In Situ Construction of BiO(ClBr)_(1–x)/2I_x–n Solid Solution with Appropriate Surface Iodine Vacancies for Synergistically Boosting Visible-Light Photo-Oxidation Capability

Abstract

A proposed BiO­(ClBr)(1–x)/2I x–n solid solution containing abundant iodine vacancies has been constructed through a facile solvothermal treatment strategy. Fascinatingly, the iodine-vacancy BiO­(ClBr)(1–x)/2I x–n solid solution exhibits an outstanding visible-light photocatalytic degradation property for the environmentally hazardous pollutants of methyl orange, tetracycline, and phenol solutions, which is credited to the synergistic effect of iodine vacancies and the solid solution. By manipulating the molar ratios of Cl, Br, and I, the band structure of the solid solution attained is controlled, enabling the samples to maximize the harvest of visible light and to possess strong oxidation features. More importantly, the construction of iodine vacancies is bound to modulate the local surface atomic structure and promotes the efficiency of the separation of photogenerated carriers. Given these, the microstructure and physicochemical and photoelectrochemical properties of the photocatalysts are fully characterized in a series. In addition, the iodine-vacancy BiO­(ClBr)(1–x)/2I x–n solid solution has a stable crystal structure that permits favorable recyclability even after multiple cycles of degradation. This study sheds light on the significance of the simultaneous existence of vacancy and the solid solution for the enhanced performance of photocatalysts and opens up new insights for sustainable solar–chemical energy conversion.

Magnetron Sputtering Deposition of High Quality Cs3Bi2I9 Perovskite Thin Films

“…It is also noted that there is a small shift of the binding energy toward lower energy of the cesium, bismuth, and iodine peaks. This is probably related to the formation of the perovskite structure, for which the chemical environment of the constituted elements differs from the reactants, according with previously reported value of binding energy [32,33].…”

2D/2D Heterojunction of BiOBr/BiOI Nanosheets for In Situ H2O2 Production and Activation toward Efficient Photocatalytic Wastewater Treatment

“…[ 15 ] The existence of halogen vacancies is further examined by ESR measurements (Figure S28, Supporting Information). [ 31 ] It is also worth mentioning that the defect formation energy ( E def ) for I vacancy is dramatically reduced from −2.3 to −0.16 eV after electron accumulation on BiOI (Figure 5d). In the current system, the electron on BiOI can be supplied either by BiOBr under light irradiation or by the in situ produced H 2 O 2 .…”

BiOCl with a favorable surface state regulated by polyhydroxylated disaccharides for dramatically accelerated photodegradation capacity

“…The modification of layered structure BiOCl is commonly carried out by means of doping, construction of heterojunctions and formation of solid solutions. 11–13 The regulation of BiOCl with polyhydroxylated disaccharide molecules offers a number of benefits. On the one hand, the polyhydroxylated disaccharide molecules possess eight hydroxyl groups.…”