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| Aminized pig biochar and its removals of trace Cu(Ⅱ) and Cu(Ⅱ)-Cit from aqueous solution |
| Received:March 30, 2016 |
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| KeyWord:adsorption;amine group;pig carbonization material;Cu(Ⅱ);Cu(Ⅱ)-Cit;complexation |
| Author Name | Affiliation | E-mail | | FU Rui-qi | Department of Environmental Engineering, Zhejiang University, Hangzhou 310058, China | | | LIU Yu | Department of Environmental Engineering, Zhejiang University, Hangzhou 310058, China | | | LOU Zi-mo | Department of Environmental Engineering, Zhejiang University, Hangzhou 310058, China | | | SUN Yue | Department of Environmental Engineering, Zhejiang University, Hangzhou 310058, China | | | ZHOU Xiao-xin | Department of Environmental Engineering, Zhejiang University, Hangzhou 310058, China | | | WANG Zhuo-xing | Department of Environmental Engineering, Zhejiang University, Hangzhou 310058, China | | | XU Xin-hua | Department of Environmental Engineering, Zhejiang University, Hangzhou 310058, China | xuxinhua@zju.edu.cn |
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| Abstract: |
| Aminized pig biochar(PCM@SiO2-NH2) was prepared via a co-condensation process to enhance its removals of trace Cu(Ⅱ) and Cu(Ⅱ)-Cit from aqueous solutions. SEM, EDX, FTIR and XPS were employed to investigate the morphological, structural and chemical composition of modified/unmodified pig biochar. The adsorption performance and influencing factors of PCM@SiO2-NH2 for Cu(Ⅱ) and Cu(Ⅱ)-Cit adsorption were studied. The possible adsorption mechanisms of Cu(Ⅱ) and Cu(Ⅱ)-Cit on PCM@SiO2-NH2 were extensively analyzed. High removal efficiencies of Cu(Ⅱ) and Cu(Ⅱ)-Cit by PCM@SiO2-NH2 were found. Moreover, higher removal efficiencies were achieved by increasing amount of adsorbent. PCM@SiO2-NH2 showed the maximum adsorption capacity of 25.3 mg·g-1 and 5.6 mg·g-1 for Cu(Ⅱ) and Cu(Ⅱ)-Cit, respectively. The adsorption data of Cu(Ⅱ) and Cu(Ⅱ)-Cit were fitted well to the Langmuir isotherm model. Solution pH was one of the most important factors influencing adsorption process. The optimum initial pH was 6.0. The adsorption mechanism of Cu(Ⅱ) and Cu(Ⅱ)-Cit included complexation adsorption, electrostatic attraction and ion-exchange. Complexation adsorption mechanism was prominent in Cu(Ⅱ)/Cu(Ⅱ)-Cit adsorption on PCM@SiO2-NH2 under the presence of amino groups. |
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