Fig. 4

Decomposition of H₂O₂ (initial concentration 3.34 g L^− 1) by 1 g L^− 1 pristine and preconditioned chrysotile fibers at pH 7.4 (50 mmol L^− 1 MOPS). Parameters of the exponential fits of the H₂O₂ concentration data are presented in Table 2. Panel a.) Decomposition of H₂O₂ in the presence of pristine, blank-altered and DFOB-altered fibers; Panel b.) H₂O₂ decomposition in the presence of MOPS buffer + 1 mmol L^− 1 DFOB, in absence of fibers, and in presence of pristine, blank-altered and DFOB-altered fibers; Panel c-d.) Decomposition of H₂O₂ in absence of fibers and in presence of DFOB-altered fibers + 0, 3, 30 and 300 μmol g^− 1 Fe (Panel c) and blank-altered fibers + 0, 3, 30 and 300 μmol g^− 1 Fe (Panel d). Error bars indicate standard deviations (n = 2)