scholarly journals Fixed-Bed Column Adsorption Studies of Lead (II) From Aqueous Solution Using Chitosan -G-Maleic Anhydride-G-Methacrylic Acidcopolymer

2020 ◽  
pp. 316-334
Keyword(s):  
Aqueous Solution ◽  
Maleic Anhydride ◽  
Metal Ion ◽  
Fixed Bed ◽  
Breakthrough Curves ◽  
Ion Concentration ◽  
Continuous Adsorption ◽  
Bed Height ◽  
Column Adsorption ◽  
Dynamics Models

The adsorption of Lead (II) from aqueous solution by chitosan-g-maleic anhydride-g-methacrylic acidcopolymer was investigated in fixed- bed column.The continuous adsorption varying the effect of flow rates, bed height and concentration and breakthrough curves was evaluated and it was also analyzed by dynamics models namely, Boharts and Adam, Thomas and Yoon and Nelson models at different conditions.The breakthrough data fitted well to Thomas and Yoon Nelson models with high correlation coefficient, R 2 is 0.9835. The highest bed capacity of chitosan-g-maleicanhydride-g-methacrylicacid adsorbent was obtained using 1 ml /min flow rate, 100 ppm inlet Pb metal ion concentration, and 3 cm bed height

Continuous biosorption of nickel from aqueous solution using Chrysanthemum indicum derived biochar in a fixed-bed column

2017 ◽  
Vol 76 (7) ◽  
pp. 1895-1906 ◽  
Author(s):  
Sowmya Vilvanathan ◽  
S. Shanthakumar
Keyword(s):  
Aqueous Solution ◽  
Metal Ion ◽  
Fixed Bed ◽  
Breakthrough Curves ◽  
Ion Concentration ◽  
Column Studies ◽  
Nickel Ion ◽  
Fixed Bed Column ◽  
Nickel Ions ◽  
Chrysanthemum Indicum

The biosorption capability of Chrysanthemum indicum to remove nickel ions from aqueous solution in a fixed-bed column was examined in this study. Native C. indicum flower waste was improved for its biosorptive potential by pyrolysis to obtain its biochar form and, thereby, both raw (CIF-R) and biochar (CIF-BC) forms of the flower were used for Ni(II) removal. Fixed bed column studies were conducted to examine the influence of bed height (1.0–3.0 cm), flow rate (1.0–5.0 mL min−1) and initial metal ion concentration (25–75 mg L−1). The breakthrough curves (Cout/Cin vs time) were modelled using different dynamic adsorption models, viz. Adams-Bohart, Thomas and Yoon-Nelson model. Interpretation of the data revealed a favorable correlation with the Thomas model with higher R2 values and closer model-predicted and experimental biosorption capacity values. The equilibrium uptake capacity of CIF-R and CIF-BC for Ni(II) were found to be 14.02 and 29.44 mg g−1, respectively. Further, the column was regenerated using HCl as eluent, to desorb the adsorbed Ni(II) ions. The experimental results implied and affirmed the suitability of the biosorbents for nickel ion biosorption with its nature being favorable, efficient, and environmentally friendly.

Mercury Sorption on Chitosan

2007 ◽  
Vol 20-21 ◽  
pp. 635-638 ◽  
Author(s):  
Karol Campos ◽  
Eric Guibal ◽  
Francisco Peirano ◽  
M. Ly ◽  
Holger Maldonado
Keyword(s):  
Particle Size ◽  
Metal Ion ◽  
Fixed Bed ◽  
Sorption Isotherms ◽  
Sorption Kinetics ◽  
Breakthrough Curves ◽  
Ion Concentration ◽  
Fixed Bed Reactor ◽  
Continuous Systems ◽  
Maximum Sorption

Mercury sorption on chitosan was investigated in batch and continuous systems. Chitosan sorption properties were determined through sorption isotherms. Langmuir and Freundlich equations were used for the modeling of isotherms at pH 5. In batch systems, maximum sorption capacities reached 550 mg Hg/g. Sorption kinetics have been studied as a function of sorbent particle size and stirring rate. Dynamic removal of mercury was tested in a fixed bed reactor investigating the following parameters: particle size, column size, flow velocity and metal ion concentration. Clark and Adams-Bohart models were evaluated for the simulation of breakthrough curves. This study shows that chitosan is an effective sorbent for the treatment and recovery of mercury from dilute effluents at near neutral pH.

