A comparative study on heavy metal biosorption characteristics of some algae
TL;DR: In this article, the authors used the Freundlich and Langmuir adsorption models for describing the short-term biosorption of copper(II), nickel(II) and chromium(VI) by all three algae species.
About: This article is published in Process Biochemistry.The article was published on 1999-10-01. It has received 560 citations till now. The article focuses on the topics: Biosorption & Freundlich equation.
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TL;DR: In this article, a review examines a wide variety of microorganisms (fungi, yeasts, bacteria, etc.), which are capable of uptake of organic pollutants, discusses various mechanisms involved in biosorption, discusses the effects of various parameters such as pH, temperature, concentrations of organic pollutant, other ions, and biomass in solution, pretreatment method, etc.
1,825 citations
TL;DR: The sorption capacities of commercial developed carbons and other low cost sorbents for chromium remediation are provided, and particular attention is paid to comparing the sorption efficiency and capacities of commercially available activated carbons to otherLow cost alternatives.
1,611 citations
Cites background or methods from "A comparative study on heavy metal ..."
...[215] 30 Activated carbon [107] 31 Peat moss [269] 32 Chitosan impregnated with a microemulsion [277]...
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...vulgaris [215] 29 Algae, Synechocystis sp....
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...[215] removed Cr(VI) by adsorption on dried hlorella vulgaris, Scenedesmus obliquus and Synechocystis sp....
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TL;DR: The purpose of this paper is to review the available information on various attributes of utilization of microbial and plant derived biomass and explores the possibility of exploiting them for heavy metal remediation.
1,466 citations
TL;DR: High efficiency, high biosorption capacity, cost-effectiveness and renewability are the important parameters making these materials as economical alternatives for metal removal and waste remediation.
758 citations
Cites background from "A comparative study on heavy metal ..."
...The equilibrium times for metal biosorption by both WS and WB have been found to be relatively shorter than widely utilized algae, sea-weeds (Dönmez et al., 1999; Suzuki et al., 2005; Valdman and Leite, 2000)....
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TL;DR: Commercial application of algal technology for metal removal from wastewaters, emphasis should be given to selection of strains with high metal sorption capacity, adequate understanding of sorption mechanisms, and development of low-cost methods for cell immobilization.
Abstract: Many algae have immense capability to sorb metals, and there is considerable potential for using them to treat wastewaters. Metal sorption involves binding on the cell surface and to intracellular ligands. The adsorbed metal is several times greater than intracellular metal. Carboxyl group is most important for metal binding. Concentration of metal and biomass in solution, pH, temperature, cations, anions and metabolic stage of the organism affect metal sorption. Algae can effectively remove metals from multi-metal solutions. Dead cells sorb more metal than live cells. Various pretreatments enhance metal sorption capacity of algae. CaCl2 pretreatment is the most suitable and economic method for activation of algal biomass. Algal periphyton has great potential for removing metals from wastewaters. An immobilized or granulated biomass-filled column can be used for several sorption/desorption cycles with unaltered or slightly decreased metal removal. Langmuir and Freundlich models, commonly used for fitting sorption data, cannot precisely describe metal sorption since they ignore the effect of pH, biomass concentration, etc. For commercial application of algal technology for metal removal from wastewaters, emphasis should be given to: (i) selection of strains with high metal sorption capacity, (ii) adequate understanding of sorption mechanisms, (iii) development of low-cost methods for cell immobilization, (iv) development of better models for predicting metal sorption, (v) genetic manipulation of algae for increased number of surface groups or over expression of metal binding proteins, and (vi) economic feasibility.
707 citations
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TL;DR: In this article, colorimetric methods of analysis were used for analysis of color data in the context of analysis of the color spectrum of a color-imetric method of analysis.
Abstract: Colorimetric methods of analysis , Colorimetric methods of analysis , کتابخانه مرکزی دانشگاه علوم پزشکی تهران
1,650 citations
TL;DR: The origin of many cyanobacteria currently in culture is poorly characterized because little more is known about their habitat than that they were derived from a soil sample, freshwater, or marine environment, which is rather restricted information.
