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

XIU Ruirui; HE Shiying; SONG Hailiang; YANG Linzhang; ZHANG Wan

doi:10.11949/j.issn.0438-1157.20160412

您当前的位置：

首页 >

文章列表页 >

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

更新时间：2025-12-10

- Removal of nitrate nitrogen by nanoscale zero-valent iron supported on modified diatomite
- CIESC Journal Issue 9, Pages: 3888-3894(2016)
- 作者机构：
  
  1. 东南大学能源与环境学院,江苏,南京,210096
  2. 江苏省农业科学院农业资源与环境研究所,江苏,南京,210014
- 作者简介：
- 基金信息：
- DOI：10.11949/j.issn.0438-1157.20160412
  CLC： 52
- Online First：05 September 2016，
  
  Published：05 September 2016
- 稿件说明：
移动端阅览
XIU Ruirui, HE Shiying, SONG Hailiang, et al. Removal of nitrate nitrogen by nanoscale zero-valent iron supported on modified diatomite[J]. CIESC Journal, 2016, (9): 3888-3894.
DOI：

XIU Ruirui, HE Shiying, SONG Hailiang, et al. Removal of nitrate nitrogen by nanoscale zero-valent iron supported on modified diatomite[J]. CIESC Journal, 2016, (9): 3888-3894. DOI： 10.11949/j.issn.0438-1157.20160412.

摘要

以改性硅藻土为载体，采用硼氢化钠液相还原法制备了硅藻土负载的纳米铁（NZVI-CDt，nanoscale zero-valent iron supported on modified diatomite）复合材料。结果表明，所制得的纳米零价铁颗粒呈球形，粒径小于100 nm，均匀分散在改性硅藻土表面，部分纳米铁颗粒镶嵌在硅藻土孔隙内。NZVI-CDt能高效去除水体中NO3--N，当pH=7，温度为25℃，初始浓度为20 mg·L-1，NZVI-CDt复合材料投加量为0.5141 g，反应60 min时，NZVI-CDt对NO3--N的去除率达到90.1%。NZVI-CDt去除NO3--N的反应符合准一级反应动力学方程，反应速率常数kobs随着NO3--N初始浓度的增加而呈现下降的趋势。

Abstract

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

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.

关键词

Keywords

references

Views

320

下载量

CSCD

Alert me when the article has been cited

提交

Tools

Publicity Resources

Enhanced sodium-ion multilayer adsorption performance of sulfur-functionalized M2N-type Mxene

Cu cation vacancies enhance the lithium storage performance of perovskite-type high-entropy oxides

Study on electromagnetic wave absorption properties of Fe3O4/FeNi/CNT composites with magnetic-dielectric loss

Construction and catalytic application of immobilized lipase microreactors based on cMOFs for the synthesis of mandelic acid

Preparation and lithium storage performance of K+-doped spinel (Co0.2Cr0.2Fe0.2Mn0.2Ni0.2)3O4 high-entropy oxide anode materials

Related Author

CAO Yu

DU Xinyu

GAO Ang

LIANG Kang

CAI Yongmao

PANG Jinbo

ZHOU Jing

XU Shibiao

Related Institution

Key Laboratory of Modern Power System Simulation and Control & Renewable Energy Technologies (Northeast Electric Power University), Ministry of Education

School of Electrical Engineering, Northeast Electric Power University

School of Science, Northeast Electric Power University

Institute of Frontier and Interdisciplinary Science, University of Jinan

School of Chemical Engineering, Northeast Electric Power University

⁰