Adsorptive removal of V(V) ions using clinoptilolite modified with polypyrrole and iron oxide nanoparticles in column studies

MRS Advances ◽  
2018 ◽  
Vol 3 (36) ◽  
pp. 2119-2127 ◽  
Author(s):  
NOMCEBO H. MTHOMBENI ◽  
SANDRINE MBAKOP ◽  
AOYI OCHIENG ◽  
MAURICE S. ONYANGO
Keyword(s):  
Electron Microscope ◽  
Iron Oxide ◽  
Iron Oxide Nanoparticles ◽  
Metal Ion ◽  
Fixed Bed ◽  
Breakthrough Curves ◽  
Ion Concentration ◽  
Oxide Nanoparticles ◽  
Column Studies ◽  
The Fourier Transform

AbstractClinoptilolite modified with polypyrrole and iron oxide nanoparticles (Cln-PPy-Fe3O4) nanocomposite as a potential adsorbent for V (V) ions was prepared via polymerization of pyrrole monomer using FeCl3 oxidant in aqueous medium in which clinoptilolite-Fe3O4 nanoparticles were suspended. The structure and morphology of the prepared adsorbent was analysed with the Fourier transform infrared (FTIR) spectrometer, field-emission scanning electron microscope (FE-SEM), energy dispersive X-ray spectroscopy (EDX) and high-resolution transmission electron microscope (HR-TEM). Column fixed bed studies were performed to test the ability of the adsorbent to remove V (V) ions from aqueous solution. Low values of adsorbent exhaustion rate (AER) and large bed volumes were observed at lower metal ion concentration, higher bed mass and lower flow rate for V(V) removal indicating good performance. The volume of treated water processed at breakthrough point were found to be 0.09; 0.63 and 1.26 L for bed mass of 1, 2.5; and 5 g, respectively. The Yoon–Nelson and Thomas models appropriately described the breakthrough curves.

scholarly journals Evaluating the performance of an eggshell-bagasse biosorption system in removing lead and cadmium from aqueous solutions

2021 ◽  
Author(s):  
◽  
Charlene Harripersadth
Keyword(s):  
Metal Ion ◽  
Kinetic Modelling ◽  
Agricultural Waste ◽  
Fixed Bed ◽  
Breakthrough Curves ◽  
Ion Concentration ◽  
Equilibrium Studies ◽  
Lead And Cadmium ◽  
Biosorption Process ◽  
Oxygen Atoms

In this research investigation, the simultaneous use of 2 biomaterials, sugarcane bagasse and eggshells, were applied as biosorbents in the treatment of metal laden effluent. Under the characterisation measurements investigated, it was found that carbon, calcium and oxygen atoms which constitute carboxylic and carbonate functional groups were prominent in eggshells, whereas for bagasse, it was carbon, hydrogen and oxygen atoms constituting hydroxyl and carbonyl groups. Batch studies were conducted to investigate the effect of fundamental process variables such as particle size (75 – 250 μm), initial metal ion concentration (40 – 240 mg/L), pH (2 – 7) and contact time (0 – 120 min). With respect to the equilibrium studies, the applicability of the Langmuir isotherm implied a monolayer formation of metal ions onto the surface of both biomaterials with the maximum amounts of Pb and Cd adsorbed based on 1 g of biosorbent being 277.8 and 13.62 mg/g for eggshells and 31.45 and 19.49 mg/g for bagasse, respectively. Moreover, kinetic modelling revealed that the process was well described by the pseudo – second order model for both Pb and Cd using eggshells and bagasse. Fixed bed studies were used to assess the dynamic adsorption behaviour of the eggshell – bagasse system using a lab – scale adsorption column of 2.3 cm in diameter and 30 cm in height. The effect of bed depth (4 – 12 cm) on 5 adsorbents (eggshells, bagasse, adsorbent A, adsorbent B and adsorbent C) in the removal of Pb were investigated. Adsorbents A, B and C were a combination of both eggshells and bagasse with adsorbent A constituting 75wt % bagasse and 25wt % eggshells, adsorbent B constituting 50wt % bagasse and 50wt % eggshells and adsorbent C constituting 25wt % bagasse and 75wt % eggshells. The column experiments highlighted an improvement in bed performance with an increase in bed depth resulting in greater mass transfer zones, breakthrough times and larger quantities of effluents treated. Two kinetic models (Thomas and Yoon–Nelson) were used to interpret the breakthrough curves where the data showed good fits to both models used. In determining the efficacy of the eggshell – bagasse biosorption system, adsorbent C was found to be most proficient in the removal of Pb with eggshells, adsorbent B, adsorbent A and bagasse following suit. The results from this investigation strongly suggest the plausible reuse of agricultural waste materials in the treatment of contaminated effluent through the biosorption process.

