scholarly journals Uranium Dynamic Adsorption Breakthrough Curve onto Rice Straw Based Activated Carbon Using Bed Depth Service Time Model

BioResources ◽  
2018 ◽  
Vol 13 (4) ◽  
Author(s):  
Sobhy Mostafa Ebrahim Yakout ◽  
Ahmed Abdelsattar Abdeltawab ◽  
Khalid Elhindi ◽  
Ahmed Askalany
Keyword(s):  
Activated Carbon ◽  
Rice Straw ◽  
Service Time ◽  
Breakthrough Curve ◽  
Dynamic Adsorption ◽  
Time Model ◽  
Bed Depth Service Time

Continuous Fixed-Bed Column Studies of Textile Effluent Treatment using Multi-Walled Carbon Nanotubes Originated from Rosmarinus officinalis Oil

2022 ◽  
Vol 10 (4) ◽  
pp. 22-30
Author(s):  
S. Valliammai ◽  
K. Gopal ◽  
R. Nithya ◽  
L. Rama Priya ◽  
D. Kavitha
Keyword(s):  
Electron Microscopy ◽  
Carbon Nanotubes ◽  
Service Time ◽  
Fixed Bed ◽  
Rosmarinus Officinalis ◽  
Time Model ◽  
Fixed Bed Column ◽  
Multi Walled Carbon Nanotubes ◽  
Walled Carbon Nanotubes ◽  
Bed Depth Service Time

A continuous adsorption study in a fixed-bed column was carried out using Multi-walled Carbon Nanotubes derived from Rosmarinus officinalis oil as an adsorbent for removing the textile dye Acid blue 40 from an aqueous solution. The adsorbent, MWNTs were prepared from Rosmarinus officinalis oil as a precursor to Fe/Mo catalyst supported on silica at 650 ºC under N2 atmosphere by spray pyrolysis process characterized by scanning electron microscopy, Transmission Electron microscopy, and Raman spectroscopy. The effects of adsorbent bed height (2–6 cm), initial ion concentration (20– 60 mg/L), and flow rate (10–30 mL/min) on the column performance were analyzed. The breakthrough curve was analyzed using the mathematical models of Thomas, Yoon-Nelson, and bed depth service time. The Thomas model at different conditions defined the behaviors of the breakthrough curves. The bed depth service time model showed good agreement with the experimental data. The high values of correlation coefficients (R2 0.9875) obtained indicate the validity of the bed depth service time model for the present column system.

scholarly journals Study of a fixed-bed column in the adsorption of an azo dye from an aqueous medium using a chitosan–glutaraldehyde biosorbent

2017 ◽  
Vol 36 (1-2) ◽  
pp. 215-232 ◽  
Author(s):  
Jaime López-Cervantes ◽  
Dalia I Sánchez-Machado ◽  
Reyna G Sánchez-Duarte ◽  
Ma A Correa-Murrieta
Keyword(s):  
Flow Rate ◽  
Service Time ◽  
Fixed Bed ◽  
Textile Dye ◽  
Time Model ◽  
Fixed Bed Column ◽  
Bed Height ◽  
Direct Blue ◽  
Direct Blue 71 ◽  
Bed Depth Service Time

A continuous adsorption study in a fixed-bed column was carried out using a chitosan–glutaraldehyde biosorbent for the removal of the textile dye Direct Blue 71 from an aqueous solution. The biosorbent was prepared from shrimp shells and characterized by scanning electron microscopy, X-ray diffraction, and nuclear magnetic resonance spectroscopy. The effects of chitosan–glutaraldehyde bed height (3–12 cm), inlet Direct Blue 71 concentration (15–50 mg l−1), and feed flow rate (1–3 ml min−1) on the column performance were analyzed. The highest bed capacity of 343.59 mg Direct Blue 71 per gram of chitosan–glutaraldehyde adsorbent was obtained using 1 ml min−1 flow rate, 50 mg l−1 inlet Direct Blue 71 concentration, and 3 cm bed height. The breakthrough curve was analyzed using the Adams–Bohart, Thomas, and bed depth service time mathematical models. The behaviors of the breakthrough curves were defined by the Thomas model at different conditions. The bed depth service time model showed good agreement with the experimental data, and the high values of correlation coefficients (R2 ≥ 0.9646) obtained indicate the validity of the bed depth service time model for the present column system.

