Efficient organic impurities absorption with graphite-rich activated carbon for ultra-pure H2O2 purification

Organic impurities in high-pure H₂O₂ seriously affect the quality of electronic devices. Herein, graphite-rich activated carbon (GAC-X) adsorbents are prepared by high temperature steam method for ultra-pure H₂O₂ purification. Enrichment of graphitic phase in GAC-700, which has been confirmed by various measurement, is favorable for decreasing the Gibbs free energy and increasing the absorption capacity. GAC-700 exhibits excellent organic impurities absorption efficiencies of almost 100% in 27.25% H₂O₂ and 83.04% in 38.84% H₂O₂. The total organic carbon contents in 27.25% H₂O₂ are trace and 49.38 mg·L^-1 for 38.84% H₂O₂ after purification. Moreover, GAC-700 possesses excellent recycled performance and chemical stability. Theoretical calculations reveal that enriched graphite in GAC-700 reduces the adsorption energies of C9 and C10 aromatics. This work provides new insights into the design of activated carbon absorbent for H₂O₂ purification.