Biosorption of Chromium(VI) From Aqueous Solutions by Green Algae Spirogyra Species

Department of Chemistry, University of Roorkee, India.
Water Research (Impact Factor: 5.53). 01/2002; 35(17):4079-85. DOI: 10.1016/S0043-1354(01)00138-5
Source: PubMed


Biosorption of heavy metals is an effective technology for the treatment of industrial wastewaters. Results are presented showing the sorption of Cr(VI) from solutions by biomass of filamentous algae Spirogyra species. Batch experiments were conducted to determine the adsorption properties of the biomass and it was observed that the adsorption capacity of the biomass strongly depends on equilibrium pH. Equilibrium isotherms were also obtained and maximum removal of Cr(VI) was around 14.7 x 10(3) mg metal, kg of dry weight biomass at a pH of 2.0 in 120 min with 5 mg/l of initial concentration. The results indicated that the biomass of Spirogyra species is suitable for the development of efficient biosorbent for the removal and recovery of Cr(VI) from wastewater.

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    • "Recently, the removal of metals, compounds and particulates from solution by biological material is recognized as an extension to adsorption and is named as biosorption [11]. Examples of biosorbents are [12], Algae [13], seaweeds [14] microorganisms [15], [16] and several biopolymers [17]. Chitin, which is the major component of carapaces, crusts and shells of crustaceans is the second most abundant organic resource next to cellulose on earth and the most abundant biopolymer in nature that is widely used for the adsorption of heavy metal ions [18], [19]. "

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    • "Thus , researchers are interested to use low cost adsorbents like activate carbon (Lotfi et al 2002, Karthikeyan et al 2005, Rao et al 2007,), fly ash and bagasee fly ash (Gupta, et al 2001, M.Rao et al 2002 , Das 2006, ), treated sawdust [Gupta et al , Ho et al 1998 , Yu, et al 2003, Baral et al 2006) , Tea factory waste (Datta.J et al 2013) , sunflower stem (Jain et al 2009), agriculture waste ( Orhan et al , 1993) , wheat shell (Das Saha et al 2012) , sugarcane bagasse (Karthikeyan et al 2005 ), coconut shell , crabshell (Aziz et al 2001], Wood carbon and many other adsorbents (Sharma 2003) to investigate the rate of adsorption, optimum adsorption capacity, equilibrium time, effect of contact time, adsorbent amount, solute concentration and pH on removal of hexavalent Cr (Mohan, et al 2002 , Kalavathy,et al 2005) . Biosorption of chromium(VI) from aqueous solutions by green algae has been studied by Gupta et al (2001, ) ,. "
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    ABSTRACT: Adsorption of chromium (VI) compounds from aqueous solution were investigated using mixed saw dust, a waste product of Sawmill as adsorbents in adsorption process . The influence of different operating parameters like adsorbent amount , solute concentration , time of contact and temperature on percentage removal of chromium (VI) has been noted . It was found that the percentage removal of Cr increases with the increase of time and adsorbent amount up to a certain limit. The concentration of free Cr(VI) ions in the effluent is determined spectro-photometrically by developing a purple-violet color with 1,5-diphenyl carbazide in acidic solution as a complexing agent at 540 nm.. The results show that about 85-99 % reduction of Cr(VI) was achieved from solutions of various concentration depending on solute concentration. The kinetics of adsorption of hexavalent chromium on sawdust has been analysed using first order reversible, pseudo first order and pseudo second order model . An attempt has also been made to find out the rate constants , thermodynamic parameters like isosteric heat of adsorption and activation energy from the experimental results. Applicability of Freundlich Isotherm and rearranged Langmuir model has been investigated. It was noted that Langmuir’s model well described the equilibrium data for removal of Cr(VI) by sawdust. Results indicate that saw dust may be used as a promising low cost adsorbent for remova l of Cr(VI) from industrial wastes. Keywords : Saw dust , Adsorption, , Spectro-photometer, Isotherms, Kinetics, Rate Constants
    Full-text · Conference Paper · Sep 2015
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    • "e l s e v i e r . c o m / l o c a t e / e c o l e n g (Gupta et al., 2001; Davis et al., 2003; Vilar et al., 2006; Akhtar et al., 2007; Bulgariu and Bulgariu, 2013). However, the practical application of biosorption is very limited because of some problems with the biosorption technology. "
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    ABSTRACT: Application of the conventional bioreactors based on biosorption for removal of heavy metals is limited because they can be broken through by heavy metals. The novel calcifying cyanobacteria reactors based co-precipitation of heavy metals with carbonate minerals induced by cyanobacteria may be a promising alternative technology to overcome the shortcomings of biosorption. In this study, removal of cadmium (Cd) from wastewater using three calcifying bacterium Nostoc calcicola reactors was investigated. N. calcicola can significantly increase aquatic phase pH in the reactor, associated with a decrease of dissolved inorganic carbon (DIC) content in the effluent. During the two-month operation of the bioreactors, over 98% of Cd removal was obtained with an initial Cd2+ concentration of 2.5 μM. Cd2+ was mainly sequestrated in organic-bound fraction, followed by a small amount of carbonate and exchangeable fractions in the N. calcicola cell. A crystalline compound of Ca, C, and O, as well as a small amount of Cd on the surface of N. calcicola cell, was observed. The two-month high Cd removal efficiency of the N. calcicola reactors shows the calcifying cyanobacteria reactors have advantages over the conventional biosorption system, which can be shortly broken through for removal of heavy metals. Although the results revealed that calcifying cyanobacterium reactor is a promising way to remove Cd from water, assessment of its longer-term performance of heavy metal removal is needed.
    Full-text · Article · Aug 2015 · Ecological Engineering
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