Modulation of Charge Trapping In article number 2208688, Xiaoguang Duan, Xi-Lin Wu, and co-workers show here the Chinese legend “Carp jumps over the dragon gate”. The story is about a brave carp swimming upstream, jumping over the ‘dragon gate’, and turning into a powerful dragon. Their cover design is based on this legend, where the carp carriers one electron from g-C3N4 at the bottom of the waterfall to a single-atom Co catalyst under the ‘dragon gate’.
Iohexol is one of widely used iodine X-ray contrast media, which are considered as iodine sources potentially yielding iodinated disinfection by-products in environmental waters. Therefore, it is necessary to remove iohexol from the source to ensure the safety of drinking water. This study investigated the effect of potassium ferrate on the degradation of iohexol via evaluating the influences factors, including reaction time, potassium ferrate dose, pH, humic acid, and aqueous coexisting ions. The results presented that a small dose of potassium ferrate could effectively remove iohexol in synthetic water samples in approximately 10 min. As pH increasing from 5 to 8, the removal efficiency of iohexol was improved from 31%–32% to over 90%. However, as applied to spiked lake water, potassium ferrate removed 76.3% (pH = 7) of iohexol and part of the dissolved organic matter. Additionally, humic acid, HCO3−, and PO43− were found inhibiting the degradation of iohexol, while SO42− had no significant effect. The reaction kinetics and degradation pathways iohexol were also studied to understand the removal mechanism of potassium ferrate. The rate law equation demonstrated a second-order reaction under the condition of pH = 9, and the rate constant was 0.515 M−1s−1. It was inferred that the possible pathway of potassium ferrate degrading iohexol included dehydrogenation reaction, amide hydrolysis reaction, degradation reaction, deiodination reaction, and hydroxyl addition reaction. Generally, potassium ferrate is promising in practical application of aqueous iohexol removal.
An entry from the Cambridge Structural Database, the world’s repository for small molecule crystal structures. The entry contains experimental data from a crystal diffraction study. The deposited dataset for this entry is freely available from the CCDC and typically includes 3D coordinates, cell parameters, space group, experimental conditions and quality measures.
Abstract Enhancing the cost‐performance ratio is a fundamental objective for the advancement of the photovoltaic sector. In this context, the development of innovative solar cells that offer a straightforward device configuration but high performance is arguably the most crucial element. Herein, an undoped back‐heterojunction crystalline silicon (c‐Si) solar cell is endeavored to be crafted by simply drop‐casting a Ti 3 C 2 T x MXene ethanol colloidal solution onto the backside of an n ‐type c‐Si ( n ‐Si) wafer. Leveraging the good electrical property and stability, as well as the adjustable work function of MXene treated by europium trifluoromethanesulfonate (Eu(OTF) 3 ), the elementary Ag/ZnO/ n ‐Si/MXene/Ag solar cell delivers an impressive power conversion efficiency (PCE) of 12.5%. Moreover, the deposition of a SiO 2 passivation layer through a simple self‐developed electrochemical method increases the PCE further to 13.5% by ameliorating the interfacial contact between MXene and n ‐Si. Moreover, this unencapsulated solar cell exhibits improved stability, compared to the control device without Eu(OTF) 3 treatment and SiO 2 passivation.
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