Enhanced Photocatalytic Degradation of Organic Colorants by Green Biosynthesized Sunlight‐Active Sugarcane Bagasse Biochar Loaded With SnS ₂ Nanocomposite

The persistent nature and toxicity of synthetic dyes pose a serious environmental challenge in treating wastewater. Herein, a sustainable, bio‐assisted approach was employed to synthesize BC@SnS 2 nanocomposite by anchoring tin disulfide nanoparticles onto sugarcane bagasse‐derived biochar (BC), utilizing Azadirachta indica leaf extract as a biogenic stabilizer and reducing agent. Nanocomposite was characterized by relevant techniques confirming the successful integration of SnS 2 nanoparticles within the porous BC framework. BC@ SnS 2 exhibited a reduced band gap of 2.03 eV, a larger‐surface‐area, and superior visible‐light adsorption and photocatalytic efficiency. Under optimized conditions (20 mg catalyst, pH 5, pollutant concentration: 3 mg L −1 for Malachite Green (MG) and 2 mg L −1 for Rhodamine B (RhB), the composite achieved 94.6% and 93.1% degradation of MG and RhB, respectively, within 120 min under natural sunlight. Langmuir isotherms indicated monolayer adsorption, and first‐order‐kinetics governed the degradation pathway. Scavenger analysis confirmed hydroxyl radicals as the dominant reactive species. LC‐MS analysis validated complete mineralization of dyes, without any harmful byproducts. Nanocomposite retained significant (> 85%) photocatalytic activity over six cycles, confirming its structural stability and reusability. This sustainable and low‐cost BC@ SnS 2 composite offers a promising solution for solar‐driven wastewater remediation.