Cationic and Anionic Dye Adsorption on a Natural Clayey Composite
One of the main challenges for environmental sciences today is the effective treatment of dye-laden industrial effluents. This work aimed to study the potential of an untreated (natural occurring clayey composite) red clay (RC) for the adsorption of a cationic dye Basic Navy Blue 2RN (CNB) and anion...
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MDPI AG
2021-05-01
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| Series: | Applied Sciences |
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| Online Access: | https://www.mdpi.com/2076-3417/11/11/5127 |
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| author | Carmen Omaira Márquez Víctor Julio García Jefferson Raúl Guaypatin Francisco Fernández-Martínez Anita Cecilia Ríos |
| author_facet | Carmen Omaira Márquez Víctor Julio García Jefferson Raúl Guaypatin Francisco Fernández-Martínez Anita Cecilia Ríos |
| author_sort | Carmen Omaira Márquez |
| collection | DOAJ |
| description | One of the main challenges for environmental sciences today is the effective treatment of dye-laden industrial effluents. This work aimed to study the potential of an untreated (natural occurring clayey composite) red clay (RC) for the adsorption of a cationic dye Basic Navy Blue 2RN (CNB) and anionic dye Drimaren Yellow CL-2R (ADY). We evaluated the effect of pH, dye concentration, and adsorbent concentration on the removal effectiveness to study the absorption process. Also, we studied the adsorption process by analyzing the feasibility of several known adsorption isotherms and kinetic models. The results show that at a pH of less than 4, the CNB and ADY removal percentages were 97% and 96%, respectively. At a pH greater than 8, the CNB and ADY removals were 75% and 25%, respectively. The CNB adsorption happened by chemisorption of a monolayer on iron-containing particles (IPs). In congtrast, the ADY adsorption occurred by monolayer physisorption on kaolinite particles (KPs) and Na, K-rich Laumontite particles (LPs). The Langmuir isotherm model fits very well with CNB experimental data. The Temkin model shows the best fit between the isotherm function and the ADY dye-adsorption data. The pseudo-second-order kinetic model fits the CNB and ADY dye-adsorption data on RC particles. The heterogeneous composition of naturally occurring clay favors different adsorption mechanisms and opens an avenue for the separation process’s engineering. |
| first_indexed | 2024-03-10T10:49:50Z |
| format | Article |
| id | doaj.art-78182ec5ee62496491a4d0ba5b1aa363 |
| institution | Directory Open Access Journal |
| issn | 2076-3417 |
| language | English |
| last_indexed | 2024-03-10T10:49:50Z |
| publishDate | 2021-05-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Applied Sciences |
| spelling | doaj.art-78182ec5ee62496491a4d0ba5b1aa3632023-11-21T22:19:21ZengMDPI AGApplied Sciences2076-34172021-05-011111512710.3390/app11115127Cationic and Anionic Dye Adsorption on a Natural Clayey CompositeCarmen Omaira Márquez0Víctor Julio García1Jefferson Raúl Guaypatin2Francisco Fernández-Martínez3Anita Cecilia Ríos4Facultad de Ingeniería, Carrera de Ingeniera Ambiental, Universidad Nacional de Chimborazo, 060150 Riobamba, EcuadorFacultad de Ingeniería, Carrera de Ingeniería Civil, Universidad Nacional de Chimborazo, 060150 Riobamba, EcuadorMinisterio del Ambiente y Agua de la Republica de Ecuador, 18010 Ambato, EcuadorDepartamento de Química de Industrial y Polímeros, Universidad Politécnica de Madrid, 28012 Madrid, SpainFacultad de Ingeniería, Carrera de Ingeniera Ambiental, Universidad Nacional de Chimborazo, 060150 Riobamba, EcuadorOne of the main challenges for environmental sciences today is the effective treatment of dye-laden industrial effluents. This work aimed to study the potential of an untreated (natural occurring clayey composite) red clay (RC) for the adsorption of a cationic dye Basic Navy Blue 2RN (CNB) and anionic dye Drimaren Yellow CL-2R (ADY). We evaluated the effect of pH, dye concentration, and adsorbent concentration on the removal effectiveness to study the absorption process. Also, we studied the adsorption process by analyzing the feasibility of several known adsorption isotherms and kinetic models. The results show that at a pH of less than 4, the CNB and ADY removal percentages were 97% and 96%, respectively. At a pH greater than 8, the CNB and ADY removals were 75% and 25%, respectively. The CNB adsorption happened by chemisorption of a monolayer on iron-containing particles (IPs). In congtrast, the ADY adsorption occurred by monolayer physisorption on kaolinite particles (KPs) and Na, K-rich Laumontite particles (LPs). The Langmuir isotherm model fits very well with CNB experimental data. The Temkin model shows the best fit between the isotherm function and the ADY dye-adsorption data. The pseudo-second-order kinetic model fits the CNB and ADY dye-adsorption data on RC particles. The heterogeneous composition of naturally occurring clay favors different adsorption mechanisms and opens an avenue for the separation process’s engineering.https://www.mdpi.com/2076-3417/11/11/5127clayey compositeadsorption isothermadsorption kineticanionic dye adsorptiondye adsorptionbasic navy blue 2RN |
| spellingShingle | Carmen Omaira Márquez Víctor Julio García Jefferson Raúl Guaypatin Francisco Fernández-Martínez Anita Cecilia Ríos Cationic and Anionic Dye Adsorption on a Natural Clayey Composite Applied Sciences clayey composite adsorption isotherm adsorption kinetic anionic dye adsorption dye adsorption basic navy blue 2RN |
| title | Cationic and Anionic Dye Adsorption on a Natural Clayey Composite |
| title_full | Cationic and Anionic Dye Adsorption on a Natural Clayey Composite |
| title_fullStr | Cationic and Anionic Dye Adsorption on a Natural Clayey Composite |
| title_full_unstemmed | Cationic and Anionic Dye Adsorption on a Natural Clayey Composite |
| title_short | Cationic and Anionic Dye Adsorption on a Natural Clayey Composite |
| title_sort | cationic and anionic dye adsorption on a natural clayey composite |
| topic | clayey composite adsorption isotherm adsorption kinetic anionic dye adsorption dye adsorption basic navy blue 2RN |
| url | https://www.mdpi.com/2076-3417/11/11/5127 |
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