Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
10223349 | Ecological Engineering | 2018 | 7 Pages |
Abstract
To reveal the performance of stem powder of Solidago canadensis as a putatively advantageous biosorbent for removal of Cd(II) from simulated waste water, the kinetic and thermodynamic characteristics of biosorption, the effects of ionic strength, humic acid and the physio-chemical factors on biosorption, as well as the desorption and regeneration processes were investigated comprehensively. The stem of S. canadensis was oven-dried and processed into fine powder then mixed with 5â¯mg/L, 10â¯mg/L or 20â¯mg/L Cd(II) solution. The residual concentration was measured using flame atomic absorption spectrometry. The reacting conditions were optimized to pHâ¯=â¯6.0 with a dosage of 0.5â¯g/L for contact of 240â¯min. The results showed that: the biosorption reaction is best described by Langmuir monolayer isotherm and pseudo-second-order kinetic models; thermodynamic analysis indicates an exothermic and entropy-decreasing biosorption process; at the optimal temperature 298â¯K, the saturated biosorption capacity was 19.34â¯mg/g, greater than that of rise husk and wheat straw reported literally; the increase of ionic strength was beneficial to the capacity of biosorption, for example 0.01â¯mmol/L and, 0.1â¯mmol/L Na+ increased the biosorption capacity from 17.58â¯mg/g to 19.03â¯mg/g and 19.50â¯mg/g; the presence of 20â¯mg/L Ca (II) Mg(II) or humic acid reduced the biosorption capacity by 62.2%, 44.0% and 51.9%, respectively; growing additional amounts of alkaline earth metal ions or humic acid increasingly reduce the biosorption capacity; using 0.01â¯mmol/L HCl as an agent to regenerate the Cd(II)-loaded biosorbent, the biosorption efficiency decreased to 69.11% of the first round biosorption after 4 cycles. Our results demonstrate that the stem powder of S. canadensis is a promising biomass-based biosorbent for the removal of Cd(II) from waste water for its fine capacity of biosorption and regeneration.
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Authors
Jia-wei Zhang, Feng-zhi Bi, Qiao-jia Wang, Wen-lin Wang, Bo Liu, Stanley Lutts, Wei Wei, Yan-ping Zhao, Guo-xiang Wang, Rui-ming Han,