摘要
采用改进的化学共沉淀法制备纳米Fe3O4颗粒,利用3-巯丙基三乙氧基硅烷(MPTES)和胡敏酸(HA)对所制备的纳米Fe3O4进行巯基修饰和胡敏酸包裹,通过红外光谱(IR)、X射线衍射分析(XRD)等方法对上述制备的纳米颗粒的性质进行了表征,同时对上述不同的纳米Fe3O4颗粒在恒温下对水体中金属离子(Pb2+、Cd2+、Cu2+)的吸附进行了研究。结果表明,所制备的功能化前后的纳米Fe3O4纯度较高,平均粒径约为20～30nm,且分布均匀。不同纳米型Fe3O4颗粒对溶液中金属离子具有较好的吸附性能,其吸附等温线均可以用Langmuir方程进行较好的拟合;裸露的纳米Fe3O4颗粒对Pb2+最大吸附量(b)达到172.4mg·g-1,经过胡敏酸包裹后的纳米Fe3O4颗粒对Cd2+、Cu2+的最大吸附量分别增加了75.8%和231.5%;对不同金属离子而言,裸露的和巯基修饰的纳米Fe3O4对3种重金属离子的吸附能力的强弱为Pb2+>Cd2+>Cu2+,而经胡敏酸包裹后的顺序则为Pb2+>Cu2+>Cd2+;与裸露的和巯基修饰的纳米Fe3O4相比,经HA包裹的纳米Fe3O4对Cd2+和Cu2+具有较高的吸附量和吸附亲和力参数,而对Pb2+的吸附无显著性差异。
The magnetic Fe3O4 nanoparticles were prepared using modified chemical co-precipitation,and corresponding thiolated and coating nanoparticles were also obtained via surface mercaptopropyltriethoxysilane（MPTES） modification and humic acid（HA）.The properties and structure of the nanoparticles were characterized by X-Ray diffraction（XRD） and infrared spectroscopy（IR） etc.The application of the nanoparticles to the adsorption of aqueous Pb2＋,Cd2＋,Cu2＋ were also investigated in this study.The results showed that the average size of prepared nanoparticles were about 20~30 nm with homogeneous distribution;the nanoparticles could adsorb Pb2＋,Cd2＋,Cu2＋ in solution efficiently and the adsorption data were well fitted with the Langmuir isotherm.The sorption maxima of nano-Fe3O4 to Pb2＋ reached 172.4 mg·g-1,the sorption maxima of Fe3O4/HA to Cd2＋,Cu2＋ increased by 75.8% and 231.5% as compared with that of Fe3O4 nanoparticles.The adsorption of Fe3O4 and Fe3O4/MPTES to metal ions followed the order Pb2＋Cd2＋Cu2＋,but Fe3O4/HA followed the order Pb2＋Cu2＋Cd2＋;the coating of humic acid with Fe3O4 nanoparticles could obviously improve its adsorption capacity for Cd2＋ and Cu2＋ in solution,but marginal effect was observed for Pb2＋.
出处
《农业环境科学学报》
CAS
CSCD
北大核心
2011年第8期1669-1674,共6页
Journal of Agro-Environment Science
基金
国家"863"计划项目(2008AA10Z404
2006AA06Z360)
云南省烟草公司项目(08A03
09YN006
10YN16)
