Biosorption characteristics of Aspergillus fumigatus in removal of cadmium from an aqueous solution (original) (raw)
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Biosorption of Cadmium (II) using Discarded Biomass of Aspergillus aculeatus DBF9
The cadmium (Cd) biosorption potential of Aspergillus aculeatus DBF9 biomass was investigated. Among different forms of biomass, air-dried one was found most suitable in Cd removal. Maximum Cd (II) biosorption takes place at initial solution pH 4.5 after 90 min. Air-dried 150 mg of cell mass of A. aculeatus can remove about 78% of Cd (II) from 10 ml of 300 mg/L Cd (II) solution. The adsorption kinetics of Cd was modeled with a pseudo-second order equation to correlate the experimental data. The equilibrium data fitted very well to a Langmuir isotherm model more than to the Freundlich isotherm model. Metal accumulation was confirmed with FTIR, EDAX, and SEM analysis. This indicates that biosorption of Cd in A. aculeatus mainly occurs through ion exchange. Metal absorption properties of A. aculeatus can be used in Cd removal from industrial effluents.
Aspergillus nidulans Biomass as Biosorbent for cadmium Removal: Effects of Treatment and pH
This work evaluated the potential of Aspergillus nidulans biomass in cadmium removal process. The biomass obtained by heat inactivation, and treated with formaldehyde was used to remove cadmium in aqueous solutions, at concentrations of 1mM, 2mM and 3mM, and at pH values of 4, 5 and 6. The results indicate that the isolated displays potential for metal removal. The efficiency depended of pH and treatment. The highest removal rates were obtained at pH 6.0 and with biomass submitted to heat inactivation. The results showed the possibility of application of the isolated biomass in cadmium remediation processes even in high concentrations.
The biosorption characteristics of Pb(II) and Cd(II) ions from aqueous solution using the macrofungus (Amanita rubescens) biomass were investigated as a function of pH, biomass dosage, contact time, and temperature. Langmuir, Freundlich and Dubinin-Radushkevich (D-R) models were applied to describe the biosorption isotherm of the metal ions by A. rubescens biomass. Langmuir model fitted the equilibrium data better than the Freundlich isotherm. The maximum biosorption capacity of A. rubescens for Pb(II) and Cd(II) was found to be 38.4 and 27.3 mg/g, respectively, at optimum conditions of pH 5.0, contact time of 30 min, biomass dosage of 4 g/L, and temperature of 20 • C. The metal ions were desorbed from A. rubescens using both 1 M HCl and 1 M HNO 3 . The recovery for both metal ions was found to be higher than 90%. The high stability of A. rubescens permitted ten times of adsorption-elution process along the studies without a decrease about 10% in recovery of both metal ions. The mean free energy values evaluated from the D-R model indicated that the biosorption of Pb(II) and Cd(II) onto A. rubescens biomass was taken place by chemical ion-exchange. The calculated thermodynamic parameters, G • , H • and S • showed that the biosorption of Pb(II) and Cd(II) ions onto A. rubescens biomass was feasible, spontaneous and exothermic under examined conditions. Experimental data were also tested in terms of biosorption kinetics using pseudo-first-order and pseudo-second-order kinetic models. The results showed that the biosorption processes of both Pb(II) and Cd(II) followed well pseudo-second-order kinetics. Based on all results, It can be also concluded that it can be evaluated as an alternative biosorbent to treatment wastewater containing Pb(II) and Cd(II) ions, since A. rubescens is low-cost biomass and has a considerable high biosorption capacity. .tr (M. Tuzen). steels, plastics, the glass industry. The lead contamination is also due to effluents of vehicular traffic and the mixing of roadside runoffs. The presence of Pb(II) in drinkable water is known to cause various types of serious health problems . Although the inorganic form of lead is a general metabolic poison and enzyme inhibitor, organic forms are even more poisonous . On the other hand, cadmium is also a dangerous pollutant originating from metal plating, metallurgical alloying, mining, ceramics and other industrial operations . Cadmium toxicity may be observed by a variety of syndromes and effects including renal dysfunction, hypertension, hepatic injury, lung damage and teratogenic effects .
