一种太阳能驱动处理赤泥污水的绿色节能装置

Alumina production will produce a large amount of red mud wastewater every year, which will cause great harm to the surrounding environment. In this study, a solar evaporator using biochar as photothermal material for red mud wastewater treatment was designed. Driven by sunlight, the device can recover water from red mud wastewater and absorb harmful substances in wastewater. This study provides a new idea for green and energy saving treatment of red mud wastewater

In-Plane Oriented Two-Dimensional Conjugated Metal-Organic Framework Films for High-Performance Humidity Sensing

Two-dimensional conjugated metal-organic frameworks (2D c-MOFs) have emerged as a new generation of conducting MOFs for electronics. However, controlled synthesis of thin-film samples with high crystallinity and defined layer orientation, which is beneficial for achieving high-performance devices and reliable structure-property relationship, has remained a challenge. Here, we develop a surfactant-directed two-step synthesis of layered 2D c-MOF films based on benzene and triphenylene ligands linked by copper-bis(diimino) complexes (HIB-Cu and HITP-Cu, respectively). The achieved layered 2D c-MOF films are featured as free-standing, in-plane oriented, and polycrystalline films with domain size up to similar to 8000 nm(2) and a tunable thickness in the range of 8-340 nm. Benefiting from the intrinsic electrical conductivity and quasi-one-dimensional pore channels, a HIB-Cu film based chemiresistive sensor is constructed, displaying effective humidity sensing with a response as fast as similar to 21 s, superior to the reported MOF-powder-based chemiresistive sensors (in the orders of minutes)

Two-Dimensional boronate ester covalent organic framework thin films with large single crystalline domains for neuromorphic memory device

Despite the recent progress in the synthesis of crystalline boronate ester covalent organic frameworks (BECOFs) in powder and thin‐film through solvothermal method and on‐solid‐surface synthesis, respectively, their applications in electronics, remain less explored due to the challenges in thin‐film processability and device integration associated with the control of film thickness, layer orientation, stability and crystallinity. Moreover, although the crystalline domain sizes of the powder samples can reach micrometer scale (up to ~1.5 µm), the reported thin‐film samples have so far rather small crystalline domains up to 100 nm. Here we demonstrate an efficient synthesis of crystalline two‐dimensional (2D) BECOF films composed of porphyrin macrocycles and phenyl or naphthyl linkers (named as 2D BECOF‐PP or 2D BECOF‐PN ) by employing a surfactant‐monolayer‐assisted interfacial synthesis (SMAIS) on the water surface. The achieved 2D BECOF‐PP is featured as free‐standing thin film with large single‐crystalline domains up to ~60 µm 2 and tunable thickness from 6 to 16 nm. The molecular‐level structures are clearly resolved by high‐resolution transmission electron microscopy (HR‐TEM) and selected‐area electron diffraction (SAED) which are supported by density functional theory (DFT) calculation. Due to the high crystallinity, facile thin‐film processability, high mechanical stability as well as the incorporation of electroactive porphyrin monomers, a hybrid memory device composed of 2D BECOF‐PP film on silicon nanowire‐based field‐effect transistor is demonstrated as a bio‐inspired system to mimic neuronal synapses, displaying a learning‐erasing‐forgetting memory process. Pulsed voltage input induces the polarization of the film that is critical to emulate the potentiation of the neuronal membrane. This work paves the way to develop highly crystalline 2D COF thin film as an easy‐to‐fabricate active component applicable for CMOS‐compatible neuromorphic computing