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| Registros recuperados: 22 | |
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| Qaiser,Suleman; Saleemi,Anwar R; Umar,Muhammad. |
| The biosorption of lead(II) and chromium(VI) on groundnut hull was investigated. Batch biosorption experiments were conducted to find the equilibrium time and biosorption capacity. Effect of parameters like pH, temperature and initial metal concentration was studied. The maximum biosorption capacity of lead(II) and chromium(VI) was found to be 31.54 ± 0.63 and 30.21 ± 0.74 mg g-1, respectively. The optimum pH for lead(II) and chromium(VI) removal was 5 ± 0.1 and 2 ± 0.1, respectively. The temperature change, in the range of 20 - 45ºC affected the biosorption capacity. The maximum removal of lead(II) was achieved at 20 ± 2ºC, where as maximum uptake of chromium(VI) was observed at 40 ± 2ºC. The biosorption data was fitted to the Langmuir and the Freundlich... |
| Tipo: Journal article |
Palavras-chave: Biosorption; Equilibrium; Groundnut hull; Kinetics; Thermodynamics. |
| Ano: 2009 |
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582009000400003 |
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| Plaza Cazón,Josefina; Viera,Marisa; Donati,Edgardo. |
| Background: The increased industrial activity has resulted in the discharge of large amount of pollutants including non-degradable metals into the environment. Chromium is produced in several industrial processes and it can be found in the environment in two stable oxidation states, Cr(VI) and Cr(III). Cr(VI) is more hazardous due to its carcinogenic and mutagenic effects on living organisms. Although much less toxic, Cr(III) can also exert genotoxic effects under prolonged or severe exposure. It can be separated from the solution by precipitation but biosorption using brown algae seems to be an effective and sustainable treatment technique owing to its cost-effectiveness and environmental friendly characteristics. Macrocystis pyrifera and Undaria... |
| Tipo: Journal article |
Palavras-chave: Biosorption; Brown algae; Chromium; Heavy metals. |
| Ano: 2013 |
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582013000300006 |
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| Alpat,Senol; Alpat,Sibel Kilinç; Çadirci,Bilge Hilal; Özbayrak,Özge; Yasa,Ihsan. |
| Circinella sp. was employed as a biosorbent for removal of Ni(II) from aqueous solution. The biosorption kinetics and isotherms were investigated. The effect of several parameters, such as biosorbent dosage, contact time, initial concentration, pH and temperature, on biosorption process was evaluated. The kinetic studies indicated that the biosorption followed pseudo-second order kinetic model. Biosorption behaviour of Ni(II) on Circinella sp. was expressed by both Langmuir and Freundlich isotherms. The equilibrium data fit better to the Langmuir model compared to the Freundlich model in concentration range studied (1.0-3.0 mM). The thermodynamic parameters (ΔG0, ΔH0 and ΔS0) were also determined, and it was found that the Ni(II)... |
| Tipo: Journal article |
Palavras-chave: Biosorption; Circinella sp; Equilibrium; Kinetic; Nickel. |
| Ano: 2010 |
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582010000500004 |
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| Jensen,Thomas E; Crang,Mary C; Crang,Richard F.E.. |
| Two laboratory devices have been designed for experimental use in biosorption studies involving the uptake and controlled release of elements from encapsulated living cells of microorganisms. The first device is an alginate bead maker capable of producing uniform (1.5 mm diameter) sodium alginate beads with encapsulated microorganisms. The second device is a flow-cell that can subject the encapsulated microorganisms to changing fluids, streaming gaseous microaerophyllic conditions, and which also allows for samples of fluid and beads to be extracted at any time during changing experimental conditions. Both devices are novel and simple in their design, and enable improved accuracy and precise handling of encapsulated specimens with minimal labour and... |
| Tipo: Journal article |
Palavras-chave: Bead maker; Biosorption; Flow-cell; Sodium alginate. |
| Ano: 2008 |
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582008000400014 |
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| Franco,Luciana de Oliveira; Maia,Rita de Cássia C.; Porto,Ana Lúcia F.; Messias,Arminda Sacconi; Fukushima,Kazutaka; Campos-Takaki,Galba Maria de. |
| Chitin and chitosan were extracted from mycelial biomass of Cunninghamella elegans and the performance for copper, lead and iron biosorption in aqueous solution was evaluated. The growth curve of C. elegans was accomplished by determination of biomass, pH, glucose and nitrogen consumption. Chitin and chitosan were extracted by alkali-acid treatment and the yields were 23.8 and 7.8%, respectively. For the adsorption analysis, the process of heavy uptake metal sorption was evaluated using polysaccharides solutions (1% w/v). The rate of metallic biosorption was dependent upon the concentration and pH of metal solutions, and the best results were observed with pH 4.0. Chitosan showed the highest affinity for copper and chitin for iron adsorption. The results... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Cunninghamella elegans; Chitin; Chitosan; Bioremediation; Biosorption. |
