scholarly journals Biosorption of Cr(VI) from Aqueous Solutions UsingTrametes Versicolor PolyporusFungi

2008 ◽  
Vol 5 (3) ◽  
pp. 499-510 ◽  
Author(s):  
M. Venkata Subbaiah ◽  
S. Kalyani ◽  
G. Sankara Reddy ◽  
Veera M. Boddu ◽  
A. Krishnaiah
Keyword(s):  
Trametes Versicolor ◽  
Isotherm Models ◽  
Model Parameters ◽  
Kinetics Of Adsorption ◽  
Chromium Vi ◽  
Adsorption Isotherm Models ◽  
Adsorption Data ◽  
Naoh Solution ◽  
Sorption Parameters ◽  
Kinetics Of

Removal of chromium(VI) from aqueous solution was studied using abundantly availabletrametes versicolor polyporusfungi as biosorbing medium under equilibrium and column flow conditions. Various sorption parameters such as contact time, effect of pH, concentration of Cr(VI) and amount of biomass on the adsorption capacity of the biosorbent were studied. The equilibrium adsorption data were fitted to Freundlich and Langmuir adsorption isotherm models and the model parameters are evaluated. In addition, the data were used to predict the kinetics of adsorption. The results indicated that the adsorption of Cr(VI) on fungi followed second order kinetics. The column flow adsorption data were used to predict break through curves. The fungi loaded with Cr(VI) was regenerated with 0.1 M NaOH solution and the regenerated biomass was used in the subsequent adsorptiondesorption cycles. The experimental results demonstrated that thetrametes versicolor polyporusfungi could be used as sorbent for immobilizing Cr(VI).

scholarly journals Removal of Chromium (VI) from Aqueous Solution using Charred Pomegranate Waste

2013 ◽  
Vol 29 ◽  
pp. 81-88
Author(s):  
Rajendra Prasad Gautam ◽  
Megh Raj Pokhrel
Keyword(s):  
Aqueous Solution ◽  
Adsorption Isotherm ◽  
Low Cost ◽  
Chemical Society ◽  
Isotherm Models ◽  
Model Parameters ◽  
Chromium Vi ◽  
Fruit Waste ◽  
Sorption Parameters ◽  
Pomegranate Fruit

Removal of Cr(VI) from aqueous solution was studied using charred pomegranate fruit waste [CPW] as a new low cost biosorbent under batch method at room temperature. Its efficiency for removal of Cr(VI) was compared with raw pomegranate fruit waste[RPW]. Various sorption parameters such as contact time, initial concentration of Cr(VI) ion and effect of pH on the adsorption capacity of the biosorbent were studied. The adsorbent was effective for quantitative removal of Cr(VI) ions in highly acidic condition (pH=1) and equilibrium has been achieved in 2 hours. The adsorption isotherm data were fitted to Langmuir and Freundlich adsorption isotherm models and the model parameters were evaluated. Spectrophotometric method using diphenylcarbazide as a complexing reagent was used to analyze the chromium content in synthetic samples and the landfill site effluent collected from Kuleshwor, Kathmandu, Nepal.DOI: http://dx.doi.org/10.3126/jncs.v29i0.9256Journal of Nepal Chemical Society Vol. 29, 2012 Page:  81-88 Uploaded date: 12/5/2013 

scholarly journals Modified/Unmodified Nanoparticle Adsorbents of Cellulose Origin With High Adsorptive Potential for Removal of Pb(II) From Aqueous Solution

2017 ◽  
Vol 13 (27) ◽  
pp. 425
Author(s):  
Azeh Yakubu ◽  
Gabriel Ademola Olatunji ◽  
Folahan Amoo Adekola
Keyword(s):  
Aqueous Solution ◽  
Adsorption Capacity ◽  
Contact Time ◽  
Adsorption Process ◽  
Correlation Coefficients ◽  
Solution Temperature ◽  
Isotherm Models ◽  
Maximum Adsorption Capacity ◽  
Kinetics Of Adsorption ◽  
Kinetics Of

