Experimental investigation of titanium dioxide as an adsorbent for removal of Congo red from aqueous solution, equilibrium and kinetics modeling
The adsorption of Congo red onto titanium dioxide (TiO2) material has been investigated at batch conditions. The effects of contact time (0–60 min), initial pH (3–11), agitation speed (100–500 rpm), temperature (298–343 K), adsorbent dosage (0.5–2 g/L), and Congo red concentration (5–15 mg/L) on the...
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| Format: | Article |
| Language: | English |
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IWA Publishing
2020-09-01
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| Series: | Journal of Water Reuse and Desalination |
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| Online Access: | http://jwrd.iwaponline.com/content/10/3/251 |
| _version_ | 1818262071997890560 |
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| author | Moussa Abbas |
| author_facet | Moussa Abbas |
| author_sort | Moussa Abbas |
| collection | DOAJ |
| description | The adsorption of Congo red onto titanium dioxide (TiO2) material has been investigated at batch conditions. The effects of contact time (0–60 min), initial pH (3–11), agitation speed (100–500 rpm), temperature (298–343 K), adsorbent dosage (0.5–2 g/L), and Congo red concentration (5–15 mg/L) on the Congo red adsorption by TiO2 have been studied. The kinetic parameters, rate constants, and equilibrium adsorption capacities were calculated and discussed for each kinetic model. The adsorption of Congo red onto TiO2 is well described by the pseudo-second order equation. The adsorption isotherm follows the Langmuir model, providing a better fit of the equilibrium data. The batch adsorption experiments were carried out to optimize the physical parameters on the Congo red removal efficiency. It has been found that 152 mg/g at 25 °C is removed. The thermodynamic parameters indicate the spontaneous and endothermic nature of the adsorption process with activation energy (Ea) of −64.193 kJ/mol. The positive value of the entropy (ΔS°) clearly shows that the randomness is decreased at the solid–solution interface during the Congo red adsorption onto TiO2, indicating that some structural exchange may occur among the active sites of the adsorbent and the ions. HIGHLIGHTS
The adsorption of Congo red onto titanium dioxide (TiO2) material has been investigated at batch conditions.;
The equilibrium experimental data were well fitted by the Langmuir isotherm model and it has been found that 152 mg/g at 25°C is removed.;
The adsorption of the dye follows the pseudo-second order kinetic model.;
A thermodynamic study showed the spontaneous and endothermic nature of the adsorption.; |
| first_indexed | 2024-12-12T18:57:18Z |
| format | Article |
| id | doaj.art-0991a2114ae04a39a241c53147d3c525 |
| institution | Directory Open Access Journal |
| issn | 2220-1319 2408-9370 |
| language | English |
| last_indexed | 2024-12-12T18:57:18Z |
| publishDate | 2020-09-01 |
| publisher | IWA Publishing |
| record_format | Article |
| series | Journal of Water Reuse and Desalination |
| spelling | doaj.art-0991a2114ae04a39a241c53147d3c5252022-12-22T00:15:12ZengIWA PublishingJournal of Water Reuse and Desalination2220-13192408-93702020-09-0110325126610.2166/wrd.2020.038038Experimental investigation of titanium dioxide as an adsorbent for removal of Congo red from aqueous solution, equilibrium and kinetics modelingMoussa Abbas0 Laboratory of Soft Technologies and Biodiversity, Faculty of Sciences, University M'hamed Bougara of Boumerdes, Boumerdes 35000, Algeria The adsorption of Congo red onto titanium dioxide (TiO2) material has been investigated at batch conditions. The effects of contact time (0–60 min), initial pH (3–11), agitation speed (100–500 rpm), temperature (298–343 K), adsorbent dosage (0.5–2 g/L), and Congo red concentration (5–15 mg/L) on the Congo red adsorption by TiO2 have been studied. The kinetic parameters, rate constants, and equilibrium adsorption capacities were calculated and discussed for each kinetic model. The adsorption of Congo red onto TiO2 is well described by the pseudo-second order equation. The adsorption isotherm follows the Langmuir model, providing a better fit of the equilibrium data. The batch adsorption experiments were carried out to optimize the physical parameters on the Congo red removal efficiency. It has been found that 152 mg/g at 25 °C is removed. The thermodynamic parameters indicate the spontaneous and endothermic nature of the adsorption process with activation energy (Ea) of −64.193 kJ/mol. The positive value of the entropy (ΔS°) clearly shows that the randomness is decreased at the solid–solution interface during the Congo red adsorption onto TiO2, indicating that some structural exchange may occur among the active sites of the adsorbent and the ions. HIGHLIGHTS The adsorption of Congo red onto titanium dioxide (TiO2) material has been investigated at batch conditions.; The equilibrium experimental data were well fitted by the Langmuir isotherm model and it has been found that 152 mg/g at 25°C is removed.; The adsorption of the dye follows the pseudo-second order kinetic model.; A thermodynamic study showed the spontaneous and endothermic nature of the adsorption.;http://jwrd.iwaponline.com/content/10/3/251adsorptioncongo redisothermmodelingthermodynamictitanium dioxide |
| spellingShingle | Moussa Abbas Experimental investigation of titanium dioxide as an adsorbent for removal of Congo red from aqueous solution, equilibrium and kinetics modeling Journal of Water Reuse and Desalination adsorption congo red isotherm modeling thermodynamic titanium dioxide |
| title | Experimental investigation of titanium dioxide as an adsorbent for removal of Congo red from aqueous solution, equilibrium and kinetics modeling |
| title_full | Experimental investigation of titanium dioxide as an adsorbent for removal of Congo red from aqueous solution, equilibrium and kinetics modeling |
| title_fullStr | Experimental investigation of titanium dioxide as an adsorbent for removal of Congo red from aqueous solution, equilibrium and kinetics modeling |
| title_full_unstemmed | Experimental investigation of titanium dioxide as an adsorbent for removal of Congo red from aqueous solution, equilibrium and kinetics modeling |
| title_short | Experimental investigation of titanium dioxide as an adsorbent for removal of Congo red from aqueous solution, equilibrium and kinetics modeling |
| title_sort | experimental investigation of titanium dioxide as an adsorbent for removal of congo red from aqueous solution equilibrium and kinetics modeling |
| topic | adsorption congo red isotherm modeling thermodynamic titanium dioxide |
| url | http://jwrd.iwaponline.com/content/10/3/251 |
| work_keys_str_mv | AT moussaabbas experimentalinvestigationoftitaniumdioxideasanadsorbentforremovalofcongoredfromaqueoussolutionequilibriumandkineticsmodeling |