Praipipat Pornsawai, Ngamsurach Pimploy, Srirat Pratchayaporn, Chaiphumee Punjaporn
Department of Environmental Science, Faculty of Science, Khon Kaen University, Khon Kaen, 40002, Thailand.
Environmental Applications of Recycled and Natural Materials (EARN) Laboratory, Khon Kaen University, Khon Kaen, 40002, Thailand.
Sci Rep. 2024 Mar 8;14(1):5763. doi: 10.1038/s41598-024-56499-z.
The pomelo-doped zinc oxide beads (PZB), pomelo-doped titanium dioxide beads (PTB), and pomelo-doped zinc oxide and titanium dioxide beads (PZTB) were synthesized for sorbing methylene blue (MB) dye. Their characterizations were explored by X-Ray Diffractometer (XRD), Field Emission Scanning Electron Microscopy and Focus Ion Beam (FESEM-FIB), Energy Dispersive X-Ray Spectrometer (EDX), and Fourier Transform Infrared Spectroscopy (FT-IR). In addition, their sorbent efficiencies for sorbing MB dye were investigated through batch experiments, sorbent reusability studies, sorption isotherms, kinetics, and thermodynamic studies. They were crystalline phases presenting the specific peaks of zinc oxide (ZnO) or titanium dioxide (TiO). Their surfaces had lamella structures with coarse surfaces, and they also found specific structures of ZnO or TiO on the surfaces. Zn-O or Ti-O-Ti was also detected in PZB or PTB or, PZTB depending upon metal oxide types added into pomelo beaded sorbents. For batch experiments, they could adsorb MB dye of more than 86%, and PZTB showed the highest MB dye removal efficiency. In addition, they could be reused for more than three cycles with high MB dye sorptions of more than 72%. They corresponded to Freundlich and pseudo-second-order kinetic models. Moreover, the increasing temperature affected their decreasing MB dye sorptions which were exothermic processes.
合成了掺杂柚子的氧化锌珠（PZB）、掺杂柚子的二氧化钛珠（PTB）以及掺杂柚子的氧化锌和二氧化钛珠（PZTB）用于吸附亚甲基蓝（MB）染料。通过X射线衍射仪（XRD）、场发射扫描电子显微镜和聚焦离子束（FESEM-FIB）、能量色散X射线光谱仪（EDX）以及傅里叶变换红外光谱仪（FT-IR）对它们进行了表征。此外，通过批量实验、吸附剂可重复使用性研究、吸附等温线、动力学和热力学研究考察了它们对MB染料的吸附效率。它们为结晶相，呈现出氧化锌（ZnO）或二氧化钛（TiO）的特定峰。它们的表面具有粗糙表面的层状结构，并且在表面上还发现了ZnO或TiO的特定结构。根据添加到柚子珠状吸附剂中的金属氧化物类型，在PZB或PTB或PZTB中也检测到了Zn-O或Ti-O-Ti。对于批量实验，它们对MB染料的吸附率超过86%，且PZTB表现出最高的MB染料去除效率。此外，它们可以重复使用三个以上循环，对MB染料的高吸附率超过72%。它们符合弗伦德利希和伪二级动力学模型。此外，温度升高影响它们对MB染料吸附的降低，这是放热过程。