This investigation was conducted to evaluate the adsorption capacity of nanoparticles of cellulose origin. Nanoparticles were synthesized by acid hydrolysis of microcrystalline cellulose/cellulose acetate using 64% H3PO4 and characterized using FTIR, XRD, TGA-DTGA, BET and SEM analysis. Adsorption kinetics of Pb (II) ions in aqueous solution was investigated and the effect of initial concentration, pH, time, adsorbent dosage and solution temperature. The results showed that adsorption increased with increasing concentration with removal efficiencies of 60% and 92.99% for Azeh2 and Azeh10 respectively for initial lead concentration of 3 mg/g. The effects of contact time showed that adsorption maximum was attained within 24h of contact time. The maximum adsorption capacity and removal efficiency were achieved at pH6. Small dose of adsorbent had better performance. The kinetics of adsorption was best described by the pseudo-second-Order model while the adsorption mechanism was chemisorption and pore diffusion based on intra-particle diffusion model. The isotherm model was Freundlich. Though, all tested isotherm models relatively showed good correlation coefficients ranging from 0.969-1.000. The adsorption process was exothermic for Azeh-TDI, with a negative value of -12.812 X 103 KJ/mol. This indicates that the adsorption process for Pb by Azeh-TDI was spontaneous. Adsorption by Azeh2 was endothermic in nature.

scholarly journals Influence of Salinity on the Removal of Ni and Zn by Phosphate-Intercalated Nano Montmorillonite (PINM)

Minerals ◽  
2020 ◽  
Vol 10 (11) ◽  
pp. 980
Author(s):  
Jiyeon Choi ◽  
Ardie Septian ◽  
Won Sik Shin
Keyword(s):  
Langmuir Model ◽  
Permeable Reactive Barrier ◽  
Isotherm Models ◽  
Binary Adsorption ◽  
Adsorption Parameters ◽  
Ideal Adsorbed Solution Theory ◽  
Adsorption Isotherm Models ◽  
Adsorption Data ◽  
Best Fitting ◽  
P Factor

The salinity influence on the adsorptions of Ni and Zn onto phosphate-intercalated nano montmorillonite (PINM) were investigated. Single adsorption isotherm models fitted the single adsorption data well. The adsorption capacity of Ni was higher than that of Zn onto PINM at different salinities. The single adsorption parameters from Langmuir model (QmL and bL) were compared with the binary adsorption (QmL* and bL*). The QmL* of Zn was lower than that of Ni. The simultaneous presence of Ni and Zn decreased the adsorption capacities. The single and binary adsorptions onto PINM were affected by the salinity. The competitive Langmuir model (CLM), P-factor, Murali and Aylmore (M−A) models, and ideal adsorbed solution theory (IAST) were satisfactory in predicting the binary adsorption data; the CLM showed the best fitting results. Our results showed that the PINM can be used as an active Ni and Zn adsorbent for a permeable reactive barrier (PRB) in the remediation of saline groundwater.

Kinetics Of Adsorption Of Proteins From Human Plasma Onto Foreign Surfaces

1981 ◽  
Author(s):  
J L Brash ◽  
S Uniyal
Keyword(s):  
Human Plasma ◽  
Surface Concentration ◽  
Kinetics Of Adsorption ◽  
Hydrophilic Surfaces ◽  
Adsorption Data ◽  
First Occurrence ◽  
Foreign Surface ◽  
Kinetics Of ◽  
Hydrophilic Materials ◽  
Zero Time

