Novel carbon quantum dots modified potassium titanate nanotubes (CQDs/K2Ti6O13) composite was synthesized and exhibited high photocatalytic activity for degradation of amoxicillin under UV and visible lights with nine wavelengths. Better amoxicillin removal was achieved at lower wavelength irradiation due to its higher photo energy. 相似文献
The preparation of three Tc(IV) alcoholato complexes: K2[99Tc(OMe)6], K2[99Tc(glyc)3·3C2H5OH (H2glyc = CH2OHCH2OH), and K2[99Tc(butri)2]·CH3OH (H3butri = CH2OHCHOHCH2CH2OH) is described. 相似文献
In view of the continuously worsening environmental problems, fossil fuels will not be able to support the development of human life in the future. Hence, it is of great importance to work on the efficient utilization of cleaner energy resources. In this case, cheap, reliable, and eco-friendly grid-scale energy storage systems can play a key role in optimizing our energy usage. When compared with lithium-ion and lead-acid batteries, the excellent safety, environmental benignity, and low toxicity of aqueous Zn-based batteries make them competitive in the context of large-scale energy storage. Among the various Zn-based batteries, due to a high open-circuit voltage and excellent rate performance, Zn-Ni batteries have great potential in practical applications. Nevertheless, the intrinsic obstacles associated with the use of Zn anodes in alkaline electrolytes, such as dendrite, shape change, passivation, and corrosion, limit their commercial application. Hence, we have focused our current efforts on inhibiting the corrosion and dissolution of Zn species. Based on a previous study from our research group, the failure of the Zn-Ni battery was caused by the shape change of the Zn anode, which stemmed from the dissolution of Zn and uneven current distribution on the anode. Therefore, for the current study, we selected K3[Fe(CN)6] as an electrolyte additive that would help minimize the corrosion and dissolution of the Zn anode. In the alkaline electrolyte, [Fe(CN)6]3– was reduced to [Fe(CN)6]4– by the metallic Zn present in the Zn-Ni battery. Owing to its low solubility in the electrolyte, K4[Fe(CN)6] adhered to the active Zn anode, thereby inhibiting the aggregation and corrosion of Zn. Ultimately, the shape change of the anode was effectively eliminated, which improved the cycling life of the Zn-Ni battery by more than three times (i.e., from 124 cycles to more than 423 cycles). As for capacity retention, the Zn-Ni battery with the pristine electrolyte only exhibited 40% capacity retention after 85 cycles, while the Zn-Ni battery with the modified electrolyte (i.e., containing K3[Fe(CN)6]) showed 72% capacity retention. Moreover, unlike conventional organic additives that increase electrode polarization, the addition of K3[Fe(CN)6] not only significantly reduced the charge-transfer resistance in a simplified three-electrode system, but also improved the discharge capacity and rate performance of the Zn-Ni battery. Importantly, considering that this strategy was easy to achieve and minimized additional costs, K3[Fe(CN)6], as an electrolyte additive with almost no negative effect, has tremendous potential in commercial Zn-Ni batteries.相似文献
Paramagnetic species formed during the vacuum thermal decomposition of Mg- and K-sulfites and -thiosulfates are identified by EPR.
During the thermal decomposition of the magnesium compounds, SO−2 is observed as a radical stabilized at the surface of the solid residue.
In the case of K2SO3, another SO−2 radical species is observed; this SO−2 is formed inside the crystalline lattice of K2SO3 as a result of dislocations during the thermal treatment. If K2SO3 results from the “in suit” decomposition of K2S2O3 1/3H2O, we observe moreover that the decomposition of the thiosulfate is accompanied with the intermediary formation of SO−2 and S−??? radicals. The combined thermal analysis techniques of thermogravimetry and EPR show that K2Mg(S2O3)2. 6H2O decompose in the same manner as an equimolar mixture of K2S2O3·1/3H2O and MgS2O3·6H2O. 相似文献
Potassium cobalt hexacyanoferrate(II), K2CoFe(CN)6 · 1.4H2O, loses its water when heated up to 170°C, and the anhydrous compound begins to decompose above 230°C. The cyanide groups are evaporated off in the temperature range 230–350°C, and the solid products thus formed are K2CO3, Fe2O3, Co3O4 and CoFe2O4. In the range 550–900°C, the cobalt-containing compounds become CoO, and K2CO3 probably partly decomposes to K2O, so that the product mixture at 900°C is K2CO3/K2O, Fe2O3 and CoO. Above this temperature, K2CO3 decomposes to K2O. 相似文献