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| Surface Characteristics of Four Biochars and Their Adsorption of Cd and Atrazine in Aqueous Solution |
| Received:May 24, 2014 |
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| KeyWord:biochar;pyrolysis;adsorption;cadmium;atrazine |
| Author Name | Affiliation | E-mail | | CAO Mei-zhu | School of Environment, Guangxi University, Nanning 530004, China | | | PAN Li-ping | Agricultural College, Guangxi University, Nanning 530004, China | | | ZHANG Chao-lan | School of Environment, Guangxi University, Nanning 530004, China | zhangcl@gxu.edu.cn | | YANG Wei-wei | School of Environment, Guangxi University, Nanning 530004, China | | | WEI Jia-ming | School of Environment, Guangxi University, Nanning 530004, China | | | ZHANG Fei-long | School of Environment, Guangxi University, Nanning 530004, China | | | WEI Yan-hong | School of Environment, Guangxi University, Nanning 530004, China | |
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| Abstract: |
| Biochars have recently been used to remediate water contaminated by heavy metals and organic pollutants. In this paper, four biochars derived from organic wastes(sugarcane top, cassava stem, rice straw and silkworm excrement) collected from Guangxi were selected to examine their pore structure by Scanning Electron Microscope(SEM), type and quantity of total oxygen-containing functional groups via Fourier Transform Infrared Spectroscopy(FTIR) and Boehm titration, and adsorption characteristics of Cd2+ and atrazine(AT) at different initial concentrations of Cd and AT and different pH values. Biochars obtained at high pyrolytic temperature(700 ℃) had more pores and basic functional groups but fewer acid functional groups than those at low pyrolytic temperature(300 ℃). The adsorption of Cd and AT by the biochars could be well characterized with pseudo-second-order kinetic model. The Cd and AT adsorption increased with initial concentrations of Cd and AT. The adsorption efficiencies of Cd and AT were greater for biochars at 700 ℃ than 300 ℃. Biochars adsorbed more Cd but less AT at pH 6 than pH 4. Rice straw- and silkworm excrement-derived biochars had greater adsorption capacity for Cd2+, while sugarcane top derived-biochar had more adsorption for AT. |
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