It is believed that adsorption of proteins is the first occurrence after blood/foreign surface contact. The composition of the protein layer, how it depends on surface properties, and how it changes with time are essentially unknown. The objective of this work was to develop data relevant to these questions. To this end, the quantities of �albumin, fibrinogen and IgG adsorbed on seven surfaces from human plasma as a function of time were measured. Human plasma (ACD anticoagulant) was diluted 1:4 with tris buffer. Purified proteins were labelled with iodine isotopes using the IC1 method and added to the plasma as tracers. Materials studied include several segmented polyether-urethanes, both hydrophilic and hydrophobic, glass, siliconized glass (SG), polystyrene (PS) and polyethylene (PE).The results may be summarized as follows: Fibrinogen: Within the 2 min to 3 h range of contact times, fibrinogen was not detected on any of the hydrophilic surfaces. On PE and SG the quantity adsorbed passed through a maximum between zero time and 2 min, then declined to near zero. Only on PS was adsorption substantial (0.4 μg cm-2) and constant with time, similar to that from a solution of fibrinogen. Albumin: Albumin was also not detected on the hydrophilic materials. In general its surface concentration when it was adsorbed (hydrophobic surfaces) was similar to that observed for solutions of albumin. IgG: IgG was detected on all surfaces. The surface concentrations were low (about 0.1 μg cm-2) compared to solution values but were generally constant with time.The following conclusions are drawn: (1) The plasma itself modifies adsorption. Therefore solution adsorption data cannot be used to predict plasma adsorption. (2) Contrary to popular belief, fibrinogen is absent or transient on most surfaces. (3) IgG appears to be ubiquitous as a component of protein layers adsorbed from Plasma.

scholarly journals Statistical analysis on the removal of malachite green dye using active carbons of Achyranthes aspera and Allamanda blanchetii plants

2019 ◽  
Vol 14 (4) ◽  
pp. 808-824
Author(s):  
Sujitha Ravulapalli ◽  
Ravindhranath Kunta
Keyword(s):  
Malachite Green ◽  
Activated Carbons ◽  
Industrial Effluent ◽  
Isotherm Models ◽  
Active Carbons ◽  
Kinetics Of Adsorption ◽  
Achyranthes Aspera ◽  
Malachite Green Dye ◽  
Pseudo Second Order ◽  
Kinetics Of

Abstract Activated carbons were prepared from the stem parts of Achyranthes aspera and Allamanda blanchetii plants and were investigated as adsorbents for the removal of malachite green dye from contaminated water. Various extraction conditions such as pH, initial concentration of dye, adsorbent dosage, temperature, agitation time and presence of co-ions were optimized for the maximum possible extraction of the dye. For analyzing the combined effect of these parameters on the removal efficiency of the adsorbents, statistical optimization modelling was adopted. The adsorbents developed were characterized and the adsorption abilities were observed to be 40.0 mg/g and 53.0 mg/g for the active carbons of Achyranthes aspera and Allamanda blanchetii plants respectively. The mechanism of adsorption was studied using various isotherm models and it was found that the Freundlich model describes well the adsorption process. Thermodynamic studies revealed the endothermic and spontaneous nature of physisorption. The kinetics of adsorption were well defined by the pseudo-second-order model. Desorption and regeneration studies of the spent adsorbents indicated that the percentage of extraction has not come down below 80.0% even after five regenerations for both the adsorbents. The validity of the methods developed are tested with real dye-polluted industrial effluent samples.

Thermodynamic Studies for Adsorption of Cd2+ and Pb2+ from Waster Water on Modified Walnut Shell

2015 ◽  
Vol 737 ◽  
pp. 622-626
Author(s):  
Shao Hua He ◽  
Dan Wang ◽  
Qing Qiu Kong ◽  
Xi Wu
Keyword(s):  
Freundlich Isotherm ◽  
Isotherm Model ◽  
Walnut Shell ◽  
Isotherm Models ◽  
Model Parameters ◽  
Maximum Adsorption Capacity ◽  
Adsorption Data ◽  
Batch Technique ◽  
Adsorption Processes ◽  
Langmuir Isotherm Model

