Feasibility Study of Benzene Dehydration through an Adsorption Process: Isotherm Determination, Kinetics, and Fixed-Bed Column Studies

2021 ◽  
Author(s):  
Mehrnaz Joulazadeh ◽  
Amir Rahimi ◽  
S. Javad Mirmohammadi ◽  
Masoud Kanani ◽  
Saeed Dadkhah ◽  
...  
Keyword(s):  
Feasibility Study ◽  
Adsorption Process ◽  
Fixed Bed ◽  
Column Studies ◽  
Fixed Bed Column

Fixed-Bed Column Study for Zn (II) Removal from Solution Using Raw Rice Husk

2011 ◽  
Vol 197-198 ◽  
pp. 234-237
Author(s):  
Zai Fang Deng ◽  
Xue Gang Luo ◽  
Xiao Yan Lin
Keyword(s):  
Rice Husk ◽  
Flow Rate ◽  
Adsorption Process ◽  
Fixed Bed ◽  
Design Parameters ◽  
Column Studies ◽  
Fixed Bed Column ◽  
Initial Concentration ◽  
Column Design ◽  
Bed Depth Service Time

A fixed bed of raw rice husk was used for the removal of Zn (II) from aqueous solution. The material as adopted was found to be an efficient media for the removal of Zn (II) in continuous mode using fixed bed column. Different column design parameters like depth of exchange zone, flow rate and initial concentration were calculated. When conducted with Zn (II) concentration 10 mg.L-1 and flow rate 10 ml.min-1 with different bed depths such as 3, 6 and 9 cm, the equilibrium uptake was 3.366, 2.847 and 2.764 mg.g-1, respectively. The equilibrium uptake decreased from 2.802 to 1.975 mg.g-1 with increasing of flow rate from 5 to 15 mL.min-1 and increased from 2.764 to 3.798 mg.g-1 when initial concentration increased from 10 to 30 mg.L-1. The dynamics of adsorption process was modeled by bed depth service time (BDST), and indicating the validity of BDST model when applied to the continuous column studies.

Fixed-Bed Column Study for Zn (II) Removal from Solution Using Expanding Rice Husk

2011 ◽  
Vol 695 ◽  
pp. 29-32
Author(s):  
Zai Fang Deng ◽  
Xue Gang Luo ◽  
Xiao Yan Lin
Keyword(s):  
Rice Husk ◽  
Flow Rate ◽  
Adsorption Process ◽  
Fixed Bed ◽  
Design Parameters ◽  
Column Studies ◽  
Fixed Bed Column ◽  
Initial Concentration ◽  
Bed Height ◽  
Column Design

The performance of expanding rice husk (ERH) fixed bed column in removing Zn (II) from aqueous solution were studied in this work. Different column design parameters like bed height, flow rate and initial concentration were calculated. It was found that ERH was found to be an effective adsorbent for removal of Zn (II); and when conducted with Zn (II) concentration 12.8 mg L-1and flow rate 10 ml min-1with different bed depths such as 3, 6 and 9 cm, the equilibrium uptake was decreased from 5.181 to 4.33 mg g-1; the equilibrium uptake also decreased from 4.51 to 3.807 mg g-1with increasing of flow rate from 5 to 15 ml min-1and increased from 4.447 to 5.752 mg g-1when initial concentration increased from 12.8 to 35 mg L-1. The dynamics of adsorption process was modeled by bed depth service time (BDST), and indicating the validity of BDST model when applied to the continuous column studies.

scholarly journals Adsorption of cationic dye onto fly ash-based geopolymer: Batch and fixed bed column studies

2018 ◽  
Vol 149 ◽  
pp. 02088 ◽  
Author(s):  
Marouane El Alouani ◽  
Saliha Alehyen ◽  
Mohammed El Achouri ◽  
M’hamed Taibi
Keyword(s):  
Fly Ash ◽  
Kinetic Models ◽  
Adsorption Process ◽  
Fixed Bed ◽  
Dye Adsorption ◽  
Second Order ◽  
Cationic Dye ◽  
Column Studies ◽  
Fixed Bed Column ◽  
Pseudo Second Order

