scholarly journals Removal of Chlorinated Chemicals in H2Feedstock Using Modified Activated Carbon

2015 ◽  
Vol 2015 ◽  
pp. 1-9 ◽  
Author(s):  
Prapaporn Luekittisup ◽  
Visanu Tanboonchauy ◽  
Jitlada Chumee ◽  
Somrudee Predapitakkun ◽  
Rattanawan W. Kiatkomol ◽  
...  
Keyword(s):  
Activated Carbon ◽  
Adsorption Capacity ◽  
Space Velocity ◽  
Packed Bed ◽  
Breakthrough Curves ◽  
Velocity Range ◽  
Modified Activated Carbon ◽  
Packed Bed Column ◽  
Nelson Model ◽  
Weight Hourly Space Velocity

Activated carbon (GAC) was impregnated by sodium and used as adsorbent to remove chlorinated hydrocarbon (CHC) gases contaminated in H2feedstock. The adsorption was carried out in a continuous packed-bed column under the weight hourly space velocity range of 0.8–1.0 hr−1. The adsorption capacity was evaluated via the breakthrough curves. This modified GAC potentially adsorbed HCl and VCM of 0.0681 gHCl/gadsorbentand 0.0026 gVCM/gadsorbent, respectively. It showed higher adsorption capacity than SiO2and Al2O3balls for both organic and inorganic CHCs removal. In addition, the kinetic adsorption of chlorinated hydrocarbons on modified GAC fit well with Yoon-Nelson model.

Adsorption performance of packed bed column for the removal of perchlorate using modified activated carbon

2018 ◽  
Vol 117 ◽  
pp. 350-362 ◽  
Author(s):  
Radhika R. ◽  
Jayalatha T. ◽  
Rekha Krishnan G. ◽  
Salu Jacob ◽  
Rajeev R. ◽  
...  
Keyword(s):  
Activated Carbon ◽  
Packed Bed ◽  
Modified Activated Carbon ◽  
Packed Bed Column ◽  
Adsorption Performance

Factors Influencing Adsorption of PH3 on Modified Activated Carbon

2009 ◽  
Vol 79-82 ◽  
pp. 39-42 ◽  
Author(s):  
Bing Nan Ren
Keyword(s):  
Activated Carbon ◽  
Adsorption Capacity ◽  
Oxygen Content ◽  
Reaction Temperature ◽  
High Efficiency ◽  
Physical Adsorption ◽  
Space Velocity ◽  
Modified Activated Carbon ◽  
Factors Influencing ◽  
Yellow Phosphorus

Carbon materials have a very large surface area and various surface functional groups. They have been widely used as the adsorbent alone or the modified surface to adsorb pollutants. In the process of producing of yellow phosphorus by electric furnace, about 3000 m3 tail gas will be let out for one ton yellow phosphorus production. Tail gases consist of 90% of carbon monoxide (CO) and phosphine (PH3). The PH3 prevents the highly efficient utilization of CO and is an irritant and general systemic poison. Therefore, it is necessary to study how to effectively remove PH3 in tail gases. Due to the fact that selective adsorption of non-modified activated carbon (AC) is not enough to remove PH3 with a high efficiency, modification of AC might be an attractive route to improve the adsorption capacity. In this paper, experiments were carried out to study the factors influencing the adsorption of PH3 on the modified AC such as the concentration of impregnant, reaction temperature, oxygen content and space velocity. The results showed that the 5% HCl was the optimum concentration of impregnant. In the presence of oxygen, the adsorption capacity of modified AC was more than that in the absence of oxygen. In addition, with the improvement of the reaction temperature, the adsorption capacity of modified AC was increasing initially then decreasing, because of the transition from physical adsorption to chemical adsorption as priority. The adsorption capacity of the modified AC was enhanced initially with the increasing of oxygen content. Once the oxygen content was enhanced over 1%, there was no significant increase in the adsorption capacity of modified AC. The adsorption capacity of modified AC was decreased with the increasing of space velocity. The optimum parameters of reaction were 5% HCl of impregnant, 70°C of reaction temperature, 1% of oxygen content, and space velocity 10～20min-1.

scholarly journals Removal of acetylsalicylic acid (ASA) in packed microcolumns with carbon xerogel modified with TiO2 nanoparticles

2019 ◽  
Vol 39 (2) ◽  
Author(s):  
Viviana Eloisa Gomez Rengifo ◽  
Adriana Herrera Barros ◽  
Jorge Hernan Sanchez Toro
Keyword(s):  
Acetylsalicylic Acid ◽  
Adsorption Capacity ◽  
Tio2 Nanoparticles ◽  
Dispersion Model ◽  
Packed Bed ◽  
Breakthrough Curves ◽  
Bet Surface Area ◽  
Maximum Adsorption Capacity ◽  
Carbon Xerogel ◽  
Complementary Techniques

The adsorption capacity of acetylsalicylic acid was evaluated using carbon xerogel (CX) and carbon xerogel modified with TiO2 nanoparticles (CXM). These materials were characterized by different techniques such as Scanning Electron Microscopy (SEM), X-Ray Diffraction (XRD), and Fourier Transform Infrared (FTIR) spectroscopy. BET surface area measurements found values of 762 m2/g and 214 m2/g for CX and CXM, respectively. Batch experiments show that the Langmuir-Freundlich model best represents the experimental adsorption isotherm, in addition to show a maximum adsorption capacity of 17,48 mg/g.  In continuous experiments, the effect of the inlet concentration and flow rate on the adsorption capacity of the micro-packed bed adsorber were evaluated. Breakthrough curves agree well with the axial dispersion model. In view of their adsorption capacity, carbon xerogels provide a potential material for the removal of emergent contaminants from the pharmaceutical industry. Besides, the incorporation of TiO2 nanoparticles allows the implementation of complementary techniques, e.g. photodegradation, as an alternative to achieve higher elimination of aqueous contaminants.

