ENERGY
·
2026
·
IF 10.1
Feiyang Xu,Jing Li,Zhen Zhu,Chuting Lai,Wenluo Li,Niansi Li,Bendong Yu
In hot and humid climates, establishing continuous and energy-efficient humidity control strategies is crucial for improving indoor environmental quality. However, most existing adsorption dehumidification systems are unable to operate continuously due to the necessary regeneration process of adsorbent materials. Therefore, this study proposes a solar-driven dual-channel ventilated Trombe wall system based on MOFs, which achieves 24-h continuous indoor dehumidification via alternating adsorption-desorption operations. MOFs/CF is employed as the adsorption bed. Two identical beds operate in an alternating manner, utilizing cold and hot water circulation to provide the driving force for the adsorption and regeneration processes, respectively. Cold water is supplied at 25 °C and hot water is provided by solar energy. The comprehensive performance of the system is evaluated through modular experimental testing and numerical simulations. Experimental results demonstrate that the MOFs/CF adsorption bed achieves a maximum adsorption capacity of 0.91 g/g. Elevating the desorption temperature enhances the regeneration performance; at a desorption temperature of 80 °C, the peak relative humidity difference between the inlet and outlet air reaches 12.8%. Furthermore, simulation results reveal that with a single adsorption bed featuring an effective area of 0.4 m 2 and an MOF loading of 0.96 kg, the system achieves its maximum dehumidification capacity under the 80 °C condition. In this scenario, the system completes approximately five cycles within 24 h and yields a total daily moisture removal of 4.54 kg. In addition, the system demonstrates superior overall performance under the 70 °C condition, where the thermal driving efficiency peaks at 87.22%.
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高影响因子
RARE METALS
·
2025
·
IF 11
Chen Taoran,Qin Tian,Sun Hongli,Su Chenliang
Photocatalytic oxidation of toluene to valuable benzaldehyde offers a promising pathway for sustainable production of fine chemicals and pharmaceuticals. In this process, photogenerated holes play a crucial role in C(sp 3 )-H bond dissociation. However, the photocatalytic performance of current photocatalysts is often hindered by the low separation and transfer efficiency of photogenerated charges. In this work, we presented a perovskite-based heterostructure via in situ growth of defective WO 3- x nanosheets on Cs 2 AgBiBr 6 nanoparticles for photocatalytic toluene transformation. In situ Fourier transform infrared spectroscopy tests proved the introduction of oxygen-deficient WO 3- x component enhanced the chemisorption of molecular oxygen. The in situ electron paramagnetic resonance and 4-chloro-7-nitro-1,2,3-benzoxadiazole fluorescence measurements further confirmed the presence of oxygen vacancies, and the formation of heterostructure synergistically accelerated the formation of the superoxide radicals and the transfer of photogenerated charge carriers. Under visible light irradiation, Cs 2 AgBiBr 6 /WO 3- x photocatalyst could effectively oxidize toluene toward benzaldehyde with a conversion rate of 9020 μmol g −1 h −1 , which was a 3.5-fold increase over that of the unmodified Cs 2 AgBiBr 6 . Graphical abstract
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高影响因子
MICROPOROUS AND MESOPOROUS MATERIALS
·
2024
·
IF 4.8
Yuxin Li,Juanping Zhou,Hu Wen,Haitao Yin,Shunyu Han,Nanzhe Jiang
Clay is a rich aluminosilicate resource with unique advantages as a raw material for zeolites production. However, synthesizing nanosized single-crystalline zeolites through a simple approach using clay remains a significant challenge. In this paper, acid-washed montmorillonite (MSR) was used to prepare nano-H-ZSM-5 single crystals with high crystallinity, uniform grain size and permeable straight pores under the induction of a small amount of organic template tetrapropylammonium hydroxide (TPAOH). Through temperature-staged treatment, the nucleation and growth process of zeolite were decoupled, ultimately achieving precise control over the size of the nano-single crystals. Mechanistic study showed that the low-temperature aging process produces smaller structural units which probably derived from the geopolymer topology of the clay, providing more active sites for zeolite nucleation, leading to the rapid crystallization during the high-temperature process. The porous structure promotes material diffusion, inhibits aromatic cycling and reduces carbon formation in the pores. The large specific surface area and nanoscale multilayer pore structure delay carbon accumulation and increase carbon holding capacity. These properties make nano-ZSM-5 single crystals an excellent choice for high olefin selectivity and long catalytic life in the methanol-to-olefin reaction. This synthetic route provides a general strategy for preparing nanosized zeolite single crystals from clay.
