摘要
为了解决水体中Pb(Ⅱ)污染问题,利用SiO_2和半胱氨酸(Cys)对Fe_3O_4纳米粒子进行表面修饰,并用于水中Pb(Ⅱ)的去除研究。实验结果表明,Fe_3O_4@SiO_2@Cys的吸附效果明显优于另外两种未修饰Cys的磁性纳米材料(Fe_3O_4和Fe_3O_4@SiO_2)。当Fe_3O_4@SiO_2@Cys投加量为1.0g/L,pH=6.0,Pb(Ⅱ)初始质量浓度为100mg/L,吸附时间为30min时,水中Pb(Ⅱ)去除率可达到95%以上。在Cd(Ⅱ)、Cu(Ⅱ)、Zn(Ⅱ)共存条件下,Fe_3O_4@SiO_2@Cys对Pb(Ⅱ)的吸附效果明显优于其他3种金属离子。经5次循环使用后,Fe_3O_4@SiO_2@Cys对Pb(Ⅱ)的去除率仍保持在80%左右。
In order to solve the problem of Pb(Ⅱ)pollution,SiO 2 and L-cysteine(Cys)were applied to modify the Fe 3O 4.The composites were applied to removing Pb(Ⅱ)in water.Adsorption results demonstrated that the Fe 3O 4@SiO 2@Cys showed better adsorption capacity than Fe 3O 4 and Fe 3O 4@SiO 2.The removing rate of Pb(Ⅱ)from water was more than 95%when the adsorbent dosage was 1.0 g/L,pH 6.0,Pb(Ⅱ)initial mass concentration 100 mg/L,and adsorbing time 30 min.In addition,compared with Cu(Ⅱ),Cd(Ⅱ)and Zn(Ⅱ),the adsorbent showed better adsorption capacity for Pb(Ⅱ).The desorption and regeneration studies showed that the adsorption efficiency of Fe 3O 4@SiO 2@Cys remained at 80%after 5 cycles.
作者
江辉
王荣忠
黄丹莲
曾光明
许飘
赖翠
晏铭
陈国敏
徐娟娟
JIANG Hui;WANG Rongzhong;HUANG Danlian;ZENG Guangming;XU Piao;LAI Cui;YAN Ming;CHEN Guomin;XU Juanjuan(College of Environmental Science andEngineering,Hunan University,Changsha Hunan 410082;Key Laboratory of Environmental Biology and PollutionControl (Hunan University),Ministry of Education,Changsha Hunan 410082)
出处
《环境污染与防治》
CAS
CSCD
北大核心
2019年第2期191-195,共5页
Environmental Pollution & Control
基金
国家自然科学基金资助项目(No.51579098
No.51408206
No.51521006
No.51278176
No.51378190)
