Adsorption of Cr(VI) from Aqueous Solution onto Lab-Made Mesopore Activated Carbon

2013 ◽  
Vol 295-298 ◽  
pp. 1161-1167
Author(s):  
Ming Xia Fan ◽  
Kun Wang ◽  
Ya Zhou Wang ◽  
Dan Qing Yu
Keyword(s):  
Aqueous Solution ◽  
Activated Carbon ◽  
Kinetic Data ◽  
Low Ph ◽  
Order Equation ◽  
Adsorption Kinetic ◽  
Operating Parameters ◽  
Solution Ph ◽  
Equilibrium Data ◽  
Pseudo Second Order

In the present investigation, lab-made mesoporous activated carbon (MAC) was prepared for testing the ability to remove Cr(VI) from aqueous solution. The influences of several operating parameters such as pH and temperature on the adsorption were investigated. Solution pH is found highly influencing the adsorption and low pH is favorable for Cr(VI) adsorption. The adsorption of Cr(VI) is enhanced with increased temperature. Thermodynamic parameters were evaluated and the adsorption was endothermic. Several adsorption isotherms include Langmuir, Freundlich and Dubinin–Radushkevich(D–R) were used to fit the equilibrium data. The adsorption kinetic data of Cr(VI) were analyzed and was found fitting well in pseudo-second order equation. The lab-made MAC is found to be effective adsorbent for removal of Cr(VI) from aqueous solutions.

scholarly journals Dye removal from aqueous solution by raw maize corncob and H3PO4 activated maize corncob

2017 ◽  
Vol 8 (2) ◽  
pp. 214-224 ◽  
Author(s):  
M. Farnane ◽  
H. Tounsadi ◽  
A. Machrouhi ◽  
A. Elhalil ◽  
F. Z. Mahjoubi ◽  
...  
Keyword(s):  
Aqueous Solution ◽  
Order Kinetic ◽  
Solution Ph ◽  
Adsorption Performance ◽  
Adsorption Capacities ◽  
Monolayer Adsorption ◽  
Equilibrium Data ◽  
Order Kinetic Model ◽  
Pseudo Second Order ◽  
Best Fit

AbstractThe focus of this study is the investigation of removal ability of methylene blue (MB) and malachite green (MG) dyes from aqueous solution by raw maize corncob (RMC) and H3PO4 activated maize corncob (AMC). Maize corncobs were carbonized at 500 °C for 2 h, and then impregnated at a phosphoric acid to maize corncob ratio of 2.5 g/g. The impregnated maize corncob was activated in a tubular vertical furnace at 450 °C for 2 h. Samples were characterized by different methods. Adsorption experiments were carried out as a function of solution pH, adsorbent dosage, contact time, initial concentration of dyes and the temperature. Experimental results show that the activation of maize corncob boosts four times the adsorption performance for the selected dyes. The adsorption process is very rapid and was pH dependent with high adsorption capacities in the basic range. The kinetic data were fitted with the pseudo-second-order kinetic model. The best fit of equilibrium data was obtained by the Langmuir model with maximum monolayer adsorption capacities of 75.27 and 271.19 mg/g for MB, 76.42 and 313.63 mg/g for MG, respectively, in the case of RMC and AMC. The temperature did not have much influence on the adsorption performance.

Adsorption of leather dye onto activated carbon prepared from bottle gourd: equilibrium, kinetic and mechanism studies

2013 ◽  
Vol 67 (1) ◽  
pp. 201-209 ◽  
Author(s):  
Edson Luiz Foletto ◽  
Caroline Trevisan Weber ◽  
Diego Silva Paz ◽  
Marcio Antonio Mazutti ◽  
Lucas Meili ◽  
...  
Keyword(s):  
Aqueous Solution ◽  
Activated Carbon ◽  
Adsorption Capacity ◽  
Intraparticle Diffusion ◽  
Second Order ◽  
Adsorption Kinetic ◽  
Bottle Gourd ◽  
Maximum Adsorption Capacity ◽  
Order Kinetic ◽  
Equilibrium Data

