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      Novel magnetic lignin composite sorbent for chromium(vi) adsorption

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          Abstract

          A novel magnetic lignin composite removes Cr( vi).

          Abstract

          A novel magnetic lignin composite was prepared and modified with diethylenetriamine. The properties of the composite were characterized by SEM, FTIR, XRD, TGA and VSM. Then, the adsorption of chromium( vi) from aqueous solutions using this magnetic lignin composite was investigated. Chromium( vi) removal is pH dependent and the optimum adsorption was observed at pH 2.0. The pseudo-second-order model and the Langmuir adsorption isotherm model were applied to describe the adsorption kinetics and adsorption isotherm, respectively, for the chromium( vi) adsorption. Thermodynamic parameters were calculated, which revealed the adsorption process to be spontaneous and exothermic. Regeneration of the magnetic lignin composite was achieved by using 0.4 M NaCl and 0.2 M NaOH, more than 87% efficiency retention was obtained after 5 cycles.

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          Deconstruction of lignocellulosic biomass with ionic liquids

          Agnieszka Brandt, John Gräsvik, Jason P. Hallett … (2013)
          Article 0 comments Cited 319 times – based on 0 reviews     Review now
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            A review of chemical, electrochemical and biological methods for aqueous Cr(VI) reduction.

            Carlos Barrera-Díaz, Violeta Lugo-Lugo, Bryan Bilyeu (2012)
            Hexavalent chromium is of particular environmental concern due to its toxicity and mobility and is challenging to remove from industrial wastewater. It is a strong oxidizing agent that is carcinogenic and mutagenic and diffuses quickly through soil and aquatic environments. It does not form insoluble compounds in aqueous solutions, so separation by precipitation is not feasible. While Cr(VI) oxyanions are very mobile and toxic in the environment, Cr(III) cations are not. Like many metal cations, Cr(III) forms insoluble precipitates. Thus, reducing Cr(VI) to Cr(III) simplifies its removal from effluent and also reduces its toxicity and mobility. In this review, we describe the environmental implications of Cr(VI) presence in aqueous solutions, the chemical species that could be present and then we describe the technologies available to efficiently reduce hexavalent chromium.
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              Adsorption of chromium (VI) by ethylenediamine-modified cross-linked magnetic chitosan resin: isotherms, kinetics and thermodynamics.

              Xin-jiang Hu, Jing-Song Wang, Yun-Guo Liu … (2011)
              The adsorption of chromium (VI) ions from aqueous solution by ethylenediamine-modified cross-linked magnetic chitosan resin (EMCMCR) was studied in a batch adsorption system. Chromium (VI) removal is pH dependent and the optimum adsorption was observed at pH 2.0. The adsorption rate was extremely fast and the equilibrium was established within 6-10min. The adsorption data could be well interpreted by the Langmuir and Temkin model. The maximum adsorption capacities obtained from the Langmuir model are 51.813mgg(-1), 48.780mgg(-1) and 45.872mgg(-1) at 293, 303 and 313K, respectively. The adsorption process could be described by pseudo-second-order kinetic model. The intraparticle diffusion study revealed that film diffusion might be involved in the present case. Thermodynamic parameters revealed the feasibility, spontaneity and exothermic nature of adsorption. The sorbents were successfully regenerated using 0.1N NaOH solutions.
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                Author and article information

                Journal
                Journal ID (publisher-id): RSCACL
                Title: RSC Advances
                Abbreviated Title: RSC Adv.
                Publisher: Royal Society of Chemistry (RSC)
                ISSN (Electronic): 2046-2069
                Publication date Created: 2015
                Publication date (Electronic): 2015
                Volume: 5
                Issue: 17
                Pages: 13028-13035
                Affiliations
                [1 ]The Key Laboratory of Food Colloids and Biotechnology
                [2 ]Ministry of Education
                [3 ]School of Chemical and Material Engineering
                [4 ]Jiangnan University
                [5 ]Wuxi 214122
                Article
                DOI: 10.1039/C4RA15546G
                SO-VID: 38cd9199-0034-4c51-b194-2ea362b9f456
                Copyright © © 2015
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