XAS and XPS studies on chromium-binding groups of biomaterial during Cr(VI) biosorption

Park, Donghee; Yun, Yeoung‐Sang; Park, Jong

doi:10.1016/j.jcis.2007.09.049

Cited by 241 publications

(147 citation statements)

References 28 publications

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“…19 Iron metal has been intensively investigated as Cr(VI) reducing agent. 18,20,21 During this reaction, metallic iron is oxidized to Fe(III) while Cr(VI) is reduced to Cr(III), forming insoluble hydroxides. However, under environmental conditions, metallic iron shows a kinetic limitation with low reaction rates and rapid deactivation due to passivation of the metallic surface.…”

Section: Use Of Iron Phases For the Reduction Of Cr(vi) Contaminantsmentioning

confidence: 99%

Iron: a versatile element to produce materials for environmental applications

Teixeira¹,

Tristão²,

Araújo³

et al. 2012

J. Braz. Chem. Soc.

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Ferro é um elemento versátil que forma várias fases com diferentes estados de oxidação e estruturas, tais como Fe 0 , FeO, Fe 3 O 4 , γ-Fe 2 O 3 , α-Fe 2 O 3 e FeOOH. Todas estas fases têm propriedades físico-químicas únicas que podem ser usadas para diferentes aplicações. Neste trabalho, descreve-se o uso de diferentes compostos de ferro, sintéticos e também naturais ou de rejeitos, em aplicações ambientais e tecnológicas. Duas áreas principais de pesquisa são descritas. A primeira é relacionada às estratégias para aumentar a reatividade de fases de ferro pela formação de compósitos Fe 0 /Fe óxido e pela introdução de novos metais na estrutura de óxidos de ferro para promover novas reações superficiais. A segunda área de pesquisa é o uso das propriedades magnéticas de algumas fases de ferro para produzir materiais magnéticos versáteis com aplicações focadas em adsorção, catálise e emulsões.Iron is a versatile element forming several phases with different oxidation states and structures, such as Fe 0 , FeO, Fe 3 O 4 , γ-Fe 2 O 3 , α-Fe 2 O 3 and FeOOH. All these phases have unique physicochemical properties which can be used for different applications. In this work, it is described the use of different iron compounds, synthetic and also from natural and waste sources, in environmental and technological applications. Two main research areas are described. The first one is related to strategies to increase the reactivity of Fe phases, mainly by the formation of Fe 0 /iron oxide composites and by the introduction of new metals in the iron oxide structure to promote new surface reactions. The second area is the use of the magnetic properties of some iron phases to produce versatile magnetic materials with focus in adsorption, catalysis and emulsions.

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Section: Use Of Iron Phases For the Reduction Of Cr(vi) Contaminantsmentioning

confidence: 99%

Iron: a versatile element to produce materials for environmental applications

Teixeira¹,

Tristão²,

Araújo³

et al. 2012

J. Braz. Chem. Soc.

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“…It was obvious that the binding energy peaks of Cr2p were observed at 577.1 and 578.7 eV, which were attributed Cr2O3. For Cr2O3, significant bands appeared at binding energies of 576.0-579.0 eV which including 576.11, 577.10, 577.90, 578.90 and 579.72 eV [34,35].…”

Section: Xps Analysis Of Reduced Production Of Cr (Vi) On Cathodementioning

confidence: 99%

Enhanced Performance for Treatment of Cr (VI)-Containing Wastewater by Microbial Fuel Cells with Natural Pyrrhotite-Coated Cathode

