or biological sludge (Randelovic et al 2012;Gupta et al 2007aGupta et al , b, 2009.…”

Section: Introductionmentioning

confidence: 99%

Removal of lead from aqueous solutions by a poly(acrylic acid)/bentonite nanocomposite

2014

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We synthesized a novel poly acrylic acid-organobentonite (PAA-Bent) nanocomposite by successive intercalation of cetyltrimethylammonium (CTA) surfactant and polyacrylic acid (PAA) into the bentonite (Bent) interlayer spaces. The surfactant-modified clay (CTABent) and PAA-Bent nanocomposite were characterized by XRD and FT-IR techniques and used for removal of Pb(II) from aqueous solution. The XRD results confirmed the intercalation of CTA and PAA into the interlayer spaces of the bentonite increasing the d 001 spacing of the clay from 12.2 up to 38.9 Å . FT-IR analysis of the modified clay samples revealed the functional groups of CTA and PAA constituents alighted on the bentonite surfaces. Maximum Pb sorption capacity of the Bent and PAA-Bent predicted by Langmuir model were 52.3 and 93.0 mg g -1 , respectively, showing that the synthesized nanocomposite superiorly adsorbed Pb from the solution as compared to the Bent. The maximum Pb removal efficiency of 99.6 % was achieved by the nanocomposite at 25°C with \30 min contact time for a 7.5 g L -1 solid-to-liquid ratio and an initial metal concentration of 400 mg L -1 . The results indicated that PAA-Bent nanocomposite can be efficiently used as a superadsorbent for the removal of Pb(II) from aqueous solution.

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Section: Introductionmentioning

confidence: 99%

Removal of lead from aqueous solutions by a poly(acrylic acid)/bentonite nanocomposite

2014

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“…Also, in this system, equilibrium occurred after 80 min. The initial rapid phase may involve physical adsorption or ion exchange at cell surface, and the subsequent slower phase may involve other mechanisms such as complexation, micro-precipitation, or saturation of binding sites (Gupta and Rastogi 2009).…”

Section: Effect Of Retention Timementioning

confidence: 99%

Biosorption of nickel and cobalt from plant effluent by Sargassum glaucescens nanoparticles at new membrane reactor

Esmaeili

Beni

2015

Int. J. Environ. Sci. Technol.

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In this study, brown algae (Sargassum glaucescens) nanoparticles were prepared by using a planetary ball mill to remove nickel and cobalt. The biosorption reaction in the reactor was studied under different conditions of pH, biosorbent dose, temperature, and retention time. The concentration of heavy metals was investigated after the fluid had passed through the membrane system. Algae nano-biosorbent was prepared using a planetary ball mill; scanning electron microscope and Brunauer-Emmert-Teller tests showed an average diameter of 95.75 nm and specific surface area of 11.25 m 2 /g, respectively. A maximum biosorption efficiency equal to 93 and 91 % was achieved for nickel and cobalt at pH 6, temperature 35°C with a retention time of 80 min, and at biosorbent doses of 8 and 4 g/l. The kinetic data fit well by pseudo-first-order model, and equilibrium data of metal ions could be described well with the Langmuir and Dubinin-Radushkevich isotherm models. The calculated thermodynamic parameters showed that metal ion biosorption is feasible, endothermic, and naturally spontaneous.

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“…Cr 2 O 3 contributes to reducing the efficiency of photosynthesis and thus other vital processes occurring in water (Ś widerskaBró _ z 1993). Several methods of chromium and other metal removal from aqueous solutions have been described in the literature (Gupta et al 2010c(Gupta et al , 2012cGupta and Sharma 2003;Saleh et al 2011;Gupta and Rastogi 2009).…”

Section: Introductionmentioning

confidence: 99%

Investigation of removal possibilities of chromium(III) oxide from water solution in the presence of albumins

Szewczuk-Karpisz

Wiśniewska

2014

Int. J. Environ. Sci. Technol.

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System destabilization is a highly desirable phenomenon during colloidal impurity removal from sewages and wastewaters. Therefore, in this study, the stability of chromium(III) oxide suspension in the absence and presence of albumins [bovine serum albumin (BSA), ovalbumin (OVA), human serum albumin (HSA)] was investigated. Based on the analysis of experimental results, i.e., measurements of adsorption amount, electrokinetic potential, and metal oxide surface charge density as well as system stability, the mechanism of the suspension stabilization/destabilization was proposed. The examined system without the albumins is relatively stable at pH 3, 4.6, and 9 (TSI = 34.8, 36.6, 34.22, respectively), which is associated with the electrostatic stabilization phenomenon. In turn, the least stable is the suspension at pH 7.6 (TSI = 55.43). This is the result of the adsorbent zero surface charge. Regardless of solution pH, the BSA, OVA, or HSA adsorption causes an increase in the system stability (17.55 \ TSI \ 30). Probably, the steric stabilization is involved in this phenomenon, which results from the mutual repulsion of the adsorption layers formed on the solid surface. Thus, it can be concluded that the albumin presence in the industrial wastewaters impedes the chromium(III) oxide removal.

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Biosorption of hexavalent chromium by raw and acid-treated green alga Oedogonium hatei from aqueous solutions

Cited by 502 publications

References 37 publications

Removal of lead from aqueous solutions by a poly(acrylic acid)/bentonite nanocomposite

Removal of lead from aqueous solutions by a poly(acrylic acid)/bentonite nanocomposite

Biosorption of nickel and cobalt from plant effluent by Sargassum glaucescens nanoparticles at new membrane reactor

Investigation of removal possibilities of chromium(III) oxide from water solution in the presence of albumins

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