Biosorption of Cadmium from Solution by Trapa nantas
2016
Biosorption of Cd(II) is an effective technology for the treatment of industrial wastewater. In the present research article, generation of activated carbon derived from fruit shell of Trapa nantas, followed by its characterization using modern techniques like FTIR SEM, XRD and TGA studies have been reported. Different physical properties such as Particle size, Bulk Density, Moisture content, Water Soluble Matter and Acid Soluble Matter were also determined. This newly obtained activated carbon has been tested to estimate its practical applicability for removal of Cd(II) from aqueous solution. Adsorption capacity of Trapa Nantas Fruit Shell Activated Carbon (TNFSAC) for Cd(II) abetment was investigated employing batch equilibration method.. The influence of pH, contact time, adsorbent doses and initial Cd(II) concentration have also been studied and reported. UV-Visible spectrophotometer was used to determine the concentration of aqueous Cd(II) during the experiments. The results re...
Journal of Chemistry, Pharmacy and Health Science, 2017
In this study, the effect of some physicochemical parameters on the bioremediation of cadmium (cd 2+) from aqueous solution using Adansonia digitata l. seed cake residue as biosorbent was evaluated. Dried fruits of Adansonia digitata L. were collected from the Department of Biological Sciences, Ahmadu Bello University, Zaria. The seeds were excised, washed with sterile distilled water, sun dried, powdered and defatted using n-hexane to give Adansonia digitata cake residue (ADCR) which was used as the biosorbent. Standard stock solution (30 mg/L) of Cadmium Nitrate Cd(NO 3) 2 was prepared by weighing 30mg of the salt and dissolving in 1L of deionized water this was further diluted for further study. Batch experiments were carried out to study the effect of pH, initial concentration of metal salts, dosage of biosorbent, and contact time. The experimental design was Cross Randomized Design (CRD) and One way Analysis of Variance (ANOVA) was used to determine significant difference among means of the various parameters measured. Duncan Multiple Range Test (DMRT) was used in separating means with different significant values. The level of significance was taken at p < 0.05. The results revealed that the biosorption efficiency increased significantly (p < 0.05) as pH increased from 2-10, initial concentration of metal salt increased from 5-30 mg/L, dosage of biosorbent increased from 50-200mg/L, and as contact time increased from 5-60 min. A maximum biosorption efficiency of 74.25% was observed at a dose of 200mg/L ADCR, initial concentration of metal ion of 30mg/L, pH of 7, and contact time of 60min. From this study Adansonia digitata L. seed could be considered as a potential, eco-friendly, low cost, biosorbent for the removal of Cd 2+ from aqueous solution.
Annals of Microbiology, 2014
The minimum inhibitory concentration (MIC) value of Aspergillus awamori for Cd(II) was 700 mg/l. A complete inhibition of biomass production was observed at 400 mg/l concentration of Cd(II). A significant deformation in Cd(II)stressed conidiophores and conidia was observed by Scanning electron microscopy (SEM) investigation. Quantification of Cd(II) was performed by EDX microanalysis. Transmission electron microscopy investigation (TEM) confirmed the involvement of extracellular adsorption, intracellular penetration through the cell wall and vacuolation. Cadmium(II) stress induced noticeable changes in the activities of polyphenol oxidase (PPO), glutathione reductase (GR) and peroxidase (POD), and in the concentrations of total antioxidants, soluble protein and thiols. High performance liquid chromatography analysis (HPLC) revealed that Cd(II) stress stimulated the production of oxalic acid. Maximum Cd(II) uptake capacity was achieved at pH 5.0, initial metal ion concentration 500 mg/l and biomass dosage 1 g/l. Maximum Cd(II) uptake capacity was reached after 6 h for live biomass and after 2 h for dead biomass. Fourier transform infrared spectroscopy (FTIR) results gave an indication on chelation between oxygen-, nitrogen-, phosphorus-and especially sulphur-containing ligands of biomass with metal ions. X-ray diffraction analysis (XRD) revealed the presence of CdSO 4. H 2 O by live and dead biomass. EDX confirmed the occurrence of sulphur, oxygen and Cd(II) on the cell wall.
