Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 11, Issue 39, Pages 35702-35712Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.9b10555
Keywords
polyaniline; phytic acid; hydrochloric acid; codoping; Cr(VI) reduction; photocatalysis
Funding
- Ministry of Science and Technology, Taiwan [MOST 107-2221-E-033-032-MY3, 1082221-E-033-034-MY3]
- JSPS [JP 16K21724, JP 16H06441]
- Chung Yuan Christian University
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In this study, graphitic carbon nitride (g-C3N4) nanosheets (CNns) were modified using polyaniline (PANT) codoped with an inorganic (hydrochloric acid, HCl) and an organic (phytic acid, PA) acid. Our results revealed that these samples exhibited extended visible-light absorption and a three-dimensional (3D) hierarchical structure with a large specific surface area. They also inhibited photoluminescence emission, reduced electrical resistance, and provided abundant free radicals, resulting in high photocatalytic performance. The PANI/g-C3N4 sample demonstrated outstanding photocatalytic activity of a Cr(VI) removal capacity of 4.76 mg.min(-1).g(c)(-1), which is the best record for the reduction of a 100 ppm K2Cr2O7 solution. Moreover, g-C3N4 coupled with PANI monotonically doped with HCl or PA did not demonstrate increased activity, suggesting that the codoping of HCl and PA plays a significant role in enhancing the performance. The improved photocatalytic activity of PANI/g-C3N4 can be attributed to the interchain and intrachain doping of PA and HCl over PANI, respectively, to create a 3D connected network and synergistically increase the electrical conductivity. Therefore, new insights into g-C3N4 coupled with PANI and codoped by HCl and PA may have excellent potential for the design of g-C3N4-based compounds for efficient photocatalytic reactions.
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