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| Adsorption of Cadmium（Ⅱ） on Peanut Shell and Its Biochar |
| Received:May 09, 2014 |
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| KeyWord:peanut shells(PS);peanut shell derived biochar(PSB);cadmium(Ⅱ);Fourier Transform infrared spectroscopy(FTIR);isotherm models;biomass-based material |
| Author Name | Affiliation | E-mail | | CHENG Qi-ming | Key Laboratory of Urban Environment & Health, Institute of Urban Environment, Chinese Academy of Sciences, Xiamen 361021, China
Guangxi University, Nanning 530004, China | | | HUANG Qing | Key Laboratory of Urban Environment & Health, Institute of Urban Environment, Chinese Academy of Sciences, Xiamen 361021, China | qhuang@iue.ac.cn | | LIU Ying-jie | Key Laboratory of Urban Environment & Health, Institute of Urban Environment, Chinese Academy of Sciences, Xiamen 361021, China
College of Environmental Science and Engineering, Tongji University, Shanghai 200092, China | | | LIAO Zhen-ni | Key Laboratory of Urban Environment & Health, Institute of Urban Environment, Chinese Academy of Sciences, Xiamen 361021, China | |
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| Abstract: |
| Peanut shell is waste from agriculture and industry. This study was conducted to investigate the potential of peanut shell(PS) and its biochar(PSB) to remove cadmium(Cd2+) from aqueous solution under different conditions including pH, initial Cd2+ concentrations, adsorbent doses and time. The surface characteristics and mechanism of Cd adsorption were also investigated using scanning electron microscope, Fourier transform infrared spectroscopy(FTIR), BET specific surface area analyses and model simulation. Both PS and PSB were excellent adsorbents for Cd2+. At pH 5, 10 mg·L-1 of Cd2+ concentration and 4 mg· mL-1 of adsorbent, Cd2+ removal efficiencies were 93.33% and 99.51% for PS and PSB, respectively. The maximum adsorption for Cd2+ was respectively 26.88 mg·g -1 and 28.99 mg·g-1 for PS and PSB. Freundlich and Langmuir models could be used to describe the adsorption data, with the former better than the latter. The adsorption was mainly polymolecular layer adsorption and the complexation was one of the adsorption mechanisms. The main functional groups involved in the complexation were -CHO,-C=O,-OH and-P=O for PS;while-C=C-,-C≡C-,-C≡N and -OH for PSB. The SEM and FTIR analyses showed that a lot of particles or ash substances were deposited on the surface of PS and PSB after adsorption of Cd2+. |
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