scholarly journals An Experimental and Kinetic Study of the Sorption of Carbon Dioxide onto Amine-Treated Oil Fly Ash

2016 ◽  
Vol 2016 ◽  
pp. 1-11 ◽  
Author(s):  
Mohammed A. Saad ◽  
Mohammed J. Al-Marri ◽  
Ali L. Yaumi ◽  
Ibnelwaleed A. Hussein ◽  
Reyad Shawabkeh
Keyword(s):  
Carbon Dioxide ◽  
Fly Ash ◽  
Adsorption Capacity ◽  
Adsorption Process ◽  
Physical Adsorption ◽  
Ammonium Hydroxide ◽  
Relative Pressure ◽  
Monolayer Adsorption ◽  
Adsorption Of Co ◽  
Oil Fly Ash

A new CO2adsorbent is produced from waste oil fly ash (OFA). Ammonium hydroxide solution is used to convert OFA to activated carbon. Then, the product is used for the adsorption of CO2from a nitrogen/carbon dioxide (N2/CO2) gas mixture. The OFA samples are characterized by several techniques. Chemical treatment of OFA considerably changed its surface morphology. In particular, its surface area, as determined by BET measurements, increased from 59 to 318 m2/g. The amine-functionalized ash had a monolayer adsorption capacity of 74.51 mg/g and was obtained at relative pressure,0.05<p/ps<0.35. A kinetics study showed that the CO2adsorption capacity of OFA increased with increasing CO2flow rates and concentrations and decreasing the relative humidity. Unlike physical adsorption, the chemisorption process resulted in increased adsorption capacity with increasing temperatures over the range 0–40°C. We also found that the adsorption process was endothermic (80–173 kJ/mol). The isotherm data for the adsorption process were fitted using different models. The saturation capacity determined from the Sips model, which corresponds to the sum of the saturation capacities of all of the adsorbed layers, was 540.3 mg/g of ash.

Surface modification of oil fly ash and its application in selective capturing of carbon dioxide

2013 ◽  
Vol 266 ◽  
pp. 118-125 ◽  
Author(s):  
Ali L. Yaumi ◽  
Ibnelwaleed A. Hussien ◽  
Reyad A. Shawabkeh
Keyword(s):  
Carbon Dioxide ◽  
Surface Modification ◽  
Fly Ash ◽  
Oil Fly Ash

scholarly journals Preparation of aminated chitosan microspheres by one-pot method and their adsorption properties for dye wastewater

2019 ◽  
Vol 6 (5) ◽  
pp. 182226 ◽  
Author(s):  
Jian Meng ◽  
Jianlan Cui ◽  
Siyuan Yu ◽  
Hui Jiang ◽  
Congshan Zhong ◽  
...  
Keyword(s):  
Adsorption Capacity ◽  
Adsorption Process ◽  
Physical Adsorption ◽  
Dye Adsorption ◽  
Cross Linking ◽  
Dye Wastewater ◽  
Ethylene Imine ◽  
One Pot ◽  
Chitosan Microspheres ◽  
Multiple Process

Polyamine chelating adsorbents have a good removal effect on dye wastewater. In this study, small molecule triethylenetetramine and macromolecular poly(ethylene imine) were selected as aminated reagent, and two kinds of aminated chitosan microspheres, TETA-CTSms and PEI-CTSms, were obtained by emulsion cross-linking method. The microspheres were fully characterized by FTIR, SEM, XRD, EDS and TGA. EDS results showed that the N content of the PEI-CTSms and TETA-CTSms microspheres increased significantly after the cross-linking reaction and can reach 5.7 wt% and 7.3 wt%, respectively. Adsorption experiments confirmed that TETA-CTSms and PEI-CTSms showed greater adsorption characteristics for anionic dye reactive yellow (RY) in aqueous solutions compared with CTSms, and the adsorption capacity per unit area was increased by 39.11% and 88.56%, respectively. The adsorption capacity of aminated microspheres for RY decreased with the increase of pH. The adsorption kinetics conformed to the pseudo-second-order model, and the adsorption process was in accordance with the Langmuir isotherm model. The negative value of Δ G confirmed that the adsorption process was spontaneous, and the dye adsorption was a multiple process dominated by chemical chelating and physical adsorption.

scholarly journals Core-shell Fe3O4@zeolite NaA as an Adsorbent for Cu2+

Materials ◽  
2020 ◽  
Vol 13 (21) ◽  
pp. 5047
Author(s):  
Jun Cao ◽  
Peng Wang ◽  
Jie Shen ◽  
Qi Sun
Keyword(s):  
Adsorption Capacity ◽  
Adsorption Process ◽  
Core Shell ◽  
X Ray Diffraction ◽  
X Ray ◽  
Ph Values ◽  
Transmission Electron ◽  
Monolayer Adsorption ◽  
Zeolite Naa ◽  
Infrared Spectrometer