scholarly journals Removal of chromium and Iron using mixed adsorbent for synthetic and industrial samples in a continuous column reactor

YMER Digital ◽  
2022 ◽  
Vol 21 (01) ◽  
pp. 98-111
Author(s):  
Dr. Srinivas Tadepalli ◽  
◽  
Dr. K.S.R Murthy ◽  
Dr. P Suresh Kumar ◽  
Dr. Prasanthi Kumari Nunna ◽  
...  
Keyword(s):  
Metal Ion ◽  
Metal Removal ◽  
Heavy Metal Removal ◽  
Fixed Bed ◽  
Industrial Effluent ◽  
Ion Concentration ◽  
Flow Rates ◽  
Saturation Time ◽  
Bed Height ◽  
Synthetic Solution

he results of the experiments showed that bed weight, flow rate, and initial metal ion concentration all play a role in the removal of Cr (III) and Fe (II). The optimized break through curve was obtained at 36cm bed height and 10ml/min for chromium where 97.5 to 100% removal was observed at a saturation time of 500-600 min. With the increase in bed height from 12cm to 36cm, both the breakthrough and saturation times for Cr (III) increased. The break through time at 12cm, 24cm, 36cm and 10ml/min for Cr (III) were 70 min, 105 min, and 35 min respectively. The saturation time for Cr (III) at 12cm, 24cm, 36cm and 10ml/min were 460 min, 490 min, and 500 min respectively. Similarly, the break through time for Fe (II) at 12cm, 24cm, 36cm and 10ml/min were 70 min, 80 min, and 100 min respectively. At 12cm, 24cm, 36cm, and 10ml/min, the saturation time for Fe (III) was 340 minutes, 360 minutes, and 430 minutes, respectively. Overall in the column performance comparison between synthetic solution and industrial effluents for chromium, synthetic solution performance was more superior at fixed volumetric flow rates of 10 ml/min and bed heights ranging from 12 cm to 36 cm But the reverse trend was observed in case of fixed bed heights of 36 cm (150 g) and variation of volumetric flow rates from 10ml/min to 30ml/min which indicates that industrial effluent performance was superior when compared to synthetic solution for heavy metal removal.

scholarly journals Oxidized Renewable Materials for the Removal of Cobalt(II) and Copper(II) from Aqueous Solution Using in Batch and Fixed-Bed Column Adsorption

2020 ◽  
Vol 2020 ◽  
pp. 1-17 ◽  
Author(s):  
Josilene Aparecida Vieira Rodrigues ◽  
Luide Rodrigo Martins ◽  
Laís Milagres Furtado ◽  
Amália Luísa Pedrosa Xavier ◽  
Francine Tatiane Rezende de Almeida ◽  
...  
Keyword(s):  
Sugarcane Bagasse ◽  
Large Scale ◽  
Fixed Bed ◽  
Breakthrough Curves ◽  
Maximum Adsorption Capacity ◽  
Renewable Materials ◽  
Continuous Adsorption ◽  
Column Adsorption ◽  
Pseudo Second Order ◽  
Effective Use

