Yingnan Yang,Dongxue Wu,Zhen Zhang,Wei Cao,Xiaochong Zhao,Yawei Hao,Pan Yang,Jingchuan Wang
A simple and rapid method, temperature rising and crystallization, has been used to synthesis single crystals of inorganic perovskite CsPbBr x I (3-x) , which have higher stability than organic perovskite materials. It is indicated that CsPbBr x I (3-x) single crystals have good shape and thermal stability, and the thermal stability is better with the iodine content increases. Increase of iodine element reduces the impurities doping and improves the purity of the single crystal. The results show a great potentially high performance for optoelectronic devices.
The effects of SO2 flow rate, SO2 mole fraction, iodine content and water content on the Bunsen reaction were experimentally studied for the thermochemical iodine–sulfur cycle for hydrogen production. One multistage reaction mechanism on the Bunsen reaction has been hypothesized, considering the kinetic characteristics. The appearance of a liquid–liquid equilibrium (LLE) phase separation was in the range of 20–40 min in the apparatus we chose. An increase in iodine content and a decrease in water content improved LLE separation characteristics to the H2SO4 phase and HIx phase. The H2S formation side reaction easily occurred with the increase in water content and decrease in iodine content. The optimal operating condition that the inlet SO2 mole fraction exceeds 0.12 coupled with initial I2/H2O molar ratio exceeding 0.284 has been proposed based on the experimental results, for the criteria of improving the separation characteristics and preventing side reactions.
Liu Xuan,Cui Enna,Wang Mengxiao,Zhu Yujie,Li Hongliang,Guo Chao
We present a novel approach for iodide sensing based on the heavy-atom effect to quench the green fluorescent emission of organosilicon nanoparticles (OSiNPs). The fluorescence of OSiNPs was significantly quenched (up to 97.4% quenching efficiency) in the presence of iodide ions (I – ) through oxidation by hydrogen peroxide. Therefore, OSiNPs can serve as a fluorescent probe to detect I – with high selectivity and sensitivity. The highly selective response is attributed to the hydrophilic surface enabling good dispersion in aqueous solutions and the lipophilic core allowing the generated liposoluble I 2 to approach and quench the fluorescence of OSiNPs. The linear working range for I – was from 0 to 50 μM, with a detection limit of 0.1 μM. We successfully applied this nanosensor to determine iodine content in edible salt. Furthermore, the fluorescent OSiNPs can be utilized for the determination of total antioxidant capacity (TAC). Antioxidants reduce I 2 to I – , and the extent of quenching by the remaining I 2 on the OSiNPs indicates the TAC level. The responses to ascorbic acid, pyrogallic acid, and glutathione were investigated, and the detection limit for ascorbic acid was as low as 0.03 μM. It was applied to the determination of TAC in ascorbic acid tablets and fruit juices, indicating the potential application of the OSiNP-based I 2 sensing technique in the field of food analysis. Graphical Abstract
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