Here, using Fe3O4@SiO2 as a precursor, a novel core-shell structure magnetic Cu2+ adsorbent (Fe3O4@zeolite NaA) was successfully prepared. Several methods, namely X-ray diffraction (XRD), Fourier transform infrared spectrometer (FTIR), Transmission electron microscope (TEM), Brunauer Emmett Teller (BET) and vibrating sample magnetometry (VSM) were used to characterize the adsorbent. A batch experiment was conducted to study the Cu2+ adsorption capacity of Fe3O4@zeolite NaA at different pH values, contact time, initial Cu2+ concentration and adsorbent does. It is found that the saturated adsorption capacity of Fe3O4@zeolite NaA on Cu2+ is 86.54 mg/g. The adsorption isotherm analysis shows that the adsorption process of Fe3O4@zeolite NaA to Cu2+ is more consistent with the Langmuir model, suggesting that it is a monolayer adsorption. Adsorption kinetics study found that the adsorption process of Fe3O4@zeolite NaA to Cu2+ follows the pseudo-second kinetics model, which means that the combination of Fe3O4@zeolite NaA and Cu2+ is the chemical chelating reaction. Thermodynamic analysis shows that the adsorption process of Fe3O4@zeolite NaA to Cu2+ is endothermic, with increasing entropy and spontaneous in nature. The above results show that Fe3O4@zeolite NaA is a promising Cu2+ adsorbent.

Ferric ion adsorption and electrodesorption by carbon nanotubes and nanofibres films

2009 ◽  
Vol 59 (8) ◽  
pp. 1657-1663 ◽  
Author(s):  
Haibo Li ◽  
Likun Pan ◽  
Yanping Zhang ◽  
Zhuo Sun
Keyword(s):  
Carbon Nanotubes ◽  
Adsorption Process ◽  
Physical Adsorption ◽  
Chemical Vapor ◽  
Ion Adsorption ◽  
Order Model ◽  
First Order ◽  
Monolayer Adsorption ◽  
Pressure Chemical ◽  
Kinetics And Isotherms

Carbon nanotubes and nanofibres (CNTs-CNFs) films have been grown on Ni sheets by low pressure chemical vapor deposition system and show good physical adsorption capability for ferric (Fe3 + ) ions. The studies of adsorption kinetics and isotherms indicate that Fe3 +  adsorption process was regarded as first-order model and followed a Langmuir isotherm indicating monolayer adsorption. The saturated CNTs-CNFs film is easy to be regenerated by electrodesorption with direct voltage applied. The result shows that the combination of adsorption and electrodesorption by CNTs-CNFs is a promising technology to remove the Fe3 +  contamination in solution, which can be further extended to the process of other heavy metal ions.

Adsorption and recovery of nonylphenol ethoxylate on a crosslinked β-cyclodextrin-carboxymethylcellulose polymer

2010 ◽  
Vol 61 (9) ◽  
pp. 2293-2301 ◽  
Author(s):  
Danielle Bonenfant ◽  
Patrick Niquette ◽  
Murielle Mimeault ◽  
Robert Hausler
Keyword(s):  
Adsorption Capacity ◽  
Atmospheric Pressure ◽  
Active Sites ◽  
Adsorption Process ◽  
Adsorption Equilibrium ◽  
Physical Adsorption ◽  
Polymer Network ◽  
Homogeneous Distribution ◽  
Nonylphenol Ethoxylate ◽  
Monolayer Coverage

A study of adsorption/recovery of nonylphenol 9 mole ethoxylate (NP9EO) on a crosslinked β-cyclodextrin-carboxymethylcellulose (β-CD-CMC) polymer was carried out by ultraviolet-visible (UV-vis) and Fourier transform infrared (FTIR) spectroscopies. The adsorption was performed in mixtures containing 500 mg of the β-CD-CMC polymer and aqueous NP9EO solutions at concentrations 12–82 mg/L, whereas the recovery of NP9EO was effectuated by shaking the β-CD-CMC polymer loaded with methanol. The assays were made at 25°C and atmospheric pressure under agitation. The results have shown that the adsorption is a rapid process and the β-CD-CMC polymer exhibits a high NP9EO adsorption capacity of 83–92 w% (1.1–6.8 mg NP9EO/g β-CD-CMC polymer) dependent of the initial NP9EO concentration in liquid phase. This adsorption may involve the formation of an inclusion complex β-CD-NP9EO and a physical adsorption in the polymer network. The adsorption equilibrium measurements, which were analyzed using the Langmuir isotherm, have indicated a monolayer coverage and the homogeneous distribution of active sites at the surface of the β-CD-CMC polymer. Moreover, the negative value obtained for the free energy change (−13.2 kJ/mol) has indicated that the adsorption process is spontaneous. In parallel, the β-CD-CMC polymer exhibited a high NP9EO recovery efficiency of 97 w% that may occur through a decrease of binding strength between β-CD-CMC polymer and NP9EO. Together, these results suggest that the β-CD-CMC polymer could constitute a good adsorbent for removing nonylphenol ethoxylates from wastewater due to its high adsorption capacity and non-toxic character of β-CD and CMC to environment.

