研究目的
To prepare and characterize a series of germanotungstate-based 3d-4f heterometallic compounds and investigate their photocatalytic, electrochemical, and magnetic properties under visible light irradiation.
研究成果
The compounds exhibit excellent photocatalytic activities for dye degradation under visible light, electrocatalytic reduction of H2O2, and varied magnetic behaviors dominated by antiferromagnetic or mixed interactions, highlighting their potential in catalysis and magnetism.
研究不足
The study is limited to specific lanthanides (Sm, Eu, Gd, Tb) and conditions; potential optimizations include exploring other lanthanides or varying synthesis parameters to enhance properties.
1：Experimental Design and Method Selection:
Hydrothermal synthesis was used to prepare the compounds. Structural characterization involved IR, UV-Vis, XRD, and X-ray single-crystal diffraction. Magnetic measurements used a SQUID magnetometer, electrochemistry used a CHI660 workstation, and photocatalysis involved degradation of MB and RhB under visible light with H2O
2：Sample Selection and Data Sources:
Compounds were synthesized using K8[γ-GeW10O36]·6H2O as precursor, with CuCl2·2H2O, Ln(NO3)3·6H2O (Ln = Sm, Eu, Gd, Tb), and 1,2-diaminopropane (dap).
3：List of Experimental Equipment and Materials:
Perkin-Elmer 2400-II CHN analyzer for elemental analysis, Nicolet 170 FT-IR spectrophotometer for IR spectra, Philips X’Pert Pro diffractometer for XRD, Quantum Design MPMS 3 SQUID magnetometer for magnetic measurements, CHI660 electrochemical workstation for electrochemistry, Shimadzu UV-250 spectrophotometer for UV-Vis spectra, Hg lamp (500 W) for photocatalysis.
4：Experimental Procedures and Operational Workflow:
Hydrothermal synthesis at 160°C for 5 days. For photocatalysis, 3 mg catalyst dispersed in dye solution with H2O2, stirred in dark for 30 min, then irradiated with visible light; samples taken at intervals for analysis.
5：Data Analysis Methods:
Structural data refined using SHELXTL-97. Magnetic data analyzed with Curie-Weiss law. Photocatalytic degradation rates calculated from absorbance changes.
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CHN analyzer
2400-II
Perkin-Elmer
Elemental analyses for C, H, and N
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SQUID magnetometer
MPMS 3
Quantum Design
Magnetic measurements
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Electrochemical workstation
CHI660
CH Instruments
Electrochemical performances testing
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UV spectrophotometer
UV-250
Shimadzu
UV-vis absorption spectra
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CCD detector
Apex-II
Bruker
X-ray single crystal diffraction data collection
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FT-IR spectrophotometer
170
Nicolet
Recording IR spectra in KBr pellets
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X-ray diffractometer
X’Pert Pro
Philips
X-ray powder diffraction analyses
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Hg lamp
Visible light irradiation for photocatalysis
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