scholarly journals Modeling of Biosorption of Chromium by Immobilized Whole Cells of Aspergillus awamori NRRL 3112

2018 ◽  
Vol 1 (1) ◽  
pp. 33
Author(s):  
David K Daniel ◽  
Mahadavan Vaishnavi
Keyword(s):  
Industrial Effluents ◽  
Cell System ◽  
Chromium Concentration ◽  
Aspergillus Awamori ◽  
Nutritional Requirement ◽  
Operational Parameters ◽  
Whole Cells ◽  
Freundlich Isotherms ◽  
Pseudo Second Order ◽  
High Concentrations

The presence of chromium in high concentrations in industrial effluents is of major concern, being extremely toxic and non-biodegradable, thus persistent and harmful to the ecosystem. Using microorganisms for adsorption of heavy metals has emerged as a potential alternative over the conventional methods and is gaining significance due to its incontestable merits. Since fungi amass metals more than their nutritional requirement, the present study in investigation of efficiency of Aspergillus awamori NRRL 3112 biomass for sorption of chromium by means of development of an immobilised whole cell system is significant. The effect of operational parameters like initial chromium concentration, time, temperature and pH on chromium removal was studied and the efficient conditions for the process were established. Kinetics studies revealed that, the pseudo second order model was found to best represent the process with higher R2 values than others. The Langmuir and Freundlich isotherms were applied and the Langmuir isotherm was found to be the best fit. It was also established by means of thermodynamic analysis that the biosorption occurred chemically and the process was more feasible, spontaneous and efficient at lower temperatures.

scholarly journals Biosorption of Bromophenol Blue from Aqueous Solution Using Flamboyant (Delonix regia) Pod

2020 ◽  
pp. 32-50
Author(s):  
Ebenezer Olujimi Dada ◽  
Ilesanmi Ademola Ojo ◽  
Abass Olanrewaju Alade ◽  
Tinuade Jolaade Afolabi ◽  
Omotayo Sharafdeen Amuda ◽  
...  
Keyword(s):  
Kinetic Models ◽  
Freundlich Isotherm ◽  
Industrial Effluents ◽  
Isotherm Models ◽  
Bromophenol Blue ◽  
Batch Adsorption ◽  
First Order ◽  
Freundlich Isotherms ◽  
Pseudo Second Order ◽  
Pseudo First Order

Matured flamboyant pods (FBP) activated with ZnCl2 were used for batch adsorption of Bromophenol blue (BPB) dye under the effects of concentration (10-200 ppm), contact time (20-300 min), biosorbent dosage (20-120 mg) and particle size (300-850 µm). The data obtained were fitted to Langmuir and Freundlich isotherm models as well as pseudo-first-order (PFO), pseudo-second-order (PSO) and Elovich kinetic models. The highest adsorption capacity and removal efficiency of 7.5762 mg/g and 75.76%, respectively, were obtained under the effects of initial dye concentrations. The correlation coefficient (R2) for the Langmuir and Freundlich isotherms are in the range 0.9938-0.9979 and 0.9895-0.9953, respectively, while, R2, in the ranges 0.5931-0.815, 0.9962-1.000 and 0.8046-0.8828, were obtained for the PFO, PSO, and Elovich kinetic models, respectively. The order of fit of the kinetic models is PSO > Elovich > PFO. The study suggests flamboyant pod as promising biomass for the remediation of dye-bearing industrial effluents.

scholarly journals Removal of Cr(VI) from Aqueous Solutions Using Powder of Potato Peelings as a Low Cost Sorbent

2014 ◽  
Vol 2014 ◽  
pp. 1-7 ◽  
Author(s):  
Farai Mutongo ◽  
Olga Kuipa ◽  
Pardon K. Kuipa
Keyword(s):  
Hexavalent Chromium ◽  
Metal Ion ◽  
Potassium Dichromate ◽  
Low Cost ◽  
Complete Removal ◽  
Chromium Concentration ◽  
Freundlich Isotherms ◽  
Aqueous Effluents ◽  
Pseudo Second Order ◽  
Potato Peels

Potato peels which are a low cost, renewable agroindustry by-product were used for the removal of hexavalent chromium from aqueous effluents. Batch experiments were carried out with an artificial effluent comprising of potassium dichromate in deionised water. The effects of the initial hexavalent chromium concentration, dose of biosorbent, and removal kinetics were explored. An adsorbent dosage of 4 g/L was effective in complete removal of the metal ion, at pH 2.5, in 48 minutes. The kinetic process of Cr(VI) adsorption onto potato peel powder was tested by applying pseudo-first-order and pseudo-second-order models as well as the Elovich kinetic equation to correlate the experimental data and to determine the kinetic parameters. The adsorption data were correlated by the Langmuir and Freundlich isotherms. A maximum monolayer adsorption capacity of 3.28 mg/g was calculated using the Langmuir adsorption isotherm, suggesting a functional group limited adsorption process. The results confirmed that potato peels are an effective biosorbent for the removal of hexavalent chromium from effluent.