Shi

Zhao

Liu

et al. 2017

Water

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Abstract:Here we reported the investigation of enhanced performance for the removal of hexavalent chromium (Cr (VI)) by a new microbial fuel cell (MFC) with natural pyrrhotite-coated cathode. By comparisons of the graphite-cathode, the MFCs equipped with a pyrrhotite-coated cathode generated the maximum power density of 45.4 mW·m −2 that was 1.3 times higher than that of with bare graphite cathode (35.5 mW·m −2 ). Moreover, the Cr (VI) removal efficiency of 97.5% achieved after 4.5 h compared with only 46.1% by graphite cathode MFC. In addition, Cr (VI) removal rate with different initial Cr (VI) concentrations for 10 mg/L and 30 mg/L was investigated and a decreased removal percentage with increasing Cr (VI) concentration was observed. Batches of experiments of different pH values from 3.0 to 9.0 in catholyte were carried out to optimize system performance. The complete Cr (VI) removal was achieved at pH 3.0 and 99.59% of Cr (VI) was removed after 10.5 h, which met the requirement of the Cr (VI) National Emission Standard. When the value of pH was decreasing, the removal rate was obviously increased and Cr (VI) could be removed successfully with a broad pH range indicating pyrrhotite-coated cathode MFC had more extensive usage scope. Furthermore, cathode treatment products were studied by X-ray photoelectron spectroscopy (XPS), Cr 2 O 3 , Cr (III)-acetate were detected on the cathode by the XPS Cr2p spectra and no Cr (VI) founded, indicating that the Cr on the surface of cathode was Cr (III) and Cr (VI) were reduced. On cathode, pyrrhotite not only played a significant role for catalyst of MFCs, but also acted as reactive sites for Cr (VI) reduction. Our research demonstrated that pyrrhotite, an earth-abundant and low-cost natural mineral was promised as an effective cathode material. Which had great potential applications in MFCs for reduction of wastewater containing heavy metals and other environmental contaminants in the future.

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“…Chromium and its compounds are extensively used in industry, with the most usual and important sources coming from the alloy reparation, metal cleaning and processing, leather tanning, wood preservation, ore processing, and petroleum refining processes [1,2]. In the effluents from these industries, chromium is present primarily as hexavalent chromium (Cr(VI)) and trivalent chromium (Cr(III)).…”

Section: Introductionmentioning

confidence: 99%

“…It has been reported that brown seaweeds are capable of removing Cr(VI) from aqueous phase [2,7,9,10,13]. In the biosorption process, Cr(VI) can be bound onto the surface of brown seaweeds through anionic adsorption, and/or can be converted to Cr(III) via the abiotic reduction [9].…”

Section: Introductionmentioning

confidence: 99%

“…In the biosorption process, Cr(VI) can be bound onto the surface of brown seaweeds through anionic adsorption, and/or can be converted to Cr(III) via the abiotic reduction [9]. However, it has also been found that the adsorption of Cr(VI) onto brown seaweeds is a rather slow process, with the time required for reaching sorption equilibrium being 24-72 h or even hundreds of hours [2,10,[13][14][15]. On the other hand, brown seaweeds are recognized to offer much faster adsorption kinetics for cationic metal ions, and the biosorption equilibrium can generally be achieved in several hours [10,16,17].…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Combination of electroreduction with biosorption for enhancement for removal of hexavalent chromium

Hou

Liu

Zhao

et al. 2012

Journal of Colloid and Interface Science

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a b s t r a c tHexavalent chromium is one of the most toxic heavy metals in aqueous solutions. It has been well documented that the brown seaweed can be used as a promising biosorbent for the sequestration of this heavy metal from wastewater. However, the uptake of Cr(VI) is reportedly a rather slower process; the sorption equilibrium can only be established after a few days, much slower than a few hours for the trivalent chromium ion. In this study, we developed a novel technology of electrochemically assisted biosorption (ECAB) system for the enhancement of the treatment efficiency. It was found through our study that the removal efficiencies of Cr(VI) and total chromium were greatly enhanced by 48.1% and 51.3%, respectively, with the application of À1.0 V in the ECAB system. The conversion of Cr(III) due to the electroreduction of Cr(VI) and the higher pH due to the cathodic H 2 evolution created a favorable condition for the uptake of chromium onto the modified seaweed (MSW). The reduction and adsorption of Cr(VI) by MSW was proved to play a minor role in the removal. Both direct electroreduction and indirect electroreduction by atomic H Ã contributed to the reduction of Cr(VI).

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XAS and XPS studies on chromium-binding groups of biomaterial during Cr(VI) biosorption

Cited by 241 publications

References 28 publications

Iron: a versatile element to produce materials for environmental applications

Iron: a versatile element to produce materials for environmental applications

Enhanced Performance for Treatment of Cr (VI)-Containing Wastewater by Microbial Fuel Cells with Natural Pyrrhotite-Coated Cathode

Combination of electroreduction with biosorption for enhancement for removal of hexavalent chromium

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