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Adsorption characteristics of heavy metal ions from aqueous solution by fermented stalk |
DONG Jing1,2,3, SUN Changhong1,2, WANG Yonggang1,2, WANG Jianlong3 |
1. Beijing Municipal Research Institute of Environmental Protection, Beijing 100037, China;
2. National Engineering Research Center for Urban Environmental Pollution Control, Beijing 100037, China;
3. Institute of Nuclear and New Energy Technology, Tsinghua University, Beijing 100084, China |
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Abstract: The biosorption is a new technology, which can be widely applied for the removal of heavy metals from wastewater. The development of an efficient and low-cost adsorbent is a key in the biosorption technology. The adsorption performance of Pb(Ⅱ) by the fermented sweet sorghum stalks (FSSR) is discussed in this paper. The adsorption process is a chemical one and follows the pseudo-second order kinetics. After fermented, the equilibrium adsorption capacity of the material is increased from 3.32 mg/g to 6.92 mg/g. The isotherm adsorption is fitted well with the linear Langmuir model. When the temperature rises from 10℃ to 40℃, the maximum adsorption capacity of Pb (Ⅱ) is increased from 5.92 mg/g to 7.23 mg/g. In binary and ternary systems, the adsorption capacities are in the order of Pb(Ⅱ) > Cu (Ⅱ) > Zn(Ⅱ). There are more active functional groups on the surface of the stalk after fermentation, and these changes will be beneficial to the adsorption reaction and can improve the adsorption capacity.
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Received: 15 November 2016
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