Adsorption of Nitrate onto ZnCl2-Modified Coconut Granular Activated Carbon: Kinetics, Characteristics, and Adsorption Dynamics
Coconut granular activated carbon (CGAC) was modified by impregnating with ZnCl2 solution to remove nitrate from aqueous solutions. Sorption isotherm and kinetic studies were carried out in a series of batch experiments. Nitrate adsorption of both ZnCl2-modified CGAC and CGAC fitted the Langmuir and...
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| Format: | Article |
| Language: | English |
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Wiley
2018-01-01
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| Series: | Advances in Materials Science and Engineering |
| Online Access: | http://dx.doi.org/10.1155/2018/1939032 |
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| author | Lingjie Liu Min Ji Fen Wang |
| author_facet | Lingjie Liu Min Ji Fen Wang |
| author_sort | Lingjie Liu |
| collection | DOAJ |
| description | Coconut granular activated carbon (CGAC) was modified by impregnating with ZnCl2 solution to remove nitrate from aqueous solutions. Sorption isotherm and kinetic studies were carried out in a series of batch experiments. Nitrate adsorption of both ZnCl2-modified CGAC and CGAC fitted the Langmuir and Freundlich models. Batch adsorption isotherms indicated that the maximum adsorption capacities of ZnCl2-modified CGAC and CGAC were calculated as 14.01 mgN·g−1 and 0.28 mgN·g−1, respectively. The kinetic data obtained from batch experiments were well described by pseudo-second-order model. The column study was used to analyze the dynamic adsorption process. The highest bed adsorption capacity of 1.76 mgN·g−1 was obtained by 50 mgN·L−1 inlet nitrate concentration, 20 g adsorbents, and 10 ml·min−1 flow rate. The dynamic adsorption data were fitted well to the Thomas and Yoon–Nelson models with coefficients of correlation R2 > 0.834 at different conditions. Surface characteristics and pore structures of CGAC and ZnCl2-modified CGAC were performed by SEM and EDAX and BET and indicated that ZnCl2 had adhered to the surface of GAC after modified. Zeta potential, Raman spectra, and FTIR suggested the electrostatic attraction between the nitrate ions and positive charge. The results revealed that the mechanism of adsorption nitrate mainly depended on electrostatic attraction almost without any chemical interactions. |
| format | Article |
| id | doaj-art-23dd6945946d4ec5bf3d67a99728e773 |
| institution | Kabale University |
| issn | 1687-8434 1687-8442 |
| language | English |
| publishDate | 2018-01-01 |
| publisher | Wiley |
| record_format | Article |
| series | Advances in Materials Science and Engineering |
| spelling | doaj-art-23dd6945946d4ec5bf3d67a99728e7732025-08-20T03:54:57ZengWileyAdvances in Materials Science and Engineering1687-84341687-84422018-01-01201810.1155/2018/19390321939032Adsorption of Nitrate onto ZnCl2-Modified Coconut Granular Activated Carbon: Kinetics, Characteristics, and Adsorption DynamicsLingjie Liu0Min Ji1Fen Wang2School of Environmental Science and Engineering, Tianjin University, Tianjin 300350, ChinaSchool of Environmental Science and Engineering, Tianjin University, Tianjin 300350, ChinaSchool of Environmental Science and Engineering, Tianjin University, Tianjin 300350, ChinaCoconut granular activated carbon (CGAC) was modified by impregnating with ZnCl2 solution to remove nitrate from aqueous solutions. Sorption isotherm and kinetic studies were carried out in a series of batch experiments. Nitrate adsorption of both ZnCl2-modified CGAC and CGAC fitted the Langmuir and Freundlich models. Batch adsorption isotherms indicated that the maximum adsorption capacities of ZnCl2-modified CGAC and CGAC were calculated as 14.01 mgN·g−1 and 0.28 mgN·g−1, respectively. The kinetic data obtained from batch experiments were well described by pseudo-second-order model. The column study was used to analyze the dynamic adsorption process. The highest bed adsorption capacity of 1.76 mgN·g−1 was obtained by 50 mgN·L−1 inlet nitrate concentration, 20 g adsorbents, and 10 ml·min−1 flow rate. The dynamic adsorption data were fitted well to the Thomas and Yoon–Nelson models with coefficients of correlation R2 > 0.834 at different conditions. Surface characteristics and pore structures of CGAC and ZnCl2-modified CGAC were performed by SEM and EDAX and BET and indicated that ZnCl2 had adhered to the surface of GAC after modified. Zeta potential, Raman spectra, and FTIR suggested the electrostatic attraction between the nitrate ions and positive charge. The results revealed that the mechanism of adsorption nitrate mainly depended on electrostatic attraction almost without any chemical interactions.http://dx.doi.org/10.1155/2018/1939032 |
| spellingShingle | Lingjie Liu Min Ji Fen Wang Adsorption of Nitrate onto ZnCl2-Modified Coconut Granular Activated Carbon: Kinetics, Characteristics, and Adsorption Dynamics Advances in Materials Science and Engineering |
| title | Adsorption of Nitrate onto ZnCl2-Modified Coconut Granular Activated Carbon: Kinetics, Characteristics, and Adsorption Dynamics |
| title_full | Adsorption of Nitrate onto ZnCl2-Modified Coconut Granular Activated Carbon: Kinetics, Characteristics, and Adsorption Dynamics |
| title_fullStr | Adsorption of Nitrate onto ZnCl2-Modified Coconut Granular Activated Carbon: Kinetics, Characteristics, and Adsorption Dynamics |
| title_full_unstemmed | Adsorption of Nitrate onto ZnCl2-Modified Coconut Granular Activated Carbon: Kinetics, Characteristics, and Adsorption Dynamics |
| title_short | Adsorption of Nitrate onto ZnCl2-Modified Coconut Granular Activated Carbon: Kinetics, Characteristics, and Adsorption Dynamics |
| title_sort | adsorption of nitrate onto zncl2 modified coconut granular activated carbon kinetics characteristics and adsorption dynamics |
| url | http://dx.doi.org/10.1155/2018/1939032 |
| work_keys_str_mv | AT lingjieliu adsorptionofnitrateontozncl2modifiedcoconutgranularactivatedcarbonkineticscharacteristicsandadsorptiondynamics AT minji adsorptionofnitrateontozncl2modifiedcoconutgranularactivatedcarbonkineticscharacteristicsandadsorptiondynamics AT fenwang adsorptionofnitrateontozncl2modifiedcoconutgranularactivatedcarbonkineticscharacteristicsandadsorptiondynamics |