scholarly journals Defluoridation of groundwater using mechanochemically-activated clay soil

2018 ◽  
Vol 13 (3) ◽  
pp. 599-611
Author(s):  
Masindi E. Denga ◽  
Wilson M. Gitari ◽  
Anthony A. Izuagie ◽  
Segun A. Akinyemi
Keyword(s):  
Milling Time ◽  
Clay Soil ◽  
Fluoride Removal ◽  
Order Kinetic ◽  
Physicochemical Transformation ◽  
X Ray ◽  
Freundlich Isotherms ◽  
Peak Broadening ◽  
Pseudo Second Order ◽  
High Concentrations

Abstract High concentrations of fluoride in drinking water are reported to be hazardous to human health. This study was conducted to assess the efficiency of mechanochemically-activated aluminosilicate clay soil in removing fluoride from groundwater. The soil was subjected to physicochemical transformation through mechanochemical activation for different time intervals (5, 10, 15 and 30 min). The highest specific surface obtained was about 50 m2/g, with the sample activated for 30 minutes. Fourier Transform Infrared (FT-IR) analyses of samples showed an increase in absorbance by Si-O-H groups at 510 cm−1 with increasing milling time. X-ray diffraction (XRD) analyses revealed that, at 30 minutes milling time, peak broadening was intensified while reflection peak intensities decreased. X-ray fluorescence (XRF) spectrometry showed that silica and alumina were the major clay soil components. Using a dosage of 0.6 g/100 mL of activated clay, a maximum fluoride removal of 41% was achieved using the batch activated for 30 minutes on water spiked with 9 mg-F/L at pH 2.41. The adsorption data fitted both the Langmuir and Freundlich isotherms, but only the pseudo-second-order kinetic, showing chemisorption fluoride removal.

scholarly journals Adsorptive Removal of Cd, Cu, Ni and Mn from Environmental Samples Using Fe3O4-Zro2@APS Nanocomposite: Kinetic and Equilibrium Isotherm Studies

Molecules ◽  
2021 ◽  
Vol 26 (11) ◽  
pp. 3209
Author(s):  
Aphiwe Siyasanga Gugushe ◽  
Anele Mpupa ◽  
Tshimangadzo Saddam Munonde ◽  
Luthando Nyaba ◽  
Philiswa Nosizo Nomngongo
Keyword(s):  
Electron Microscopy ◽  
Magnetic Nanomaterials ◽  
Batch Mode ◽  
X Ray ◽  
Freundlich Isotherms ◽  
Adsorption Capacities ◽  
Transmission Electron ◽  
Equilibrium Data ◽  
Pseudo Second Order ◽  
Wastewater Samples

In this study, Fe3O4-ZrO2 functionalized with 3-aminopropyltriethoxysilane (Fe3O4-ZrO2@APS) nanocomposite was investigated as a nanoadsorbent for the removal of Cd(II), Cu(II), Mn (II) and Ni(II) ions from aqueous solution and real samples in batch mode systems. The prepared magnetic nanomaterials were characterized using X-ray powder diffraction (XRD), scanning electron microscopy/energy dispersion x-ray (SEM/EDX) Fourier transform infrared spectroscopy (FTIR) and transmission electron microscopy (TEM). Factors (such as adsorbent dose and sample pH) affecting the adsorption behavior of the removal process were studied using the response surface methodology. Under optimized condition, equilibrium data obtained were fitted into the Langmuir and Freundlich isotherms and the data fitted well with Langmuir isotherms. Langmuir adsorption capacities (mg/g) were found to be 113, 111, 128, and 123 mg/g for Cd, Cu, Ni and Mn, respectively. In addition, the adsorption kinetics was analyzed using five kinetic models, pseudo-first order, pseudo-second order, intraparticle diffusion and Boyd models. The adsorbent was successfully applied for removal of Cd(II), Cu(II), Mn (II) and Ni(II) ions in wastewater samples.

