Lamdab Umaporn, Wetchakun Khatcharin, Kangwansupamonkon Wiyong, Wetchakun Natda
Department of Physics and Materials Science, Faculty of Science, Chiang Mai University Chiang Mai 50200 Thailand
Program of Physics, Faculty of Science, Ubon Ratchathani Rajabhat University Ubon Ratchathani 34000 Thailand.
RSC Adv. 2018 Feb 12;8(12):6709-6718. doi: 10.1039/c7ra13570j. eCollection 2018 Feb 6.
We investigated the effect of a pH-controlled co-precipitation process on the adsorption behavior of manganese ferrite (MnFeO) nanoparticles as well as their structural and magnetic properties. The pH of prepared MnFeO nanoparticles is typically an important factor affecting the adsorption capacity of an adsorbent. In this study, MnFeO nanoparticles were prepared using a co-precipitation method at four different pH values of 9.0, 9.5, 10.0, and 10.5. The adsorption behaviors on rhodamine B (RhB) by MnFeO nanoparticles prepared at different pH values were investigated. It was found that, a pH-controlled process, MnFeO nanoparticles prepared at pH 10.5 showed the highest RhB removal efficiency. The results indicated that the large pore size and surface charge of MnFeO nanoparticles improved the adsorption capacities for RhB. Kinetic data were fitted to a pseudo-second order kinetic model and revealed that equilibrium was reached within 60 min. The isotherm data showed that the Langmuir maximum adsorption capacity of the MnFeO nanoparticles prepared at pH 10.5 for RhB was 9.30 mg g.
我们研究了pH值控制的共沉淀过程对锰铁氧体（MnFeO）纳米颗粒吸附行为及其结构和磁性的影响。制备的MnFeO纳米颗粒的pH值通常是影响吸附剂吸附容量的重要因素。在本研究中，采用共沉淀法在9.0、9.5、10.0和10.5这四个不同的pH值下制备了MnFeO纳米颗粒。研究了在不同pH值下制备的MnFeO纳米颗粒对罗丹明B（RhB）的吸附行为。结果发现，在pH值控制过程中，在pH 10.5下制备的MnFeO纳米颗粒对RhB的去除效率最高。结果表明，MnFeO纳米颗粒的大孔径和表面电荷提高了对RhB的吸附容量。动力学数据拟合为伪二级动力学模型，结果表明在60分钟内达到平衡。等温线数据表明，在pH 10.5下制备的MnFeO纳米颗粒对RhB的朗缪尔最大吸附容量为9.30 mg/g。
