Immobilizing magnetite onto quartz sand for chromium remediation.
Immobilizing magnetite onto quartz sand for chromium remediation.
复制标题
将磁铁矿固定在石英砂上用于铬修复。
DOI：
10.1016/j.jhazmat.2020.123139
复制
发表时间：
2020
影响因子：
13.6
通讯作者：
J. Byrne
中科院分区：
文献类型：
--
作者：
J. Sorwat;A. Mellage;A. Kappler;J. Byrne
磁铁矿纳米颗粒由于其反应性和高表面积而经常被促进作为重金属如铬的修复剂。然而，它们的小尺寸也使它们具有高度移动的性，从而增加了发生反应的污染物被运输到不同地点而不是被安全控制的风险。释放到水生环境中，聚集导致其纳米特性和污染物去除能力的损失。我们将磁铁矿固定在沙子上，以克服这些问题，同时保持反应性。我们将生物成因磁铁矿和非生物成因磁铁矿涂层砂与磁铁矿纳米颗粒进行了比较。磁铁矿涂层大多表现出接近化学计量（0.5）的Fe（II）/Fe（III）比率。我们测试了磁铁矿涂覆的砂吸附铬的功效，相对于生物/非生物纳米颗粒。在测试的浓度范围（10-1000 μM）内，观察到Cr（VI）在磁铁矿（总Fe为4.32 mM）上的Langmuir型吸附。生物纳米颗粒对Cr（VI）的去除潜力最大，最大吸附容量（Qmax）为1250 μmol Cr/g Fe，其次是非生物纳米颗粒，最大吸附容量为693 μmol Cr/g Fe。所有磁铁矿涂层砂表现出类似的吸附行为，平均Qmax在257 - 471 μmol Cr/g Fe之间。这些结果表明，在沙子上涂覆磁铁矿可能比游离纳米颗粒更适合处理环境污染物，如铬。
Magnetite nanoparticles are often promoted as remediation agents for heavy metals such as chromium due to their reactivity and high surface area. However, their small size also makes them highly mobile increasing the risk that reacted pollutants will be transported to different locations rather than being safely controlled. Released to aquatic environments, aggregation leads to a loss of their nano-specific properties and contaminant-removal capacity. We immobilized magnetite onto sand to overcome these issues whilst maintaining reactivity. We compare biogenic magnetite and abiogenic magnetite coated sand against magnetite nanoparticles. Magnetite coatings mostly exhibited a Fe(II)/Fe(III) ratio close to stoichiometry (0.5). We tested the efficacy of the magnetite-coated sand to adsorb chromium, with respect to biogenic/abiogenic nanoparticles. Langmuir-type sorption of Cr(VI) onto magnetite (4.32 mM total Fe) was observed over the tested concentration range (10–1000 μM). Biogenic nanoparticles showed the highest potential for Cr(VI) removal with maximum adsorption capacity (Qmax) of 1250 μmol Cr/g Fe followed by abiogenic nanoparticles with 693 μmol Cr/g Fe. All magnetite coated sands exhibited similar sorption behavior with average Qmaxranging between 257−471 μmol Cr/g Fe. These results indicate coating magnetite onto sand may be more suitable than free nanoparticles for treating environmental pollutants such as chromium.
影响因子：
11.4
作者：
Cutting, Richard S.;Coker, Victoria S.;Lloyd, Jonathan R.
通讯作者：
Lloyd, Jonathan R.
影响因子：
5
作者：
Annette Piepenbrock;U. Dippon;K. Porsch;E. Appel;A. Kappler
通讯作者：
Annette Piepenbrock;U. Dippon;K. Porsch;E. Appel;A. Kappler
影响因子：
4.1
作者：
LEBEL, CP;ISCHIROPOULOS, H;BONDY, SC
通讯作者：
BONDY, SC