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高影响因子
JOURNAL OF ELASTOMERS AND PLASTICS
·
2023
·
IF 1.7
Xiaoyong Yang,Xiaofang He,Fuqin Xu,Zhaoyang Hou,Zhihui Ma,Jing Cai,Ruimin Jiao
With the rapid development of electronic devices and rubber tires, the industry has put forward new requirements for the heat dissipation of rubber components. With excellent thermal conductivity, oxidation resistance, and thermal stability, hexagonal boron nitride (h-BN) is often added to plastics or rubber as a thermally conductive filler, but is less effective when used directly. In this study, h-BN-K was prepared by direct modification of the mixed solution of KH-550, and KH-570, while h-BN-PK was prepared by co-modification of dopamine, KH-550, and KH-570. Two modified h-BN were added to natural rubber (NR) to improve the vulcanization properties, mechanical properties, and thermal conductivity. It was found that the tensile strength and thermal conductivity of 20 wt% h-BN-PK/NR composites were 30.6 MPa and 0.335 W/mK, which were 39.1% and 110.7% higher compared to pure NR (22.0 MPa and 0.159 W/mK), respectively. In addition, the addition of h-BN improved the thermal stability performance of NR to some extent. In conclusion, the h-BN-PK/NR composites provide a certain reference for the use of thermally conductive NR and suggest new ideas for heat dissipation of electronic devices.
研究领域:
材料科学
·
高分子化学
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高影响因子
CERAMICS INTERNATIONAL
·
2022
·
IF 5.532
Fan Zhang,Mao chen,Hailong Wang,Gang Shao,Yongshun Qi,Chengliang Ma,Bingbing Fan,Xiaoxuan Pian,Rui Zhang,Hongxia Li,Yongqiang Chen
The h-BN/ZrO 2 composites with different 3Y–ZrO 2 content were prepared by spark plasma sintering at 1800 °C. The sintering behavior , bulk density, apparent porosity , thermal conductivity , thermal expansion coefficient , bending strength , thermal shock resistance , microstructure and phase were analyzed. The optimum specimens were used to test the resistance to corrosion of molten steel for 10, 20, 40, 80 min respectively. The results indicated that ZrO 2 could facilitate the sintering process of h-BN matrix under the action of spark plasma. Especially, for the composites with 30 wt% 3Y–ZrO 2 , the porosity could decrease to 1.1% and the flexural strength could exceed 150 MPa. The microstructure showed the h-BN grains and 3Y–ZrO 2 grains are closely combined. The XRD patterns indicated that the t-ZrO 2 diffraction peak gradually enhanced with the increase of density. With the increase of erosion time, the erosion rate increased significantly. After the surface of the specimen is eroded, the erosion resistance of the matrix would decrease significantly. This h-BN/ZrO 2 could be as side-dam used in the thin strip continuous casting process .
研究领域:
材料科学
·
陶瓷工程
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高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2022
·
IF 9.136
Zhihui Wei,Jie Li,Lixia Yang,Siyu Liu,Haicheng Li,Mingxia Lu,Tiantian Ying,Yan Luo,Kexin Li,Zhenglin Chen,Xiuping Zhang,Shenglian Luo
Degradation of halogenated organic compounds using the electro-reduction process is a promising approach for advanced water treatment. In this work, antiferromagnetic Co 3 O 4 nanoparticles were first loaded on a uniform anodic porous TiO 2 surface through a hydrothermal strategy, then subjected to an electrochemical reduction, which transform from nanoparticle-shape to interconnected nanoflakes. Compared with the pristine Co 3 O 4 nanoparticles, the morphologically transformed Co 3 O 4 cathode features a porous interface with amorphous Co(OH) 2 and CoOOH shell, which favors the generation of abundant •OH radicals along with lower overpotential for reducing H + to H*. On account of the plentiful radicals and self-supporting nature, the resulting Co 3 O 4 cathode retains high activity for efficiently degrading Thiamphenicol in water, even after 10 h run, demonstrating remarkable durability. Moreover, it is adaptable in a wide pH window of 3 to 10, and effectual when the initial Thiamphenicol concentration increases from 0.5 to 50 mg/L regardless of the water background (tap water, lake water, or river water). This study delivers a profound cognition about the dynamic behaviors of Co 3 O 4 -based electrocatalysts applied in eliminating halogenated antibiotics.