The adsorption isothermal curve and thermodynamic adsorption of Cd2+ and Pb2+ on modified walnut shell from waster water were investigated using batch technique. The equilibrium adsorption data are fitted to Langmuir and Freundlich isotherm models and the model parameters are evaluated. The Langmuir isotherm model shows a better fit to adsorption data than the Freundlich isotherm model for the sorption of Cd2+ and Pb2+ on modified walnut shell. The maximum adsorption capacity of Cd2+ and Pb2+ by modified walnut shell is found to be 32.68 mg·g-1 and 84.75 mg·g-1 at 298K temperature, respectively. The adsorption processes of Cd2+ and Pb2+ has feasibility and spontaneous nature. Thermodynamic parameters depict the endothermic nature of sorption and the process is spontaneous and favorable.

scholarly journals Enhanced removal of chromium (VI) from wastewater using active carbon derived from Lantana camara plant as adsorbent

2018 ◽  
Vol 78 (6) ◽  
pp. 1377-1389 ◽  
Author(s):  
Sujitha Ravulapalli ◽  
Ravindhranath Kunta
Keyword(s):  
Adsorption Capacity ◽  
Active Carbon ◽  
Lantana Camara ◽  
Polluted Water ◽  
Isotherm Models ◽  
Equilibration Time ◽  
Kinetics Of Adsorption ◽  
Chromium Vi ◽  
Ir Studies ◽  
Pseudo Second Order

Abstract Activate carbon prepared from the stems of Lantana camara plant (ACSLC) is investigated as adsorbent for the removal of chromium (Cr) (VI) from polluted water using batch methods of extraction. Various extraction conditions such as pH, initial concentration of Cr (VI), sorbent dosage, temperature, equilibration time and presence of co-ions are optimized. The adsorption capacity is found to be 26.25 mg/g and is more than hitherto reported sorbents in the literature. The spent adsorbent can be regenerated and reused with a marginal reduction in its adsorption capacity. The active carbon is characterized by field emission scanning electron microscope (FESEM), X-ray diffraction (XRD) and Fourier-transform infrared (FT-IR) studies. The sorption mechanism is investigated using various isotherm models and found that the Freundlich model describes the adsorption process well. Thermodynamic studies reveal the endothermic and spontaneous nature of physisorption. The kinetics of adsorption is well defined by the pseudo-second-order model. The methodology developed is successfully applied to effluent samples collected at various industries.

scholarly journals Hierarchical approach towards adsorptive removal of Alizarin Red S dye using native chitosan and its successively modified versions

2020 ◽  
Vol 82 (4) ◽  
pp. 715-731
Author(s):  
M. A. Khapre ◽  
R. M. Jugade
Keyword(s):  
Alizarin Red S ◽  
Point Of Zero Charge ◽  
Isotherm Models ◽  
X Ray Diffraction ◽  
Adsorption Method ◽  
Alizarin Red ◽  
Kinetics Of Adsorption ◽  
X Ray ◽  
Column Adsorption ◽  
Adsorption Isotherm Models

Abstract In the present work, native chitosan (Ch) along with its chemically and physico-chemically modified versions, namely sulphate cross-linked chitosan (SCC) and sulphate cross-linked chitosan–bentonite composite (SCC-B), were employed as potential adsorbents for the removal of an anionic dye, Alizarin Red S (ARS) from aqueous solutions. All three adsorbents were extensively characterized using techniques such as Fourier-transform infrared spectroscopy, scanning electron microscopy, energy dispersive X-ray, X-ray diffraction, Brunauer–Emmett–Teller analysis, thermogravimetric–differential thermal analysis, and pH point of zero charge. Various parameters were optimized, including pH of dye solution, contact time, adsorbent dose, initial adsorbate concentration and temperature of adsorption. Four adsorption isotherm models were studied and it was found that the Freundlich model was best-fit for all three systems. Maximum adsorption capacities towards adsorption of ARS were found to be 42.48, 109.12 and 131.58 mg g−1 for Ch, SCC and SCC-B, respectively. Kinetics of adsorption was examined by employing three well-known models in order to deduce the mechanism of adsorption. Thermodynamic studies show that the process is spontaneous and exothermic for all adsorbents employed. Furthermore, it was observed that for large sample volumes, the column adsorption method was more effective compared to the batch method.

