期刊论文

The adsorption behavior and mechanism of cadmium by diatomite-supported nano-iron

中文

环境科学学报

0253-2468

2019

39

12

3994-4003

10.13671/j.hjkxxb.2019.0322

No.21707169:国家自然科学基金 No.2016YFD0800805-4:国家重点研发计划 No.2017SK2273:湖南省重点研发计划项目 2016SK2030:湖南省重点研发计划项目

本校为第一机构

为了提高硅藻土(CDt)的吸附能力,采用NaBH4液相还原二价铁法合成负载纳米铁的硅藻土颗粒(nZVI-CDt),运用扫描电镜(SEM)、傅里叶红外光谱(FTIR)、X射线衍射(XRD)和X射线光电子能谱(XPS)对nZVI-CDt进行表征,采用静态吸附法研究不同吸附条件对CDt和nZVI-CDt吸附Cd~(2+)的影响,并结合等温吸附属性、吸附过程控制步骤以及吸附动力学、热力学属性分析探讨了CDt和nZVI-CDt对Cd~(2+)的吸附机制.结果表明,负载纳米铁后,硅藻土的团聚现象得到改善,分散性更好,表面活性基团向有利于吸附方向发生变化,吸附能力得到显著提升,相对于CDt,nZVI-CDt对Cd~(2+)的吸附量提升了3.9倍;nZVI-CDt对Cd~(2+)的吸附较为迅速...

In order to improve the adsorption capacity of diatomite, diatomite particles were loaded with nano-zero valent iron (nZVI-CDt), which were synthesized by NaBH4 liquid phase reduction of Fe (II). The physicochemical structure of the diatomite particles was analyzed using scanning electron microscopy(SEM), fourier transform infrared spectroscopy (FTIR), X-ray diffraction (XRD) and X-ray photoelectron spectroscopy (XPS). Under various adsorption conditions, the performance of two types of the diatomite on the adsorption of Cd2+ was assessed by st...