This study assessed lignocellulosic rice straw fibres as a potential biosorbent for removing textile dyes from industrial effluents. Fibre extraction was performed via hydrothermal pre-treatment and pulping using dilute NaOH. The adsorption capacity of the biosorbent was tested on carcinogenic dyes, including malachite green (MG), methylene blue (MB), basic fuchsin (BF), and Congo red (CR). Characterization techniques included gravimetric composition analysis, Fourier-Transform Infrared (FTIR) Spectroscopy, High-Resolution X-ray diffraction (HR-XRD), Field Emission Scanning Electron Microscopy with Energy Dispersive X-Ray Spectroscopy (FESEM-EDS), Brunauer-Emmett-Teller (BET) analysis and determination of the point of zero charge (p