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Functionalized Magnetic Silica Nanoparticles for Highly Efficient Adsorption of Sm3+ from a Dilute Aqueous Solution
Langmuir ( IF 3.7 ) Pub Date : 2018-02-12 00:00:00 , DOI: 10.1021/acs.langmuir.7b04010 Yue Wang 1 , Hari Katepalli 2 , Tonghan Gu 2 , T. Alan Hatton 2 , Yundong Wang 1
Langmuir ( IF 3.7 ) Pub Date : 2018-02-12 00:00:00 , DOI: 10.1021/acs.langmuir.7b04010 Yue Wang 1 , Hari Katepalli 2 , Tonghan Gu 2 , T. Alan Hatton 2 , Yundong Wang 1
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Separation of Sm3+ from a dilute solution via conventional solvent extraction is often plagued by emulsion and third phase formation. These problems can be overcome with functionalized magnetic nanoparticles that can capture the target species and be separated from the raffinae phase rapidly and efficiently on application of a magnetic field. Magentic silica nanoparticles (Fe2O3/SiO2) were synthesized by a modified Stöber method and functionalized with carboxylate (Fe2O3/SiO2/RCOONa) and phosphonate (Fe2O3/SiO2/R1R2PO3Na) groups to achieve high adsorption capacity and fast adsorption kinetics. The adsorbents were characterized by X-ray diffraction analysis, transmission electron microscopy, BET measurements, magnetization property evaluation, Fourier infrared spectroscopy, and thermogravimetric analysis. Equilibrium adsorption of Sm3+ on Fe2O3/SiO2/RCOONa particles was attained within 10 min and within 20 min on Fe2O3/SiO2/R1R2PO3Na nanoparticles. The kinetic data were correlated well with a pseudo-second-order model. Adsorption capacities of Fe2O3/SiO2/RCOONa and Fe2O3/SiO2/R1R2PO3Na were 228 and 180 mg/g, respectively. The recovery of the adsorbed Sm3+ using 2 mol/L HCl as desorption agent was evaluated. The adsorption mechanism is discussed based on FTIR analysis, carboxylate group/Sm3+ molar ratio, phosphonate group/Sm3+ molar ratio, and pH. The adsorbents show significant potential for Sm3+ recovery in industrial applications.
中文翻译：
功能化的磁性二氧化硅纳米颗粒，可从稀水溶液中高效吸附Sm 3+
通过常规溶剂萃取从稀溶液中分离Sm 3+经常会受到乳液和第三相形成的困扰。这些问题可以通过功能化的磁性纳米颗粒来克服，这些磁性纳米颗粒可以捕获目标物种，并在施加磁场后迅速，有效地与棉子草相分离。通过改良的Stöber方法合成了纳米二氧化硅纳米颗粒（Fe 2 O 3 / SiO 2），并用羧酸盐（Fe 2 O 3 / SiO 2 / RCOONa）和膦酸酯（Fe 2 O 3 / SiO 2 / R 1 R 2 PO）功能化3 Na）基团可实现高吸附容量和快速吸附动力学。通过X射线衍射分析，透射电子显微镜，BET测量，磁化性能评估，傅立叶红外光谱和热重分析对吸附剂进行表征。Fe 2 O 3 / SiO 2 / RCOONa颗粒在10分钟内和20分钟内在Fe 2 O 3 / SiO 2 / R 1 R 2 PO 3 Na纳米颗粒上达到Sm 3+的平衡吸附。动力学数据与伪二级模型很好地相关。Fe 2 O的吸附能力3 / SiO 2 / RCOONa和Fe 2 O 3 / SiO 2 / R 1 R 2 PO 3 Na分别为228和180 mg / g。评估了使用2 mol / L HCl作为脱附剂的吸附Sm 3+的回收率。基于FTIR分析，羧酸根/ Sm 3+摩尔比，膦酸酯基/ Sm 3+摩尔比和pH值对吸附机理进行了讨论。吸附剂在工业应用中显示出Sm 3+回收的巨大潜力。
更新日期：2018-02-12
中文翻译：
功能化的磁性二氧化硅纳米颗粒，可从稀水溶液中高效吸附Sm 3+
通过常规溶剂萃取从稀溶液中分离Sm 3+经常会受到乳液和第三相形成的困扰。这些问题可以通过功能化的磁性纳米颗粒来克服，这些磁性纳米颗粒可以捕获目标物种，并在施加磁场后迅速，有效地与棉子草相分离。通过改良的Stöber方法合成了纳米二氧化硅纳米颗粒（Fe 2 O 3 / SiO 2），并用羧酸盐（Fe 2 O 3 / SiO 2 / RCOONa）和膦酸酯（Fe 2 O 3 / SiO 2 / R 1 R 2 PO）功能化3 Na）基团可实现高吸附容量和快速吸附动力学。通过X射线衍射分析，透射电子显微镜，BET测量，磁化性能评估，傅立叶红外光谱和热重分析对吸附剂进行表征。Fe 2 O 3 / SiO 2 / RCOONa颗粒在10分钟内和20分钟内在Fe 2 O 3 / SiO 2 / R 1 R 2 PO 3 Na纳米颗粒上达到Sm 3+的平衡吸附。动力学数据与伪二级模型很好地相关。Fe 2 O的吸附能力3 / SiO 2 / RCOONa和Fe 2 O 3 / SiO 2 / R 1 R 2 PO 3 Na分别为228和180 mg / g。评估了使用2 mol / L HCl作为脱附剂的吸附Sm 3+的回收率。基于FTIR分析，羧酸根/ Sm 3+摩尔比，膦酸酯基/ Sm 3+摩尔比和pH值对吸附机理进行了讨论。吸附剂在工业应用中显示出Sm 3+回收的巨大潜力。
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