Removal of heavy metals from aqueous systems with thiol functionalized superparamagnetic nanoparticles
Removal of heavy metals from aqueous systems with thiol functionalized superparamagnetic nanoparticles
复制标题
DOI：
10.1021/es0705238
复制
发表时间：
2007-07-15
影响因子：
11.4
通讯作者：
Warner, Marvin G.
中科院分区：
文献类型：
--
作者：
Yantasee, Wassana;Warner, Cynthia L.;Warner, Marvin G.
我们已经表明，超顺磁性氧化铁（Fe 3 O 4）纳米粒子与二巯基丁二酸（DMSA）的表面功能化是一种有效的吸附剂材料的有毒软金属，如汞，银，铅，镉，和Tl，有效地结合到DMSA配体和作为，结合到氧化铁晶格。纳米颗粒在溶液中高度分散和稳定，具有大的表面积（114 m2/g），并具有高官能团含量（1.8 mmol硫醇/g）。它们被磁场吸引，可以在一分钟内用1.2 T磁铁从溶液中分离出来。将磁性纳米颗粒的化学亲和力、容量、动力学和稳定性与在河水、地下水、海水以及人血液和血浆中具有相似表面化学性质的常规树脂基吸附剂（GT-73）、活性炭和纳米多孔二氧化硅（SAMMS）的化学亲和力、容量、动力学和稳定性进行比较。DMSAFe（3）O（4）的汞容量为227 mg/g，是GT-73的30倍。纳米颗粒在一分钟内去除了99wt%的lmg/L的Pb，而Chelex-100和GT-73需要超过10和120分钟才能去除96%的Pb。
We have shown that superparamagnetic iron oxide (Fe3O4) nanoparticles with a surface functionalization of dimercaptosuccinic acid (DMSA) are an effective sorbent material for toxic soft metals such as Hg, Ag, Pb, Cd, and Tl, which effectively bind to the DMSA ligands and for As,which binds to the iron oxide lattices. The nanoparticles are highly dispersible and stable in solutions, have a large surface area (114 m(2)/g), and have a high functional group content (1.8 mmol thiols/g). They are attracted to a magnetic field and can be separated from solution within a minute with a 1.2 T magnet. The chemical affinity, capacity, kinetics, and stability of the magnetic nanoparticles were compared to those of conventional resin based sorbents (GT-73), activated carbon, and nanoporous silica (SAMMS) of similar surface chemistries in river water, groundwater, seawater, and human blood and plasma. DMSAFe(3)O(4) had a capacity of 227 mg of Hg/g, a 30-fold larger value than GT-73. The nanoparticles removed 99 wt % of 1 mg/L Pb within a minute, while it took over 10 and 120 min for Chelex-100 and GT-73 to remove 96% of Pb.