scholarly journals Equilibrium, isotherms and kinetic studies of uranium sorption onto AlPO 4 -5 and SAPO-5 materials

2021 ◽  
Vol 24 (2) ◽  
pp. 373-384
Author(s):  
Naima Bayou ◽  
Hamid Aït-Amar ◽  
Samir Belkhiri ◽  
Zohra Bouhila ◽  
Fatima Houhoune ◽  
...  
Keyword(s):  
Kinetic Studies ◽  
Equilibrium Isotherms

Adsorption of Copper(II) Onto Chitosan Alpha-Ketoglutaric Acid: Equilibrium Isotherms, Kinetic Studies and Optimization

2016 ◽  
Vol 13 (1) ◽  
pp. 148-155
Author(s):  
Cuimei Chen ◽  
Xiaohua Ma ◽  
Fei Yang ◽  
Yong Xia ◽  
Weng Xiao ◽  
...  
Keyword(s):  
Kinetic Studies ◽  
Equilibrium Isotherms

Biopolymeric Adsorbent for the Removal of Methylene Blue: Characterizations, Equilibrium Isotherms and Kinetic Studies

2015 ◽  
Vol 1125 ◽  
pp. 281-285
Author(s):  
Siti Aishah Muhmed ◽  
Mohd Ghazali Mohd Nawawi
Keyword(s):  
Methylene Blue ◽  
Adsorption Capacity ◽  
Correlation Coefficient ◽  
Kinetic Studies ◽  
Second Order ◽  
Equilibrium Isotherms ◽  
Chi Square ◽  
Initial Concentration ◽  
Adsorbent Dosage ◽  
Pseudo Second Order

Crosslinked Sago Starch (CSS) was prepared by crosslinking native starch with Sodium Trimetaphosphate. As a biodegradable adsorbent, CSS was used to remove methylene blue (MB) from the aqueous solution based on its characterization, including the granule morphology, crystalline nature and molecular structure. The adsorption capacity of CSS was evaluated as a function of pH, adsorbent dosage, initial concentration and time. It was favorable for adsorption under condition of neutral and at high initial concentration. The adsorption capacity trend was decreased with increasing the adsorbent dosage. The equilibrium isotherms were conducted using Langmuir, Freundlich and Tempkin model. It has been demonstrated that the better agreement was Langmuir isotherm with correlation coefficient of 0.99, equilibrium adsorption capacity of 3.75 mg g-1, chi-square test, χ2 of 0.03% and corresponding contact time of 4 hours. The pseudo-first-order, pseudo-second-order and intra-particle diffusion were used to fit adsorption data in the kinetic studies. And results showed that the adsorption kinetics was more accurately described by the pseudo-second-order model with correlation coefficient, R2 of 0.99 and standard deviation, SSE of 0.12%. The obtained results suggest that CSS could be promising candidates as an adsorbent for dye removal.

Adsorption of Malachite Green by Diatomite: Equilibrium Isotherms and Kinetic Studies

2015 ◽  
Vol 37 (7) ◽  
pp. 1059-1066 ◽  
Author(s):  
Lijie Tian ◽  
Jian Zhang ◽  
Haiqiang Shi ◽  
Na Li ◽  
Qingwei Ping
Keyword(s):  
Malachite Green ◽  
Kinetic Studies ◽  
Equilibrium Isotherms

scholarly journals Adsorption isotherm, kinetic and mechanism studies of 2-nitrophenol on sedimentary phosphate

2015 ◽  
Vol 4 (6) ◽  
pp. 289-296 ◽  
Author(s):  
Hind Yaacoubi ◽  
Zuo Songlin ◽  
Mustapha Mouflih ◽  
Mina Gourai ◽  
Said Sebti
Keyword(s):  
Kinetic Studies ◽  
Intraparticle Diffusion ◽  
X Ray Diffraction ◽  
Equilibrium Isotherms ◽  
X Ray ◽  
First Order ◽  
Adsorption Data ◽  
Pseudo Second Order ◽  
Pseudo First Order ◽  
Equilibrium Adsorption Capacity

Sedimentary phosphate (SP) was used as an adsorbent for the removal of 2-nitrophenol from aqueous solutions in an attempt to investigate (the feasibility of) its application (to) in wastewater purification.  The adsorbent was characterized by X-ray diffraction (XRD), IR spectroscopy, Fluorescence X and BET.  The results indicated that the SP (was) is francolite (Ca10 (PO4,CO3)6F2) and mesoporous. The effect of the adsorption time and the pH of the solution were studied. The pseudo-first-order, pseudo-second-order and intraparticle diffusion models were used to fit adsorption data in the kinetic studies. The equilibrium isotherms were determined using the Langmuir, Freundlich and Dubinin-Radushkevich models. The results show that the Dubinin-Radushkevich isotherm had better agreement with the 2-nitrophenol adsorption on SP with a correlation coefficient of 0.98, an equilibrium adsorption capacity of 633 mg. g-1 and a corresponding contact time of 2 h. The results imply that intraparticle diffusion could be summarized as the basic rate-controlling mechanisms during 2-nitrophenol adsorption on SP.

scholarly journals Copper, nickel and zinc removal by peanut hulls: batch and column studies in mono, tri-component systems and with real effluent

2013 ◽  
Vol 12 (2) ◽  
pp. 206-214 ◽  
Keyword(s):  
Ph Value ◽  
Industrial Effluent ◽  
Chemical Characterization ◽  
Kinetic Studies ◽  
Equilibrium Isotherms ◽  
Column Studies ◽  
Peanut Hulls ◽  
Component Systems ◽  
Pseudo Second Order

The main goal of this research study was the removal of Cu(II), Ni(II) and Zn(II) from aqueous solutions using peanut hulls. This work was mainly focused on the following aspects: chemical characterization of the biosorbent, kinetic studies, study of the pH influence in mono-component systems, equilibrium isotherms and column studies, both in mono and tri-component systems, and with a real industrial effluent from the electroplating industry. The chemical characterization of peanut hulls showed a high cellulose (44.8%) and lignin (36.1%) content, which favours biosorption of metal cations. The kinetic studies performed indicate that most of the sorption occurs in the first 30 min for all systems. In general, a pseudo-second order kinetics was followed, both in mono and tri-component systems. The equilibrium isotherms were better described by Freundlich model in all systems. Peanut hulls showed higher affinity for copper than for nickel and zinc when they are both present. The pH value between 5 and 6 was the most favourable for all systems. The sorbent capacity in column was 0.028 and 0.025 mmol g-1 for copper, respectively in mono and tri-component systems. A decrease of capacity for copper (50%) was observed when dealing with the real effluent. The Yoon-Nelson, Thomas and Yan’s models were fitted to the experimental data, being the latter the best fit.

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