scholarly journals BIOCHAR PECAN NUTSHELL VIA PYROLYSIS FOR USE AS AN ADSORBENT: AN APPLIED STUDY FOR THE REMOVAL OF HEXAVALENT CHROMIUM

2020 ◽  
Vol 50 (3) ◽  
pp. 203-208
Author(s):  
A. B. Ferreira ◽  
A.L. Baierle ◽  
M.A. Zazycki ◽  
D. Perondi ◽  
M. Godinho ◽  
...  
Keyword(s):  
Surface Layer ◽  
Aqueous Solutions ◽  
Adsorption Kinetics ◽  
Adsorption Process ◽  
Adsorption Equilibrium ◽  
Pyrolysis Process ◽  
Applied Study ◽  
Pecan Nutshell ◽  
Kinetics Of ◽  
Maximum Removal

The pyrolysis process was used for the production of biochar and carried out a study for removal of Cr (VI) in aqueous solutions. The maximum removal reached was 94 % for a Cr (VI) solution at 50 mg L-1. The Elovich model described very well the adsorption kinetics of Cr (VI) on the biochar and the adsorption equilibrium was described by Sips model. This suggests that adsorption of Cr (VI) onto biochar was controlled by chemisorption and the biochar was covered by the surface layer of the Cr (VI). The thermodynamic parameters showed that this adsorption process was spontaneous, favorable and exothermic. The results of this study show that this adsorbent material prepared by pyrolysis has a good response when applied to the removal of Cr (VI) in aqueous solutions.

Study on the Formaldehyde Adsorption Kinetics of Dry Waters

2014 ◽  
Vol 809-810 ◽  
pp. 907-911
Author(s):  
Jun Long Wang ◽  
Jie Hou ◽  
Ting Jiang ◽  
Yong Jun He ◽  
Yao Dong Liang
Keyword(s):  
Adsorption Kinetics ◽  
High Speed ◽  
Adsorption Process ◽  
Average Diameter ◽  
Adsorption Rate ◽  
Absorption Kinetics ◽  
Order Model ◽  
Pseudo Second Order ◽  
Kinetics Of ◽  
Formaldehyde Adsorption

Dry waters with an average diameter of 82 μm were prepared by a high speed mixed route. The formaldehyde absorption kinetics of dry waters was investigated by simulating indoor formaldehyde pollution in glass chamber. The results showed that pseudo-second order model could be used to simulate the adsorption process; the adsorption rate was highest in the initial 60 minutes; when the adsorption lasted for 180 minutes, the adsorption reached equilibrium.

Adsorption kinetics of maxilon blue GRL onto sepiolite from aqueous solutions

2006 ◽  
Vol 124 (1-3) ◽  
pp. 89-101 ◽  
Author(s):  
Mehmet Doğan ◽  
Mahir Alkan ◽  
Özkan Demirbaş ◽  
Yasemin Özdemir ◽  
Cengiz Özmetin
Keyword(s):  
Aqueous Solutions ◽  
Adsorption Kinetics ◽  
Kinetics Of

Adsorption Kinetics of Nonanol at the Air−Water Interface:  Considering Molecular Interaction or Aggregation within Surface Layer

Langmuir ◽  
2002 ◽  
Vol 18 (7) ◽  
pp. 2686-2692 ◽  
Author(s):  
Ya-Chi Lee ◽  
Yu-Bing Liou ◽  
Reinhard Miller ◽  
Hwai-Shen Liu ◽  
Shi-Yow Lin
Keyword(s):  
Surface Layer ◽  
Adsorption Kinetics ◽  
Molecular Interaction ◽  
Water Interface ◽  
Air Water Interface ◽  
Kinetics Of

Adsorption Equilibrium and Kinetics of Copper from Aqueous Solutions on Steel Slag

2011 ◽  
Vol 354-355 ◽  
pp. 33-36
Author(s):  
Jian Yun Li ◽  
Quan Xian Hua ◽  
Jun Ling Niu ◽  
Jian Wei Tang ◽  
Ke Xu
Keyword(s):  
Aqueous Solutions ◽  
Adsorption Equilibrium ◽  
Steel Slag ◽  
Adsorption Rate ◽  
Batch Adsorption ◽  
Equilibrium And Kinetics ◽  
Equilibrium Data ◽  
Pseudo Second Order ◽  
Adsorption Equilibrium Data ◽  
Kinetics Of

The adsorption of copper in aqueous solutions by steel slag was studied in batch adsorption experiments. The adsorption equilibrium data fitted best with Langmuir and Freundlich equations. The adsorption was preferential type. A comparison of the kinetics models on the apparent adsorption rate showed that the adsorption system was best described by the pseudo-second-order kinetics. The adsorption rate was controlled by both liquid film diffusion and intraparticle dispersion.

Adsorption Kinetics of Methylene Blue from Aqueous Solutions onto Palygorskite

2010 ◽  
Vol 80 (2) ◽  
pp. 236-242 ◽  
Author(s):  
PENG Shuchuan ◽  
WANG Shisheng ◽  
CHEN Tianhu ◽  
JIANG Shaotong ◽  
HUANG Chuanhui
Keyword(s):  
Methylene Blue ◽  
Aqueous Solutions ◽  
Adsorption Kinetics ◽  
Kinetics Of

Kinetic Process of Purple Cabbage Pigment on Macro Porous Absorbent Resin

2011 ◽  
Vol 236-238 ◽  
pp. 1987-1990
Author(s):  
Jian Hua Yi ◽  
Zhen Bao Zhu ◽  
Yuan Fang Wu
Keyword(s):  
Free Energy ◽  
Gibbs Free Energy ◽  
Adsorption Kinetics ◽  
Temperature Increase ◽  
Adsorption Process ◽  
Adsorbent Resin ◽  
Temperature Range ◽  
Porous Adsorbent ◽  
Kinetics Of ◽  
Langmuir And Freundlich Models

The adsorption kinetics of purple cabbage pigment (PCP) on LSA-21 macro porous adsorbent resin were studied at different adsorbent resin concentrations (1, 2, 4, 8 g adsorbent resin per liter of purple cabbage extraction solution) for the temperature range of 20~50°C. The results showed that the adsorption of PCP in purple cabbage extraction solution onto LSA-21 macro porous adsorbent resin is highly in agreement with both Langmuir and Freundlich models. Heat of adsorption (ΔH) value of 11.976 kJ/mol indicates the endothermic adsorption process. A decrease of Gibbs free energy (ΔG) with temperature increase also indicates the spontaneous nature of the process.

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