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| Effects of dissolved organic matter on the adsorption characteristics of Cu(Ⅱ)by periphyton |
| Received:October 15, 2019 |
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| KeyWord:periphyton;dissolved organic matter;copper;adsorption |
| Author Name | Affiliation | E-mail | | SUN Chen-min | College of Resources and Environment, Hunan Agricultural University, Changsha 410128, China | | | SHAO Ji-hai | College of Resources and Environment, Hunan Agricultural University, Changsha 410128, China | shao@hunau.net | | KUANG Xiao-lin | College of Resources and Environment, Hunan Agricultural University, Changsha 410128, China | |
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| Abstract: |
| Cu(Ⅱ)ions and dissolved organic matter(DOM)originating from livestock manure co-exist in livestock wastewater. To elucidate the effects of DOM originating from cow manure on the adsorption characteristics of Cu(Ⅱ)by periphyton, the adsorption capacity, adsorption kinetics, and adsorption isotherm of Cu(Ⅱ)by periphyton were investigated in this study. The possible mechanisms were proposed based on the data of adsorption, desorption, and Fourier infrared spectra. The results showed that cow DOM enriched hydroxyl, carboxyl, and phosphoryl, which could decrease the adsorption capacity of Cu(Ⅱ)by periphyton through competitive adsorption. The adsorption isotherm of Cu (Ⅱ)by periphyton could be well fitted either by the Freundlich model or Langmuir model; however, the correlation coefficient(R2)for the Langmuir model was higher than that of Freundlich mode in the periphyton + DOM treatment. The adsorption kinetics of Cu(Ⅱ)by periphyton could be well fitted by the Pseudo-Second-order model, and it was not influenced by the addition of DOM. The results of desorption showed that ion exchange and surface complexation were the main binding forces for the adsorption of Cu(Ⅱ)by periphyton. DOM addition decreased the proportion of ion exchange but increased the proportion of surface complexation. |
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