A facile modulating strategy was adopted to fabricate hierarchically porous HP-UOH-X (HP, UOH and X represent the hierarchical pores, UiO-66-(OH)2 and the dosage of benzoic acid, respectively) via introducing benzoic...
The presence of selenium vacancies (V Se ) in metal selenides enables the activation of peroxymonosulfate (PMS) for efficient water purification. However, the mechanisms of interactions of V Se with PMS and organic pollutant removal are unclear. Hence, we precisely prepared a series of FeSe 2 @MoO 3 composites with V Se for effective activation of PMS for the removal of various organic pollutants. The roles of V Se are explored via density functional theory (DFT) calculations: (i) regulating the electron distribution of Fe and Mo orbitals in FeSe 2 @MoO 3 for enhancing the PMS adsorption and (ii) promoting the conversion of transition metallic redox pairs (Fe 3+ /Fe 2+ and Mo 6+ /Mo 5+ / Mo 4+ ). The as-prepared FeSe 2 @MoO 3 -8 exhibits excellent catalytic performance via PMS activation in which nearly 100% removal efficiencies of various organic pollutants are achieved within 2−10 min. The quenching experiments, electronic spin resonance (ESR), and probe tests demonstrated that the multiple reactive species like SO 4•− , O 2 •− , • OH, and 1 O 2 contributed to the removal of 2,4-D. Finally, FeSe 2 @MoO 3 -8 was attached to the polyvinylidene difluoride (PVDF) membrane for continuous and efficient removal of 2,4-D, in which the removal efficiency and total organic carbon removal efficiency of 2,4-D were > 90% and >70% within 12 h of operation.
In the field of corrosion fatigue crack research, how to couple corrosion and fatigue under various conditions is a problem worthy of discussion. According to the electrochemical corrosion principles and the superposition principles, studies have been made on the interaction between corrosion and fatigue, and the relationship model between the corrosion fatigue crack size and the corrosion fatigue remaining life in the Corrosion of Hydrogen evolution (COHE) fatigue long crack growth stage is established. The feasibility of the model is verified by using the experimental data. According to the specific structure of the dislocation butt weld of large storage tank, the stress at the crack is calculated. Based on the above model and the experimental data, the corrosion fatigue residual life of large storage tank is predicted. The feasibility of the model is verified, which provides a new method for corrosion fatigue life prediction of large storage tanks.
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