Performance of CaX Zeolite for Separation of C2H6, C2H4, and CH4by Adsorption Process; Capacity, Selectivity, and Dynamic Adsorption Measurements

2010 ◽  
Vol 46 (2) ◽  
pp. 349-355 ◽  
Author(s):  
S. Hosseinpour ◽  
S. Fatemi ◽  
Y. Mortazavi ◽  
M. Gholamhoseini ◽  
M. Takht Ravanchi
Keyword(s):  
Adsorption Process ◽  
Dynamic Adsorption

As(III) removal by Fe(III)-amidoximated PAN in the presence of H2O2 through simultaneous oxidation and adsorption

2019 ◽  
Vol 20 (2) ◽  
pp. 565-573
Author(s):  
Luyao Gao ◽  
Mengna Hao ◽  
Fanling Bu ◽  
Chunnuan Ji ◽  
Rongjun Qu ◽  
...  
Keyword(s):  
Adsorption Process ◽  
Arsenic Removal ◽  
Ph Value ◽  
Dynamic Adsorption ◽  
Optimal Conditions ◽  
Efficient Removal ◽  
Simultaneous Oxidation ◽  
Simulated Groundwater ◽  
Ph Range ◽  
Short Time

Abstract This study explored the efficient removal of As(III) by Fe(III)-amidoximated PAN (Fe(III) AO PAN) in the presence of H2O2 through simultaneous oxidation and adsorption. It presented that As(III) could be oxidized to As(V) efficiently in the pH range 3–9 within a short time. At the same time, the oxidized As(V) was adsorbed by Fe(III)-AO PAN. The effect of pH value, H2O2 concentration, Fe(III)-AO PAN amount, and coexisting anions on the As(III) oxidation and removal were investigated in detail. Dynamic adsorption on fixed column was also studied. Arsenic removal efficiency including As(III) and As(V) could be achieved (95.2%) by the simultaneous oxidation and adsorption process at the following optimal conditions: pH = 6.5, dosage of Fe(III)-AO PAN = 2.5 g/L, H2O2 = 100 mg/L, initial concentration of As(III) = 5 mg/L. Dynamic adsorption on fixed column demonstrated that As(III) in simulated groundwater could be efficiently removed from 500μg/L to <10 μg/L within 130 bed volumes (BV).

Dynamic Adsorption of Cr (VI) Ions from Aqueous Solution by Canna Edulis Ker Residue in a Fixed-Bed Column

2013 ◽  
Vol 743-744 ◽  
pp. 498-503
Author(s):  
Shan Lin ◽  
Yu Dong Lu ◽  
Xiao Xuan Lin ◽  
Zong Hua Wu
Keyword(s):  
Aqueous Solution ◽  
Adsorption Process ◽  
Ph Value ◽  
Fixed Bed ◽  
Correlation Coefficients ◽  
Dynamic Adsorption ◽  
Characteristic Parameters ◽  
Breakthrough Time ◽  
Fixed Bed Column ◽  
Continuous Dynamic

A continuous dynamic adsorption in a fixed-bed column was studied by canna edulis ker residue (CEKR) as an adsorbent for the removal of Cr (VI) ions from aqueous solution. The dynamic adsorption process was simulated by some mathematic models, to determine the characteristic parameters of the column. The results indicated that CEKR could effectively absorb Cr (VI) ions from aqueous solution. Breakthrough time reaching saturation increased significantly with the increase of the temperature, while the bed depth increased and the pH value decreased. In comparison, the initial metal concentration is able to slightly affect the adsorption. Some mathematical models could calculate the rate constants, correlation coefficients, the equilibrium adsorption and kinetic parameters, however, they were not suitable for the description the dynamic adsorption of Cr (VI) ions in the fixed-bed column.

Adsorptive removal of methylene blue by CuO-acid modified sepiolite as effective adsorbent and its regeneration with high-temperature gas stream

2016 ◽  
Vol 74 (4) ◽  
pp. 844-851
Author(s):  
Chengyuan Su ◽  
Liang Wang ◽  
Menglin Chen ◽  
Zhi Huang ◽  
Xiangfeng Lin
Keyword(s):  
Methylene Blue ◽  
High Temperature ◽  
Adsorption Process ◽  
Space Velocity ◽  
Column Height ◽  
Blue Dye ◽  
Dynamic Adsorption ◽  
Regeneration Time ◽  
Langmuir Isotherm Model ◽  
High Temperature Gas

In this study, the dynamic adsorption of methylene blue dye onto CuO-acid modified sepiolite was investigated. Meanwhile, the equilibrium and kinetic data of the adsorption process were studied to understand the adsorption mechanism. Furthermore, a high-temperature gas stream was applied to regenerate the adsorbent. The results showed that the Langmuir isotherm model was applied to describe the adsorption process. The positive value of enthalpy change indicated that the adsorption process was endothermic in nature. In the dynamic adsorption process, the best adsorption performance was achieved when the ratio of column height to diameter was 2.56 and the treatment capacity was 6 BV/h. The optimal scenario for regeneration experiments was the regeneration temperature of 550–650 °C, the space velocity of 100 min−1 and the regeneration time of 10 min. The effective adsorption of CuO-acid modified sepiolite was kept for 12 cycles of adsorption and regeneration.

The Effect of Anionic Sorption on the Metakaolinite

2010 ◽  
Vol 660-661 ◽  
pp. 1015-1018
Author(s):  
Valquiria Campos ◽  
Leandro C. Morais ◽  
André H. Rosa ◽  
Leonardo F. Fraceto ◽  
Pedro M. Büchler
Keyword(s):  
Experimental Data ◽  
Thermal Analysis ◽  
Thermal Activation ◽  
Laboratory Experiments ◽  
Adsorption Process ◽  
Arsenic Removal ◽  
Amorphous Material ◽  
Dynamic Adsorption ◽  
Thermal Pretreatment ◽  
Lattice Water

This paper reports an investigation on the effect of thermal activation of kaolinite. It is well known that during calcinations (400–650°C), kaolinite loses the OH lattice water and is transformed into metakaolinite or amorphous material. Arsenic is trace element that is toxic to animals including humans. The adsorption of arsenic on kaolinite was investigated at varying pH and thermal pretreatment. Calcination of sample is carried out at 650 °C for 3 h. The decomposition of kaolinite is recorded using methods of thermal analysis. The resultant product is identified by XRD. Laboratory experiments were conducted examining the effect of arsenic by thermally modified kaolinite. The Langmuir isotherm was used to describe arsenite and arsenate sorption by the calcined kaolinite. The equilibrium parameters used were based on experimental data obtained for the dynamic adsorption process of arsenic. Removal of arsenate using natural kaolinite was satisfactory, whereas arsenic was not removed by adsorption with thermally modified kaolinite. Moreover, the adsorption of arsenic by kaolinite and metakaolinite decreases with increasing pH.

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