Effects of different exposed-facets on photocatalytic activity of BiOBr/Bi2Ti2O7 heterostructure and mechanism analysis
Li, PJ (Li, Panjie)[ 1 ] ; Jiang, CY (Jiang, Caiyun)[ 2 ] ; Feng, CS (Feng, Changsheng)[ 1 ] ; Wang, YP (Wang, Yuping)[ 1,3 ]*（王玉萍）

[ 1 ] Nanjing Normal Univ, Sch Chem & Mat Sci, Jiangsu Prov Key Lab Mat Cycling & Pollut Control, Nanjing 210046, Peoples R China
[ 2 ] Jiangsu Inst Commerce, Dept Engn & Technol, Nanjing 211168, Peoples R China
[ 3 ] Nanjing Univ Sci & Technol, Jiangsu Key Lab Chem Pollut Control & Resources R, Nanjing 210094, Peoples R China

MATERIALS CHEMISTRY AND PHYSICS,202009,252,123426

In this paper, the novel heterojunctions of Bi2Ti2O7 and BiOBr with different crystal facets ({001} and {010}) were synthesized by in-situ precipitation method under room temperature. The structure and properties of the materials were analyzed. The photodecomposition properties of the materials were studied by using rhodamine B (RhB) and ciprofloxacin (CIP) as targets. The possible mechanism of the difference of facet-engineering on photocatalytic degradation was studied. The XPS results indicated that the high-quality interfacial connection existed in Bi2Ti2O7/BiOBr hetemstructure. It was found that the RhB and CIP degradation rates of Bi2Ti2O7/BiOBr-{010} photocatalyst are 2.05 and 1.82 times higher respectively than that of Bi2Ti2O7/BiOBr-{001} under visible light. This enhancement was mainly attributed that laminate BiOBr dominating {010} exposed-facet with higher the specific area (S-BET) combined with spherical Bi2Ti2O7, which extended S-BET and provided more active site; furthermore, the formation of the type-II band location and strong interfacial interaction vastly weaken the barrier of electron transfer, promoting the quantum efficiency. The synergistic effect of facet-engineering and composite structure were discussed in detail, providing significant reference to design highly active photocatalyst.

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https://www.sciencedirect.com/science/article/pii/S0254058420307938?via%3Dihub

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