Removal of nitrate nitrogen by nanoscale zero-valent iron supported on modified diatomite

被引：0

作者：

Xiu R. ^{[1
,2
]}

He S. ^{[2
]}

Song H. ^{[1
]}

Yang L. ^{[2
]}

Zhang W. ^{[2
]}

机构：

[1] School of Energy and Environment, Southeast University, Nanjing, 210096, Jiangsu

[2] Institute of Agricultural Resources and Environment, Jiangsu Academy of Agricultural Sciences, Nanjing, 210014, Jiangsu

来源：

Huagong Xuebao/CIESC Journal | 2016年 / 67卷 / 09期

基金：

中国国家自然科学基金;

关键词：

Composites; Kinetics; Modified diatomite; Nanomaterials; Nitrate nitrogen; Removal efficiency;

D O I：

10.11949/j.issn.0438-1157.20160412

中图分类号：

学科分类号：

摘要：

With modified diatomite as support, the composite materials of nanoscale zero-valent iron and modified diatomite (NZVI-CDt) were prepared by using sodium borohydride as reducing agent via the liquid phase reduction method. The NZVI-CDt was characterized by X-ray diffraction (XRD), scanning electron microscope (SEM) and X-ray photoelectron spectroscopy (XPS). The influences of initial concentrations of nitrate nitrogen (5-30 mg·L-1) and pH (3, 5, 7 and 9) on removal of nitrate nitrogen were investigated, and the final degradation products were detected. The results showed that the iron nanoparticles were highly dispersed on the surface of diatomite and several iron nanoparticles were embedded within the diatomite porous. Iron nanoparticles had a nearly spherical shape with the range of 100 nm. The NZVI-CDt showed efficient removal of nitrate nitrogen. The removal efficiency could reach 90.1% after 60 min at proper conditions: pH 7, initial 20 mg·L-1 concentration of nitrate nitrogen and 0.5141 g NZVI-CDt at the room temperature. Kinetic studies showed that the reduction of nitrate nitrogen by NZVI-CDt followed the pseudo-first-order kinetics. In addition, kobs decreased with increasing nitrate nitrogen concentration. © All Right Reserved.

引用

页码：3888 / 3894

页数：6

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