Synthesis, Characterization and Adsorption Studies of a Graphene Oxide/Polyacrylic Acid Nanocomposite Hydrogel

2021 ◽  
Vol 19 (9) ◽  
pp. 46-54
Author(s):  
Makarim A. Mahdi ◽  
Aymen A.R. Jawad ◽  
Aseel M. Aljeboree ◽  
Layth S. Jasim ◽  
Ayad F. Alkaim
Keyword(s):  
Industrial Effluents ◽  
Langmuir Model ◽  
Isotherm Models ◽  
Nanocomposite Hydrogel ◽  
Adsorption System ◽  
Order Model ◽  
Solution Ph ◽  
Freundlich Model ◽  
Dye Sorption ◽  
Pseudo Second Order

The AAc/GO nanocomposite hydrogel was successfully employed as a polymeric Nano sorbent of the removal efficiency of M G dye from the model. The complication of the mechanism of the adsorption system was completely exposed by examining how solution pH affects adsorption, Ionic strength isotherm models, kinetic models, and thermodynamics. The adsorption of the MG dye was greatly dependent on the solution pH. The Freundlich model has been demonstrated to be the most accurate in describing the MG dye sorption, whilst the Langmuir model was shown to be the least accurate. Additionally, these integrated mechanisms fit nicely within the framework of a pseudo-second-order model. Additionally, the contact time at equilibrium short (ten minutes) required to MG removes demonstrates the AAc/GO nanocomposite hydrogel can be considered an efficient and potentially useful adsorbent for MG removal from industrial effluents.

scholarly journals Comparative Study on the Adsorption of [AuCl4]– onto Salicylic Acid and Gallic Acid Modified Magnetite Particles

2018 ◽  
Vol 16 (3) ◽  
pp. 329 ◽  
Author(s):  
Maya Rahmayanti ◽  
Sri Juari Santosa ◽  
Sutarno Sutarno
Keyword(s):  
Salicylic Acid ◽  
Gallic Acid ◽  
Adsorption Process ◽  
Freundlich Isotherms ◽  
Precipitation Procedure ◽  
Initial Ph ◽  
Isotherm Adsorption ◽  
Pseudo Second Order ◽  
Magnetite Particles ◽  
Co Precipitation

Salicylic acid-modified magnetite (Mag-SA) and gallic acid-modified magnetite (Mag-GA) particles were prepared by co-precipitation procedure. Characterization results showed the interaction that occurs between the surface of magnetite with salicylic acid (Mag-SA) and gallic acid (Mag-GA) was through hydrogen bonding. Adsorption of [AuCl4]– onto Mag-SA and Mag-GA surfaces as a function of initial pH, contact time, and initial concentration of the [AuCl4]– solution were comparatively investigated. Result showed that the optimum adsorption of [AuCl4]– onto Mag-SA or Mag-GA was found at pH 3. The adsorption process were found to allow the pseudo-second order equation, both for Mag-SA and Mag-GA. The parameters in isotherm adsorption equations conformed to the Langmuir and Freundlich isotherms very well for Mag-GA, but for Mag-SA, only conformed to the Langmuir isotherm very well. The result of this study demonstrate that the ability Mag-GA to adsorb [AuCl4]– higher than Mag-SA.

scholarly journals Enhancing acidic dye adsorption by modified UiO-66

2020 ◽  
Vol 1 (2) ◽  
pp. 54-62
Author(s):  
Naser Al Amery ◽  
Hussein Rasool Abid ◽  
Shaobin Wang ◽  
Shaomin Liu
Keyword(s):  
Adsorption Process ◽  
Dye Adsorption ◽  
Batch Adsorption ◽  
First Order ◽  
Freundlich Isotherms ◽  
Adsorption Capacities ◽  
Pseudo Second Order ◽  
The Stability ◽  
Second Order Equations ◽  
Better Than

In this study, two improved versions of UiO-66 were successfully synthesised. Modified UiO-66 and UiO-66-Ce were characterised to confirm the integrity of the structure, the stability of functional groups on the surface and the thermal stability. Activated samples were used for removal harmful anionic dye (methyl orange) (MO) from wastewater. Batch adsorption process was relied to investigate the competition between those MOFs for removing MO from aqueous solution. Based on the results, at a higher initial concentration, the maximum MO uptake was achieved by UiO-66-Ce which was better than modified-UiO-66. They adsorbed 71.5 and 62.5 mg g-1 respectively. Langmuir and Freundlich isotherms were employed to simulate the experimental data. In addition, Pseudo first order and Pseudo second order equations were used to describe the dynamic behaviour of MO through the adsorption process. The high adsorption capacities on these adsorbents can make them promised adsorbents in industrial areas.

scholarly journals Kinetic and Thermodynamic Studies of Chromium (VI) Sorption by Pure and Carbonized Fluted Pumpkin waste biomass (Telfairia occidentalis Hook F.)

