AbstactThe effect of V 2 O 5 addition on molybdates crystallization tendency, glass structure and chemical durability of aluminoborosilicate glass belonging to SiO 2 -B 2 O 3 -CaO-Na 2 O-Al 2 O 3 -MoO 3 system has been studied. The results confirm that V 2 O 5 addition can effectively suppress the crystallization tendency of powellite and enhance the molybdenum solubility in the glass. The MoO 3 solubility limit is found to be 2.8 mol% in the V 2 O 5 -containing aluminoborosilicate glass. Raman results reveal that V 2 O 5 addition seems to modify the local structural environment of isolated MoO 4 units and increase their chemical disorder in the glass, which is favored for molybdenum incorporation in the glass. The molar volume and glass transition temperature of samples are found to depend on V 2 O 5 content. Product consistency test (PCT) results show that the normalized leaching rates of the V 2 O 5 -containing aluminoborosilicate glass maintain at a fairly low level compared with standard borosilicate glassy waste form.

Heterostructure construction and doping provide two powerful routes for manipulating charge carrier separation, electrical transport, optical response, and interface kinetics for photocatalysis. However, the literature reported synthetic methods until now were very time-consuming. In this work, a facile one-pot hydrothermal reaction route was designed to synthesize Si nanospheres @ Ti[Formula: see text] self-doped TiO2 nanosheet heterostructure with tunable Ti[Formula: see text] doping levels at different hydrothermal temperatures. It was found that the precursor Si nanospheres not only serve as supporter of TiO2 nanosheets, but also are the inducement of Ti[Formula: see text] doping. Due to the synergistic effect of Ti[Formula: see text] doping and Si/TiO2 heterojunctions, the optimal sample exhibited 6.74-fold enhancement for rhodamine B (RhB) photodegradation under Xe lamp irradiation compared with the pristine TiO2. The construction of Si/TiO2 heterojunction, as well as the introduced Ti[Formula: see text] doping and associated oxygen vacancies, extended the optical absorption of TiO2 into visible region and enhanced the separation efficiency of photogenerated electron-hole pairs, which finally resulted in improved photocatalytic performance of the Si@Ti[Formula: see text] self-doped TiO2 core–shell nanospheres. The designed hydrothermal route opens up an opportunity to the synthesis of doped hetero-photocatalysts in an efficient way.