Activated carbon prepared from bottle gourd has been used as adsorbent for removal of leather dye (Direct Black 38) from aqueous solution. The activated carbon obtained showed a mesoporous texture, with surface area of 556.16 m2 g−1, and a surface free of organic functional groups. The initial dye concentration, contact time and pH significantly influenced the adsorption capacity. In the acid region (pH 2.5) the adsorption of dye was more favorable. The adsorption equilibrium was attained after 60 min. Equilibrium data were analyzed by the Langmuir, Freundlich, Dubinin–Radushkevich and Temkin isotherm models. The equilibrium data were best described by the Langmuir isotherm, with maximum adsorption capacity of 94.9 mg g−1. Adsorption kinetic data were fitted using the pseudo-first-order, pseudo-second-order, Elovich and intraparticle diffusion models. The adsorption kinetic was best described by the second-order kinetic equation. The adsorption process was controlled by both external mass transfer and intraparticle diffusion. Activated carbon prepared from bottle gourd was shown to be a promising material for adsorption of Direct Black 38 from aqueous solution.

Use of papaya seeds as a biosorbent of methylene blue from aqueous solution

2013 ◽  
Vol 68 (2) ◽  
pp. 441-447 ◽  
Author(s):  
Diego S. Paz ◽  
Alexandre Baiotto ◽  
Marcio Schwaab ◽  
Marcio A. Mazutti ◽  
Mariana M. Bassaco ◽  
...  
Keyword(s):  
Aqueous Solution ◽  
Methylene Blue ◽  
Second Order ◽  
Adsorption Kinetic ◽  
Maximum Adsorption Capacity ◽  
Order Model ◽  
Equilibrium Data ◽  
Pseudo Second Order ◽  
Papaya Seeds ◽  
Second Order Model

In this study papaya seeds were used to remove methylene blue dye from aqueous solution. Papaya seeds were characterized as possessing a macro/mesoporous texture and large pore size. Studies were carried out in batches to evaluate the effect of contact time and pH (2–12) on the removal of dye. It was observed that the adsorption of dye was better in the basic region (pH 12). The equilibrium data were analyzed using Langmuir, Freundlich, Dubinin–Raduschkevich, Tempkin, Jovanovich, Redlich–Peterson, Sips, Toth and Radke–Prausnitz isotherms. The equilibrium data were best described by the Langmuir isotherm with a maximum adsorption capacity of 637.29 mg g–1. Adsorption kinetic data were fitted using the pseudo-first-order and pseudo-second-order model. The adsorption kinetic is very fast and was best described by the pseudo-second-order model.

scholarly journals Adsorption of Lead(II) Ions from Aqueous Solution onto Lignin

2009 ◽  
Vol 27 (4) ◽  
pp. 435-445 ◽  
Author(s):  
Laura Bulgariu ◽  
Dumitru Bulgariu ◽  
Theodor Malutan ◽  
Matei Macoveanu
Keyword(s):  
Aqueous Solution ◽  
Ion Concentration ◽  
Maximum Adsorption Capacity ◽  
Order Kinetic ◽  
Solution Ph ◽  
Batch System ◽  
Equilibrium Data ◽  
Order Kinetic Model ◽  
Langmuir Isotherm Model ◽  
Pseudo Second Order

The adsorption of lead(II) ions from aqueous solution onto lignin was investigated in this study. Thus, the influence of the initial solution pH, the lignin dosage, the initial Pb(II) ion concentration and the contact time were investigated at room temperature (19 ± 0.5 °C) in a batch system. Adsorption equilibrium was approached within 30 min. The adsorption kinetic data could be well described by the pseudo-second-order kinetic model, while the equilibrium data were well fitted using the Langmuir isotherm model. A maximum adsorption capacity of 32.36 mg/g was observed. The results of this study indicate that lignin has the potential to become an effective and economical adsorbent for the removal of Pb(II) ions from industrial wastewaters.

scholarly journals Adsorption kinetics of Cr(VI) ions onto biochar from brewer’s spent grain

2019 ◽  
pp. 134-142
Author(s):  
Dragana Kukic ◽  
Vesna Vasic ◽  
Sanja Panic ◽  
Milos Radosavljevic ◽  
Marina Sciban ◽  
...  
Keyword(s):  
Kinetic Data ◽  
Order Equation ◽  
Adsorption Properties ◽  
Phosphorus Acid ◽  
Adsorption Kinetic ◽  
Activation Effect ◽  
Activated Biochar ◽  
Spent Grain ◽  
Pseudo Second Order ◽  
Kinetics Of