THE PREPARATION AND SINTERING OF FINELY DIVIDED SODIUM CHLORIDE. II

1957 ◽  
Vol 35 (12) ◽  
pp. 1511-1521 ◽  
Author(s):  
J. B. Moffat ◽  
R. McIntosh
Keyword(s):  
Carbon Dioxide ◽  
Water Vapor ◽  
Sodium Chloride ◽  
Specific Surface ◽  
Physical Adsorption ◽  
Ion Pairs ◽  
Adsorbed Water ◽  
Qualitative Theory ◽  
Relative Pressure ◽  
Fractional Change

The sintering of unpacked samples of sodium chloride of high specific surface has been investigated. The sintering occurred in the presence of known pressures of water vapor and at temperatures below 70 °C. The progress of the change of specific surface was followed by measuring the physical adsorption of carbon dioxide at approximately −80 °C. It has been shown that an unchanging value of the surface area of a given sample exists at each relative pressure of water vapor. The area attained is independent of the number of exposures to water vapor at pressures below the final pressure. The fractional change of area of all samples in the range 35 to 80 m•2/g. depends only upon the relative pressure of water vapor. Preliminary observations of the behavior of loaded samples showed that packing the samples does not affect the character of the sintering.A qualitative theory to account for these findings is given. It is postulated that certain ion pairs become mobile when the binding energy to the crystal is reduced by the adsorbed water. On increasing the amount of adsorbed water additional ion pairs become free to migrate and the process resulting in loss of specific surface continues to a further extent.

scholarly journals Controllable Preparation of Cubic Zeolite A and Application of Langmuir Model in Carbon Dioxide Adsorption

Nanomaterials ◽  
2021 ◽  
Vol 11 (12) ◽  
pp. 3375
Author(s):  
Peng Wang ◽  
Jun Cao ◽  
Yujiao Zhang ◽  
Qi Sun
Keyword(s):  
Carbon Dioxide ◽  
Fly Ash ◽  
Adsorption Capacity ◽  
Langmuir Model ◽  
Maximum Adsorption Capacity ◽  
Zeolite A ◽  
Carbon Dioxide Adsorption ◽  
Commercial Grade ◽  
Oxygen Tetrahedron ◽  
Zeolite 4A

A large amount of remaining fly ash has been piled up or landfilled, which not only a waste of land resources but also results in a series of environmental problems. Therefore, using fly ash to produce high value-added products is a win-win development orientation between human beings and nature. In this study, zeolite A is successfully synthesized using a hydrothermal method using fly ash. Additionally, it is at 1.0 mol·L−1 of the alkali concentration that the crystallinity of zeolite A reaches the maximum value, about 96.6%. FTIR research shows that the main secondary structural unit D4R vibration band of zeolite A appears at 555 cm−1. The results of the SEM study indicate the structure of zeolite A is cubic. The TEM results show that the crystal structure of the zeolite A belongs to the body-centered cubic structure. Meanwhile, the positively charged sodium ions cooperate with the silicon oxygen tetrahedron and the aluminum oxygen tetrahedron to form the zeolite A skeleton. Carbon dioxide adsorption equilibrium study shows that the maximum adsorption capacity of zeolite A of 46.5 mL·g−1 is significantly higher than the maximum adsorption capacity of commercial-grade zeolite 4A of 39.3 mL·g−1. In addition, the application of the Langmuir model in the adsorption of carbon dioxide by commercial-grade zeolite 4A and zeolite A is studied, which not only extends the application of zeolite A, but can be further extended to other zeolite materials as well. Meanwhile, the adsorption process belongs to the Langmuir model, which is a single layer adsorption on an ideal surface.

