State Key Laboratory of Tea Plant Biology and Utilization, School of Tea and Food Science and Technology, Anhui Agricultural University, Hefei 230036, PR China.
School of Energy, Materials and Chemical Engineering, Hefei University, 99 Jinxiu Avenue, Hefei 230601, PR China.
Int J Biol Macromol. 2023 Jul 15;243:125155. doi: 10.1016/j.ijbiomac.2023.125155. Epub 2023 Jun 1.
A novel and easily separable adsorbent in the shape of a membrane for the rapid removal of fluoride from water was prepared after testing Zr, La and LaZr to modify a chitosan/polyvinyl alcohol composite adsorbent (CS/PVA-Zr, CS/PVA-La, CS/PVA-LA-Zr). The CS/PVA-La-Zr composite adsorbent can remove a large amount of fluoride within 1 min of contact time, and the adsorption equilibrium can be reached within 15 min. The fluoride adsorption behavior of the CS/PVA-La-Zr composite can be described by pseudo-second-order kinetics and Langmuir isotherms models. The morphology and structure of the adsorbents were characterized by scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS) and X-ray diffraction (XRD). The adsorption mechanism was studied using Fourier transform infrared spectroscopy (FTIR) and X-ray photoelectron spectroscopy (XPS), and which showed that ion exchange occurred mainly with hydroxide and fluoride ions. This study showed that an easily operable, low-cost and environmentally friendly CS/PVA-La-Zr has the potential to remove fluoride effectively from drinking water in a short time.
制备了一种新型的、易于分离的膜状吸附剂,用于快速去除水中的氟。该吸附剂是在测试了 Zr、La 和 LaZr 对壳聚糖/聚乙烯醇复合吸附剂(CS/PVA-Zr、CS/PVA-La、CS/PVA-LA-Zr)进行改性后得到的。CS/PVA-La-Zr 复合吸附剂在接触时间 1 分钟内即可去除大量氟,在 15 分钟内即可达到吸附平衡。CS/PVA-La-Zr 复合吸附剂的氟吸附行为可以用拟二级动力学和 Langmuir 等温线模型来描述。采用扫描电子显微镜(SEM)、能谱仪(EDS)和 X 射线衍射(XRD)对吸附剂的形貌和结构进行了表征。通过傅里叶变换红外光谱(FTIR)和 X 射线光电子能谱(XPS)研究了吸附机理,结果表明主要通过氢氧化物和氟化物离子进行离子交换。本研究表明,CS/PVA-La-Zr 具有操作简单、成本低、环保等优点,有望在短时间内有效去除饮用水中的氟。