Batch and continuous adsorption of Co2+ and Cu2+ from aqueous solutions by oxidized sugarcane bagasse (SBox) and oxidized cellulose (Cox) were investigated. The oxidation reaction of sugarcane bagasse and cellulose was made with a mixture of H3PO4‒NaNO2 to obtain SBox and Cox, with the introduction of high number of carboxylic acid functions, 4.5 and 4.8 mmol/g, respectively. The adsorption kinetics of Co2+ and Cu2+ on SBox and Cox were modeled using two models (pseudo-first-order and pseudo-second-order) and the rate-limiting step controlling the adsorption was evaluated by Boyd and intraparticle diffusion models. The Sips and Langmuir models better fitted the isotherms with values of maximum adsorption capacity Qmax of 0.68 and 0.37 mmol/g for Co2+ and 1.20 and 0.57 mmol/g for Cu2+ adsorption on Cox and SBox, respectively. The reuse of both spent adsorbents was evaluated. Adsorption of Cu2+ and Co2+ on SBox in continuous was evaluated using a 22 factorial design with spatial time and initial metal concentration as independent variables and Qmax and effective use of the bed as responses. The breakthrough curves were very well described by the Bohart–Adams original model and the Qmax values for Co2+ and Cu2+ were 0.22 and 0.55 mmol/g. SBox confirmed to be a promising biomaterial for application on a large scale.

scholarly journals Removal of Pb2+ Ions by ZSM-5/AC Composite in a Fixed-Bed Bench Scale System

2021 ◽  
Vol 2021 ◽  
pp. 1-8
Author(s):  
R. Lakshmipathy ◽  
G. L. Balaji ◽  
Iván Leandro Rodríguez Rico
Keyword(s):  
Activated Carbon ◽  
Flow Rate ◽  
Fixed Bed ◽  
Carbon Composite ◽  
Breakthrough Curves ◽  
Flow Rates ◽  
Initial Concentration ◽  
Continuous Adsorption ◽  
Bed Height ◽  
Na Ions

This investigation suggests the implementation of ZSM-5 activated carbon composite as a prolific adsorbent for the continuous elimination of Pb2+ ions from water. Continuous adsorption experiments were performed by varying three parameters such as process flow rate (2-6 mL min-1), bed height (2-6 cm), and initial concentration (250–750 mg L-1). The highest loading capacity of the fixed-bed 213.3 mg L-1 was achieved with optimal values of 2 mL min-1 of flow rate, bed height of 6 cm, and initial concentration of 750 mg L-1, respectively. The breakthrough curves and saturation points were found to appear quickly for increasing flow rates and initial concentration and vice versa for bed depth. The lower flow rates with higher bed depths have exhibited optimal performances of the fixed-bed column. The mechanism of adsorption of Pb2+ ions was found to be ion exchange with Na+ ions from ZMS-5 and pore adsorption onto activated carbon. The breakthrough curves were verified with three well-known mathematical models such as the Adams-Bohart, Thomas, and Yoon-Nelson models. The later models showed the best fit to the column data over the Adams-Bohart model that can be utilized to understand the binding of Pb2+ ions onto the composite. Regeneration of ZSM-5/activated carbon was achieved successfully with 0.1 M HCl within 60 min of contact time. The outcomes conclude that ZSM-5 activated carbon composite is a prolific material for the continuous removal of water loaded with Pb2+ ions.

Investigations on the Fixed-Bed Column Performance of Acid Brown 75 Adsorption by Surface Modified Fly Ash Granules

2014 ◽  
Vol 931-932 ◽  
pp. 241-245
Author(s):  
Chayada Pansuk ◽  
Soydoa Vinitnantharat
Keyword(s):  
Aqueous Solution ◽  
Fly Ash ◽  
Fixed Bed ◽  
Breakthrough Curves ◽  
Characteristic Parameters ◽  
Feed Concentration ◽  
Fixed Bed Column ◽  
Bed Height ◽  
Lignite Fly Ash ◽  
Surface Modified

