فهرست نشریات علمی دسترسی آزاد ایران

Various cadmium selenide– and cadmium sulfide–based biochar nanocomposites were successfully synthesized and structurally characterized using field-emission scanning electron microscopy (FESEM) and X-ray diffraction (XRD). The results confirmed the formation of well-defined nanostructures, with CdSe/biochar exhibiting the smallest crystallite size (<15 nm). Fourier-transform infrared spectroscopy (FTIR) further verified the presence of surface hydroxyl and carboxyl functional groups, indicating that the biochar matrix provides an appropriate platform for anchoring nanoparticles and enhancing organic pollutant removal. UV–Vis spectrophotometric analysis revealed that CdSe/biochar achieved up to 98.3% photodegradation of methylene blue (MB). Response Surface Methodology (RSM), based on a Box–Behnken design, was applied to optimize key operational parameters influencing MB removal. Critical factors including temperature, adsorption time, pH, and adsorbent dosage were evaluated for both CdSe/biochar and CdS/biochar systems. Nitrogen adsorption–desorption isotherms (BET) were used to determine pore characteristics and surface areas, confirming the superior textural properties of CdSe/biochar. Isotherm analyses demonstrated that all adsorbents followed the Langmuir adsorption model, indicating monolayer adsorption behavior.