Adsorption and Desorption of Low-Content Toluene^|^#8211;Ethyl Acetate Gas Mixtures on Fixed-Bed Activated Carbon for Removal and Concentration by TSA

2014 ◽  
Vol 40 (1) ◽  
pp. 18-26
Author(s):  
Toshio Yamaguchi ◽  
Kazuya Aoki ◽  
Makoto Sakurai ◽  
Hideo Kameyama
Keyword(s):  
Activated Carbon ◽  
Ethyl Acetate ◽  
Fixed Bed ◽  
Gas Mixtures ◽  
Adsorption And Desorption

Dynamic Adsorption and Desorption of Toluene on Carbon Nanotubes Grafted Activated Carbon Fibers

2013 ◽  
Vol 284-287 ◽  
pp. 72-76 ◽  
Author(s):  
Yu Chun Chiang ◽  
Wei Hsiang Lin
Keyword(s):  
Carbon Nanotubes ◽  
Activated Carbon ◽  
Surface Area ◽  
Carbon Fibers ◽  
Physical Adsorption ◽  
Fixed Bed ◽  
Chemical Vapor Deposition Method ◽  
Active Surface Area ◽  
Activated Carbon Fibers ◽  
Adsorption And Desorption

Activated carbon fibers (ACFs) are widely used adsorbents due to their small fiber diameter, uniform pore size distribution and rapid adsorption/desorption rate. In addition, carbon nanotubes (CNTs) have received much attention recently because of their excellent mechanical and electrical properties and being candidates for adsorption. Thus, it should be highly interested as grafting CNTs onto ACFs to form a hybrid adsorbent. Therefore, the objective of this paper is to investigate the physicochemical properties of ACFs grafted with nitrogen-doped CNTs (CNs) and determine the adsorption and desorption performance of toluene vapor on this hybrid adsorbent. The chemical vapor deposition method was used for growth of CNs directly onto ACFs. The resulting materials were characterized by several techniques. Next, the adsorption breakthrough behaviors of toluene on the samples were measured in a continuous flow-type fixed-bed system. And then the temperature programmed desorption system was utilized to observe the desorption characteristics of toluene from the samples. Results show that the CNs have been grafted homogeneously onto the ACFs. The attachment of CNs on ACFs was believed to block part of the active surface area, causing the decrease in specific surface area and pore volume, but lead to the increase in microporosity. The adsorption of toluene on ACFs or the hybrid adsorbent was physical adsorption. At higher adsorption temperatures, the hybrid adsorbent could maintain high enough capacities of toluene and even exceed the performance of ACFs. Moreover, toluene could be desorbed completely from ACFs and the hybrid adsorbent up to 400 oC with the highest desorption efficiency at about 180 oC.

scholarly journals Adsorption and Desorption Performance and Mechanism of Tetracycline Hydrochloride by Activated Carbon-Based Adsorbents Derived from Sugar Cane Bagasse Activated with ZnCl2

Molecules ◽  
2019 ◽  
Vol 24 (24) ◽  
pp. 4534 ◽  
Author(s):  
Yixin Cai ◽  
Liming Liu ◽  
Huafeng Tian ◽  
Zhennai Yang ◽  
Xiaogang Luo
Keyword(s):  
Activated Carbon ◽  
Sugar Cane ◽  
Fixed Bed ◽  
Sugar Cane Bagasse ◽  
Tetracycline Hydrochloride ◽  
Bet Surface Area ◽  
Maximum Adsorption Capacity ◽  
Average Pore ◽  
Adsorption And Desorption ◽  
Carbon Based

Adsorption and desorption behaviors of tetracycline hydrochloride by activated carbon-based adsorbents derived from sugar cane bagasse modified with ZnCl2 were investigated. The activated carbon was tested by SEM, EDX, BET, XRD, FTIR, and XPS. This activated carbon exhibited a high BET surface area of 831 m2 g−1 with the average pore diameter and pore volume reaching 2.52 nm and 0.45 m3 g−1, respectively. The batch experimental results can be described by Freundlich equation, pseudo-second-order kinetics, and the intraparticle diffusion model, while the maximum adsorption capacity reached 239.6 mg g−1 under 318 K. The effects of flow rate, bed height, initial concentration, and temperature were studied in fixed bed adsorption experiments, and adsorption data were fitted with six dynamic adsorption models. The results of characterizations and the batch experiments were analyzed to study the adsorption and desorption mechanisms. Tetracycline hydrochloride and activated carbon were bonded together by π–π interactions and cation–π bonds. Ethanol was used as an eluent which bonded with 10 hydrogen bond acceptors on tetracycline hydrochloride to form a complex by hydrogen bonding to achieve recycling.

Effects of metal loading on activated carbon on its adsorption and desorption characteristics

2019 ◽  
Vol 74 ◽  
pp. 199-207 ◽  
Author(s):  
Ji Hye Park ◽  
Ra Hyun Hwang ◽  
Hyung Chul Yoon ◽  
Kwang Bok Yi
Keyword(s):  
Activated Carbon ◽  
Adsorption And Desorption ◽  
Metal Loading

scholarly journals Investigating the performance of agricultural wastes and their ashes in removing phenol from leachate in a fixed-bed column

2020 ◽  
Vol 81 (10) ◽  
pp. 2109-2126 ◽  
Author(s):  
Seyed Omid Ahmadinejad ◽  
Seyed Taghi Omid Naeeni ◽  
Zahra Akbari ◽  
Sara Nazif
Keyword(s):  
Activated Carbon ◽  
Large Scale ◽  
Fixed Bed ◽  
Walnut Shell ◽  
Continuous Systems ◽  
Phenol Removal ◽  
Adsorption Method ◽  
Fixed Bed Column ◽  
Saturation Time ◽  
Coconut Shell Activated Carbon

Abstract One of the major pollutants in leachate is phenol. Due to safety and environmental problems, removal of phenol from leachate is essential. Most of the adsorption studies have been conducted in batch systems. Practically, large-scale adsorption is carried out in continuous systems. In this research, the adsorption method has been used for phenol removal from leachate by using walnut shell activated carbon (WSA) and coconut shell activated carbon (CSA) as adsorbents in a fixed-bed column. The effect of adsorbent bed depth, influent phenol concentration and type of adsorbent on adsorption was explored. By increasing the depth of the adsorbent bed in the column, phenol removal efficiency and saturation time increase significantly. Also, by increasing the influent concentration, saturation time of the column decreases. To predict the column performance and describe the breakthrough curve, three kinetic models of Yon-Nelson, Adams-Bohart and Thomas were applied. The results of the experiments indicate that there is a good match between the results of the experiment and the predicted results of the models.

scholarly journals Catalytic Oxidation of 4-Hydroxybenzoic Acid on Activated Carbon in Batch Autoclave and Fixed-Bed Reactors

2007 ◽  
Vol 46 (25) ◽  
pp. 8388-8396 ◽  
Author(s):  
Carmen Creanga Manole ◽  
Carine Julcour-Lebigue ◽  
Anne-Marie Wilhelm ◽  
Henri Delmas
Keyword(s):  
Activated Carbon ◽  
Catalytic Oxidation ◽  
Fixed Bed ◽  
Hydroxybenzoic Acid ◽  
Fixed Bed Reactors

Ammonia adsorption in a fixed bed of activated carbon

2007 ◽  
Vol 98 (4) ◽  
pp. 886-891 ◽  
Author(s):  
C RODRIGUES ◽  
D DEMORAESJR ◽  
S DANOBREGA ◽  
M BARBOZA
Keyword(s):  
Activated Carbon ◽  
Fixed Bed ◽  
Ammonia Adsorption
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