In this paper adsorption kinetic of Cr(VI) ions onto biochar from brewer?s spent grain was studied. The same study was performed on biochar activated by KOH and H3PO4. Non-activated biochar showed a greater ability to bind Cr(VI) ions at the same initial concentration and 10 times lower dose compared to the brewer?s spent grain. The investigation of activation effect showed that it did not improve the adsorption properties of biochar. The analysis of kinetic data showed that the best description provided pseudo-second order equation and that adsorption takes place as chemisorption on all investigated adsorbents. Diffusion study showed that pore diffusion occurs only on biochar activated by phosphorus acid.

scholarly journals Removal of organic pollutants from polluted drain using a chemically modified aquatic biomass as new nano-biosorbent

2020 ◽  
Author(s):  
Maha Abdallah ◽  
Ahmed Eid Al Prol
Keyword(s):  
Congo Red ◽  
Kinetic Data ◽  
Ph Value ◽  
Xylenol Orange ◽  
Order Equation ◽  
Second Order ◽  
Magnetic Composite ◽  
Initial Concentration ◽  
Equilibrium Data ◽  
Pseudo Second Order

Abstract The production of low-cost adsorbents for the detoxification of industrial effluents has been a growing concern for most environmental researchers. In this study, a magnetic active adsorbent and biomass (Phragmites australis) coated magnetic composite was synthesized and evaluated their effectiveness for the removal of two dyes from industrial polluted drain. In the present study, the biosorption of Congo red and xylenol orange ions from polluted drain discharge in Abu Qir Bay was determined using magnetic biosorbent. The surface function and morphology of the nano-biosorbent were studied by Fourier Transform Infrared analysis and scanning electron microscope imaging. The effect of initial dye concentration, pH, contact time, and concentration of nano-biosorbent has been studied at room temperature.The initial concentration increases as the absorption capacity of Congo red and Xylenol orange increase, especially for an initial concentration lower than 60 and 35 m/L for the two dyes respectively. Maximum percentage removal of Congo red and Xylenol orange by nano biosorbent is 77 and 47 % respectively. A strong dependence of the adsorption capacity on pH was observed, the capacity increase as pH value increase, and the optimum pH value is pH 10 for Congo red and pH 6 for Xylenol orange. Kinetics and adsorption equilibrium were studied for the studied dyes. The adsorption process was fast and the equilibrium was reached within 180 min. The maximum adsorption capacities were 1.88 and 4.62 mg g−1 for Congo red and Xylenol orange respectively. The kinetic data were analyzed using various kinetic models – pseudo-first-order equation, pseudo-second-order equation, and the equilibrium data were tested using several isotherm models, Langmuir, Freundlich, BET, and Tempkin. The pseudo-second-order equation provides the greatest accuracy for the kinetic data and Langmuir model is the closest fit for the equilibrium data.

Adsorption of methyl orange dye onto biochar adsorbent prepared from chicken manure

2018 ◽  
Vol 77 (5) ◽  
pp. 1303-1312 ◽  
Author(s):  
Jiangang Yu ◽  
Xingwen Zhang ◽  
Dong Wang ◽  
Ping Li
Keyword(s):  
Aqueous Solution ◽  
Methyl Orange ◽  
Chicken Manure ◽  
Maximum Adsorption Capacity ◽  
Solution Ph ◽  
Equilibrium Data ◽  
Intra Particle Diffusion ◽  
Endothermic Process ◽  
Langmuir Isotherm Model ◽  
Pseudo Second Order

Abstract In this work, the biochar adsorbent carboxymethyl cellulose (CMC), was prepared from the pyrolysis (600 °C, 120 min) of chicken manure for the removal of methyl orange (MO) from aqueous solution, and its physicochemical properties were characterized by scanning electron microscopy (SEM) and Fourier transform infrared spectra (FTIR). The experimental parameters including agitation speed, initial solution pH, biochar dosage and contact time on the adsorption properties of MO from aqueous solution onto CMC were investigated in batch experiments. The kinetic adsorption of different initial concentration could be accurately described by the pseudo-second-order model and the overall rate process was apparently influenced by external mass transfer and intra-particle diffusion. Furthermore, the Langmuir isotherm model showed a better fit with equilibrium data (R2 > 0.99), with the maximum adsorption capacity of 39.47 mg·g−1 at 25 °C. Moreover, the thermodynamic parameters indicated that the adsorption of MO onto CMC was a spontaneous and endothermic process. The results of this study indicated that CMC could be used as a promising biomass adsorbent material for aqueous solutions containing MO.

scholarly journals Sorption of Cu(II), Zn(II) and Pb(II) Ions in an Aqueous Solution on the PVC-Acetylacetone Composites