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高影响因子
FUEL
·
2022
·
IF 8.035
Mengjiao Xing,Yunlei Chen,Jian Cao,Yuanlong Han,Zhichao Tao,Fei Wang,Kun Hao,Ling Zhang,Wentao Zheng,Hongwei Xiang,Yong Yang,Yongwang Li,Xiaodong Wen
Understanding the catalytic structure–activity relationship over active sites is of fundamental importance in heterogeneous catalysis field. Herein, a series of H-ZSM-5 zeolites with Al pairs contents in the range of 31% to 82% are used to explore the structure sensitivity of olefin aromatization reaction. Compared with high reaction temperatures (385 ℃ and above), prominently different initial aromatic yields are observed over the samples at 150 ℃. In addition, the 1-octene temperature-programmed surface reaction (TPSR) and theoretical calculation results give a thorough understanding on active site dependent activation temperature (100 vs 150 ℃ over Al pairs and single Al). However, the catalytic cycle of olefin aromatization is not sustainable at low reaction temperature, which is due to the formation and blocking of big molecules in the micropores (e.g., trimethylbenzene etc.). In conclusion, the desorption of big molecules is the rate-determining step for olefin aromatization reaction over H-ZSM-5, which masks the structure sensitivity over Al pairs and single Al.
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高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
·
2022
·
IF 24.319
Heng Ye,Shengnan Wang,Yong Wang,Peiting Guo,Liying Wang,Chengke Zhao,Shuqing Chen,Yimai Chen,Hongqi Sun,Shaobin Wang,Xing Ma
Wastewater remediation using micro/nanomotors is a hot topic, and MnO 2 based materials have become fascinating alternatives to rare noble metal-based micro/nanomotors. Herein, we demonstrate facile and large-scale synthesis of Fe-MnO 2 core-shell micromotors for antibiotic pollutant removal. Heat-treatment results in a phase transformation of MnO 2 with formation of iron oxides and partially exfoliates the MnO 2 nanoplate shell structure to promote mobility. The iron-manganese oxide micromotors exhibit an efficient removal of tetracycline antibiotics via a combination of catalytic degradation and adsorptive bubble separation. For the first time, atomic H* was found to participate in the micromotor-assisted degradation process, resulting in optimal Fenton reaction in neutral conditions with a good decontamination performance. Owing to the merits of abundance, magnetic recovery, facile fabrication, good motion, and environmental friendliness, as well as decontamination performance in a wide pH range, these core-shell micromotors demonstrate a promising candidate in practical wastewater treatment .
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高影响因子
Catalysis Science & Technology
·
2022
·Vol. 12
·期 6
·1788-1798
·
IF 6.177
Jing Zhao,Yanzhuo Zhang,Hucheng Zhang,Haiyan Wang,Jianji Wang
Hydrogen spillover is an important theme for hydrogen storage and H-involving catalytic reactions. This work shows that catalytic reactivity and selectivity can be revealed by differentiating the energetic characteristics of spilled H species. With the assistance of Ti, F and C in MXenes, Pd1.8Ni@Ti3C2Tx presents a high capacity for spillover hydrogen storage at ambient temperatures, and the rich oxygenated groups act as the main carriers of hydrogen spillover around metal nanoparticles. Thermodynamic analysis reveals that the catalytic performances are energetically dominated by the adsorption enthalpies of the active spilled H species rather than the amount of spillover hydrogen, and can be tuned by alloying and surface modification. The ideas are verified from the excellent catalysis, chemoselectivity and stereoselectivity of Pd1.8Ni@Ti3C2Tx in semihydrogenations. The strategy of maximizing catalytic performances is applicable to other Pd-based bimetals@Ti3C2Tx, such as Pd2.6Co@Ti3C2Tx and Pd1.5Fe@Ti3C2Tx, and provides new energetics perspectives to understand the catalytic mechanism in spillover-involving chemical procedures.
