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In recent times, due to their diverse applications, novel bioengineered green magnetic nanomaterials have attracted much interest. In this report, we demonstrated the fabrication and stepwise synthesis of pomegranate peel extract (PPE) modified GO-CuFe 2 O 4 nanocomposite as an advanced functional nanocomposite (PPE@GO-CuFe 2 O 4). We aimed to utilize the phenolic acid phytochemicals in the catalytic process. The novel material was physicochemically characterized using several techniques. The as-developed nanocomposite was explored catalytically in the green synthesis of biodiesel from rapeseed oil by transesterification method. Subsequently, the catalyst was used in the simultaneous determination of toxic organic azo dye food colorants Sudan 1 and 2 in environmental waters using liquid chromatography, and exhibited excellent activity. Being magnetic cored, the nanocatalyst was easily retrieved magnetically and was recycled several times with little change in catalytic activity. • The novel, green nanocomposite was prepared and characterized by a range of advanced techniques. • The material was explored as catalyst in the production of biodiesel and environmental remediation. • The material was recovered easily and reused several times without significant loss of catalytic activity. [ABSTRACT FROM AUTHOR]