Cationic dye adsorption from aqueous solution onto synthesized geopolymer was investigated by batch and fixed bed column experiments. The geopolymer material was elaborated by alkali solution and fly ash supplied by Jorf Lasfar power plant of Morocco. Physical and chemical characteristics of samples were determined by FX, DRX, SEM, 29Si MAS NMR and Zeta potential methods. The Brunauer, Emmett and Teller (BET) technique is used to determine the surface area. The Barrett-Joyner-Halenda (BJH) method was performed to obtain pore size distribution curves and average pore diameter. Kinetics data were analyzed using pseudo-first-order, pseudo-second-order and intraparticle diffusion models. To predict the breakthrough curves and determine the main fixed bed column parameters, three kinetic models; Tomas, Bohart–Adams and Yoon-Nelson models are applied to fitting the experimental data. The kinetic study showed that the pseudo-second-order can be used to describe the methylene blue (MB) adsorption process on the geopolymer matrix. The kinetic models of the adsorption in dynamic column are suitable to describe the continuous adsorption process of dyestuff by the geopolymer. The results of this study indicated that geopolymer derived from fly ash can be used as a low cost effective adsorbent for cationic dye removal from industrial aqueous effluent.

Continuous fixed-bed column studies of arsenite removal via oxidation and adsorption coprocesses

2021 ◽  
Vol 42 ◽  
pp. 102176
Author(s):  
Pummarin Khamdahsag ◽  
Dickson Y.S. Yan ◽  
Pongnapa Poompang ◽  
Nichapa Supannafai ◽  
Visanu Tanboonchuy
Keyword(s):  
Fixed Bed ◽  
Column Studies ◽  
Fixed Bed Column ◽  
Arsenite Removal

scholarly journals Continuous Fixed-Bed Column Studies on Congo Red Dye Adsorption-Desorption Using Free and Immobilized Nelumbo nucifera Leaf Adsorbent

Polymers ◽  
2021 ◽  
Vol 14 (1) ◽  
pp. 54
Author(s):  
Vairavel Parimelazhagan ◽  
Gautham Jeppu ◽  
Nakul Rampal
Keyword(s):  
Congo Red ◽  
Agricultural Waste ◽  
Fixed Bed ◽  
Dye Adsorption ◽  
Nelumbo Nucifera ◽  
Substantial Contribution ◽  
Flow Mode ◽  
Waste Biomass ◽  
Column Studies ◽  
Fixed Bed Column

The adsorption of Congo red (CR), an azo dye, from aqueous solution using free and immobilized agricultural waste biomass of Nelumbo nucifera (lotus) has been studied separately in a continuous fixed-bed column operation. The N. nucifera leaf powder adsorbent was immobilized in various polymeric matrices and the maximum decolorization efficiency (83.64%) of CR occurred using the polymeric matrix sodium silicate. The maximum efficacy (72.87%) of CR dye desorption was obtained using the solvent methanol. Reusability studies of free and immobilized adsorbents for the decolorization of CR dye were carried out separately in three runs in continuous mode. The % color removal and equilibrium dye uptake of the regenerated free and immobilized adsorbents decreased significantly after the first cycle. The decolorization efficiencies of CR dye adsorption were 53.66% and 43.33%; equilibrium dye uptakes were 1.179 mg g–1 and 0.783 mg g–1 in the third run of operation with free and immobilized adsorbent, respectively. The column experimental data fit very well to the Thomas and Yoon–Nelson models for the free and immobilized adsorbent with coefficients of correlation R2 ≥ 0.976 in various runs. The study concludes that free and immobilized N. nucifera can be efficiently used for the removal of CR from synthetic and industrial wastewater in a continuous flow mode. It makes a substantial contribution to the development of new biomass materials for monitoring and remediation of toxic dye-contaminated water resources.

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