| Ano: 2004 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1517-83822004000200013 |
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| Yucel,Tugba Tugrul. |
| ABSTRACT Dye stuff released to the ecosystem from textile industries cause a serious contamination and become a major environmental problem over the last few decades. As biological decolorization of textile wastewater is an important issue, Fusarium . acuminatum was used to removal of a frequently used textile dye, methyl orange. Live pellet of Fusarium acuminatum was used and decolorization studies performed in various temperatures and pH conditions with different dye concentrations. The highest decolorization rate was observed at 35ᴼC. 60 mg/L was found as the optimum initial dye concentration. In the pH range of 3-4, decolorization rate was approximately 70%. It was seen that Fusarium acuminatum have the great ability of the methyl orange removal. To... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Biosorption; Azo dye; Methyl orange; Fusarium acuminatum; Live pellet. |
| Ano: 2018 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132018000100419 |
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| Hellmann,Liliane; Schmitz,Ana P. de O.; Módenes,Aparecido N.; Hinterholz,Camila L.; Antoniolli,Camila de A.. |
| ABSTRACT In this work, the potential of peach pit biosorption in the removal of the drug metformin hydrochloride from water is evaluated. Experiments are carried out in a closed batch system to evaluate the effect of the solution pH (2–10), temperature (25, 35 and 45 °C), stirring (100, 150 and 200 rpm) and chemical treatments. During the study, biosorbent characterization, kinetic tests, equilibrium tests and thermodynamic parameter calculations are performed. The operating conditions that show the best results for both the raw biosorbent and the biosorbent submitted to acid, basic and acid followed by basic treatments with removal capacities of 3.17, 10.83, 18.10 and 49.14 mg g−1, respectively, are pH 7, 25 °C and 100 rpm, which result in an equilibrium... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Biosorption; Metformin hydrochloride; Peach pit; Kinetic modeling; Equilibrium modeling. |
| Ano: 2021 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-69162021000200181 |
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| Carmo,Juliana Ribeiro do; Pimenta,Carlos José; Silva,Júlia Ferreira da; Souza,Sara Maria Chaulfoun de. |
| The biosorption process, characterized by the use of biomass for removing metals from aqueous solutions, is an attractive technology using inactive and dead biomasses to remove heavy metals from aqueous solutions in the absence of metabolic activity necessary for intracellular accumulation. The desorption process, which concentrates the metal previously absorbed for possible reuse, is also important. The desorption of copper (Cu) (II) associated with the biomass of Cladosporium cladosporioides (Fres) de Vries was evaluated following the biosorption process (adsorption). Specifically, four eluents were used (all at a concentration 0.1 mol L-1), sulfuric acid, hydrochloric acid, ethylenediaminetetraacetate disodium and calcium chloride, as well as the... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Biosorption; Metal; Desorption. |
| Ano: 2013 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162013000300002 |
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| Nongmaithem,Nabakishor; Roy,Ayon; Bhattacharya,Prateek Madhab. |
| Abstract Fourteen Trichoderma isolates were evaluated for their tolerance to two heavy metals, nickel and cadmium. Three isolates, MT-4, UBT-18, and IBT-I, showed high levels of nickel tolerance, whereas MT-4, UBT-18, and IBT-II showed better tolerance of cadmium than the other isolates. Under nickel stress, biomass production increased up to a Ni concentration of 60 ppm in all strains but then decreased as the concentrations of nickel were further increased. Among the nickel-tolerant isolates, UBT-18 produced significantly higher biomass upon exposure to nickel (up to 150 ppm); however, the minimum concentration of nickel required to inhibit 50% of growth (MIC50) was highest in IBT-I. Among the cadmium-tolerant isolates, IBT-II showed both maximum biomass... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Heavy metals; Biosorption; Trichoderma; MIC50; Fungistasis. |
| Ano: 2016 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1517-83822016000200305 |
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| Registros recuperados: 22 | |
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