Biosorption of cadmium, manganese, nickel, lead, and zinc ions by Aspergillus tamarii
In this paper, Cd 2+ , Mn 2+ , Ni 2+ , Pb 2+ , and Zn 2+ heavy metals ions adsorption properties of commercially obtained Aspergillus tamarii were investigated. The dead biomass was used with a batch system for experiments. The effect of the operating parameters, such as pH, temperature, agitation speed, contact time, initial metal concentration, and biomass dosage of aqueous solution containing Cd 2+ , Mn 2+ , Ni 2+ , Pb 2+ , and Zn 2+ was studied to find biosorption capacity. The optimum pH range for all heavy metal uptakes was 6.0. The experiments were carried out at different temperatures in the range of 20-50˚C and the maximum uptake was found to be at 25˚C. Heavy metal ion uptake increased with agitation speed until 150 rpm. After this agitation speed adsorption capacity slightly decreased. The adsorption equilibrium was obtained at 150 min contact time. At the optimal conditions, maximum uptake of Cd 2+ , Mn 2+ , Ni 2+ , Pb 2+ , and Zn 2+ was found to be 51. 69, 46.99, 58.74, 98.14, and 54.33%, respectively, by using 1.5 g biomass. The interaction between heavy metals and biomass was characterized by FTIR spectroscopy.
Batch Study of Cadmium Biosorption by Carbon Dioxide Enriched Aphanothece sp. Dried Biomass
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The conventional method for cadmium removal in aqueous solutions (1–100 mg/L) is ineffective and inefficient. Therefore, a batch biosorption reactor using a local freshwater microalga (originating from an urban lake, namely, Situ Rawa Kalong-Depok) as dried biosorbent was tested. Biosorbent made from three kinds of cyanobacterium Aphanothece sp. cultivars (A0, A8, and A15) were used to eliminate cadmium (Cd2+) ions in aqueous solution (1–7 mg/L). The biosorbents were harvested from a photobioreactor system enriched with carbon dioxide gas of 0.04% (atmospheric), 8%, and 15% under continuous light illumination of about 5700–6000 lux for 14 d of cultivation. Produced dried biosorbents had Brunauer–Emmet–Teller (BET) surface area ranges of 0.571–1.846 m2/g. Biosorption of Cd2+ was pH and concentration dependent. Sorption was spontaneous (ΔG = −8.39 to −10.88 kJ/mol), exothermic (ΔH = −41.85 to −49.16 kJ/mol), and decreased randomness (ΔS = −0.102 to −0.126 kJ/mol. K) on the interface b...
International Journal of Environmental Science and Technology, 2017
Cadmium as common inorganic toxicants is strongly phytotoxic, and its uptake has been well documented. In the present study, the ability of isolated fungal strains toward remediation of cadmium was studied through minimum inhibition concentration. Ninety-two Cadmuim tolerant fungal strains belong to different species were isolated from some contaminated site in Isfahan/Iran. Among different isolated fungi, Fusarium species were selected for further analysis. The majority of the isolates were able to tolerate up to 250 ppm concentration of Cd. In addition, cadmium biosorption of inoculated and noninoculated wheat with Fusarium species was measured in the laboratory experiments to determine the role of fungal partner in heavy metal biosorption by plants. Fungal cadmium adsorption conformed to the dry weight of fungal biomass. Among these isolates F. oxysporum, F. circinatum and some Fusarium sp. were found to be most significant in reducing Cd content, respectively, in the liquid media. Fusarium oxysporum exhibited the maximum fungal mass dry weight/Cd concentration (ppm) of 652/43 at 100 ppm of Cd. Pathogenicity tests were performed to determine the kind of Fusarium species parasitism behavior. The interaction between different Fusarium species and wheat seedlings was evaluated and reflected the higher uptake of Cd by wheat plants in interaction with some pathogenic Fusarium species but not all of them. Endophytic F. oxysporum showed a significant reduction in Cd absorption in wheat in comparison with the control. This indicated the potential of this isolate as biosorbent for removal of Cd and seeds inoculation for more efficient and practical purpose.