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We show that the rough particles studded with platinum nanoparticles can befabricated straightforwardly and in a single step at room temperature. Theserough particles displayed a good catalytic power (100% removal efficiency)against a model industrial dye (methylene blue) and pharmaceutical residue(tetracycline) within a reasonable time scale. Further, we illustrate theeffects of particle size, concentration, and contact patterns on theperformance of rough catalytic particles. The semi-batch conditions favouredthe complete decomposition of tetracycline within 40 min, but the batch-wiseoperation offered a good contacting pattern for methylene blue yielding amaximal output within 10 min. The kinetics of the heterogeneous catalyticprocess modelled by Langmuir-Hinshelwood kinetics predicts that the givenmethylene blue decomposition reaction induced by the rough particles followsthe pseudo-first-order kinetics. The rate constants for the reaction catalyzedby 0.6 and 1.0um-sized rough particles are 0.048 and 0.032 min^-1,respectively. Furthermore, we established the proof-of-concept usingmagnetically-responsive rough particles for real-time applications, includingdecontamination and recovery of catalyst particles via an externally appliedmagnetic field in one cycle. Our proposed method helps achieve a near-100%degrading efficiency within 10 to 40 min at minimal catalytic particleconcentration, i.e., 200 ppm. Since we can turn the rough particles intosuper-paramagnetic, we can recover and reuse them for several wastewatertreatment cycles without incurring any running costs.

Removal of industrial dye and pharmaceutical product using the nano and micron-sized PS rough particles studded with Pt nanoparticles