Fig. 2. The absorption spectra of a C NPs (a) or L + HRP (b) and ADMA mixture before and after addition of H₂O₂. The spectra were obtained every 2 min after addition of H₂O₂. Rapidly decreased characteristic absorbance at 260 nm of ADMA within 2 min confirms the efficient ¹O₂ production of C NPs in the presence of H₂O₂. (c) Kinetic curves of the ADMA consumption of L + HRP and C NPs.