1：Experimental Design and Method Selection:

A novel and non-toxic biofuel, extract of pineapple, was employed to fabricate Nd2Sn2O7-SnO2 nanocomposites through an environment-friendly procedure. The synthesis involved the use of Nd(NO3)3.6H2O and Tin(IV) chloride pentahydrate as starting materials, with the pineapple extract acting as a capping agent.

2：6H2O and Tin(IV) chloride pentahydrate as starting materials, with the pineapple extract acting as a capping agent. Sample Selection and Data Sources:

2. Sample Selection and Data Sources: The study explored the role of various dosages of pineapple extract and fabrication times on the properties of Nd2Sn2O7-SnO2 structures. Samples were prepared with different amounts of pineapple extract and calcined at 500°C for varying times.

3：List of Experimental Equipment and Materials:

Field emission scanning electron microscope (FESEM, MIRA3 FEG-SEM), diffractometer of Philips Company with Ni-filtered Cu Ka radiation, transmission electron microscopy (JEM-2100 TEM), thermal gravimetric analysis instrument (Shimadzu TGA-50H), automated gas adsorption analyzer (Tristar 3000, Micromeritics), UV–vis spectrophotometer (Shimadzu, UV-2550, Japan).

4：Experimental Procedures and Operational Workflow:

The synthesis involved adding pineapple extract to a solution of Nd and Sn sources, maintaining the temperature at 45°C, drying the resulting gel at 100°C, and calcining at 500°C. The photocatalytic activity was tested by dispersing the nanocomposites in solutions of rhodamine B or eosin Y and measuring the degradation under visible light.

5：Data Analysis Methods:

The photocatalytic degradation rate was calculated based on the absorbance of the contaminants at characteristic wavelengths. The nanocomposites were characterized using XRD, TEM, EDS, DRS, BET, and FESEM.