Continuous sorption of synthetic dyes on dried biomass of microalga Chlorella pyrenoidosa
- 223 Downloads
The sorption of thioflavine T (TT) and malachite green (MG) cationic synthetic dyes on dried biomass of green microalga (Chlorella pyrenoidosa) immobilised in polyurethane foam under continuous column systems conditions using spectrophotometric methods of detection was investigated. Data characterising the sorption of TT and MG on microalgal biomass immobilised in polyurethane foam in a column system from single (C 0 = 25 μmol dm−3) or binary equimolar (C 0 = 25 μmol dm−3) dye solutions in the form of breakthrough curves were well described by the Thomas (R 2 = 0.994–0.912), Yoon-Nelson (R 2 = 0.994–0.911), and Clark (R 2 = 0.993–0.911) models. Useful parameters characterising the sorption column system were obtained from these mathematical models. The Thomas model, in particular, provided the Q max (maximal sorption capacity in μmol g−1) parameter for characterisation of biosorbent and also for evaluation of competitive effects in the TT and MG dyes sorption. For the purposes of biomass regeneration, a one-step desorption of the dyes studied from the microalgal biomass in batch and continuous column systems was performed. Efficiency of TT desorption from microalgal biomass increased in the order: deionised H2O (50.7 %), 99.5 vol. % 1,4-dioxane (67 %), 20 mmol dm−3 NiCl2 (83 %), 96 vol. % ethanol (85 %), 0.1 mol dm−3 HCl (89 %), 1 mol dm−3 acetic acid (89 %). In the case of MG, the desorption efficiency increased in the order: deionised H2O (13 %), 20 mmol dm−3 NiCl2 (50 %), 0.1 mol dm−3 HCl (91 %), 99.5 vol. % 1,4-dioxane (94 %), 1 mol dm−3 acetic acid (99 %), 96 vol. % ethanol (> 99 %). The presence of carboxyl, phosphoryl, amino, and hydroxyl groups, the important functional groups for sorption of cationic xenobiotics, was also confirmed on the algae biomass surface by potentiometric titration and ProtoFit modelling software. The data obtained showed that the dried immobilised algae biomass could be used as a sorbent for removing toxic xenobiotics from liquid wastewaters or contaminated waters and also presenting the possibilities of mathematical modelling of sorption processes in continuous column systems in order to obtain important parameters for use in practice.
Keywordssynthetic dyes sorption desorption Chlorella pyrenoidosa continuous column system, modelling
Unable to display preview. Download preview PDF.
- Branquinho, C., & Brown, D. H. (1994). A method for studying the cellular location of lead in lichens. The Lichenologist, 26, 83–90. DOI: 10.1006/lich.1994.1007.Google Scholar
- Febrianto, J., Kosasih, A. N., Sunarso, J., Ju, I. H., Indraswati, N., & Ismadji, S. (2009). Equilibrium and kinetic studies in adsorption of heavy metals using biosorbent: A summary of recent studies. Journal of Hazardous Materials, 162, 616–645. DOI: 10.1016/j.jhazmat.2008.06.042.CrossRefGoogle Scholar
- Fernandez, M. E., Nunell, G. V., Bonelli, P. R., & Cukierman, A. L. (2010). Effectiveness of Cupressus sempervirens cones as biosorbent for the removal of basic dyes from aqueous solutions in batch and dynamic modes. Bioresource Technology, 101, 9500–9507. DOI: 10.1016/j.biortech.2010.07.102.CrossRefGoogle Scholar
- Gao, J. F., Zhang, Q., Su, K., & Wang, J. H. (2010). Competitive biosorption of Yellow 2G and Reactive Brilliant Red K-2G onto inactive aerobic granules: Simultaneous determination of two dyes by first-order derivative spectrophotometry and isotherm studies. Bioresource Technology, 101, 5793–5801. DOI: 10.1016/j.biortech.2010.02.091.CrossRefGoogle Scholar
- Khataee, A. R. Zarei, M., Dehghan, G., Ebadi, E., & Pourhassan, M. (2011). Biotreatment of a triphenylmethane dye solution using a Xanthophyta alga: Modeling of key factors by neural network. Journal of the Taiwan Institute of Chemical Engineers, 42, 380–386. DOI: 10.1016/j.jtice.2010.08.006.CrossRefGoogle Scholar
- Koprivanac, N., & Kusic, H. (2008). Hazardous organic pollutants in colored wastewaters (pp. 81). New York, NY, USA: Nova Science Publishers.Google Scholar
- Rathinam, A., Maharshi, B., Janardhanan, S. K., Jonnalagadda, R. R., & Nair, B. U. (2010). Biosorption of cadmium metal ion from simulated wastewaters using Hypnea valentiae biomass: A kinetic and thermodynamic study. Bioresource Technology, 101, 1466–1470. DOI: 10.1016/j.biortech.2009. 08.008.CrossRefGoogle Scholar
- Volesky, B. (2003). Sorption and biosorption (pp. 316). Quebec, Canada: BV Sorbex.Google Scholar
- Yoon, Y. H., & Nelson, J. H. (1984). Application of gas adsorption kinetics. I. A theoretical model for respirator cartridge service time. American Industrial Hygiene Association Journal, 45, 509–516. DOI: 10.1080/15298668491400197.Google Scholar