scholarly journals Simulations of breakthrough curves for fixed-bed column adsorption of Cobalt (II) ions on spent tea leaves

2020 ◽  
Author(s):  
Kibrewossen Tesfagiorgis ◽  
Abel E. Navarro ◽  
Bow Ming Chen ◽  
Nicholas Herrera ◽  
Joel Hernandez ◽  
...  
Keyword(s):  
Mathematical Models ◽  
High Surface ◽  
Fixed Bed ◽  
Surface Heterogeneity ◽  
Breakthrough Curves ◽  
Concentration Data ◽  
Residual Concentration ◽  
Fixed Bed Column ◽  
Natural Logarithm ◽  
Column Adsorption

Abstract The objective of this study is to model the breakthrough adsorption curves of Co (II) ions using spent tealeaves in fixed-bed column experiments. Spent leaves of green tea (GT), peppermint tea (PM) and chamomile (CM) were packed in glass columns with a diameter of 2 cm and height of 15 cm, and used as filters for the removal of the pollutant. Aqueous solutions of Cobalt (II) ions (100 mg/L) at pH 6 were prepared and pumped against gravity through the columns at a uniform flow rate of 5 mL/min. Breakthrough curves were fitted for the residual concentration data using the Thomas, Yoon-Nelson, and Clark models, with added empirical terms to delineate the lower tail of the breakthrough curve. These mathematical models were successfully linearized using the natural logarithm for parameter estimation. The results reveal that the Co (II) adsorption fits all three models for all the adsorbents. The Thomas model indicated that the calculated adsorption capacities followed the trend: PM > GT > CM with values of 59.7, 25.2, and 24.9 mg/g respectively. Moreover, CM showed the highest adsorption rates with all the mathematical models, whereas Yoon-Nelson theory provided evidence that PM has the longest 50% adsorption breakthrough among the adsorbents. Lastly, morphological and textural studies indicate that all spent leaves are good candidates as adsorbents due to their high surface heterogeneity. This study proposes the use of spent tealeaves as Co (II) adsorbents because they are inexpensive and environmentally beneficial.

Adsorption of chloro-anilines from solution by modified peanut husk in fixed-bed column

2013 ◽  
Vol 68 (10) ◽  
pp. 2158-2163 ◽  
Author(s):  
Shenglong Zhang ◽  
Randi Zhang ◽  
Wei Xiao ◽  
Runping Han
Keyword(s):  
Flow Rate ◽  
Low Cost ◽  
Fixed Bed ◽  
Breakthrough Curves ◽  
Ammonium Bromide ◽  
Spectroscopy Analysis ◽  
Time Model ◽  
Fixed Bed Column ◽  
Column Adsorption ◽  
Critical Bed Depth

Natural peanut husk (NPH) modified with hexadecyl trimethyl ammonium bromide (CTAB) was used as adsorbent to remove 2,5-dimethoxy-4-chloroaniline (DMCH) from solution in a fixed-bed column. Fourier transform infrared spectroscopy analysis and X-ray fluorescence of NPH and modified peanut husk (MPH) showed that CTAB had been introduced onto the surface of NPH. The effects of flow rate and bed depth on breakthrough curves were studied. The Thomas model and the Yan model were selected to fit the column adsorption data and the results showed that the Yan model was better at predicting the breakthrough curves. The adsorption quantity was up to 6.46 mg/g according to the Yan model. The bed depth service time model was used to calculate the critical bed depth from experimental data and it was directly related to flow rate. As a low-cost adsorbent, MPH is promising for the removal of DMCH from solution.

Modeling of chromium (VI) adsorption from aqueous solutions using Jordanian Zeolitic Tuff

2017 ◽  
Vol 75 (9) ◽  
pp. 2064-2071 ◽  
Author(s):  
Reyad Al Dwairi
Keyword(s):  
Adsorption Capacity ◽  
High Surface ◽  
High Surface Area ◽  
Fixed Bed ◽  
Size Fraction ◽  
Breakthrough Curves ◽  
Zeolitic Tuff ◽  
Fixed Bed Column ◽  
Grain Sizes ◽  
Chromium Vi

The probable use of Jordanian natural zeolitic tuff in wastewater treatment as natural adsorbent for the removal of Cr (VI) ions from aqueous solution in continuous fixed bed columns was tested experimentally and theoretically. The tested zeolitic tuff was obtained from Al Hala volcano (HZ) located in southern part of Jordan and subjected to crushing and sieving only without any further treatment. Experimentally the HZ grains were packed in a fixed bed column. The used grain sizes are HZ1 (1.0–0.60 mm) and HZ2 (0.60–0.30 mm). The adsorption capacity was evaluated using breakthrough curves and by applying the Thomas and Yoon and Nelson models. The Thomas model analysis of the measured breakthrough curves revealed that the adsorbent HZ2 has a higher adsorption capacity to Cr (VI) ions (56.3 mg/g) than HZ1 (35.5 mg/g). The time elapsed to reach 50% breakthrough was determined by the Yoon and Nelson model. The time to reach 50% breakthrough is 318.78 min and 368.18 min for HZ1 and HZ2, respectively. The research results indicate that the small size fraction (HZ2) is more suitable and effective as adsorbent material than the size fraction (HZ1) due to its high surface area.

scholarly journals FIXED-BED COLUMN ADSORPTION OF ARSENIC(V) BY POROUS COMPOSITE OF MAGNETITE/HEMATITE/CARBON WITH EUCALYPTUS WOOD MICROSTRUCTURE

