Fig. 3
pH-responsive biodegradation behavior of CMC. (a-d) Morphological changes in CMC and Cu2O with extended exposure time at pH 6.0. (e, f) UV-vis absorption spectra of Cu2O and CMC at pH 6.0 after incubation of different times. (g-j) Evaluation of 1O2 generation capability of Cu2O and CMC at pH 6.0 after incubation of different times. (k, l) XRD patterns of Cu2O and CMC after degradation at pH 6.0 for different times. (m-p) The survey XPS and high-resolution Cu 2p spectra of Cu2O and CMC after degradation at pH 6.0 for different times