水生植物制生物炭对硝态氮的吸附规律研究

发布时间：2018-01-16 00:16

本文关键词：水生植物制生物炭对硝态氮的吸附规律研究　出处：《中国环境科学》2017年01期 　论文类型：期刊论文

【摘要】：为在高纬度地区秋季温度条件下研究一种高效以及低值的技术去移除人工湿地中的硝酸盐氮,在秋季人工湿地中收集水生植物枯落物芦苇以及香蒲制备生物炭,并利用盐酸进行改性.通过序批实验,研究了改性水生植物生物炭对硝酸盐氮的吸附性能及影响因素,探讨了其吸附机理.结果表明,经盐酸改性的芦苇生物炭MRB与香蒲生物炭MCB表面均带正电荷,Zeta电位分别为+5.46mV与+2.31mV.MRB与MCB对硝酸盐氮吸附行为更符合准二级动力学方程(R~20.99),等温吸附曲线更好拟合Freundlich方程(R~20.98).MRB及MCB对硝酸根的最大吸附量Q_m分别为14.6661mg/g与5.5559mg/g.批量吸附实验也表明,溶液初始pH和共存阴离子会影响改性水生植物生物炭吸附硝酸盐.改性水生植物生物炭可以有效地去除来自于在秋季高纬度地区人工湿地污水中的硝酸盐.
[Abstract]:In order to study an efficient and low value technique to remove nitrate nitrogen from constructed wetland in high latitudes, biocharcoal was collected from aquatic plant litter Reed and cattail in autumn constructed wetland. The adsorption properties of modified aquatic plant biochar to nitrate nitrogen and its adsorption mechanism were studied by using hydrochloric acid. The surface of Reed biochar MRB and cattail biochar MCB modified by hydrochloric acid has positive charge. Zeta potential was 5.46mV and 2.31mV.MRB and 2.31mV.MRB, respectively, and the adsorption behavior of nitrate nitrogen was more in accordance with the quasi-second-order kinetic equation RV 20.99). The isothermal adsorption curve is better fitted to the Freundlich equation RN 20.98). The maximum adsorption quantity of nitrate for MRB and MCB was 14.6661 mg / g and 5.5559 mg / g, respectively. The initial pH of the solution and the coexistence of anions will affect the adsorption of nitrate by the modified aquatic plant biochar, which can effectively remove the nitrate from the sewage from the constructed wetland in the high latitude area in autumn.
【作者单位】：辽宁石油化工大学生态环境研究院;中国环境科学研究院湖泊工程技术中心环境基准与风险评估国家重点实验室;
【基金】：国家自然科学基金资助项目(41401616)
【分类号】：X703
【正文快照】： 国环境科学研究院,湖泊工程技术中心,环境基准与风险评估国家重点实验室,北京100012)随着社会经济的快速发展,大量废水和农田径流排入自然水体,导致水体硝酸盐氮含量升高,富营养化问题日趋严重[1],长期饮用硝酸盐含量超标的水体将会对人类健康产生不利影响[2-3].人工湿地作为

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