Department of Chemistry, National Institute of Technology, Raipur, CG, India E-mail:
Department of Chemical Engineering, National Institute of Technology, Raipur, CG, India.
Water Sci Technol. 2022 Aug;86(4):625-642. doi: 10.2166/wst.2022.225.
A green method has been developed using Gilloy (Tinospora Cordifolia) shoot extract to synthesize magnetic nanoparticles (MNPs). A further modification of MNPs was performed using anionic surfactant sodium dodecyl sulphate (SDS), to remove cationic dye methyl violet (MV) efficiently from the solution. As an adsorbent, SDS modified MNPs (SDS-MNPs) were tested for their ability to remove MV dye. Synthesized MNPs were characterized by ultra violet-visible spectroscopy (UV-VIS), X-ray diffraction spectroscopy (XRD), Fourier transform infrared spectroscopy (FT-IR), and scanning electron microscopy (SEM). In batch adsorption experiments, the effect of adsorbent dosage, initial dye concentration, time, and pH was evaluated. The maximum adsorption capacity of the adsorbent for MV dye was found to be 174.2 mg g. The adsorption of dye onto the adsorbent followed Langmuir's isotherm. It was shown that the adsorption kinetics of dyes obeyed pseudo-second-order kinetics. Using thermodynamic parameters, spontaneous and exothermic adsorption was determined. As synthesized nanoparticles are magnetic in nature, regeneration and reusability of MNPs were investigated.
一种使用 Gilloy（Tinospora cordifolia）茎提取物合成磁性纳米粒子（MNPs）的绿色方法已经开发出来。进一步使用阴离子表面活性剂十二烷基硫酸钠（SDS）对 MNPs 进行修饰，以有效地从溶液中去除阳离子染料甲基紫（MV）。作为吸附剂，测试了 SDS 修饰的 MNPs（SDS-MNPs）去除 MV 染料的能力。通过紫外-可见光谱（UV-VIS）、X 射线衍射光谱（XRD）、傅里叶变换红外光谱（FT-IR）和扫描电子显微镜（SEM）对合成的 MNPs 进行了表征。在批量吸附实验中，评估了吸附剂用量、初始染料浓度、时间和 pH 值的影响。吸附剂对 MV 染料的最大吸附容量为 174.2mg/g。染料在吸附剂上的吸附遵循朗缪尔等温线。结果表明，染料的吸附动力学符合准二级动力学。利用热力学参数，确定了吸附是自发和放热的。合成的纳米粒子具有磁性，因此研究了 MNPs 的再生和重复使用。