Adsorption potential of surface modified granule (SM-G) to remove acid brown 75 (AB 75) from aqueous solution was investigated using fixed-bed column mode. To produce SMG, lignite fly ash was agglomerated into porous granules by an extruder at 800°C and surfacemodified with a cationic surfactant, Hexadecyltrimetylammonium Bromide (HDTMABr). The performance of the fixed-bed column was evaluated to assess the effect of various process variables, viz., of bed height, flow rate and initial feed concentration on breakthrough time and adsorption capacity. The bed depth service time (BDST) model was applied to the data for predicting breakthrough curves and to determine the characteristic parameters. The highest experimental and theoretical bed capacities were obtained to be 55.3 mg of AB 75 adsorbed per gram of SM-G. The results indicated that the SM-G is a suitable adsorbent for the removal of AB 75 from aqueous solution.

scholarly journals Valorization of granulated slag of Arcelor-Mittal (Algeria) in cationic dye adsorption from aqueous solution: column studies

2015 ◽  
Vol 6 (1) ◽  
pp. 204-213
Author(s):  
Radia Mazouz ◽  
Naima Filali ◽  
Zhour Hattab ◽  
Kamel Guerfi
Keyword(s):  
Aqueous Solution ◽  
Fixed Bed ◽  
Dye Adsorption ◽  
Characteristic Parameters ◽  
Column Studies ◽  
Fixed Bed Column ◽  
Continuous Adsorption ◽  
Bed Height ◽  
Granulated Slag ◽  
Good Agreement

A continuous adsorption study in a fixed-bed column was carried out using granulated slag (GS) as an adsorbent for the removal of methylene blue (MB) from aqueous solution. The effects of various parameters, such as initial dye concentration, flow rate, bed depth, and pH were investigated. Obtained results confirmed that the breakthrough time and exhaustion time were dependent on these factors. The adsorption capacity of GS was calculated at the 50% breakthrough point for different conditions. The highest breakthrough capacity (q,exp = 0.296 mg.g–1) was obtained with a 15 cm bed height and a 2 mL.min–1 rate by using a 10 mg.L–1 initial MB concentration at pH 7.5. Bohart–Adams, Bed Depth Service Time (BDST), and Thomas models were applied to experimental data to determine the characteristic parameters of the column. The Thomas model was found suitable for the description of the whole breakthrough curve, while the Bohart–Adams model was only used to predict the initial part of the dynamic process. The data were in good agreement with the BDST model. Thus, the granulated slag can be used as an adsorbent in the treatment of wastewater. Desorption was carried out with a deionized water as the desorbing agent, and reuse study was investigated.

scholarly journals Penerapan kolom adsorpsi seri dengan adsorben sekam padi pada penyisihan logam seng (Zn) dari air tanah

2021 ◽  
Vol 12 (1) ◽  
pp. 19-26
Author(s):  
Shinta Indah ◽  
Denny Helard ◽  
Dian Ramadhan
Keyword(s):  
Rice Husk ◽  
Fixed Bed ◽  
Column Height ◽  
Rice Husks ◽  
Fixed Bed Column ◽  
Continuous Adsorption ◽  
Bed Height ◽  
Column Adsorption ◽  
In Series ◽  
Original Size

To increase the performance of continuous adsorption with rice husks as adsorbent in Zn removal from groundwater, a series of fixed bed column was applied. The experiments were carried out at the acrylic columns having diameter of 7 cm, column height of 19.5 cm, bed height of 13.5 cm and flow rate of 2 gpm/ft2 (310 mL/minute) for 540 minutes. The number of columns used were 3 columns arranged in series and the rice husk used were in their original size (1-2 mm). The influent concentration of Zn metal was 7.62 mg/L. The results showed that the use of column adsorption in series increased the removal efficiency of Zn by rice husks, from 33.21% using 1 column to 51.70% with 3 columns. The adsorption capacity of Zn obtained when using 3 columns in series was 3.542 mg/g. In addition, the use of adsorption columns in series can also prolong the saturation of the adsorbent, thereby extending its service life. The overall research results demonstrated that column the adsorption in series with rice husk as an adsorbent has the potential to be applied to remove heavy metals from groundwater.

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