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| DOI： |
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| Absorption of Cd2+ at Low Concentration by Wheat Straw and Wheat Straw Derived-biochar |
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GAO Qing, QI Xuebin, ZHAO Zhijuan, LI Zhongyang, FAN Tao
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Farmland Irrigation Research Institute of CAAS, Xinxiang 453002, China; Agriculture Water and Soil Environmental Field Science Station of Xinxiang City He’nan Province of CAAS, Xinxiang 453002, China; Key Laboratory of High-efficient and Safe Utilization of Agriculture Water Resource of CAAS, Xinxiang 453002, China
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| Abstract: |
| Wheat straw and wheat straw derived-biochar were taken as the research object. Adsorption property and its influential factors of Cd2+ at low concentration to the wheat straw and wheat straw derived-biochar in aqueous solution were investigated. The results indicated that adsorption isotherm fit well with Langmiur equation, adsorption equilibrium of Cd2+on wheat straw and wheat straw derived-biochar almost reached in 10 minutes. Under the experimental condition, the removal rate of Cd2+ on biochar was over 90%, which was 70% on wheat straw. There was significant effect of pH values on adsorption of Cd2+ by the biochar and wheat straw, temperature had effects on adsorption of Cd2+ by wheat straw, but there was no significant effect of temperature on adsorption of Cd2+ by the biochar. When 0.5 g/L wheat straw or biochar were used, there was no effect of different dosing quantity on adsorption of Cd2+ by wheat straw and its derived-biochar. |
| Key words: wheat straw; absorption; biochar; Cd2+ |
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