Optimization of cristal violet adsorption by calcium silicate waste material
In this study, calcium silicate waste material was used as adsorbent of crystal violet in batch mode. The calcium silicate was synthesised from fluosilicic acid (FSA), which is a by-product of phosphoric acid manufacture. The obtained calcium silicate was characterised by X-ray fluorescence spectros...
| Main Authors: | , , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
Elsevier
2022-11-01
|
| Series: | Scientific African |
| Subjects: | |
| Online Access: | http://www.sciencedirect.com/science/article/pii/S2468227622003234 |
| _version_ | 1828097482400202752 |
|---|---|
| author | Kalidou BA El Hadji Moussa DIOP Alpha Ousmane TOURE Falilou Mbacke SAMBE |
| author_facet | Kalidou BA El Hadji Moussa DIOP Alpha Ousmane TOURE Falilou Mbacke SAMBE |
| author_sort | Kalidou BA |
| collection | DOAJ |
| description | In this study, calcium silicate waste material was used as adsorbent of crystal violet in batch mode. The calcium silicate was synthesised from fluosilicic acid (FSA), which is a by-product of phosphoric acid manufacture. The obtained calcium silicate was characterised by X-ray fluorescence spectroscopy. The response surfaces, through the Box-Behnken model were used to model and optimize various adsorption parameters namely, the initial concentration of CV (A: 10–100 mg/L), the contact time (B: 5–50 min), the dose of adsorbent (C: 1–5 g/L) and the pH (D: 3–10). The removal efficiency of CV (97.86%), after statistical analysis, was obtained under the following optimal conditions: an adsorbent dose of 3.349 g/L, an initial CV concentration of 58 mg/L, a pH of 6.87 and a contact time of 30.49 min. The study of the four factors effects highlighted a positive effect on the removal of crystal violet. The interactions between adsorption time (B) and pH (D) and between adsorbent dose (C) and pH (D) were significantly important. However, an intermediate situation was noticed in the case of the interaction between adsorbent dose (C) and crystal violet concentration (A), where the lines cannot be considered parallel but do not cross each other in the analysed area either. The analysis of the residues showed that they are normally distributed and fluctuate in a random pattern. The adsorption kinetics were well described by the pseudo second order model and the equilibrium data were in agreement with the Langmuir isotherm model with a maximum adsorption capacity of 277.78 mg/g. |
| first_indexed | 2024-04-11T07:47:03Z |
| format | Article |
| id | doaj.art-4987e9a02cea488abcda79948181dd95 |
| institution | Directory Open Access Journal |
| issn | 2468-2276 |
| language | English |
| last_indexed | 2024-04-11T07:47:03Z |
| publishDate | 2022-11-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Scientific African |
| spelling | doaj.art-4987e9a02cea488abcda79948181dd952022-12-22T04:36:15ZengElsevierScientific African2468-22762022-11-0118e01417Optimization of cristal violet adsorption by calcium silicate waste materialKalidou BA0El Hadji Moussa DIOP1Alpha Ousmane TOURE2Falilou Mbacke SAMBE3Corresponding author.; Laboratory Water-Energy-Environment-Industrials Processes, Ecole Supérieure Polytechnique (ESP), Cheikh Anta DIOP University of Dakar, PO Box 5085 Dakar-Fann, SenegalLaboratory Water-Energy-Environment-Industrials Processes, Ecole Supérieure Polytechnique (ESP), Cheikh Anta DIOP University of Dakar, PO Box 5085 Dakar-Fann, SenegalLaboratory Water-Energy-Environment-Industrials Processes, Ecole Supérieure Polytechnique (ESP), Cheikh Anta DIOP University of Dakar, PO Box 5085 Dakar-Fann, SenegalLaboratory Water-Energy-Environment-Industrials Processes, Ecole Supérieure Polytechnique (ESP), Cheikh Anta DIOP University of Dakar, PO Box 5085 Dakar-Fann, SenegalIn this study, calcium silicate waste material was used as adsorbent of crystal violet in batch mode. The calcium silicate was synthesised from fluosilicic acid (FSA), which is a by-product of phosphoric acid manufacture. The obtained calcium silicate was characterised by X-ray fluorescence spectroscopy. The response surfaces, through the Box-Behnken model were used to model and optimize various adsorption parameters namely, the initial concentration of CV (A: 10–100 mg/L), the contact time (B: 5–50 min), the dose of adsorbent (C: 1–5 g/L) and the pH (D: 3–10). The removal efficiency of CV (97.86%), after statistical analysis, was obtained under the following optimal conditions: an adsorbent dose of 3.349 g/L, an initial CV concentration of 58 mg/L, a pH of 6.87 and a contact time of 30.49 min. The study of the four factors effects highlighted a positive effect on the removal of crystal violet. The interactions between adsorption time (B) and pH (D) and between adsorbent dose (C) and pH (D) were significantly important. However, an intermediate situation was noticed in the case of the interaction between adsorbent dose (C) and crystal violet concentration (A), where the lines cannot be considered parallel but do not cross each other in the analysed area either. The analysis of the residues showed that they are normally distributed and fluctuate in a random pattern. The adsorption kinetics were well described by the pseudo second order model and the equilibrium data were in agreement with the Langmuir isotherm model with a maximum adsorption capacity of 277.78 mg/g.http://www.sciencedirect.com/science/article/pii/S2468227622003234Surface responseBox-Behnken designAdsorption, Calcium silicateViolet crystal |
| spellingShingle | Kalidou BA El Hadji Moussa DIOP Alpha Ousmane TOURE Falilou Mbacke SAMBE Optimization of cristal violet adsorption by calcium silicate waste material Scientific African Surface response Box-Behnken design Adsorption, Calcium silicate Violet crystal |
| title | Optimization of cristal violet adsorption by calcium silicate waste material |
| title_full | Optimization of cristal violet adsorption by calcium silicate waste material |
| title_fullStr | Optimization of cristal violet adsorption by calcium silicate waste material |
| title_full_unstemmed | Optimization of cristal violet adsorption by calcium silicate waste material |
| title_short | Optimization of cristal violet adsorption by calcium silicate waste material |
| title_sort | optimization of cristal violet adsorption by calcium silicate waste material |
| topic | Surface response Box-Behnken design Adsorption, Calcium silicate Violet crystal |
| url | http://www.sciencedirect.com/science/article/pii/S2468227622003234 |
| work_keys_str_mv | AT kalidouba optimizationofcristalvioletadsorptionbycalciumsilicatewastematerial AT elhadjimoussadiop optimizationofcristalvioletadsorptionbycalciumsilicatewastematerial AT alphaousmanetoure optimizationofcristalvioletadsorptionbycalciumsilicatewastematerial AT faliloumbackesambe optimizationofcristalvioletadsorptionbycalciumsilicatewastematerial |