Kong Chuncai, Zhao Xueqi, Li Yingju, Yang Sen, Chen Yong Mei, Yang Zhimao
School of Science, MOE Key Laboratory for Non-Equilibrium Synthesis and Modulation of Condensed Matter, Xi'an Jiaotong University, Xi'an, China.
College of Bioresources Chemical and Materials Engineering, Shaanxi University of Science & Technology, Key Laboratory of Leather Cleaner Production, China National Light Industry, Xi'an, China.
Front Chem. 2020 Jan 10;7:905. doi: 10.3389/fchem.2019.00905. eCollection 2019.
Design and synthesis of environmentally friendly adsorbents with high adsorption capacities are urgently needed to control pollution of water resources. In this work, a calcium ion-induced approach was used to synthesize sodium alginate fibroid hydrogel (AFH). The as-prepared AFH has certain mechanical strength, and the mechanical strength is enhanced especially after the adsorption of heavy metal ions, which is very convenient for the recovery. AFH exhibited excellent adsorption performances for Cu, Cd, and Pb ions and displayed very high saturated adsorption capacities (Qe) of 315.92 mg·g (Cu), 232.35 mg·g (Cd), and 465.22 mg·g (Pb) with optimized pH values (3.0-4.0) and temperature (303 K). The study of isotherms and kinetics indicated that adsorption processes of heavy metal ions fitted well with the pseudo-second-order kinetics model and the Langmuir model. Pb was found to have the strongest competitiveness among the three heavy metal ions. Thus, AFH has great application prospects in the field of heavy metal ions removing from wastewater.
迫切需要设计和合成具有高吸附容量的环保型吸附剂来控制水资源污染。在这项工作中，采用钙离子诱导法合成了海藻酸钠纤维状水凝胶（AFH）。所制备的AFH具有一定的机械强度，特别是在吸附重金属离子后机械强度增强，这非常便于回收。AFH对Cu、Cd和Pb离子表现出优异的吸附性能，在优化的pH值（3.0 - 4.0）和温度（303 K）下，对Cu、Cd和Pb离子的饱和吸附容量（Qe）分别高达315.92 mg·g、232.35 mg·g和465.22 mg·g。等温线和动力学研究表明，重金属离子的吸附过程与准二级动力学模型和朗缪尔模型拟合良好。研究发现，在三种重金属离子中，Pb的竞争力最强。因此，AFH在从废水中去除重金属离子领域具有广阔的应用前景。
