scholarly journals Adsorption Equilibrium and Kinetics of the Removal of Ammoniacal Nitrogen by Zeolite X/Activated Carbon Composite Synthesized from Elutrilithe

2017 ◽  
Vol 2017 ◽  
pp. 1-9 ◽  
Author(s):  
Yong Zhang ◽  
Feng Yu ◽  
Wenping Cheng ◽  
Jiancheng Wang ◽  
Juanjuan Ma
Keyword(s):  
Activated Carbon ◽  
Adsorption Kinetics ◽  
Nitrogen Adsorption ◽  
Carbon Composite ◽  
Ammoniacal Nitrogen ◽  
Zeolite X ◽  
Carbon Composite Material ◽  
Equilibrium And Kinetics ◽  
Hydrothermal Transformation ◽  
Kinetics Of

Zeolite X/activated carbon composite material (X/AC) was prepared from elutrilithe, by a process consisting of carbonization, activation, and subsequent hydrothermal transformation of aluminosilicate in alkaline solution, which was used for the removal of ammoniacal nitrogen from aqueous solutions. Adsorption kinetics, equilibrium, and thermodynamic were studied and fitted by various models. The adsorption kinetics is best depicted by pseudosecond-order model, and the adsorption isotherm fits the Freundlich and Redlich-Peterson model. This explains the ammoniacal nitrogen adsorption onto X/AC which was chemical adsorption in nature. Thermodynamic properties such as ΔG, ΔH, and ΔS were determined for the ammoniacal nitrogen adsorption, and the positive enthalpy confirmed that the adsorption process was endothermic. It can be inferred that ammoniacal nitrogen removal by X/AC composite is attributed to the ion exchange ability of zeolite X. Further, as a novel sorbent, this material has the potential application in removing ammoniacal nitrogen coexisting with other organic compounds from industrial wastewater.

scholarly journals Equilibrium and Kinetics of CO2 Adsorption by Coconut Shell Activated Carbon Impregnated with Sodium Hydroxide

Processes ◽  
2021 ◽  
Vol 9 (2) ◽  
pp. 201
Author(s):  
Chaiyot Tangsathitkulchai ◽  
Suravit Naksusuk ◽  
Atichat Wongkoblap ◽  
Poomiwat Phadungbut ◽  
Prapassorn Borisut
Keyword(s):  
Activated Carbon ◽  
Sodium Hydroxide ◽  
Co2 Adsorption ◽  
Activated Carbons ◽  
Nitrogen Adsorption ◽  
Coconut Shell ◽  
Type I ◽  
Equilibrium And Kinetics ◽  
Coconut Shell Activated Carbon ◽  
Kinetics Of

The equilibrium and kinetics of CO2 adsorption at 273 K by coconut-shell activated carbon impregnated with sodium hydroxide (NaOH) was investigated. Based on nitrogen adsorption isotherms, porous properties of the tested activated carbons decreased with the increase of NaOH loading, with the decrease resulting primarily from the reduction of pore space available for nitrogen adsorption. Equilibrium isotherms of CO2 adsorption by activated carbons impregnated with NaOH at 273 K and the pressure up to 100 kPa displayed an initial part of Type I isotherm with most adsorption taking place in micropores in the range of 0.7–0.9 nm by pore-filling mechanisms. The amount of CO2 adsorbed increased with the increase of NaOH loading and passed through a maximum at the optimum NaOH loading of 180 mg/g. The CO2 isotherm data were best fitted with the three-parameter Sips equation, followed by Freundlich and Langmuir equations. The pore diffusion model, characterized by the effective pore diffusivity (De), could well describe the adsorption kinetics of CO2 in activated carbons impregnated with NaOH. The variation of De with the amount of CO2 adsorbed showed three consecutive regions, consisting of a rapid decrease of De for CO2 loading less than 40 mg/g, a relatively constant value of De for the CO2 loading of 40–80 mg/g and a slow decrease of De for the CO2 loading of 80–200 mg/g. The maximum De occurred at the optimum NaOH loading of 180 mg/g, in line with the equilibrium adsorption results. The values of De varied from 1.1 × 10−9 to 5.5 × 10−9 m2/s, which are about four orders of magnitude smaller than the molecular diffusion of CO2 in air. An empirical correlation was developed for predicting the effective pore diffusivity with the amount of CO2 adsorbed and NaOH loading.

Adsorption Equilibrium and Kinetics of CO2 and H2O on Activated Carbon

2012 ◽  
Vol 27 (2) ◽  
pp. 139-145 ◽  
Author(s):  
Dong XU ◽  
Jun ZHANG ◽  
Gang LI ◽  
Penny XIAO ◽  
Paul WEBLEY ◽  
...  
Keyword(s):  
Activated Carbon ◽  
Adsorption Equilibrium ◽  
Equilibrium And Kinetics ◽  
Adsorption Equilibrium And Kinetics ◽  
Kinetics Of

scholarly journals Adsorption kinetics of surfactants on activated carbon

2018 ◽  
Vol 349 ◽  
pp. 012001
Author(s):  
Arnelli ◽  
WP Aditama ◽  
Z Fikriani ◽  
Y Astuti
Keyword(s):  
Activated Carbon ◽  
Adsorption Kinetics ◽  
Kinetics Of

The adsorption kinetics of sodium dodecylbenzenesulfonate on activated carbon. Branched-pore diffusional model revisited and comparison with other diffusional models

2019 ◽  
Vol 207 (5) ◽  
pp. 705-721 ◽  
Author(s):  
R. Leyva-Ramos ◽  
R. Ocampo-Pérez ◽  
I. Bautista-Toledo ◽  
J. Rivera-Utrilla ◽  
N. A. Medellín-Castillo ◽  
...  
Keyword(s):  
Activated Carbon ◽  
Adsorption Kinetics ◽  
Sodium Dodecylbenzenesulfonate ◽  
Diffusional Model ◽  
Kinetics Of

Equilibrium and kinetics of adsorption of phosphate onto iron-doped activated carbon

2012 ◽  
Vol 19 (7) ◽  
pp. 2908-2917 ◽  
Author(s):  
Zhengfang Wang ◽  
Er Nie ◽  
Jihua Li ◽  
Mo Yang ◽  
Yongjun Zhao ◽  
...  
Keyword(s):  
Activated Carbon ◽  
Kinetics Of Adsorption ◽  
Iron Doped ◽  
Equilibrium And Kinetics ◽  
Kinetics Of
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