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| 刺桐生物炭对水中氨氮和磷的吸附 |
| The Erythrina Variegate Biochar's Adsorption to NH4+-N and P from Aqueous Solution |
| 投稿时间：2017-04-26 修订日期：2017-09-25 |
| DOI：10.13254/j.jare.2017.0111 |
| 中文关键词: 生物炭，热解温度，氨氮，磷，吸附 |
| 英文关键词: biochar, pyrolysis temperature, ammonia nitrogen, phosphorus, adsorption |
| 基金项目:中央高校基金资助项目（CDJZR14215501） |
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| 中文摘要: |
| 本研究以园林绿化废弃物刺桐为原料，在不同的热解温度下（300、500、700 ℃）制备生物炭，用动力学方程和等温吸附方程分别拟合生物炭对氨氮和磷的吸附性能。等温吸附方程拟合结果表明：生物炭对水中氨氮和磷的吸附量均随着氨氮和磷的初始浓度的增加而增大，且均能较好地拟合Langmuir吸附方程，且BC500吸附效果最好；动力学方程拟合结果表明：不同热解温度下得到的生物炭对氨氮和磷的吸附速率较快的过程分别发生在最初的300 min和60 min内，且均能较好地拟合准二级动力学方程；此外，生物炭对不同初始pH下对氨氮和磷溶液的吸附效果分别为pH7 > pH11 > pH3和pH11 > pH7 > pH3。 |
| 英文摘要: |
| The biochar derived from Erythrina Variegate which was pyrolyzed at the temperature of 300℃, 500℃ and 700℃ was employed to investigate its adsorption property to NH4+-N and P by kinetics and isothermal adsorption equation. The results of isothermal adsorption model showed that the Langmuir equation fitted the data very well and the adsorption amount increased with the increase of initial concentration of NH4+-N and P. Besides, the BC500 had the best adsorption effect. The results of kinetics model showed that the adsorption process of biochar pyrolyzed at different temperatures to NH4+-N and P were concentrated in the initial 300 min and 60 min, respectively. They all fitted the pseudo-second order kinetic equation well. Besides, in different initial pH, the adsorption effects of biochar to NH4+-N and P in aqueous solutions were pH7 > pH11 > pH3 and pH11 > pH7 > pH3, respectively. |
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