Near-infrared (NIR) spectroscopy technology combined with chemometric algorithms was used to determine the mixing end-point of Xuefu Zhuyu capsule raw powder and find the shortest mixing time.
Coal chemical wastewater contains large number of phenolic substances, which cause great harm to the environment. The dephenolization of wastewater from coal chemical enterprises was investigated. Through the combined treatment of oil removal, concentration, adsorption and other processes, the final processing results achieved the anticipated goal.
This work has explored the possible defects in Mn-doped SnO 2 and compared the effects of interstitial Mn and oxygen vacancies on the electronic structure of SnO 2 . Combining the DFT calculations and experimental measurements, we found that when the Mn-doped SnO 2 is synthesised under Sn-rich or O-poor conditions, the defect pair of Mn substitution and interstitial rather than oxygen vacancy will be formed, which induces energy band across the Fermi level and significantly affects the electronic structure of SnO 2 . With the Mn interstitials, stable intrinsic multi-level resistive states and optical SET can be achieved in the Mn-doped SnO 2 memristors. This result can provide guidance in the fabrications of defective metal oxides and promote the investigations on cationic interstitial triggered multi-level resistive switching and optoelectronic memristors.
Enhancing the CO2 mass transfer and proton supply in the photocatalytic reduction of CO2 with H2O into CH3OH (PRC-M), while avoiding the hydrogen evolution reaction (HER), remains a challenge. Herein, we propose an approach to control the surface coverage of CO2 and H2O by modifying interfacial wettability, which is achieved by modulating the core-shell structure to expose either hydrophobic melamine-resorcinol-formaldehyde (MRF) or hydrophilic NiAl-layered double hydroxides (NAL). Characterizations reveal that an insufficient proton supply leads to the production of competing CO, while excessive coverage of H2O results in undesired HER. The NAL-MRF integrates hydrophobic and hydrophilic interfaces, contributing to the CO2 mass transfer and H2O adsorption, respectively. This combination forms a microreactor that facilitates the triphase photocatalysis of CO2, H2O, and catalyst, allowing for high local concentrations of both *CO and *H without competing binding sites. Importantly, the formation of covalent bonds and a Z-type heterojunction between hydrophilic NAL and hydrophobic MRF layers accelerates the charge separation. Furthermore, the density functional theory results indicate that the NAL linking promotes the continuous hydrogenation of *CO. As a result, an enhanced CH3OH yield of 31.41 μmol g-1 h-1, with selectivity of 93.62%, is achieved without hole scavengers or precious metals.
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