Adsorption of Dye by Waste Black Tea Powder: Parameters, Kinetic, Equilibrium, and Thermodynamic Studies
Waste black tea powder was used as a potential adsorbent to remove methylene blue (MB) from aqueous solution. Several operating factors in adsorption of MB onto waste black tea powder were investigated, including contact time, initial MB concentration, solution pH, adsorption temperature, and dosage...
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| Format: | Article |
| Language: | English |
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Wiley
2020-01-01
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| Series: | Journal of Chemistry |
| Online Access: | http://dx.doi.org/10.1155/2020/5431046 |
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| author | Dongyi Lin Fan Wu Yuqun Hu Tingzhong Zhang Chengshun Liu Qiangda Hu Yunfei Hu Zhihui Xue Hua Han Tzu-Hsing Ko |
| author_facet | Dongyi Lin Fan Wu Yuqun Hu Tingzhong Zhang Chengshun Liu Qiangda Hu Yunfei Hu Zhihui Xue Hua Han Tzu-Hsing Ko |
| author_sort | Dongyi Lin |
| collection | DOAJ |
| description | Waste black tea powder was used as a potential adsorbent to remove methylene blue (MB) from aqueous solution. Several operating factors in adsorption of MB onto waste black tea powder were investigated, including contact time, initial MB concentration, solution pH, adsorption temperature, and dosage of waste black tea powder. Experimental results revealed that the adsorption efficiency increased with contact time and solution pH values and decreased with initial MB concentration and adsorption temperature. The equilibrium time was estimated to be around 60 min. The maximum adsorption capacity and the highest adsorption efficiency were 302.63 mg·g−1 and 100%, respectively. In kinetic study, pseudo-first-order and pseudo-second-order kinetic models, intraparticle diffusion model, and Boyd and Elovich models were employed to analyze the adsorption behavior and the adsorption mechanism. It was found that the pseudo-second-order kinetic model was suitable to describe the adsorption process, and the calculated equilibrium adsorption capacity was well close to the experimental data for different initial MB concentrations. The internal diffusion was not the only rate-controlling step, and the existence of boundary effect was observed in this study. From isotherm analysis, the equilibrium data were well represented by the Langmuir model, rather than Freundlich, Dubinin–Redushckevich, or Temkin models. The nonlinear fitting for various isotherm models implied that the adsorption behavior between MB and waste black tea powder was complication. Thermodynamic parameters including changes in Gibb’s free energy, enthalpy, and entropy suggested that adsorption of MB onto waste black tea powder was a spontaneous and exothermic process. The multiple regeneration/adsorption experiments indicated that the used black tea powder efficiently remained more than 75% after five cycles using NaOH as a regenerative reagent and thus be used for many times. Therefore, as a low-cost and easily available material, waste black tea powder could be applied in wastewater treatment. |
| format | Article |
| id | doaj-art-c8b0a65e9ab24495829e8b8ccb6c9504 |
| institution | OA Journals |
| issn | 2090-9063 2090-9071 |
| language | English |
| publishDate | 2020-01-01 |
| publisher | Wiley |
| record_format | Article |
| series | Journal of Chemistry |
| spelling | doaj-art-c8b0a65e9ab24495829e8b8ccb6c95042025-08-20T02:19:41ZengWileyJournal of Chemistry2090-90632090-90712020-01-01202010.1155/2020/54310465431046Adsorption of Dye by Waste Black Tea Powder: Parameters, Kinetic, Equilibrium, and Thermodynamic StudiesDongyi Lin0Fan Wu1Yuqun Hu2Tingzhong Zhang3Chengshun Liu4Qiangda Hu5Yunfei Hu6Zhihui Xue7Hua Han8Tzu-Hsing Ko9Anxi College of Tea Science, Fujian Agriculture and Forestry University, Fuzhou City, Fujian Province, ChinaAnxi College of Tea Science, Fujian Agriculture and Forestry University, Fuzhou City, Fujian Province, ChinaAnxi College of Tea