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高选择性离子交换材料和直接间隙二维半导体的设计

Ruiqi Wang¹, Haijie Chen², Yi Xiao¹

¹Beijing National Laboratory for Molecular Sciences and State Key Laboratory of Rare Earth Materials Chemistry and Applications, College of Chemistry and Molecular Engineering , Peking University , Beijing 100871 , P. R. China.

Journal of the American Chemical Society

|October 1, 2019

概括

我们开发了一种新型的硫化物,K[Bi4-xMnxS6],用于有效地从废水中去除重金属. 这种材料还可以作为二维半导体,对光电子和环境修复有希望.

科学领域:

材料科学
环境科学
固态化学

背景情况:

分层硫化物对重金属和放射性核酸离子结合有效.
污水处理和水净化需要有选择性和高效的吸附材料.

研究的目的:

设计和合成一种新的分层硫化物,K[Bi4-xMnxS6] (x = 1.28),具有作为吸附剂和半导体的双重功能.
研究合成材料的离子交换特性和半导体特性.

主要方法:

基于Bi2Se3结构的K[Bi4-xMnxS6]的合理设计和合成.
使用光学吸附光谱和DFT电子结构计算进行表征.
用各种金属离子 (Rb+, Cs+, Sr2+, Pb2+, Cd2+, Cr3+, Zn2+) 进行离子交换实验.

主要成果:

K[Bi4-xMnxS6] (x = 1.28) 的直接带间隙为1.40 eV,工作函数为5.26 eV.
该材料具有很高的选择性和捕获Cd2+和Pb2+离子的能力 (Kd高达10^7毫升/克,容量为221.2和342.4毫克/克).
有效的离子交换发生在K+和Mn2+位点,允许创建具有可调节电子结构的新M[Bi4-xMnxS6]材料.

结论:

由于其高效的重金属捕获能力,K[Bi4-xMnxS6] (x=1.28) 是工业和核废水处理的有希望的材料.
该材料作为吸附剂和磁性二维半导体的双重功能为光电子应用开辟了道路.
离子交换机的多功能性允许开发适合特定环境修复和电子应用的材料.

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