AbstractThe pyrolysis of waste newspaper (WP) and co-pyrolysis of waste newspaper with high-density polyethylene (HDPE) (1:1 wt%) were carried out in a quartz tube at 500 °C to obtain biochars. The biochars were characterized in detail by X-ray diffraction (XRD), thermogravimetric analysis (TG), Fourier transform infrared spectroscopy (FT-IR), X-ray photoelectron spectroscopy (XPS), elemental analysis, scanning electron microscopy (SEM), automated specific surface area and pore size analyzer, and Raman spectroscopy to determine their physical and chemical properties. The analysis results for WP/HDPE-derived biochar (CWH) were compared to WP-derived biochar (CWB). The CWH had lower oxygen-containing groups, increased aromatic structure, higher calorific value, higher fuel ratio, and greater porosity development. CWH is more appropriate as solid fuel, soil adsorbent, or activated carbon precursor as compared to CWB.