Magnetically Responsive Janus Nanoparticles with Catalytic Properties for the Treatment of Methyl Orange Wastewater

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This article presents the design, synthesis and application of novel C8/PW₁₂O₄₀³⁻–IL Janus nanopaticles for highly efficient, recyclable catalytic degradation of methyl orange (MO) in wastewater. The catalyst's innovative asymmetric architecture comprises a hydrophobic C8 hemisphere that selectively adsorbs and pre-concentrates MO molecules, and a catalytic phosphotungstate-ionic liquid hemisphere that activates oxidants to generate hydroxyl radicals for rapid dye degradation. A magnetic Fe₃O₄ core facilitates instantaneous catalyst recovery. This "collect, degrade, and separate" mechanism synergistically results in exceptional performance, surpassing that of many conventional homogeneous and heterogeneous systems, as validated through comparative analysis. This work establishes a strategic paradigm for designing smart, multifunctional materials that combine targeted interfacial engineering with practical recyclability for advanced environmental remediation.

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