Ion-Induced Synthesis of Alginate Fibroid Hydrogel for Heavy Metal Ions Removal

Ion-Induced Synthesis of Alginate Fibroid Hydrogel for Heavy Metal Ions Removal
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离子诱导合成藻酸盐肌瘤水凝胶用于去除重金属离子

DOI:
10.3389/fchem.2019.00905
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发表时间:
2020-01
影响因子:
5.5
通讯作者:
Yang Zhimao
Yang Zhimao
中科院分区:
化学3区
文献类型:
--
作者:
Kong Chuncai;Zhao Xueqi;Li Yingju;Yang Sen;Chen Yong Mei;Yang Zhimao

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迫切需要设计和合成具有高吸附能力的环保吸附剂来控制水资源污染。在这项工作中,采用钙离子诱导方法合成海藻酸钠肌瘤水凝胶(AFH)。所制备的AFH具有一定的机械强度,尤其是吸附重金属离子后机械强度增强,非常方便回收。 AFH对Cu2+、Cd2+和Pb2+离子表现出优异的吸附性能,并在优化的pH值(3.0-4.0)和温度(303 K)下表现出非常高的饱和吸附容量(Qe),分别为315.92 mg·g−1(Cu2+)、232.35 mg·g−1(Cd2+)和465.22 mg·g−1(Pb2+)。等温线和动力学研究表明,重金属离子的吸附过程符合准二级动力学模型和Langmuir模型。研究发现,三种重金属离子中Pb2+的竞争力最强。因此,AFH在废水重金属离子去除领域具有巨大的应用前景。
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 Cu2+, Cd2+, and Pb2+ ions and displayed very high saturated adsorption capacities (Qe) of 315.92 mg·g−1 (Cu2+), 232.35 mg·g−1 (Cd2+), and 465.22 mg·g−1 (Pb2+) 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. Pb2+ 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.
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