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| Study on the adsorption properties of nitrogen by different biochars |
| Received:October 12, 2017 |
| View Full Text View/Add Comment Download reader |
| KeyWord:biochar;nitrogen adsorption;isothermal adsorption model;nitrogen pollution |
| Author Name | Affiliation | E-mail | | SUO Gui-fang | College of Chemistry and Life Sciences, Zhejiang Normal University, Jinhua 321004, China
Institute of Environment, Resource, Soil and Fertilizer, Zhejiang Academy of Agricultural Sciences, Hangzhou 310021, China | | | LÜ Hao-hao | Institute of Environment, Resource, Soil and Fertilizer, Zhejiang Academy of Agricultural Sciences, Hangzhou 310021, China
Engineering Research Center of Biochar of Zhejiang Province, Hangzhou 310021, China | | | WANG Yu-ying | Institute of Environment, Resource, Soil and Fertilizer, Zhejiang Academy of Agricultural Sciences, Hangzhou 310021, China
Engineering Research Center of Biochar of Zhejiang Province, Hangzhou 310021, China | | | LIU Yu-xue | Institute of Environment, Resource, Soil and Fertilizer, Zhejiang Academy of Agricultural Sciences, Hangzhou 310021, China
Engineering Research Center of Biochar of Zhejiang Province, Hangzhou 310021, China | | | HE Li-li | Institute of Environment, Resource, Soil and Fertilizer, Zhejiang Academy of Agricultural Sciences, Hangzhou 310021, China
Engineering Research Center of Biochar of Zhejiang Province, Hangzhou 310021, China | | | YANG Sheng-mao | College of Chemistry and Life Sciences, Zhejiang Normal University, Jinhua 321004, China
Institute of Environment, Resource, Soil and Fertilizer, Zhejiang Academy of Agricultural Sciences, Hangzhou 310021, China
Engineering Research Center of Biochar of Zhejiang Province, Hangzhou 310021, China | yangshengmao@263.net |
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| Abstract: |
| This paper explored the adsorption properties of nitrogen by different biochars and identified a suitable material to prevent nitrogen pollution. The project selected three kinds of nitrogen adsorbents:rice husk biochar, pecan shell biochar and bamboo biochar. Adsorption experiments, coupled with isothermal adsorption models and kinetic models, were applied to assess the optimum adsorption conditions of the selected biochar on nitrogen in ammonium nitrate solution. The results demonstrated that all three kinds of biochar had certain adsorption effects on nitrogen in ammonium nitrate solution, and that the adsorption capacity of biochar on nitrogen was affected by the pH of the environment, reaction time, initial concentration and biochar addition. For instance, while the amount of biochar was 0.05 g under experimental conditions of pH 9, adsorption time 3 h and initial concentration 100 mg·L-1, the optimum nitrogen adsorption quantities of the three biochars were 23.79, 13.00 mg·g-1, and 17.60 mg·g-1, respectively. Moreover, the Langmuir equation best fit the process of isothermal adsorption of nitrogen by the three kinds of biochar, indicating that the adsorption of nitrogen by biochar was due mainly to monomolecular adsorption. Again, the pseudo-second-order kinetics model could better define the kinetics of the three kinds of biochar adsorption nitrogen, was suggesting that the biochar adsorption of nitrogen was chemical in nature. The results showed, that rice husk biochar had a good nitrogen adsorption performance and could be used as a quality adsorbent to control nitrogen pollution in soil and water. |
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