Effect of Enteromorpha prolifera Biochar on the Adsorption Characteristics and Adsorption Mechanisms of Ammonia Nitrogen in Rainfall Runoff

被引：4

作者：

Chen Y.-Y. ^{[1
,2
,3
]}

Li P.-Q. ^{[1
]}

Li X.-C. ^{[4
]}

Sun P. ^{[1
]}

Zhao X.-Y. ^{[1
]}

Li J. ^{[1
]}

Xin Z.-R. ^{[1
]}

机构：

[1] College of Environmental Science and Engineering, Ocean University of China, Qingdao

[2] Key Laboratory of Marine Environment and Ecology, Ministry of Education, Ocean University of China, Qingdao

[3] Shandong Provincial Key Laboratory of Marine Environment and Geological Engineering, Ocean University of China, Qingdao

[4] Qingdao No.9 High School, Qingdao

来源：

Huanjing Kexue/Environmental Science | 2021年 / 42卷 / 01期

关键词：

Adsorption characteristics; Adsorption mechanism; Bioretention pond; Enteromorpha prolifera biochar; NH[!sub]4[!/sub][!sup]+[!/sup]-N;

D O I：

10.13227/j.hjkx.202004051

中图分类号：

学科分类号：

摘要：

In order to study the performance and mechanisms of bioretention pond media (Enteromorpha prolifera biochar) for NH4+-N removal in rainfall runoff, three kinds of alkali modified biochars (marked as BC1, BC2, and BC3) were prepared with various concentrations of NaOH solution (1, 2, and 3 mol•L-1) to explore their adsorption performance for NH4+-N. The results showed that: ① Appropriate modifications of the NaOH concentration increased the specific surface area and surface microstructure of biochar, with the content of O and the surface functional groups being enriched. In addition, BC2 possessed the best adsorption performance. ② The adsorption capacity reached a maximum when the pH was 9.0 and the dosage of biochar was 0.5 g•L-1. Compared with BC, the adsorption capacity of BC1 and BC2 increased by 6.4% and 10.8%, respectively, while BC3 decreased by 13.7%. Moreover, BC2 had an optimal adsorption efficiency with a saturated adsorption capacity of 16.76mg•g-1. ③ The adsorption mechanism of biochar belonged to chemical adsorption with a monomolecular layer. The adsorption process was promoted by the high pH of biochar, the electrostatic attraction of biochar pores, the complexation and oxidization of the functional groups of hydroxyl (-OH), carboxyl (-COOH), and carbon-oxygen single bond (C-O). To sum up, the proper amount of NaOH to modify biochar can improve the adsorption performance of NH4+-N, and the modified biochar can be used as media of the bioretention pond to remove NH4+-N. © 2021, Science Press. All right reserved.

引用

页码：274 / 282

页数：8

共 41 条

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