Influence of Lime Dust on Chloride Binding Capacity of Fly Ash-Cement Paste

2011 ◽  
Vol 399-401 ◽  
pp. 1191-1195
Author(s):  
Xiang Hao Wu ◽  
Shan Shan Yang ◽  
Cong Kai Zhang ◽  
Pan Yuan
Keyword(s):  
Fly Ash ◽  
Adsorption Capacity ◽  
Cement Paste ◽  
Adsorption Equilibrium ◽  
Binding Capacity ◽  
Physical Adsorption ◽  
Dust Content ◽  
Chloride Binding ◽  
Cement Pastes ◽  
Chemical Combination

The influence of the way and the volume of adding lime dust to fly ash-cement pastes on chloride physical adsorption capacity, chemical combination capacity and binding capacity of fly ash-cement pastes is investigated by adsorption equilibrium method. The results show that with the volume of lime dust as cement replacement raising, the amount of chloride physically adsorbed by fly ash-cement pastes reduces, while the amount of chloride chemical combining is firstly increase, and then decrease, and it reaches the maximum when the lime dust content is 10% , that of chloride binding is firstly increase, and then decrease, which reaches the maximum when the lime dust content is 5%. In addition, with the volume of lime dust as fly ash replacement increasing , the volume of chloride physically adsorbed by fly ash-cement pastes reduces firstly, and then raises, reaching the minimum when the lime dust content is 6%. Whereas, volume of chloride chemical combining and binding both decrease gradually with the increase of lime dust contents. When the population of lime dust as cement or fly ash replacement is low(less than 15% for cement and 9% for fly ash), effect of lime dust content on chloride binding capacity of fly ash-cement pastes is not obvious (under 7.5%).

scholarly journals Adsorptive Separation Studies ofβ-Carotene from Methyl Ester Using Mesoporous Carbon Coated Monolith

2013 ◽  
Vol 2013 ◽  
pp. 1-6 ◽  
Author(s):  
M. Muhammad ◽  
Moonis Ali Khan ◽  
T. S. Y. Choong
Keyword(s):  
Methyl Ester ◽  
Adsorption Capacity ◽  
Contact Time ◽  
Mesoporous Carbon ◽  
Adsorption Process ◽  
Physical Adsorption ◽  
Order Model ◽  
Kinetics And Thermodynamics ◽  
Carbon Coated ◽  
Pseudo Second Order

Adsorption ofβ-carotene on mesoporous carbon coated monolith (MCCM) from methyl ester as a solvent was investigated. Kinetics and thermodynamics parameters have been evaluated. Maximumβ-carotene adsorption capacity was 22.37 mg/g at 50 °C. Process followed Langmuir isotherm. The adsorption was endothermic and spontaneous. Contact time studies showed increase in adsorption capacity with increase inβ-carotene initial concentration and temperature. Pseudo-second-order model was applicable to the experimental data. The value of activation energy confirmed physical adsorption process.

The adsorption and mass-transfer process of cationic red X-GRL dye on natural zeolite

2016 ◽  
Vol 73 (9) ◽  
pp. 2119-2131 ◽  
Author(s):  
Jingjing Tian ◽  
Junfang Guan ◽  
Huimin Gao ◽  
Yafei Wen ◽  
Zijie Ren
Keyword(s):  
Mass Transfer ◽  
Adsorption Capacity ◽  
Transfer Process ◽  
Natural Zeolite ◽  
Adsorption Process ◽  
Physical Adsorption ◽  
Low Cost ◽  
Mass Transfer Process ◽  
Pore Diffusion ◽  
Film Diffusion

The adsorption behavior of natural zeolite was studied in order to determine the adsorption capacity and mass-transfer process of cationic red X-GRL (C18H21BrN6) onto the adsorbent. The adsorption tests to determine both the uptake capacity and the mass-transfer process at equilibrium were performed under batch conditions, which showed rapid uptake in general for the initial 5 min, corresponding to 92% total removal. The equilibrium adsorption capacity value (qe,cal) in pseudo-second-order kinetics was 13.51 mg/g at 293 K and the whole adsorption process was governed by physical adsorption with an endothermic, endothermic spontaneous nature. Adsorption tests indicated that the zeolite has great potential as an alternative low-cost material in the treatment of X-GRL drainage. However, the mass-transfer process to determine the rate-controlling steps showed that both film diffusion and pore diffusion were important in controlling the adsorption rate. The adsorption process was governed by film diffusion while pore diffusion was poor because the X-GRL molecules could not penetrate into the zeolite easily. The X-GRL molecules were only adsorbed on the external surface of the zeolite. Hence, to improve the adsorption capacity of natural zeolite further, modification to expand its micropores is necessary.

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