Science, Fujian Agriculture and Forestry University, Fuzhou City, Fujian Province, ChinaAnxi College of Tea Science, Fujian Agriculture and Forestry University, Fuzhou City, Fujian Province, ChinaAnxi College of Tea Science, Fujian Agriculture and Forestry University, Fuzhou City, Fujian Province, ChinaAnxi College of Tea Science, Fujian Agriculture and Forestry University, Fuzhou City, Fujian Province, ChinaAnxi College of Tea Science, Fujian Agriculture and Forestry University, Fuzhou City, Fujian Province, ChinaAnxi College of Tea Science, Fujian Agriculture and Forestry University, Fuzhou City, Fujian Province, ChinaAnxi College of Tea Science, Fujian Agriculture and Forestry University, Fuzhou City, Fujian Province, ChinaAnxi College of Tea Science, Fujian Agriculture and Forestry University, Fuzhou City, Fujian Province, ChinaWaste black tea powder was used as a potential adsorbent to remove methylene blue (MB) from aqueous solution. Several operating factors in adsorption of MB onto waste black tea powder were investigated, including contact time, initial MB concentration, solution pH, adsorption temperature, and dosage of waste black tea powder. Experimental results revealed that the adsorption efficiency increased with contact time and solution pH values and decreased with initial MB concentration and adsorption temperature. The equilibrium time was estimated to be around 60 min. The maximum adsorption capacity and the highest adsorption efficiency were 302.63 mg·g−1 and 100%, respectively. In kinetic study, pseudo-first-order and pseudo-second-order kinetic models, intraparticle diffusion model, and Boyd and Elovich models were employed to analyze the adsorption behavior and the adsorption mechanism. It was found that the pseudo-second-order kinetic model was suitable to describe the adsorption process, and the calculated equilibrium adsorption capacity was well close to the experimental data for different initial MB concentrations. The internal diffusion was not the only rate-controlling step, and the existence of boundary effect was observed in this study. From isotherm analysis, the equilibrium data were well represented by the Langmuir model, rather than Freundlich, Dubinin–Redushckevich, or Temkin models. The nonlinear fitting for various isotherm models implied that the adsorption behavior between MB and waste black tea powder was complication. Thermodynamic parameters including changes in Gibb’s free energy, enthalpy, and entropy suggested that adsorption of MB onto waste black tea powder was a spontaneous and exothermic process. The multiple regeneration/adsorption experiments indicated that the used black tea powder efficiently remained more than 75% after five cycles using NaOH as a regenerative reagent and thus be used for many times. Therefore, as a low-cost and easily available material, waste black tea powder could be applied in wastewater treatment.http://dx.doi.org/10.1155/2020/5431046 |
| spellingShingle | Dongyi Lin Fan Wu Yuqun Hu Tingzhong Zhang Chengshun Liu Qiangda Hu Yunfei Hu Zhihui Xue Hua Han Tzu-Hsing Ko Adsorption of Dye by Waste Black Tea Powder: Parameters, Kinetic, Equilibrium, and Thermodynamic Studies Journal of Chemistry |
| title | Adsorption of Dye by Waste Black Tea Powder: Parameters, Kinetic, Equilibrium, and Thermodynamic Studies |
| title_full | Adsorption of Dye by Waste Black Tea Powder: Parameters, Kinetic, Equilibrium, and Thermodynamic Studies |
| title_fullStr | Adsorption of Dye by Waste Black Tea Powder: Parameters, Kinetic, Equilibrium, and Thermodynamic Studies |
| title_full_unstemmed | Adsorption of Dye by Waste Black Tea Powder: Parameters, Kinetic, Equilibrium, and Thermodynamic Studies |
| title_short | Adsorption of Dye by Waste Black Tea Powder: Parameters, Kinetic, Equilibrium, and Thermodynamic Studies |
| title_sort | adsorption of dye by waste black tea powder parameters kinetic equilibrium and thermodynamic studies |
| url | http://dx.doi.org/10.1155/2020/5431046 |
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