Uppal Shivani, Arora Arushi, Gautam Sanjeev, Singh Suman, Choudhary R J, Mehta S K
Department of Chemistry, Centre of Advanced Studies in Chemistry, Panjab University Chandigarh 160014 India
Dr S. S. Bhatnagar University Institute of Chemical Engineering and Technology (SSB UICET), Panjab University Chandigarh 160014 India.
RSC Adv. 2019 Jul 26;9(40):23129-23141. doi: 10.1039/c9ra03252e. eCollection 2019 Jul 23.
Considering the significant impact of magnetically retrievable nanostructures, herein, FeO and Ce-doped FeO nanoparticles were employed as scaffolds for the removal of the Reactive Black 5 (RB5) azo dye. We synthesized the Ce-doped FeO nanoparticles hydrothermal treatment at 120 °C for 10 h with varying cerium concentrations (1.5-3.5%) and characterized them using basic techniques such as FTIR and UV-visible spectroscopy, and XRD analysis. The retention of their magnetic behaviors even after cerium amalgamation was demonstrated and confirmed by the VSM results. FESEM and EDX were used for the morphological and purity analysis of the synthesized nanoabsorbents. XPS was carried out to determine the electronic configuration of the synthesized samples. The porosity of the magnetic nanoparticles was investigated by BET analysis, and subsequently, the most porous sample was further used in the adsorption studies for the cleanup of RB5 from wastewater. The dye adsorption studies were probed UV-visible spectroscopy, which indicated the removal efficiency of 87%. The prepared Ce-doped FeO nanoabsorbent showed the high adsorption capacity of 84.58 mg g towards RB5 in 40 min. This is attributed to the electrostatic interactions between the nanoabsorbent and the dye molecules and high porosity of the prepared sample. The adsorption mechanism was also analyzed. The kinetic data well-fitted the pseudo-first-order model, and the adsorption capability at different equilibrium concentrations of the dye solution indicated monolayer formation and chemisorption phenomena. Furthermore, the magnetic absorbent could be rapidly separated from the wastewater using an external magnetic field after adsorption.
考虑到磁性可回收纳米结构的重大影响，本文采用FeO和Ce掺杂的FeO纳米颗粒作为去除活性黑5（RB5）偶氮染料的支架。我们在120℃下通过水热处理10小时，合成了不同铈浓度（1.5 - 3.5%）的Ce掺杂FeO纳米颗粒，并使用傅里叶变换红外光谱（FTIR）、紫外可见光谱和X射线衍射（XRD）分析等基本技术对其进行了表征。振动样品磁强计（VSM）结果证实了即使在铈合并后它们仍保留磁性。场发射扫描电子显微镜（FESEM）和能谱仪（EDX）用于对合成的纳米吸附剂进行形态和纯度分析。进行X射线光电子能谱（XPS）以确定合成样品的电子构型。通过BET分析研究了磁性纳米颗粒的孔隙率，随后，将孔隙率最高的样品进一步用于从废水中清除RB5的吸附研究。通过紫外可见光谱对染料吸附研究进行了探测，结果表明去除效率为87%。制备的Ce掺杂FeO纳米吸附剂在40分钟内对RB5表现出84.58 mg/g的高吸附容量。这归因于纳米吸附剂与染料分子之间的静电相互作用以及制备样品的高孔隙率。还分析了吸附机制。动力学数据很好地拟合了伪一级模型，染料溶液在不同平衡浓度下的吸附能力表明形成了单层且存在化学吸附现象。此外，吸附后使用外部磁场可将磁性吸附剂迅速从废水中分离出来。