Experimental Studies on the Treatment of Aniline Wasterwater by Activated Carbon Fiber

2011 ◽  
Vol 282-283 ◽  
pp. 64-67
Author(s):  
Bing Tao Liu ◽  
Ying Qi Yang ◽  
Li Zhang
Keyword(s):  
Activated Carbon ◽  
Carbon Fiber ◽  
Breakthrough Curve ◽  
Ph Value ◽  
Experimental Studies ◽  
Activated Carbon Fiber ◽  
Dynamic Adsorption ◽  
Dynamic Conditions ◽  
Adsorption Capacities ◽  
Initial Penetration

Activated Carbon Fiber was use to treat aniline wastewater. Influencing factors，such as pH value ，salinity were studied and dynamic conditions of concentration and flow adsorption effects were also studied. Adsorption isotherm, dynamic curves and dynamic adsorption breakthrough curve were drawn. The results indicated that the salinity of the solution will affect the adsorption results and concentration in the same circumstances, time was 9 min, pH neutral in better conditions adsorption, adsorption capacities were determined to be 72 mg/g .Under dynamic conditions，with increasing concentration and velocity, the initial penetration point ahead．

Competitive removal of dissolved organic carbon by adsorption and biodegradation on biological activated carbon

1997 ◽  
Vol 35 (7) ◽  
pp. 147-153 ◽  
Author(s):  
Woo Hang Kim ◽  
Wataru Nishijima ◽  
Eiji Shoto ◽  
Mitsumasa Okada
Keyword(s):  
Activated Carbon ◽  
Organic Carbon ◽  
Dissolved Organic Carbon ◽  
Service Time ◽  
Breakthrough Curve ◽  
Biological Activated Carbon ◽  
The Right

Improvement of biodegradability of dissolved organic carbon (DOC) by ozonation does not always induce improvement of DOC removal and extension of activated carbon service time, because most of biodegradable DOC increased by ozonation is adsorbable on activated carbon. The objective of this study is to clarify the fate of the biodegradable DOC increased by preozonation on biological activated carbon (BAC) and to evaluate effects of preozonation on BAC performance for the removal of DOC and extension of activated carbon service time. DOC breakthrough curve for BAC process obviously shifted to the right by combination with ozonation, indicating that preozonation extended BAC service time. Higher removal of DOC was noted in the ozone-BAC process than the BAC process after saturation with DOC. Ozonation increased biodegradable DOC by 2.89 mg·l−1 (31%). Although the increased biodegradable DOC had possibilities to be removed both by adsorption and biodegradation, most of it was removed by biodegradation on BAC which resulted in longer BAC service time. Biodegradation of the increased biodegradable DOC was responsible for the higher removal of DOC after saturation with DOC in the ozone-BAC process.

scholarly journals Fixed-Bed Adsorption of Dyes on Bagasse Pith

1998 ◽  
Vol 16 (8) ◽  
pp. 623-639 ◽  
Author(s):  
G. McKay ◽  
T.F. Yee ◽  
M.M. Nassar ◽  
Y. Magdy
Keyword(s):  
Service Time ◽  
Sugar Cane ◽  
Fixed Bed ◽  
Breakthrough Curves ◽  
Time Model ◽  
Fixed Bed Adsorption ◽  
Basic Dyes ◽  
Bagasse Pith ◽  
Fixed Beds ◽  
Bed Depth Service Time

The adsorption of a number of basic dyes on to bagasse pith has been studied using fixed-bed adsorption. Pith is a waste material produced from the crushed cane (depithing operation) during the extraction of sugar from sugar cane. The results show that pith can adsorb basic dyes and breakthrough curves are reported at various heights in the fixed beds. The bed depth service time model has been used to assess the results.

Use of Wheeler–Jonas equation to explain xenon dynamic adsorption breakthrough curve on granular activated carbon

2010 ◽  
Vol 288 (1) ◽  
pp. 251-256 ◽  
Author(s):  
Chongyang Zhou ◽  
Yuren Jin ◽  
Hui Xu ◽  
Shujuan Feng ◽  
Guoqing Zhou ◽  
...  
Keyword(s):  
Activated Carbon ◽  
Breakthrough Curve ◽  
Granular Activated Carbon ◽  
Dynamic Adsorption

Photo-catalytic Study of Malachite Green Dye Degradation Using Rice Straw Extracted Activated Carbon Supported ZnO Nano-particles

2020 ◽  
Vol 10 (6) ◽  
pp. 849-859
Author(s):  
Radwa A. El-Salamony ◽  
Abeer A. Emam ◽  
Nagwa A. Badawy ◽  
Sara F. El-Morsi
Keyword(s):  
Activated Carbon ◽  
Visible Light ◽  
Rice Straw ◽  
Malachite Green ◽  
Dye Degradation ◽  
Nano Particles ◽  
Oh Radicals ◽  
Impregnation Method ◽  
Photo Degradation ◽  
Malachite Green Dye

Objective: ZnO nanoparticles were synthesized using wet impregnation method, and activated carbon from rice straw (RS) prepared through chemical route. Methods: The nano-composites ZnO-AC series were prepared with different ZnO:AC ratio of 10, 20, 50, and 70% to optimize the zinc oxide nanoparticles used. The obtained composites were characterized by FE-SEM, XRD, SBET, and optical techniques then used for the photo-degradation of Malachite green dye (MG) under visible light. Results: It was found that 10ZnO-AC exhibited excellent visible light photo-catalytic performance. The ·OH radicals’ formation is matching with photo-activity of the prepared composites. The photo-degradation efficiency of MG increased from 63% to 93%, when the 10ZnO-AC photocatalyst amount was increased from 0.5 to 6 g/L. Conclusion: The GC-MS technique was used to analyze the intermediates formed; up to 15 kinds of chemicals were identified as the degradation products.

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