2012 ◽  
Vol 27 ◽  
pp. 11-18
Author(s):  
Timi Tarawou ◽  
Michael Horsfall
Keyword(s):  
Aqueous Solution ◽  
Rate Constants ◽  
Industrial Effluents ◽  
Second Order ◽  
Order Kinetic ◽  
Waste Biomass ◽  
Fluted Pumpkin ◽  
Chromium Vi ◽  
Telfairia Occidentalis ◽  
Pseudo Second Order

The adsorption of chromium (VI) ions from aqueous solution was studied using pure and carbonized fluted pumpkin waste biomass (FPWB). The kinetic data shows a pseudo-first-order mechanism with rate constants of 1.26 × 10-2 and 1.933 × 10-2 mg g-1 min-1 for the pure and carbonized FPWB, respectively. While the pseudo-second-order mechanism has rate constants of 0.93 × 10-1 and 1.33 × 10-1 mg g-1 min-1 for the pure and carbonized waste biomass respectively. The pseudo-second order kinetic model was found to be more suitable for describing the experimental data based on the correlation coefficient values (R2) of 0.9975 and 0.9994 obtained for pure waste biomass (PWB) and carbonized waste biomass (CWB), respectively. The results obtained from this study show that PWB and CWB have very high removal capacity for chromium (VI) from aqueous solution over a range of reaction conditions. Thus, fluted pumpkin waste biomass (Telfairia occidentalis Hook F) is a potential sorbent for the treatment of industrial effluents containing chromium (VI) contaminant.DOI: http://dx.doi.org/10.3126/jncs.v27i1.6436 J. Nepal Chem. Soc., Vol. 27, 2011 11-18Uploaded date: 16 July, 2012

scholarly journals Adsorption purification of waste water from chromium by ferrite manganese

2020 ◽  
Vol 168 ◽  
pp. 00026
Author(s):  
Liliia Frolova ◽  
Mykola Kharytonov ◽  
Iryna Klimkina ◽  
Oleksandr Kovrov ◽  
Andrii Koveria
Keyword(s):  
Adsorption Process ◽  
Uv Spectroscopy ◽  
Second Order ◽  
Waste Waters ◽  
Equilibrium Isotherms ◽  
X Ray ◽  
First Order ◽  
Freundlich Isotherms ◽  
Pseudo Second Order ◽  
Kinetics Of

Plasma method is used to synthesize manganese ferrite. The basic properties of ferrite are determined by IR spectroscopy, UV spectroscopy, X-ray phase analysis, vibration magnetometry. The paper shows that the use of magnetically controlled sorbent allows to purify waste waters from chromium (III). The process of adsorption of chromium cations (III) is investigated. The kinetics of the process is studied. To describe the equilibrium isotherms, the experimental data are analysed by the models of Langmuir, Freundlich isotherms. Pseudo-first order, pseudo-second-order, and Weber-Morris are used to elucidate the kinetic parameters and mechanism of the adsorption process. It has been established that the removal of Cr (III) cations is described by the pseudo-second order of the Langmuir reaction and mechanism.

Effect of organic compounds on nitrite accumulation during the nitrification process for coking wastewater

2010 ◽  
Vol 62 (9) ◽  
pp. 2096-2105 ◽  
Author(s):  
H. B. Li ◽  
H. B. Cao ◽  
Y. P. Li ◽  
Y. Zhang ◽  
H. R. Liu
Keyword(s):  
Organic Compounds ◽  
Ammonia Oxidation ◽  
Industrial Effluents ◽  
Reaction Rates ◽  
Inhibitory Effect ◽  
Nitrite Accumulation ◽  
Coking Wastewater ◽  
Batch Bioreactor ◽  
The Difference ◽  
High Concentrations

Coking wastewater is one of the most toxic industrial effluents since it contains high concentrations of ammonia and toxic organic compounds. Nitrification might be upset by the inhibitory effect of organic compounds during the biological treatment of the wastewater. In this study, shortcut nitrification was obtained in a sequencing batch bioreactor (SBR) and the inhibitory effect of organic compounds on the nitrification was examined when temperature was 30±1°C, pH was 7.0–8.5, and dissolved oxygen concentration was 2.0–3.0 mg L−1. The inhibitory effect of organic compounds was presumed to be one of the main factors to obtain satisfactory nitrite accumulation. The effect of organic compounds on nitrification was examined in the SBR with initial inhibitor concentrations ranging from 0 to 80 mg L−1, including phenol, pyrocatechol, resorcin, benzene, quinoline, pyridine and indole. The inhibitory effect became stronger with the increase in the concentration, and it was presumed to take place through a direct mechanism resulting from biological toxicity of the inhibitor itself. Furthermore, the inhibitory effect on ammonia oxidation was slighter than that on nitrite oxidation, and the nitrite accumulation ratio during the nitrification was determined by the difference between the reaction rates of above two processes.

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