Indole is an important industrial substance derived from wash oil, and the traditional alkali fusion method causes serious environmental problems. In this research, imidazolium-based ionic liquids (IBILs) were developed as new extraction agents to separate indole from wash oil with extraction efficiencies more than 90%.The influence of the structure of IBILs was explored. The extraction efficiency and the distribution coefficient of indole were used as the indexes to evaluate the IBILs extraction ability. The key experimental parameters such as initial indole concentration, extraction time, extraction temperature, and volume ratio of IBILs-to-model wash oil were investigated to obtain the optimum condition. The separation mechanism was studied by analyzing the chemical bonds using spectrographic analysis and molecular simulation. IBILs were recycled by back-extraction and exhibited good recycling properties with no obvious reduction and high extraction efficiency. Finally, the optimal process was conducted based on the process simulation.

The improvement of the photocatalytic performance of cobaltporphyrin as CO2 reduction catalysts by chemical modification has become a current research hotspot. Here, we contrastively investigate the catalytic performance of the two-dimensional (2D) cobaltporphyrin-based organic frameworks linked with phenyl, CoO-cluster, ZnO-cluster, and ZrO-cluster as CO2 reduction photocatalysts (abbreviated as CoP, Co-PMOF, Zn-PMOF, and Zr-PMOF, respectively) using density functional theory (DFT) computations. The computational results demonstrate that the 2D Co-PMOF exhibits superior catalytic activity than other MOFs in direct reduction of CO2 without introducing any cocatalysts, in which CH4 is final product with the lowest limiting potential of 0.39 V among all the reported data. The superior photocatalytic performance should be ascribed to highly accessible active sites on the double sides and the collaborative contribution from CoO-cluster and cobaltporphyrin during CO2 reduction. Therefore, our work may pave the way to extend the potential applications of 2D porphyrin-based MOFs toward photocatalytic CO2 reduction.

Development of efficient bifunctional electrocatalysts for reversible oxygen reduction (ORR) and oxygen evolution reactions (OER) are of prime importance in rechargeable metal-air batteries. In this work, a relatively unexplored and...

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