生态与农村环境学报2018，Vol.34Issue(4)：356-362,7.DOI:10.11934/j.issn.1673-4831.2018.04.009
改性水生植物生物炭对低浓度硝态氮的吸附特性
Adsorption Characteristics of Low Concentration Nitrate-Nitrogen Onto Modified Macrophytes Biochar
摘要
Abstract
To remove the low concentration nitrate in water and eliminate eutrophication,the biochar was prepared from three kinds of macrophytes,including Thalia dealbata,Typha orientalis and Phragmites australis,and then were modified by ferric chloride.FTIR and SEM-EDS results of the biochar and equilibrium adsorption tests show that the Fe-O was formed on the surface of the modified biochar which greatly enhanced biochar's adsorption performance to the nitrate-nitrogen.The nitrate was absorbed rapidly in 4 hours and then reached equilibrium slowly in 24 hours.The equilibrium adsorption capacity of the modified Typha orientalis biochar was the highest,which reached up to 1.747 mg · g-1.The adsorption performance of low concentration nitrate onto three kinds of modified macrophytes biochar fitted well to pseudo-secondorder equation and Freundlich equation,indicating that inhomogeneous polymolecular layer chemisorption occurred on the surface of modified biochar.The initial pH of the solution in the range of 3.0-9.0 has little effect on the adsorption performance of nitrate,and the most appropriate pH is neutral.At the initial nitrate-nitrogen concentration of 2 mg · L-1,the most appropriate dosages of the three kinds of modified macrophytes biochar are 1.50,1.14,and 1.22 g · L-1 for iron modified biochar of Thalia dealbata,Typha orientalis and Phragmites australis,respectively.Therefore,the iron modified macrophytes biochar can not only effectively remove the nitrate-nitrogen in water,but also realize resource utilization of the macrophytes,which has a promising application prospect.关键词
生物炭/水生植物/吸附/改性/低浓度硝态氮Key words
biochar/hydrophyte/adsorption/modification/low concentration nitrate-nitrogen分类
资源环境引用本文复制引用
李三姗,王楚楚,何晓云,任丽曼,郭琼,杨柳燕..改性水生植物生物炭对低浓度硝态氮的吸附特性[J].生态与农村环境学报,2018,34(4):356-362,7.基金项目
国家水体污染控制与治理科技重大专项(2017ZX07204) （2017ZX07204）