scholarly journals Calcium Alginate Beads Doped with Nano-ZrO2 and Activated Carbon of Annona reticulate Plant as an Effective Adsorbent for Water Remediation of Chromium(VI)

2021 ◽  
Vol 33 (2) ◽  
pp. 281-290
Author(s):  
WONDWOSEN KEBEDE BIFTU ◽  
KUNTA RAVINDHRANATH
Keyword(s):  
Activated Carbon ◽  
Calcium Alginate ◽  
Alginate Beads ◽  
Water Remediation ◽  
Polluted Water ◽  
Isotherm Models ◽  
Kinetics Of Adsorption ◽  
Calcium Alginate Beads ◽  
Chromium Vi ◽  
Pseudo Second Order

An activated carbon produced from stems of Annona reticulate plant (SACAR) by conc. H2SO4 digestion, is observed to have strong affinity for toxic Cr(VI) ions. Its adsorptivity for Cr(VI) ions was enhanced by admixing it with ‘nano-ZrO2’ (Zr-SACAR)-synthesized adopting green methods. For ensuring easy filtration, the ‘active carbon + nanoparticle composite’ was immobilized in calcium alginate beads (Zr-SACAR-Ca). Optimum extraction conditions for these three adsorbents for the removal of Cr(VI) ions from water were investigated. The adsorption capacities were found to be 92.2 mg/g for SACAR; 109.83 mg/g for Zr-SACAR and 119.34 mg/g for Zr-SACAR-Ca. The sorption nature was characterized by XRD, FTIR, FESEM and EDX studies. The sorption mechanism was investigated using various isotherm models. Thermodynamic studies revealed the endothermic and spontaneous nature of sorption. The kinetics of adsorption was well defined by the pseudo-second-order model. The spent adsorbent are regenerated and reused until six cycles with marginal decrease in Cr-adsorptivity. The adsorbents developed are effectively applied in the treatment of polluted water samples collected from Ethiopia

scholarly journals Zeolites in Phenol Removal in the Presence of Cu(II) Ions—Comparison of Sorption Properties after Chitosan Modification

Materials ◽  
2020 ◽  
Vol 13 (3) ◽  
pp. 643 ◽  
Author(s):  
Lidia Bandura ◽  
Małgorzata Franus ◽  
Jarosław Madej ◽  
Dorota Kołodyńska ◽  
Zbigniew Hubicki
Keyword(s):  
Nitrogen Adsorption ◽  
Isotherm Models ◽  
Phenol Removal ◽  
Experimental Conditions ◽  
Kinetics Of Adsorption ◽  
Initial Concentration ◽  
Pseudo Second Order ◽  
Ft Ir ◽  
Adsorption Desorption ◽  
Kinetics Of

Nowadays, the contamination of water with phenol is a serious environmental problem. This compound occurs very often with heavy metal ions which makes purification of water even more difficult. This article presents the problem of the removal of phenol from aqueous solutions in the presence of Cu(II) ions on synthetic zeolite NaP1 and zeolite NaP1 modified with chitosan. The adsorbents were determined with the use of Fourier transform infrared spectroscopy (FT-IR), nitrogen adsorption/desorption isotherm, and scanning electron microscopy (SEM). The studies on isotherms and batch kinetics under diversified experimental conditions with respect to initial concentration, contact time, and pH were discussed. Both Cu(II) and phenol adsorption increases with the initial concentration. Different isotherm models correspond well with the data acquired through experiments. The kinetics of adsorption follows the pseudo-second order rate equation. The studies indicate that the obtained sorbents can be employed for efficient removal of phenol from wastewater in the presence of Cu(II) ions.

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