Biogenic dendritic fibrous Dy2Sn2O7 (Dy2Sn2O7 BDF) were greenly generated in the attendance of Desulfovibrio alaskensis G20 from tin(IV) chloride pentahydrate and Dy(NO3)3·5 H2O as Sn and Dy sources. The anatomical analysis of the specimen verified the generation of Dy2Sn2O7 BDF in the scope of 300 nm. Specimens created with a Desulfovibrio alaskensis G20 was investigated by employing different approaches. The properties of Dy2Sn2O7 BDF as a nanocatalyst were determined by EDS, TGA, TEM, XRD, and SEM. Due to the high ionic internal character, high mechanical and thermal sustainability, and persistent colloidal stability, the system can be deemed as an ideal nanocatalyst by deploying the host-guest method. Carbon dioxide was converted to dimethyl carbonate products. The products were effortlessly separated from the green medium, and Dy2Sn2O7 BDF was reutilized for several runs without a notable drop in catalytic selectivity and activity.