摘要
采用改进的水热法合成黄铁矿(FeS2),并用于水中五价砷(As(Ⅴ))的吸附固定.利用XRD、SEM对合成的黄铁矿进行了表征,利用XPS对与As(Ⅴ)反应后的黄铁矿表面进行了价态和成分分析,并研究了pH变化和腐殖酸(HA)添加对As(Ⅴ)去除的影响.结果显示,合成的黄铁矿具有较小的粒径(1.6±0.2μm)和较高的比表面积(7.42 m^2/g).FeS2粒子对水中As(Ⅴ)的吸附过程符合准二级动力学.XPS分析结果显示,反应后的黄铁矿表面As(V)和As(Ⅲ)产物共存.在pH为6.0时,黄铁矿对As(Ⅴ)的去除效果最好,去除率达到了99%以上;碱性条件下去除效果较差,pH值为10.0时,As(Ⅴ)的去除率只有48.8%.加入HA后,在pH为10.0时,黄铁矿对As(Ⅴ)的去除效果显著提高,在pH为6.0时,HA添加对As(V)去除有轻微抑制作用.
Pyrite(FeS2)particles were prepared through a modified hydrothermal method to remove the As(Ⅴ)in water system.The synthesized FeS2 particles were characterized using an X-ray diffractometer(XRD)and a scanning electron microscopy(SEM).The FeS 2 surface chemical species and valence states after reacted with As(Ⅴ)were analyzed using a X-ray photoelectron spectroscopy(XPS).Besides,the pH and humic acid(HA)effects on the removal of As(Ⅴ)by FeS2 particles were also tested.The results show that synthesized pyrite particles show a smaller mean hydrodynamic size(1.6±0.2μm)and a larger specific surface area(SSA).The pseudo-second order model better describes the kinetic data of As(Ⅴ)removal by FeS2 particles.The results of XPS analysis show that As(Ⅴ)and As(Ⅲ)products coexist on the surface of pyrite after reaction.The pyrite particles can effectively immobilize As(Ⅴ)with the highest removal rate observed at pH 6.0,where 99% of As(Ⅴ)is removed.The As(Ⅴ)removal rate decreases as the pH increases.Only 48.8% of the As(Ⅴ)are removed at pH 10.The presence of humic acid enhances As(Ⅴ)removal by FeS 2 particles at pH 10.0 and slightly inhibits As(Ⅴ)removal at pH 6.0.
作者
王婷
钱天伟
赵东叶
丁庆伟
霍丽娟
WANG Ting;QIAN Tian-wei;ZHAO Dong-ye;DING Qing-wei;Huo Li-juan(School of Materials Science and Engineering,Taiyuan University of Science and Technology,Taiyuan 030024,China;School of Environment and Safety,Taiyuan University of Science and Technology,Taiyuan 030024,China;College of Environmental Science and Engineering,Taiyuan University of Technology,Jinzhong 030600,China;Department of Civil Engineering,Auburn University,Auburn 36849,USA)
出处
《中北大学学报（自然科学版）》
CAS
2020年第2期154-160,共7页
Journal of North University of China(Natural Science Edition)
基金
国家自然科学基金资助项目(41230638)
山西省科技重大项目(20131101028)
太原科技大学项目(20188010)
太原科技大学博士启动基金项目(20152012)。
关键词
砷
黄铁矿
氧化还原
PH
腐殖酸
arsenic
pyrite
reduction and adsorption
pH
humic acid
