State Key Laboratory of Applied Organic Chemistry, College of Chemistry and Chemical Engineering, Lanzhou University, Lanzhou 730000, China.
State Key Laboratory of Applied Organic Chemistry, College of Chemistry and Chemical Engineering, Lanzhou University, Lanzhou 730000, China.
Int J Biol Macromol. 2021 Jul 1;182:1138-1149. doi: 10.1016/j.ijbiomac.2021.04.132. Epub 2021 Apr 23.
Attapulgite (ATP) has a unique porous layered chain structure and is an excellent environment-friendly decolorizer. However, its high viscosity makes it difficult to separate. First, it was combined with magnetic FeO nanoparticles to obtain FeO-ATP that is easy to recycle and reuse. Then, FeO-ATP nanoparticles were embedded in chitosan (CS) gel beads, and glutaraldehyde was used for cross-linking and curing. Lastly, ethylenediaminetetraacetic acid (EDTA) was successfully connected to FeO-ATP/CS gel beads through amidation reaction, which further increased the capability of the adsorbent to adsorb heavy metal ions. The prepared magnetic composite adsorbent is a sphere with a rough surface and porous structure. The maximum adsorption capacity of the prepared FeO-ATP/EDTA/CS adsorbent for Pb(II), Cu(II), and Ni(II) is 368.32, 267.94, and 220.31 mg g, respectively. After 5 times of repeated use, FeO-ATP/EDTA/CS still showed good adsorption capacity for Cu(II), Pb(II), and Ni(II). FeO-ATP/EDTA/CS has a large adsorption capacity for heavy metal ions, a wide pH applicability, good reuse, and rapid magnetic separation. In addition, Cu(II) loaded FeO-ATP/EDTA/CS also showed good catalytic degradation performance for bisphenol A. This study prepared a new type of adsorbent with good adsorption performance and provided a promising method for the treatment of wastewater.
凹凸棒石（ATP）具有独特的多孔层链状结构，是一种优良的环保型脱色剂。但其高粘度使其难以分离。首先，它与磁性 FeO 纳米粒子结合，得到易于回收和再利用的 FeO-ATP。然后，将 FeO-ATP 纳米粒子嵌入壳聚糖（CS）凝胶珠中，并用戊二醛进行交联和固化。最后，通过酰胺化反应成功地将乙二胺四乙酸（EDTA）连接到 FeO-ATP/CS 凝胶珠上，这进一步提高了吸附剂吸附重金属离子的能力。所制备的磁性复合吸附剂呈粗糙表面和多孔结构的球体。所制备的 FeO-ATP/EDTA/CS 吸附剂对 Pb(II)、Cu(II)和 Ni(II)的最大吸附容量分别为 368.32、267.94 和 220.31mg/g。重复使用 5 次后，FeO-ATP/EDTA/CS 对 Cu(II)、Pb(II)和 Ni(II)仍表现出良好的吸附能力。FeO-ATP/EDTA/CS 对重金属离子具有较大的吸附容量、较宽的 pH 适用性、良好的可重复使用性和快速的磁分离性能。此外，负载 Cu(II)的 FeO-ATP/EDTA/CS 对双酚 A 也表现出良好的催化降解性能。本研究制备了一种具有良好吸附性能的新型吸附剂，为废水处理提供了一种有前景的方法。
