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Solid–gas thermochemical sorption heat storage is an efficient heat storage technology. Due to its high theoretical heat storage density, magnesium sulfate (MgSO4) is considered as one of the most potential sorption heat storage materials. Using zeolite 13X as the matrix, zeolite 13X/MgSO4 composite adsorbents were prepared, and the sorption–desorption performance was studied to reveal the potential heat storage capacity of the composite adsorbents. The addition of zeolite 13X aimed to enhance the hydration reaction rate by increasing the reaction surface area. The heat storage capacity of zeolite 13X/MgSO4 composite adsorbents with the salt mass fraction increasing from 5% to 20% was experimentally studied. Results showed that the composite sorbent with 20% MgSO4 offers the best heat storage performance. Under conditions of 25 °C and 60% RH, the mass sorption capacity of the composite sorbent containing 20% MgSO4 was 0.21 g g−1, and a heat storage density of 438.4 kJ kg−1 was achieved. With the mass fraction of MgSO4 being reduced from 20% to 5%, the sorption capacity and heat storage density of the composite decreased to 0.187 g g−1 and 378.8 kJ kg−1, respectively. To further enhance mass transfer, an appropriate amount of LiCl was added into the composite sorbent with 20% MgSO4, verifying that LiCl can not only improve the adsorption rate, but also increase the sorption capacity by 8.6%. [ABSTRACT FROM AUTHOR]

In this research, a ternary Cu-CuTCPP/Cu2O/CoAl-LDH composite with a dual Z-scheme heterostructure was fabricated based on a Cu2O photocatalyst and applied in photocatalytic CO2 reduction. The physicochemical properties of the prepared catalysts and the possible reaction mechanism in CO2 reduction were analyzed and studied by various characterization methods. The activity of CO2 reduction significantly increased, especially forming C2 products. The optimal yield of C2H4 and C2H6 reached 1.56 and 1.92 μmol g−1 h−1 respectively, which was 14.45 and 17.45 times that from using the Cu2O monomer. In addition, the selectivity of C2 products reached 37.4%. The satisfactory C2 yield was mainly due to the fact that Cu1+δ2(COO)3 nodes in Cu-CuTCPP contained adjacent Cu sites, which effectively promoted the C–C coupling reaction. Moreover, the dual Z-scheme heterojunction stimulated the separation of photogenerated electron–hole pairs and diminished the recombination rate. This work contributes to the development of novel photocatalysts with a dual Z-scheme heterojunction and facilitates the generation of valuable C2 products. [ABSTRACT FROM AUTHOR]

Energy shortage and global warming caused by the extensive use of fossil fuels are urgent problems to be solved at present. Photoreduction of CO2 is considered to be a feasible solution. The ternary composite catalyst g‐C3N4/Ti3C2/MoSe2 was synthesized by hydrothermal method, and its physical and chemical properties were studied by an array of characterization and tests. In addition, the photocatalytic performance of this series of catalysts under full spectrum irradiation was also tested. It is found that the CTM‐5 sample has the best photocatalytic activity, and the yields of CO and CH4 are 29.87 and 17.94 μmol g−1 h−1, respectively. This can be ascribed to the favorable optical absorption performance of the composite catalyst in the full spectrum and the establishment of S‐scheme charge transfer channel. The formation of heterojunctions can effectively promote charge transfer. The addition of Ti3C2 materials provides plentiful active sites for CO2 reaction, and its superior electrical conductivity is also favorable for the migration of photogenerated electrons. [ABSTRACT FROM AUTHOR]

Metal–organic frameworks (MOFs) as popular nanomaterials have outstanding application prospects in water sorption applications due to their unique structures with excellent properties, such as high porosity, large specific surface area, nanoscale features, reticulation structure, and controllable adjustment of the pore size. Sorbents require high water sorption and water stability to collect, utilize, or remove water. The structure of most MOFs is destroyed upon contact with water, which greatly limits their practical application. This paper summarizes the internal mechanism of water-stable MOFs and describes the optimal design strategy of water-stabilized MOFs based on the structural design of water-stabilized MOFs and the modification of existing MOFs. This review summarizes and analyzes the current typical MOF synthesis and preparation methods. Solutions are proposed for the problems of MOFs in terms of the synthesis mechanism, mass production, and application, and the manufacturing strategies and long-term reliability of MOFs are also prospected. The water sorption mechanism of water-stable MOFs and the influencing factors of water sorption behavior are described, and the optimization strategy of the water sorption performance of MOFs is proposed in terms of the microstructure, surface functional groups, and electron group hybridization. Meanwhile, the current challenges are summarized according to the characteristics of water-adsorbing MOFs, and the future development of MOFs are prospected. It is expected to provide a valuable reference for the research direction of the application of MOFs in water sorption. [ABSTRACT FROM AUTHOR]

The photocatalytic reduction of CO2 to hydrocarbons is expected to simultaneously alleviate the energy crisis and greenhouse effect. Herein, the ternary BiOCl/C/Cu2O catalysts with different mass ratios were compounded using a simple hydrothermal method, revealing better photocatalytic activity than the monomer. In the absence of sacrificial agents and photosensitizers, 25% BiOCl/C/Cu2O showed optimal photocatalytic performance. The CO and CH4 yields over 25% BiOCl/C/Cu2O reached 26.77 and 9.86 μmol g−1 h−1, which is 2.9 and 8.7 times higher than that of the pristine Cu2O, respectively. The ameliorative activity can be attributed to the construction of the Z-scheme heterostructure and carbon layer, which are conducive to the transfer and separation of photogenerated carriers. This study offers valuable references for the design and investigation of a Z-scheme heterojunction using a carbon layer as an electron transfer medium. [ABSTRACT FROM AUTHOR]