Degradation of Orange G in water by nano-Cu⁰/H₂O₂ process with nano-Cu⁰ synthesized in a rotating packed bed with blade packings

In this investigation, Orange G in water was degraded by the nano-Cu⁰/H₂O₂ process with nano-sized copper particles (RPB-nano-Cu⁰) that were synthesized by chemical reduction in a rotating packed bed (RPB) with blade packings. The effects of H₂O₂ dosage and RPB-nano-Cu⁰ dose on the degradation of Orange G by the RPB-nano-Cu⁰/H₂O₂ process were investigated. An optimal H₂O₂ dosage in the degradation of Orange G by the RPB-nano-Cu⁰/H₂O₂ process was 5 mmol/L for a RPB-nano-Cu⁰ dose of 0.25 g/L. An optimal RPB-nano-Cu⁰ dose in the degradation of Orange G by the RPB-nano-Cu⁰/H₂O₂ process was 0.25 g/L for an H₂O₂ dosage of 5 mmol/L. The RPB-nano-Cu⁰/H₂O₂ process with 25 °C, pH 3, an H₂O₂ dosage of 5 mmol/L, and a RPB-nano-Cu⁰ dose of 0.25 g/L exhibited an efficiency of degradation of Orange G (10 mg/L) of 93% at 30 min. The efficiency of degradation of Orange G (10 mg/L) using commercial nano-Cu⁰ from Sigma-Aldrich (0.25 g/L) in the presence of H₂O₂ (5 mmol/L) at pH 3 was 73% after 30 min. The RPB-nano-Cu⁰/H₂O₂ process exhibited the great potential in the efficient degradation of Orange G in water.