摘要
针对含重金属Sb(Ⅲ)废水处理问题,采用液相还原法制备出高效的还原氧化石墨烯负载纳米零价铁(nZVI/rGO)复合吸附材料,并采用多种技术手段对所制备的nZVI/rGO复合材料进行表征.同时,复合材料中nZVI的负载量、吸附剂投加量、初始pH值以及反应温度等因素对废水中Sb(Ⅲ)吸附去除效果的影响被全面考察,并进一步对吸附过程进行吸附等温线和吸附动力学拟合.结果表明,在25℃,pH为3.0时,当nZVI负载量为70wt%,nZVI/rGO投加量为0.5g/L时,Sb(Ⅲ)的去除率最高,140min内可达99.7%.该吸附过程符合准二级动力学模型与Langmuir等温吸附模型,因此nZVI/rGO被证实是一种高效的Sb(Ⅲ)吸附材料.
To address the problem of heavy metal Sb(Ⅲ) pollution, a liquid phase reduction method was used to prepare a highly efficient reduced graphene oxide supported nano zero-valent iron composite(nZVI/rGO), and the composites were characterized using a variety of technologies. Meanwhile, the influence of loading amounts of nZVI, nZVI/rGO dosages, initial pH values, and reaction temperatures on the adsorption effect of Sb(Ⅲ) was investigated comprehensively. Furthermore, the adsorption isotherm model and the adsorption kinetics model are used to study the removal process of Sb(Ⅲ) by nZVI/rGO. The results show that with a n ZVI loading capacity of 70% and a nZVI/rGO dosage of 0.5g/L at 25℃ and pH=3.0, the maximum Sb(Ⅲ) removal efficiency can reach 99.7%. The adsorption mechanism is well fitted to the quasi-second-order kinetic model and the Langmuir isotherm adsorption model, thus, the nZVI/rGO was demonstrated to be an efficient composite adsorption material.
作者
胡献舟
黄丹莲
HU Xian-zhou;HUANG Dan-lian(Changsha Environmental Protection Vocational and Technical College,Changsha 410004,China;College of Environmental Science and Engineering,Hunan University,Changsha 410082,China)
出处
《中国环境科学》
EI
CAS
CSCD
北大核心
2022年第9期4157-4165,共9页
China Environmental Science
基金
2020年度湖南省环保科研专项(湘财预[2020]001号)
2021年湖南省科技厅创新型省份建设专项(科普专题2021ZK4040)。
关键词
含锑废水
吸附
氧化还原石墨烯
纳米零价铁
去除机理
重金属
Sb-containing wastewater
adsorption
reduced graphene oxide
nano zero-valent iron
removal mechanism
heavy metals