2018 ◽  
Vol 26 (1) ◽  
pp. 38-56 ◽  
Author(s):  
Yanhong LI ◽  
Yinian ZHU ◽  
Zongqiang ZHU ◽  
Xuehong ZHANG ◽  
Dunqiu WANG ◽  
...  
Keyword(s):  
Grain Size ◽  
Iron Oxides ◽  
Operating Temperature ◽  
Fixed Bed ◽  
Breakthrough Curves ◽  
Porous Composite ◽  
Fixed Bed Column ◽  
Eucalyptus Wood ◽  
Column Adsorption ◽  
Adsorption Desorption

The fixed-bed column adsorption-desorption of As(V) by the porous composite of iron oxides and carbon with eucalyptus wood hierarchical microstructure (PC-Fe/C) was experimentally studied. The increase in the influent As(V) concentration and the inflow rate resulted in an earlier exhaustion of the column. The breakthrough curves indicated that a larger adsorbent mass, a smaller adsorbent grain size and a lower influent pH prolonged the column life span. The operating temperature had negligible effect. All breakthrough curves could be well fitted with the Thomas and Yoon–Nelson models. Under the condition of the influent flow rate of 5.136 mL/min, the influent As(V) concentration of 20 mg/L, the influent pH of 3, the adsorbent mass of 2 g, the adsorbent grain size of <100 mesh, and the operating temperature of 35 °C, the equilibrium adsorption capacity reached 10.49 mg/g, which was greater than those of natural/synthetic iron oxides adsorbents and iron-oxide-coated adsorbents.

Biochar caged zirconium ferrite nanocomposites for the adsorptive removal of Reactive Blue 19 dye in a batch and column reactors and conditions optimizaton

2021 ◽  
Vol 0 (0) ◽  
Author(s):  
Shazia Perveen ◽  
Raziya Nadeem ◽  
Shaukat Ali ◽  
Yasir Jamil
Keyword(s):  
Experimental Data ◽  
Low Dose ◽  
Fixed Bed ◽  
Breakthrough Curves ◽  
Adsorption Efficiency ◽  
Fixed Bed Column ◽  
Flow Rates ◽  
Adsorptive Removal ◽  
Reactive Blue 19 ◽  
Pseudo Second Order

Abstract Biochar caged zirconium ferrite (BC-ZrFe2O5) nanocomposites were fabricated and their adsorption capacity for Reactive Blue 19 (RB19) dye was evaluated in a fixed-bed column and batch sorption mode. The adsorption of dye onto BC-ZrFe2O5 NCs followed pseudo-second-order kinetics (R 2 = 0.998) and among isotherms, the experimental data was best fitted to Sips model as compared to Freundlich and Langmuir isotherms models. The influence of flow-rate (3–5 mL min−1), inlet RB19 dye concentration (20–100 mg L−1) and quantity of BC-ZrFe2O5 NCs (0.5–1.5 g) on fixed-bed sorption was elucidated by Box-Behnken experimental design. The saturation times (C t /C o  = 0.95) and breakthrough (C t /C o  = 0.05) were higher at lower flow-rates and higher dose of BC-ZrFe2O5 NCs. The saturation times decreased, but breakthrough was increased with the initial RB19 dye concentration. The treated volume was higher at low sorbent dose and influent concentration. Fractional bed utilization (FBU) increased with RB19 dye concentration and flow rates at low dose of BC-ZrFe2O5 NCs. Yan model was fitted best to breakthrough curves data as compared to Bohart-Adams and Thomas models. Results revealed that BC-ZrFe2O5 nanocomposite has promising adsorption efficiency and could be used for the adsorption of dyes from textile effluents.

Analysis of Fixed-Bed Column Adsorption of Reactive Yellow 176 onto Surfactant-Modified Zeolite

2008 ◽  
Vol 47 (18) ◽  
pp. 6999-7004 ◽  
Author(s):  
Ayşegul Faki ◽  
Mustafa Turan ◽  
Ozgur Ozdemir ◽  
Abdullah Zahid Turan
Keyword(s):  
Fixed Bed ◽  
Fixed Bed Column ◽  
Modified Zeolite ◽  
Column Adsorption

Fixed bed column adsorption of vanadium from water using amino-functional polymeric adsorbent

2021 ◽  
Vol 209 ◽  
pp. 280-288
Author(s):  
Serdar Aydın ◽  
Hamda Mowlid Nur ◽  
Abdoulaye Mamadou Traore ◽  
Eren Yıldırım ◽  
Serkan Emik
Keyword(s):  
Fixed Bed ◽  
Fixed Bed Column ◽  
Polymeric Adsorbent ◽  
Column Adsorption

Adsorption of Methylene Blue from Solution by Natural Zeolite in Fixed-Bed Column: Effect of Bed Depth

2012 ◽  
Vol 518-523 ◽  
pp. 3115-3119
Author(s):  
Yan Qiang Li ◽  
Xiao Feng Ren ◽  
Shao Hua Chen ◽  
Xiu Rong Zhao ◽  
Run Ping Han
Keyword(s):  
Methylene Blue ◽  
Natural Zeolite ◽  
Fixed Bed ◽  
Breakthrough Curves ◽  
Form Solution ◽  
Column Height ◽  
Nonlinear Regression Analysis ◽  
Adsorption Ability ◽  
Fixed Bed Column ◽  
Linear And Nonlinear

The effect of bed depth on adsorption ability of natural zeolite to removal methylene blue (MB) from aqueous solution in the fixed-bed column was studied. The results showed that the increase in column height favored the MB removal form solution. The equilibrium uptake of MB onto unit mass zeolite increased with the bed depth growth. The experimental data were fitted to Yan model using linear and nonlinear regression analysis, respectively. The experimental points and the predicted curves using the Yan model were compared and the error analysis was performed. The results indicated that Yan model were good to predict the breakthrough curves and both two methods can be used to obtain the parameters of Yan model and to predict the breakthrough curves.

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