Adsorption of acrylonitrile and methyl acrylate on activated carbon in a packed bed column

Adsorption ◽  
2006 ◽  
Vol 12 (3) ◽  
pp. 205-212 ◽  
Author(s):  
Fengsong Wang ◽  
Jun Li ◽  
Jiarong Wang ◽  
Haoqi Gao
Keyword(s):  
Activated Carbon ◽  
Methyl Acrylate ◽  
Packed Bed ◽  
Packed Bed Column

Characteristics of Activated Carbon Modified with Nitric Acid and its Performance in Catalytic Ozonation of Acid Red 3R

2013 ◽  
Vol 726-731 ◽  
pp. 1687-1690
Author(s):  
Jing Zhang ◽  
Jian Song Liu ◽  
Chun Liu ◽  
Jing Liang Yang ◽  
Lei Zhang
Keyword(s):  
Activated Carbon ◽  
Nitric Acid ◽  
Adsorption Capacity ◽  
Functional Groups ◽  
Chemical Properties ◽  
Catalytic Ozonation ◽  
Alkaline Condition ◽  
Ozone Decomposition ◽  
Acid Modification ◽  
Modified Activated Carbon

The structure and surface chemical properties of activated carbon after nitric acid modification and their influences on adsorption and catalytic ozonation of acid red 3R were investigated. The results showed that both specific surface area and micropore volume of activated carbon decreased, but mesopore volume increased after nitric acid modification. The adsorption capacity and catalytic ozonation performance of modified activated carbon were influenced due to the increased surface acidic functional groups. The adsorption capacity of modified activated carbon was enhanced under acidic condition due to dispersion interaction between increased surface acidic functional groups and acid red 3R. The increase in surface acidic functional groups of activated carbon was also considered to be responsible for improvement of the catalytic ozonation of acid red 3R under alkaline condition, because of their participation in the ozone decomposition and OH generation.

Removal of bromate from water using modified activated carbon

2012 ◽  
Vol 12 (3) ◽  
pp. 398-405 ◽  
Author(s):  
Tongmian Liu ◽  
Fuyi Cui ◽  
Dongmei Liu ◽  
Zhiwei Zhao ◽  
Zhiquan Liu ◽  
...  
Keyword(s):  
Activated Carbon ◽  
Adsorption Capacity ◽  
Electrostatic Interactions ◽  
Adsorption Process ◽  
Chemical Properties ◽  
Modified Activated Carbon ◽  
Surface Basicity ◽  
Adsorption Data ◽  
Physical And Chemical ◽  
And Chemical Properties

Coal-based activated carbon (AC) was treated chemically with nitric acid, sodium hydroxide and ammonia, and its ability to adsorb bromate was investigated. Several techniques were used to characterize the physicochemical properties of these materials, including surface area, pHpzc, and Boehm titration. Results indicated that surface physical and chemical properties can influence the adsorption uptake of bromate on ACs simultaneously. Surface basicity and pHpzc were both found to influence the electrostatic interactions between the bromate ions and the surface of the carbon. A correlation was found between basic groups and the adsorption capacity for bromate. The adsorption capacity of the carbon was found to be linearly proportional to the amount of basic groups on the surface. The bromate adsorption data collected from all the samples were found to fit the Toth isotherm model, indicating that the bromate adsorption process could occur on heterogeneous surfaces.

scholarly journals Calcium PretreatedHevea brasiliensisSawdust for Copper Removal: Batch and Column Study

2015 ◽  
Vol 2015 ◽  
pp. 1-9
Author(s):  
Swarup Biswas ◽  
Umesh Mishra
Keyword(s):  
Adsorption Capacity ◽  
Adsorption Process ◽  
Copper Ion ◽  
Packed Bed ◽  
Isotherm Models ◽  
Batch Adsorption ◽  
Maximum Adsorption Capacity ◽  
Packed Bed Column ◽  
Pseudo Second Order ◽  
Kinetics Of

Calcium pretreatedHevea brasiliensissawdust has been used as an effective and efficient adsorbent for the removal of copper ion from the contaminated water. Batch experiment was conducted to check the effect of pH, initial concentration, contact time, and adsorbent dose. The results conclude that adsorption capacity of adsorbent was influenced by operating parameters. Maximum adsorption capacity found from the batch adsorption process was 37.74 mg/g at pH of 5.6. Various isotherm models like Langmuir, Freundlich, and Temkin were used to compare the theoretical and experimental data, whereas the pseudo-first-order, pseudo-second-order, and intraparticle diffusion models were applied to study the kinetics of the batch adsorption process. Dynamic studies were also conducted in packed-bed column using different bed depths and the maximum adsorption capacity of 34.29 was achieved. Characterizations of the adsorbent were done by Fourier transform infrared spectroscopy, scanning electron microscope, and energy dispersive X-ray spectroscopy.

Sorption of Cr (VI) onto Olive Stone in a Packed Bed Column: Prediction of Kinetic Parameters and Breakthrough Curves

2010 ◽  
Vol 136 (12) ◽  
pp. 1389-1397 ◽  
Author(s):  
M. A. Martín-Lara ◽  
F. Hernáinz ◽  
G. Blázquez ◽  
G. Tenorio ◽  
M. Calero
Keyword(s):  
Kinetic Parameters ◽  
Packed Bed ◽  
Breakthrough Curves ◽  
Packed Bed Column ◽  
Olive Stone
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