Er3+/Yb3+/Sr2+-doped L-Ta2O5 upconversion phosphors were synthesized using the molten salt method with B2O3 as the solvent. High-resolution transmission electron microscopy (HRTEM) results showed that Er3+/Yb3+/Sr2+ underwent intercalated intergrowth in L-Ta2O5. This structure facilitates energy transfer from Yb3+ to Er3+, resulting in outstanding pure green upconversion luminescence (UCL) intensity. The green UCL integrated intensity of L-Ta2O5:Er3+/Yb3+/Sr2+ was 1.53 and 3.14 times greater than that of β-NaYF4:Er3+/Yb3+ and the optimal NaY(WO4)2:Er3+/Yb3+ samples, respectively. The absolute and relative temperature sensitivity reached 1.383% and 0.992% K−1, respectively. The shift rate of the peak centroids reached 0.273 nm GPa−1 under high pressure. With its excellent performance, L-Ta2O5:Er3+/Yb3+/Sr2+ can be used in the fields of UCL display, temperature and pressure sensing.
OH radicals produced via an eco-friendly O 3 decomposition reaction in water are employed in a wide range of applications. In this work, three-dimensional (3D) β-PbO 2 /Ta 2 O 5 and Pt/Ta 3 N 5 samples with a rod-like morphology were successfully fabricated and coupled to carry out electrochemical ozone production (EOP) and hydrogen evolution reaction (HER), respectively. Moreover, the results on the in-situ electrodegradation of dimethoate also indicate that the β-PbO 2 /Ta 2 O 5 NRs show a great potential to be used in advanced oxidation processes (AOPs) applications. Experimental results and theoretical calculations reveal that the excellent EOP performance of the β-PbO 2 /Ta 2 O 5 NRs can be attributed to the adsorption energy of the O species, which can be modulated via the synergic effect between β-PbO 2 and Ta 2 O 5 . This work provides a reference for the development of stable electrocatalysts with high efficiency for the simultaneous production of O 3 and H 2 in environmental applications and energy conversion.
Anlin Xu,Weiqing Han,Jiansheng Li,Xiuyun Sun,Jinyou Shen,Lianjun Wang
A novel dual tubular membrane electrodes reactor was fabricated to degrade a refractory heterocyclic compound-tricyclazole using a tubular membrane Ti/IrO 2 –Ta 2 O 5 as anode and a carbon black-polytetrafluoroethylene (CB-PTFE) modified graphite membrane as cathode. Field emission scanning electron microscopy (FE-SEM), cyclic voltammetry (CV), Linear Sweep Voltammetry (LSV) and accelerated lifetime tests revealed that a porous tubular membrane Ti/IrO 2 –Ta 2 O 5 performed better electrocatalytic activity and high stability under acidic conditions. Meanwhile, the effects of aeration on electrogeneration of hydrogen peroxide (H 2 O 2 ) were assessed and the role of anode in dynamic system was elucidated by comparing with the static system. The influence of the operative parameters such as current density (2.5–12.5 A/m 2 ), membrane flux (52–178 L/m 2 ·h) and pH (3–11) were optimized and monitored. It is demonstrated that tubular membrane Ti/IrO 2 –Ta 2 O 5 anode provided enough oxygen to electrogenerate H 2 O 2 , up to 1586 mg/m 2 ·h, at 10 A/m 2 without aeration in acidic solution. Even if no circulation of the influent, the best removal rate of contaminants reached a stable value 79% at 20 min, which was 6.58-fold greater than the sum of the individual electrochemical oxidation. Synergism was observed during the dual tubular membrane E-Fenton system.
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