کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
11263117 | 1781703 | 2019 | 29 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Novel g-C3N4/hâ²ZnTiO3-aâ²TiO2 direct Z-scheme heterojunction with significantly enhanced visible-light photocatalytic activity
دانلود مقاله + سفارش ترجمه
دانلود مقاله ISI انگلیسی
رایگان برای ایرانیان
کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی مواد
فلزات و آلیاژها
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
Novel g-C3N4/hâ²ZnTiO3-aâ²TiO2 (CN/hâ²ZT-aâ²T) ternary composites were successfully prepared by combining in-situ precursor-synthesized hâ²ZnTiO3-aâ²TiO2 (hâ²ZT-aâ²T) nanoparticle with nanoporous g-C3N4 (CN) powders. X-ray diffraction (XRD), Transmission electron microscopy (TEM), and X-ray photoelectron spectroscopy (XPS) results revealed that the grains of hexagonal-phase ZnTiO3 (hâ²ZT) were in-situ generated together with anatase-phase TiO2 (aâ²T), forming a symbiotic structure of tightly bonded interface. Compared with CN and hâ²ZT-aâ²T, the absorption edge of CN/hâ²ZT-aâ²T exhibited a red-shift and the absorption intensity was obviously enhanced. With increasing CN content, the degradation efficiency of CN/hâ²ZT-aâ²T for methylene blue (MB) initially increased and then decreased, reaching the highest value of 99.8% with the CN content of 50â¯wt% (50CN/hâ²ZT-aâ²T). The 50CN/hâ²ZT-aâ²T composites exhibited the highest apparent reaction rate constant of 2.92 hâ1, which was 37.4 and 3.0 times higher than that of hâ²ZT-aâ²T and CN, respectively. Photocurrent response of 50CN/hâ²ZT-aâ²T was indicative of the highest photocurrent value and the elongated lifetime of photogenerated charges. The greatly enhanced photocatalytic activity was attributed to the high mobility of photogenerated electrons. Hâ²ZnTiO3 with high electron mobility in the direct Z-scheme heterojunction played a role of electronic transfer station and reduced the recombination probability of photogenerated carriers.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Alloys and Compounds - Volume 774, 5 February 2019, Pages 768-778
Journal: Journal of Alloys and Compounds - Volume 774, 5 February 2019, Pages 768-778
نویسندگان
Xibao Li, Jie Xiong, Juntong Huang, Zhijun Feng, Junming Luo,