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ZJUS-B
Journal of Zhejiang University-SCIENCE B (Biomedicine & Biotechnology)  2013, Vol. 14 Issue (7): 650-658    DOI: 10.1631/jzus.B12a0225
    
Adsorption of methylene blue onto activated carbon produced from tea (Camellia sinensis L.) seed shells: kinetics, equilibrium, and thermodynamics studies
Jun-jie Gao, Ye-bo Qin, Tao Zhou, Dong-dong Cao, Ping Xu, Danielle Hochstetter, Yue-fei Wang
Department of Tea Science, Zhejiang University, Hangzhou 310058, China; Crop Management Bureau, Agricultural Department of Zhejiang Province, Hangzhou 310029, China; Zhejiang Academy of Agricultural Sciences, Hangzhou 310021, China; Key Laboratory of Horticultural Plant Growth, Development and Quality Improvement, Ministry of Agriculture, Hangzhou 310029, China
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Abstract  Tea (Camellia sinensis L.) seed shells, the main byproduct of the manufacture of tea seed oil, were used as precursors for the preparation of tea activated carbon (TAC) in the present study. A high yield (44.1%) of TAC was obtained from tea seed shells via a one-step chemical method using ZnCl2 as an agent. The Brunauer-Emmett-Teller (BET) surface area and the total pore volumes of the obtained TAC were found to be 1530.67 mg2/g and 0.7826 cm3/g, respectively. The equilibrium adsorption results were complied with Langmuir isotherm model and its maximum monolayer adsorption capacity was 324.7 mg/g for methylene blue. Adsorption kinetics studies indicated that the pseudo-second-order model yielded the best fit for the kinetic data. An intraparticle diffusion model suggested that the intraparticle diffusion was not the only rate-controlling step. Thermodynamics studies revealed the spontaneous and exothermic nature of the sorption process. These results indicate that tea seed shells could be utilized as a renewable resource to develop activated carbon which is a potential adsorbent for methylene blue.

Key words： Activated carbon      Adsorption      Tea seed shells      Methylene blue     
Received: 10 September 2012      Published: 04 July 2013
CLC:  X712  
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Jun-jie Gao
Ye-bo Qin
Tao Zhou
Dong-dong Cao
Ping Xu
Danielle Hochstetter
Yue-fei Wang
Cite this article:

Jun-jie Gao, Ye-bo Qin, Tao Zhou, Dong-dong Cao, Ping Xu, Danielle Hochstetter, Yue-fei Wang. Adsorption of methylene blue onto activated carbon produced from tea (Camellia sinensis L.) seed shells: kinetics, equilibrium, and thermodynamics studies. Journal of Zhejiang University-SCIENCE B (Biomedicine & Biotechnology), 2013, 14(7): 650-658.

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http://www.zjujournals.com/xueshu/zjus-b/10.1631/jzus.B12a0225     OR     http://www.zjujournals.com/xueshu/zjus-b/Y2013/V14/I7/650

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