Equilibrium, Kinetic, and Thermodynamic Studies on the Adsorption of Cadmium from Aqueous Solution by Modified Biomass Ash
Natural biomass ash of agricultural residuals was collected from a power plant and modified with hexagonal mesoporous silica and functionalized with 3-aminopropyltriethoxysilane. The physicochemical and morphological properties of the biomass ash were analyzed by ICP-OES, SEM, TEM-EDS, FTIR, and BET...
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| Main Authors: | , , , , , |
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| Format: | Article |
| Language: | English |
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Wiley
2017-01-01
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| Series: | Bioinorganic Chemistry and Applications |
| Online Access: | http://dx.doi.org/10.1155/2017/3695604 |
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| _version_ | 1832566521970294784 |
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| author | Lei Xu Xuebo Zheng Hongbiao Cui Zhenqiu Zhu Jiani Liang Jing Zhou |
| author_facet | Lei Xu Xuebo Zheng Hongbiao Cui Zhenqiu Zhu Jiani Liang Jing Zhou |
| author_sort | Lei Xu |
| collection | DOAJ |
| description | Natural biomass ash of agricultural residuals was collected from a power plant and modified with hexagonal mesoporous silica and functionalized with 3-aminopropyltriethoxysilane. The physicochemical and morphological properties of the biomass ash were analyzed by ICP-OES, SEM, TEM-EDS, FTIR, and BET analysis. The adsorption behavior of the modified product for Cd2+ in aqueous solution was studied as a function of pH, initial metal concentration, equilibrium time, and temperature. Results showed that the specific surface area of the modified product was 9 times that of the natural biomass ash. The modified biomass ash exhibited high affinity for Cd2+ and its adsorption capacity increased sharply with increasing pH from 4.0 to 6.0. The maximum adsorption capacity was 23.95 mg/g in a pH 5 solution with an initial metal concentration of 50 mg/L and a contact time of 90 min. The adsorption of Cd2+ onto the modified biomass ash was well fitted to the Langmuir model and it followed pseudo-second-order kinetics. Thermodynamic analysis results showed that the adsorption of Cd2+ was spontaneous and endothermic in nature. The results suggest that the modified biomass ash is promising for use as an inexpensive and effective adsorbent for Cd2+ removal from aqueous solution. |
| format | Article |
| id | doaj-art-0686857f1e554fd4a8f2ca5bc86523a3 |
| institution | Kabale University |
| issn | 1565-3633 1687-479X |
| language | English |
| publishDate | 2017-01-01 |
| publisher | Wiley |
| record_format | Article |
| series | Bioinorganic Chemistry and Applications |
| spelling | doaj-art-0686857f1e554fd4a8f2ca5bc86523a32025-02-03T01:03:49ZengWileyBioinorganic Chemistry and Applications1565-36331687-479X2017-01-01201710.1155/2017/36956043695604Equilibrium, Kinetic, and Thermodynamic Studies on the Adsorption of Cadmium from Aqueous Solution by Modified Biomass AshLei Xu0Xuebo Zheng1Hongbiao Cui2Zhenqiu Zhu3Jiani Liang4Jing Zhou5Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008, ChinaInstitute of Soil Science, Chinese Academy of Sciences, Nanjing 210008, ChinaSchool of Earth and Environment, Anhui University of Science and Technology, Huainan 232001, ChinaInstitute of Soil Science, Chinese Academy of Sciences, Nanjing 210008, ChinaInstitute of Soil Science, Chinese Academy of Sciences, Nanjing 210008, ChinaInstitute of Soil Science, Chinese Academy of Sciences, Nanjing 210008, ChinaNatural biomass ash of agricultural residuals was collected from a power plant and modified with hexagonal mesoporous silica and functionalized with 3-aminopropyltriethoxysilane. The physicochemical and morphological properties of the biomass ash were analyzed by ICP-OES, SEM, TEM-EDS, FTIR, and BET analysis. The adsorption behavior of the modified product for Cd2+ in aqueous solution was studied as a function of pH, initial metal concentration, equilibrium time, and temperature. Results showed that the specific surface area of the modified product was 9 times that of the natural biomass ash. The modified biomass ash exhibited high affinity for Cd2+ and its adsorption capacity increased sharply with increasing pH from 4.0 to 6.0. The maximum adsorption capacity was 23.95 mg/g in a pH 5 solution with an initial metal concentration of 50 mg/L and a contact time of 90 min. The adsorption of Cd2+ onto the modified biomass ash was well fitted to the Langmuir model and it followed pseudo-second-order kinetics. Thermodynamic analysis results showed that the adsorption of Cd2+ was spontaneous and endothermic in nature. The results suggest that the modified biomass ash is promising for use as an inexpensive and effective adsorbent for Cd2+ removal from aqueous solution.http://dx.doi.org/10.1155/2017/3695604 |
| spellingShingle | Lei Xu Xuebo Zheng Hongbiao Cui Zhenqiu Zhu Jiani Liang Jing Zhou Equilibrium, Kinetic, and Thermodynamic Studies on the Adsorption of Cadmium from Aqueous Solution by Modified Biomass Ash Bioinorganic Chemistry and Applications |
| title | Equilibrium, Kinetic, and Thermodynamic Studies on the Adsorption of Cadmium from Aqueous Solution by Modified Biomass Ash |
| title_full | Equilibrium, Kinetic, and Thermodynamic Studies on the Adsorption of Cadmium from Aqueous Solution by Modified Biomass Ash |
| title_fullStr | Equilibrium, Kinetic, and Thermodynamic Studies on the Adsorption of Cadmium from Aqueous Solution by Modified Biomass Ash |
| title_full_unstemmed | Equilibrium, Kinetic, and Thermodynamic Studies on the Adsorption of Cadmium from Aqueous Solution by Modified Biomass Ash |
| title_short | Equilibrium, Kinetic, and Thermodynamic Studies on the Adsorption of Cadmium from Aqueous Solution by Modified Biomass Ash |
| title_sort | equilibrium kinetic and thermodynamic studies on the adsorption of cadmium from aqueous solution by modified biomass ash |
| url | http://dx.doi.org/10.1155/2017/3695604 |
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