Metal-organic gels (MOGs) are coordination hydrogels formed by the self-assembly of metal ions and organic ligands; their mechanical robustness and chemical stability make them attractive for adsorption, catalysis and molecular separation. In this study, an Fe/Al-based MOG (MOG-Fe/Al) was synthesised and assessed as a flocculant for pulp-mill cypress wastewater. Under the optimised conditions of 1.0 g/L dosage, 100-fold diluted wastewater, pH=9, 30 °C and 12 h contact time, the material achieved 98.3% turbidity removal. SEM, FT-IR, XPS, XRD, TG and BET analyses revealed a porous, irregular morphology with a specific surface area of 360.5 m²/g, classifying the gel as a micro/mesoporous adsorbent. The large surface area and hierarchical pore structure account for the excellent flocculation performance, underscoring the potential of MOG-Fe/Al for practical application in pulp-mill wastewater treatment.