Abstract: Publisher Summary This chapter focuses on the isolation and purification of Cyanobacteria. Cyanobacterial populations recognized in their natural habitat should be sampled with sterile instruments and placed in sterile containers to ensure the origin of eventual isolates. If funds permit, commercial sterile disposable scalpels, pipets, and plastic tubes are very convenient for this purpose. Only small quantities (a pea-size equivalent generally being ample) are required from habitats where macroscopic growth is visible. Sampling of endosymbiotic cyanobacteria from coralloid nodules of Cycadaceae or the stems of Gunnera can be performed as described for soil and rock-borne cyanobacteria, but other host-cyanobacteria associations might require more special treatments. To isolate cyanobacteria from lakes and ponds in which cyanobacterial growth is not visible with the eye (or even after examination with a portable microscope) it is advisable to take larger samples: 250- to 500-ml sterile screw-cap centrifuge pots, filled almost completely with sampling water, are convenient containers for transport and allow immediate concentration (by centrifugation) on arrival in the laboratory, the sampling volume generally being sufficient to isolate cyanobacteria present even in only low numbers. The origin of many cyanobacteria currently in culture is poorly characterized because little more is known about their habitat than that they were derived from a soil sample, freshwater, or marine environment, which is rather restricted information (although better than source unknown, another not uncommon description).
814 citations
TL;DR: Biomass of nonliving, dried brown marine algae Sargassum natans, Fucus vesiculosus, and Ascophyllum nodosum demonstrated high equilibrium uptake of cadmium from aqueous solutions and there was no damage to the biosorbent which retained its macroscopic appearance and performance in repeated metal uptake/elution cycles.
Abstract: Biomass of nonliving, dried brown marine algae Sargassum natans, Fucus vesiculosus, and Ascophyllum nodosum demonstrated high equilibrium uptake of cadmium from aqueous solutions. The metal uptake by these materials was quantitatively evaluated using sorption isotherms. Biomass of A. nodosum accumulated the highest amount of cadmium exceeding 100 mg Cd[sup 2+]/g (at the residual concentration of 100 mg Cd/L and pH 3.5), outperforming a commercial ion exchange resin DUOLITE GT-73. A new biosorbent material based on A. nodosum biomass was obtained by reinforcing the algal biomass by formaldehyde cross-linking. The prepared sorbent possessed good mechanical properties, chemical stability of the cell wall polysaccharides and low swelling volume. Desorption of deposited cadmium with 0.1-0.5 M HCl resulted in no changes of the biosorbent metal uptake capacity through five subsequent adsorption/desorption cycles. There was no damage to the biosorbent which retained its macroscopic appearance and performance in repeated metal uptake/elution cycles.
523 citations
TL;DR: Screening tests of different marine algae biomas types revealed a high passive biosorptive uptake of lead up to 270 mg Pb/g of biomass in some brown marine algae.
Abstract: Screening tests of different marine algae biomas types revealed a high passive biosorptive uptake of lead up to 270 mg Pb/g of biomass in some brown marine algae. Members of the order Fucales perfomed particularly well in this descending sequence: Fucus > Ascophyllum > Sargassum. Although decreasing the swelling of wetted biomass particles, their reinforcement by crosslinking may significantly affect the biosorption performance. Lead uptakes up to 370 mg Pb/g were observed in crosslinked Fucus vesiculosus and Ascophyllum nodosum. At low equilibrium residual concentrations of lead in solution, however, ion exchange resin Amberlite IR-120 had a higher lead uptake than the biosorbent materials. An order-of-magnitude lower uptake of nickel was observed in all of the sorbent materials examined. (c) 1994 John Wiley & Sons, Inc.
467 citations
TL;DR: This review summarizes the current literature, highlighting the potential benefits and problems associated with the development of novel algal-based bioremoval processes for the abatement of heavy metal pollution.
466 citations
"A comparative study on heavy metal ..." refers background or methods in this paper
...The Freundlich isotherm is also more widely used but provides no information on the monolayer adsorption capacity, in contrast to the Langmuir model [2,3,10–12]....
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...Ceq [2,3,11]....
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...To use algal biomass effectively for water purification and metal reclamation, it is important to understand the chemical nature of the metal binding process [2–13]....
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...However, bioremoval studies typically have used microbial biomass [2–13]....
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...New technologies are required that can reduce heavy metal concentrations to environmentally acceptable levels at affordable costs [1–4]....
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