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Searching for a new approach in environmental remediation in terms of dye degradation is important in industrialized society.

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Two novel garnet-type ceramics Ca 3 MZrGe 3 O 12 (M = Co and Zn) with pure phase were prepared through a solid-state reaction method. Structure-property relationships were studied by the Rietveld refinement and Raman spectra. The appearance of two weak symmetric stretching vibrational peaks in Ca 3 ZnZrGe 3 O 12 might be due to the lower ordering. Higher Q × f value in Co-analogue was related to the larger packing fraction and the lower FWHM of A 1g mode. The smaller oxygen bond valence in Ca 3 CoZrGe 3 O 12 indicates a smaller τ f value. At the optimized sintering temperature of 1280 °C, Ca 3 CoZrGe 3 O 12 shows desirable microwave dielectric properties with ε r of 10.37, Q × f value of 60,100 GHz, and τ f value of −28.5 ppm/ o C. The Ca 3 ZnZrGe 3 O 12 ceramic sintered at 1200 °C has the best microwave dielectric properties with ε r of 10.48, Q × f value of 49,700 GHz, and τ f value of −35.8 ppm/ o C.