磁性磁铁矿（Fe3O4）纳米颗粒的合成及其在去除水中铅（Pb2+）和铬（Cr6+）方面的应用。
Magnetic magnetite (Fe3O4) nanoparticle synthesis and applications for lead (Pb2+) and chromium (Cr6+) removal from water.
作者信息
Rajput Shalini, Pittman Charles U, Mohan Dinesh
机构信息
School of Environmental Sciences, Jawaharlal Nehru University, New Delhi 110067, India.
Department of Chemistry, Mississippi State University, Mississippi State, MS 39762, USA.
出版信息
J Colloid Interface Sci. 2016 Apr 15;468:334-346. doi: 10.1016/j.jcis.2015.12.008. Epub 2015 Dec 14.
Magnetic magnetite (Fe3O4) nanoparticles synthesized by chemical co-precipitation were characterized using XRD, TEM, SEM-EDX, FT-IR, ED-XRF, PPMS, point of zero charge (pHpzc) and surface area measurements. As-prepared Fe3O4 nanoparticles were successful for aqueous Cr(6+) and Pb(2+) removal. Batch adsorption experiments systematically investigated the influence of pH, temperature, contact time and adsorbate/adsorbent concentration on Cr(6+) and Pb(2+) adsorption. Maximum Cr(6+) and Pb(2+) removal occurred at pH 2.0 and 5.0, respectively. Sorption data fit pseudo-second order kinetics, indicating a chemical adsorption. The Freundlich, Langmuir, Redlich-Peterson, Toth, Radke and Sips adsorption isotherm models were applied to describe equilibrium data. The Sips and Langmuir models best described Cr(6+) and Pb(2+) adsorption on magnetite nanoparticles, respectively. The maximum Langmuir adsorption capacities were 34.87 (Cr(6+)) and 53.11 (Pb(2+))mg/g at 45°C, respectively. Fe3O4 nanoparticles are promising potential adsorbents and exhibited remarkable reusability for metal ions removal in water and wastewater treatment.
采用化学共沉淀法合成的磁性磁铁矿（Fe3O4）纳米颗粒，通过X射线衍射（XRD）、透射电子显微镜（TEM）、扫描电子显微镜-能谱仪（SEM-EDX）、傅里叶变换红外光谱（FT-IR）、能量色散X射线荧光光谱（ED-XRF）、物理性能测量系统（PPMS）、零电荷点（pHpzc）和比表面积测量等手段进行了表征。制备的Fe3O4纳米颗粒成功用于去除水溶液中的Cr(6+)和Pb(2+)。分批吸附实验系统研究了pH值、温度、接触时间以及吸附质/吸附剂浓度对Cr(6+)和Pb(2+)吸附的影响。Cr(6+)和Pb(2+)的最大去除率分别出现在pH值为2.0和5.0时。吸附数据符合准二级动力学，表明是化学吸附。应用Freundlich、Langmuir、Redlich-Peterson、Toth、Radke和Sips吸附等温线模型来描述平衡数据。Sips模型和Langmuir模型分别最能描述Cr(6+)和Pb(2+)在磁铁矿纳米颗粒上的吸附情况。在45°C时，Langmuir最大吸附容量分别为34.87（Cr(6+)）和53.11（Pb(2+)）mg/g。Fe3O4纳米颗粒是很有前景的潜在吸附剂，在水和废水处理中对金属离子的去除表现出显著的可重复使用性。
Zotero 插件