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| Effect of low molecular weight organic acids on Cu(Ⅱ) adsorption by biochars |
| Received:March 23, 2016 |
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| KeyWord:biochar;oxalic acid;citric acid;Cu(Ⅱ);adsorption |
| Author Name | Affiliation | E-mail | | ZHOU Dan-dan | Faculty of Environmental Science and Engineering, Kunming University of Science and Technology, Kunming 650500, China | | | LIANG Ni | Faculty of Environmental Science and Engineering, Kunming University of Science and Technology, Kunming 650500, China | | | LI Hao | Faculty of Environmental Science and Engineering, Kunming University of Science and Technology, Kunming 650500, China | | | ZHANG Di | Faculty of Environmental Science and Engineering, Kunming University of Science and Technology, Kunming 650500, China | | | WU Min | Faculty of Environmental Science and Engineering, Kunming University of Science and Technology, Kunming 650500, China | kustless@gmail.com | | PAN Bo | Faculty of Environmental Science and Engineering, Kunming University of Science and Technology, Kunming 650500, China | |
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| Abstract: |
| Effect of low molecular weight organic acids on adsorption of Cu(Ⅱ) by biochars was investigated using indoor experiment. The results showed that the sorption of Cu(Ⅱ) in biochar was prompted by citric acid at low concentrations(below 10 mg·L-1), but inhibited at high concentrations. The adsorption of citric acid on biochars provided more adsorption sites for Cu(Ⅱ) at low citric acid concentration, while the increased citric acid loading on biochars may block the internal pores in biochars. The oxalic acid inhibited the adsorption of Cu(Ⅱ) on biochars at the tested concentrations(0.5~50 mg·L-1). This result may be explained by the strong complexation between oxalic acid with Cu(Ⅱ) in the aqueous phase, and the competition between oxalic acid and Cu(Ⅱ) for adsorption sites(such as the oxygen-containing functional groups, and the internal pores of biochar) on solid particles. |
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