Adsorption of Cd (II) Using Chemically Modified Rice Husk: Characterization, Equilibrium, and Kinetic Studies
Cadmium (Cd) is a highly toxic heavy metal considered carcinogenic to humans. The adsorption behavior of cadmium adsorption using untreated and chemically modified rice husk was investigated. Experimental tests were carried out to evaluate the influence of the variables pH, initial concentration of...
| Main Authors: | , , , , , , , |
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| Format: | Article |
| Language: | English |
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SAGE Publications
2022-01-01
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| Series: | Adsorption Science & Technology |
| Online Access: | http://dx.doi.org/10.1155/2022/3688155 |
| _version_ | 1797281057469366272 |
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| author | Javier Montalvo-Andía Warren Reátegui-Romero Alexis D. Peña-Contreras Walter F. Zaldivar Alvarez María E. King-Santos Víctor Fernández-Guzmán José Luis Guerrero-Guevara Jhon E. Puris-Naupay |
| author_facet | Javier Montalvo-Andía Warren Reátegui-Romero Alexis D. Peña-Contreras Walter F. Zaldivar Alvarez María E. King-Santos Víctor Fernández-Guzmán José Luis Guerrero-Guevara Jhon E. Puris-Naupay |
| author_sort | Javier Montalvo-Andía |
| collection | DOAJ |
| description | Cadmium (Cd) is a highly toxic heavy metal considered carcinogenic to humans. The adsorption behavior of cadmium adsorption using untreated and chemically modified rice husk was investigated. Experimental tests were carried out to evaluate the influence of the variables pH, initial concentration of cadmium, and dosage of adsorbent in the adsorption process. In optimal experimental conditions, the maximum adsorption efficiency was 92.65%. Fourier-transform infrared spectroscopy (FTIR) and scanning electron microscope (SEM) were used allowing the identification of the main functional groups and morphology of rice husk and treated rice husk, and the results showed an improvement of adsorption characteristics after rice husk treatment with NaOH. The optimum adsorption pH for both types of rice husk was 7. The maximum adsorption capacities of RH and treated RH fitted by the Langmuir model were 5.13 mg/g and 11.06 mg/g, respectively. The pseudosecond order kinetics has the best coefficients of determination for untreated (R2=0.992) and treated (R2=0.999) rice husk. The adsorption process was found to be endothermic in nature with enthalpy of 14.08 kJ/mol and entropy of 170.98 J/mol.K. The calculated activation energy was 24 kJ/mol. The results showed the potential of rice husk as a low-cost, easily managed, and efficient biosorbent for Cd removal from waters. |
| first_indexed | 2024-03-07T16:51:02Z |
| format | Article |
| id | doaj.art-5bcec3e206d942b189209e676a063e62 |
| institution | Directory Open Access Journal |
| issn | 2048-4038 |
| language | English |
| last_indexed | 2024-03-07T16:51:02Z |
| publishDate | 2022-01-01 |
| publisher | SAGE Publications |
| record_format | Article |
| series | Adsorption Science & Technology |
| spelling | doaj.art-5bcec3e206d942b189209e676a063e622024-03-03T05:25:27ZengSAGE PublicationsAdsorption Science & Technology2048-40382022-01-01202210.1155/2022/3688155Adsorption of Cd (II) Using Chemically Modified Rice Husk: Characterization, Equilibrium, and Kinetic StudiesJavier Montalvo-Andía0Warren Reátegui-Romero1Alexis D. Peña-Contreras2Walter F. Zaldivar Alvarez3María E. King-Santos4Víctor Fernández-Guzmán5José Luis Guerrero-Guevara6Jhon E. Puris-Naupay7Escuela de Ingeniería AmbientalFacultad de Ingeniería Química y Textil (FIQT)Facultad de Ingeniería Química y Textil (FIQT)Facultad de Ingeniería Química y Textil (FIQT)Facultad de Ingeniería Química y Textil (FIQT)Facultad de Ingeniería QuímicaFacultad de Ingeniería Química y Textil (FIQT)Facultad de Ingeniería Química y Textil (FIQT)Cadmium (Cd) is a highly toxic heavy metal considered carcinogenic to humans. The adsorption behavior of cadmium adsorption using untreated and chemically modified rice husk was investigated. Experimental tests were carried out to evaluate the influence of the variables pH, initial concentration of cadmium, and dosage of adsorbent in the adsorption process. In optimal experimental conditions, the maximum adsorption efficiency was 92.65%. Fourier-transform infrared spectroscopy (FTIR) and scanning electron microscope (SEM) were used allowing the identification of the main functional groups and morphology of rice husk and treated rice husk, and the results showed an improvement of adsorption characteristics after rice husk treatment with NaOH. The optimum adsorption pH for both types of rice husk was 7. The maximum adsorption capacities of RH and treated RH fitted by the Langmuir model were 5.13 mg/g and 11.06 mg/g, respectively. The pseudosecond order kinetics has the best coefficients of determination for untreated (R2=0.992) and treated (R2=0.999) rice husk. The adsorption process was found to be endothermic in nature with enthalpy of 14.08 kJ/mol and entropy of 170.98 J/mol.K. The calculated activation energy was 24 kJ/mol. The results showed the potential of rice husk as a low-cost, easily managed, and efficient biosorbent for Cd removal from waters.http://dx.doi.org/10.1155/2022/3688155 |
| spellingShingle | Javier Montalvo-Andía Warren Reátegui-Romero Alexis D. Peña-Contreras Walter F. Zaldivar Alvarez María E. King-Santos Víctor Fernández-Guzmán José Luis Guerrero-Guevara Jhon E. Puris-Naupay Adsorption of Cd (II) Using Chemically Modified Rice Husk: Characterization, Equilibrium, and Kinetic Studies Adsorption Science & Technology |
| title | Adsorption of Cd (II) Using Chemically Modified Rice Husk: Characterization, Equilibrium, and Kinetic Studies |
| title_full | Adsorption of Cd (II) Using Chemically Modified Rice Husk: Characterization, Equilibrium, and Kinetic Studies |
| title_fullStr | Adsorption of Cd (II) Using Chemically Modified Rice Husk: Characterization, Equilibrium, and Kinetic Studies |
| title_full_unstemmed | Adsorption of Cd (II) Using Chemically Modified Rice Husk: Characterization, Equilibrium, and Kinetic Studies |
| title_short | Adsorption of Cd (II) Using Chemically Modified Rice Husk: Characterization, Equilibrium, and Kinetic Studies |
| title_sort | adsorption of cd ii using chemically modified rice husk characterization equilibrium and kinetic studies |
| url | http://dx.doi.org/10.1155/2022/3688155 |
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