Kinetics of the reduction of hexavalent chromium with the brown seaweed Ecklonia biomass

Park, Donghee; Yun, Yeoung‐Sang; Ahn, Chi Kyu; Park, Jong

doi:10.1016/j.chemosphere.2006.05.068

Cited by 167 publications

(193 citation statements)

References 26 publications

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“…In another study, on the other hand, at low and high pH values, heavy metals had a higher redox potential and favored metal bioreduction (Esmaeili and Darvish 2014). In addition, reductions in the biomass such as carbohydrate and protein could supply electrons for Ni(II) bioreduction, with partial release of soluble organics or final oxidized product (Park et al 2004). According to Fig.…”

Section: Batch Biosorption Studiesmentioning

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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Section: Batch Biosorption Studiesmentioning

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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“…The presence of Cr(VI) is also possible, however, the quantifications was not possible due to the existence of noise peaks. Park et al, [7,23] has established two possible mechanism for the removal of Cr(VI) from aqueous solution by dead fungal biomass. According to which, the first mechanism involves direct reduction of Cr(VI) to Cr(III) in the aqueous solution by contact with the biomass.…”

Section: Mechanism Of Chromium Removalmentioning

confidence: 99%

“…These processes may be ineffective or extremely expensive especially when the metals in solution are in the range of 1-100 mg/l [4]. Hence many researchers worked on the biosorption of Cr(VI) using different biosorbents such as Rhizopus, dead fungal biomass of Aspergillus niger, Rhizopus oryzae, Saccharomyces cerevisiae, Ecklonia biomass, peat moss and modified saw [5][6][7][8][9].…”

Section: Introductionmentioning

confidence: 99%

Kinetics and Equilibrium Studies on the Biosorption of Hexavalent Chromium From Aqueous Solutions Using Bacillus Subtilis Biomass

Sivaprakash¹,

Aravindhan²,

Rao³

et al. 2009

Appl Ecol Env Res

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Abstract. Heavy metal contamination of industrial effluents is one of the significant environmental problems due to their toxic nature and accumulation throughout the food chain as non-biodegradable pollutants. In this study, dead Bacillus subtilis biomass was assessed for its efficiency to remove chromium(VI) from aqueous solutions. Optimum pH and temperature for biosorption of Cr(VI) were found to be 2.0 and 30oC, respectively. The biomass has the maximum biosorption capacity of 14.54 mg/g of biomass at 100 ppm initial chromium concentration and 2 g/l biomass loading. The biosorption process followed pseudo first order kinetic model, implying that the initial rate of biosorption is totally independent of the initial concentration. The biosorption of Cr(VI) is well described by Langmuir isotherm, which express the existence of monolayer adsorption under the experimental conditions. The adsorptiondesorption experiments performed inferred the reusability of the biomass. X-ray photoelectron spectroscopy studies revealed that chromium bound on to the B. subtilis biomass was in trivalent form.

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“…Qafoku et al (2010) also found that sediments rich in Fe(II)-bearing minerals exposed to acidic waste liquids would result in releasing ferrous ions and ultimately reducing Cr(VI). In addition, because Cr(VI) has lower redox potential values at higher pH, the higher pH is detrimental to the reduction of Cr(VI) (Park et al 2004;Su and Ludwig 2005).…”

Section: Introductionmentioning

confidence: 99%

Effects of liming on Cr(VI) reduction and Cr phytotoxicity in Cr(VI)-contaminated soils

Chen

Juang

Lee

2012

Soil Science and Plant Nutrition

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Liming is the most common approach for the amelioration of soil acidity in agriculture, and is widely used to reduce the mobility and bioavailability of heavy metals in soil. The purpose of this study was to investigate the hexavalent chromium [Cr(VI)] reduction and chromium (Cr) phytotoxicity in Cr(VI)-contaminated soils at different pH levels as a result of liming. Calcium carbonate (CaCO 3 ) was added to two acid agricultural soils of Taiwan (Neipu and Pinchen) at their natural pH of about 4, to adjust soil pH to approximately 5 and 6, respectively. The soils were then spiked with six levels of Cr(VI) (0, 150, 300, 500, 1000 and 1500 mg kg À1). X-ray absorption near edge structure spectroscopy (XANES) of Cr was used to determine the extent of the reduction of Cr(VI) at different pH levels. At the same time, extractions of Cr by Dowex M4195 and Chelex 100 resins were carried out to determine the availability of Cr(VI) and trivalent chromium [Cr(III)] in the Cr(VI)-spiked soils, respectively. Also, a pot experiment with wheat (Triticum vulgare) seedlings was carried out to test the phytotoxicity of the Cr(VI)-spiked soils. The results showed that for Cr(VI)-contaminated soils which contain a high amount of organic matter, such as the Neipu soil, the effect of liming on Cr(VI) reduction and Cr phytotoxicity is insignificant. However, for Cr(VI)-contaminated soils which have a low amount of organic matter, such as the Pinchen soils, liming could decrease the extent of Cr(VI) reduction and increase the availability of Cr(VI), thereby enhancing the phytotoxicity of Cr.

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Kinetics of the reduction of hexavalent chromium with the brown seaweed Ecklonia biomass

Cited by 167 publications

References 26 publications

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

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

Kinetics and Equilibrium Studies on the Biosorption of Hexavalent Chromium From Aqueous Solutions Using Bacillus Subtilis Biomass

Effects of liming on Cr(VI) reduction and Cr phytotoxicity in Cr(VI)-contaminated soils

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