Chitosan modified Cu2O nanoparticles with high catalytic activity for p-nitrophenol reduction
2019; Elsevier BV; Volume: 480; Linguagem: Inglês
10.1016/j.apsusc.2019.02.246
ISSN1873-5584
AutoresYan Guo, Mingming Dai, Zhixu Zhu, Yuqi Chen, Hui He, Tianheng Qin,
Tópico(s)Advanced Photocatalysis Techniques
ResumoChitosan modified cuprous oxide (Cu2O-CTS) were prepared via facile chemical reduction method. The morphology and structure of Cu2O-CTS nanoparticles were characterized by transmission electron microscopy, X-ray diffraction, Fourier transform infrared spectroscopy, X-ray photoelectron spectroscopy, and UV–vis diffuse reflectance spectroscopy. The catalytic ability of Cu2O-CTS, both in photocatalysis and electrocatalysis, was carried out on p-nitrophenol reduction. In comparison with the pristine Cu2O, Cu2O-CTS exhibits improved photocatalytic abilities with the reduction rate increased by 1.7 times. The catalytic capacity increases along with the increased proportion of CTS in Cu2O-CTS nanoparticles. Cu2O-CTS modified electrodes shows enhanced electrocatalytic capacities as well, with more positive reduction peak potential and higher peak current. Based on the experimental results, a catalytic mechanism for p-NP reduction over Cu2O-CTS catalysts is proposed. The improvement might come from the reduced band gap energy after the chitosan modification, thus Cu2O-CTS nanoparticles have higher catalytic activity. On the other hand, the more beneficial (111) crystal surface involves in the improvement as well, which endows Cu2O-CTS stronger activity and interaction with p-nitrophenol.
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