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JOURNAL OF SYNTHETIC CRYSTALS ›› 2024, Vol. 53 ›› Issue (9): 1591-1598.

• Research Articles • Previous Articles     Next Articles

Synthesis, Crystal Structure and Photocatalytic Properties of Nanosized La3+-Substituted Arsenotungstate Cluster

YANG Ling1,2,3, SU Binbin1,2,3, WANG Hongsheng1,2,3, LI Jinzhao1,2,3, LI Yesheng1,2,3, CHEN Rui1,2,3   

  1. 1. Key Laboratory of Micro-Nano Materials for Energy Storage and Conversion of Henan Province, Henan 461000, China;
    2. Institute of Surface Micro and Nano Materials, Xuchang University, Henan 461000, China;
    3. College of Chemical and Materials Engineering, Xuchang University, Henan 461000, China
  • Received:2024-04-18 Online:2024-09-15 Published:2024-09-19

Abstract: Based on the principle of molecular design and self-assembly, a novel rare earth based arsenotungstate was obtained by introducing rare earth La ions into the lacunary polyoxotungstates clusters with vacancy structure by one-pot method with Na2WO4·2H2O, NaAsO2 and LaCl3·6H2O as the main materials. The structure and composition of this complex was confirmed by single-crystal X-ray diffraction, X-ray powder diffraction (PXRD), infrared spectroscopy (IR) and so on. The single crystal X-ray diffraction results show that the complex is in the monoclinic system, C2/c space group, and with the cell parameters of a=3.595 56(14) nm, b=1.222 48(4) nm, c=2.247 34(9) nm, β = 117.117 0(10)°, V=8.792 3(6) nm3, Z=4. The molecular formula of this compound is [(CH3)2NH2]8H3.56[{LaO(H2O)2}{WO(H2O)}{W0.24(H2O)2}{AsW9O33}2]. And the polyoxoanion [{LaO(H2O)2}{WO(H2O)}{W0.24(H2O)2}{AsW9O33}2]11.56- shows a novel sandwich type structure, which can be simply described as two trilacunary Keggin type{AsW9O33} units are linked by a {LaO(H2O)2} segment, a {WO(H2O)} segment and a {W0.24(H2O)2} segment. Catalytic degradation property of this compound for Rhodamine-B was further inverstigated. The results demonstrate that the compound shows good photocatalytic activity under the condition of 300 W Hg lamp irradiation, and the degradation efficiency reaches to 74%.

Key words: polyoxometalate, arsenotungstate, one-pot method, lanthanum complex, crystal structure, organic dye, photocatalytic degradation

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