Nano-sized ZnO supported on poly(triazine imide) nanotube for visible light driven photocatalytic reduction of Cr(VI)
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The poly(triazine imide) (PTI) nanotube/ZnO heterojunction was prepared by two step method. PTI nanotube was synthesized from the condensation of melamine in a salt melt of LiCl–KCl. Then, nano-sized ZnO supported on PTI nanotube was prepared by a chemical precipitation method. The reduction rate of Cr(VI) under visible light irradiation was used to evaluate the activity of photocatalyst. It was found that the PTI/ZnO-1.5 wt% heterojunction exhibits the highest photocatalytic activity, which can reduce almost all Cr(VI) within 120 min. The kinetic constant of reduction reaction with PTI/ZnO-1.5 wt% heterojunction (0.0291 min− 1) is about 6 times as high as that of the PTI (0.00443 min− 1). A possible photocatalytic mechanism was discussed on the basis of the energy-band theory and scavenger experiments. Results show that photo-induced electrons participated in the reduction of Cr(VI) solution over the PTI/ZnO heterojunction. The enhanced photocatalytic activities of heterojunction can be attributed to efficient charge separation and good interfacial contact between PTI and ZnO.
This research was financially supported by the International Project on Scientific and Technological Cooperation in Shaanxi Province of China (No. 2018KW-052), Natural Science Basis Research Plan in Shaanxi Province of China (No. 2018JM5170), the Chang’an University Undergraduates Training Programs of Innovation and Entrepreneurship and the Fundamental Research Funds for the Central Universities of China (No. 300102318402).
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