Polymers ◽  
2019 ◽  
Vol 11 (3) ◽  
pp. 513 ◽  
Author(s):  
Elzbieta Radzyminska-Lenarcik ◽  
Katarzyna Witt
Keyword(s):  
Aqueous Solution ◽  
Spectral Analysis ◽  
Electron Microscope ◽  
Kinetic Data ◽  
Order Equation ◽  
Ion Concentration ◽  
Infrared Spectral ◽  
Pseudo Second Order ◽  
Maximal Reduction ◽  
Scanning Electron

The possibility of removing Cu(II), Zn(II) and Pb(II) ions by sorption on new PVC-based composite materials with different contents of acetylacetone (acac) and porophor was investigated. Composites were characterized using a scanning electron microscope and by infrared spectral analysis (FTIR). Sorption tests were conducted at 20 °C. It has been shown that the equilibrium is established in about 4 h. The reduction in ion concentration in the solution depended on the content of both acac and porophor in the composite. The maximal reduction in ion concentration ranged from 8% to 91%, 10%–85% and 6%–50% for Cu(II), Zn(II) and Pb(II) ions, respectively, depending on the composite composition. The best results were obtained for the composite containing 30% w/w of acac and 10% of porophor. For this composite, the sorption capacity after 4 h sorption for Zn(II), Cu(II) and Pb(II) ions was 26.65, 25.40, and 49.68 mg/g, respectively. Kinetic data were best fitted with a pseudo–second-order equation.

Magnetic nanopowder as effective adsorbent for the removal of Congo Red from aqueous solution

2013 ◽  
Vol 69 (6) ◽  
pp. 1234-1240 ◽  
Author(s):  
O. Paşka ◽  
R. Ianoş ◽  
C. Păcurariu ◽  
A. Brădeanu
Keyword(s):  
Aqueous Solution ◽  
Adsorption Capacity ◽  
Congo Red ◽  
Polluted Water ◽  
Maximum Adsorption Capacity ◽  
Anionic Dyes ◽  
Solution Ph ◽  
Efficient Combustion ◽  
Equilibrium Data ◽  
Pseudo Second Order

A magnetic iron oxide nanopowder (MnP), prepared by a simple and efficient combustion synthesis technique, was tested for the removal of the anionic dye Congo Red (CR) from aqueous solution. The influence of solution pH, adsorbent dose, temperature, contact time and initial dye concentration on the adsorption of CR onto MnP were investigated. It was shown that the CR adsorption was pH dependent and the adsorption mechanism was governed by electrostatic forces. The adsorption kinetic was best described by the pseudo-second-order model and the equilibrium data were well fitted to the Langmuir isotherm, yielding maximum adsorption capacity of 54.46 mg g−1. The undeniable advantages of the MnP adsorbent such as inexpensive preparation method, good adsorption capacity and easy separation using an external magnetic field, recommend it as a promising candidate for the removal of anionic dyes from polluted water.

scholarly journals Activated Carbon from Spent Brewery Barley Husks for Cadmium Ion Adsorption from Aqueous Solution

2018 ◽  
Vol 18 (1) ◽  
pp. 145 ◽  
Author(s):  
Ilesanmi Osasona ◽  
Kayode Aiyedatiwa ◽  
Jonathan Johnson ◽  
Oluwabamise Lekan Faboya
Keyword(s):  
Aqueous Solution ◽  
Activated Carbon ◽  
Low Cost ◽  
Freundlich Isotherm ◽  
Solution Concentration ◽  
Isotherm Models ◽  
Cadmium Ion ◽  
Solution Ph ◽  
Barley Husk ◽  
Equilibrium Data

This study investigated the feasibility of using acid activated carbon prepared from brewery spent barley husks for the adsorption of cadmium from aqueous solution. The effects of operation parameters such as pH, contact time, adsorbent dosage, concentration and temperature were verified. The amount of cadmium adsorbed increased with increase in solution pH, initial solution concentration and with the amount of adsorbent dosed. A time of 5 minutes was required for attainment of equilibrium. The equilibrium data obtained were analysed using both Langmuir and Freundlich isotherm models and the data were better described by Langmuir model with correlation coefficient of 0.9183. The thermodynamic parameters revealed that the removal of cadmium by the activated carbon was exothermic and spontaneous. Thus, activated carbon obtained from brewery spent barley husk can be employed as an economically viable low-cost adsorbent for removing cadmium from aqueous solution. 

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