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高影响因子
ENVIRONMENTAL RESEARCH
·
2022
·
IF 8.431
Xiang Meng,Jianlong Wang,Lejin Xu
To further improve the treatment capacity of actual wastes, H + was introduced into the homogeneous Fenton system as a co-catalyst for dissolution and degradation of the mixed nuclear-grade cationic and anionic exchange resins. The effects of acid type and concentration, catalyst type and concentration, H 2 O 2 dosage, initial temperature, antifoaming agent and resin ratio were studied. The concentration of inorganic acid , type and concentration of catalyst had significant influence on the decomposition of mixed resins. The experimental results showed that when the mixing ratio of resins was 1:1, the initial temperature was 96 ± 1 °C, the amount of H 2 O 2 was 200 mL, and the concentration of H + /Fe 2+ was 1 M/0.1 M, complete dissolution and 79% weight reduction of mixed resins were obtained. Combined with density functional theory (DFT) calculations, cationic exchange resin and anionic exchange resin showed different reactivity in the experiment. Hydroxyl radicals (•OH) tended to attack –SO 3 - groups with more negative charges, and the barrier energy of –SO 3 - ion dissociation was 8.2 kcal/mol, which caused the cationic exchange resin to be easily destroyed. According to the characterization results, the characteristic intermediates were determined, indicating that desulfonation, valence change of nitrogen atom , and cleavage of long-chain carbon skeleton existed during the reaction, but incomplete oxidation still remained.
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PubMed
高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
·
2022
·
IF 24.319
Dongxue Zhou,Xiangdong Xue,Xing Wang,Qingjie Luan,Ang Li,Liguo Zhang,Baozhen Li,Wenjun Dong,Ge Wang,Changmin Hou
Element doping is an excellent strategy to promote charge separation and reaction kinetics of photocatalyst, which plays significant role in accelerating the sustainable energy development process. Herein, Ni, In co-doped ZnIn 2 S 4 photocatalyst was prepared by a microwave-assisted solvothermal method. The rapid crystallization of ZnIn 2 S 4 resulted in partial In atoms substituted Zn atom during the formation of [ZnS] 4 layer. In doping in tetrahedral Zn sites increases the electron delocalization around In sites, hence reduces the electronic potential wells along Z axis. Ni doping in tetrahedral Zn sites decreases the negative charge on the S sits, which balances the H adsorption/desorption, further boosting the photocatalytic activity. As a result, Ni, In co-doped ZnIn 2 S 4 possess an optimal photocatalytic H 2 evolution property of 21.94 μmol·h −1 , which is nearly 1.8 and 6.1 times of In-ZnIn 2 S 4 (11.78 μmol·h −1 ) and ZnIn 2 S 4 (3.6 μmol·h −1 ).
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高影响因子
ELECTROCHIMICA ACTA
·
2022
·
IF 7.336
Geng Cheng,Zhen Li,Erli Qu,Shan Ren,Dongmei Han,Min Xiao,Shuanjin Wang,Yuezhong Meng
It's of significant importance for the development of proton exchange membranes with low phosphoric acid (PA) uptake, high proton conductivity, better proton conduction stability and low production-costs for high temperature proton exchange membrane fuel cells (HT-PEMFCs). Featured with variable structure and diversified functionality, porous organic networks are newly emerged filler materials for polyelectrolytes in energy conversion field. In this work, a typical Schiff-base type porous polymeric network (SNW-1) with abundant N H sites was synthesized and blended with ether-type polybenzimidazole (PBI) for the first time. The thermal and chemical stability of the as-prepared composite membranes completely satisfy the practical requirements of HT-PEMFCs. The constructed consecutive proton conduction channels endow the composite membranes higher proton conductivity with low PA uptake. When the doping content of SNW-1 reached 30%, the PBI/30%-SNW-1 membrane showed much higher proton conductivity with lower PA uptake (114.0 mS cm −1 , 175.0%) comparing with those of the pristine PBI (67.3 mS cm −1 , 270.0%) at 160 °C. The PBI/ x %-SNW-1 membranes also exhibited better proton conduction stability. After 30 h of long-time evaluation at 140 °C, PBI/30%-SNW-1 composite membrane gives only an 8.47% decay of proton conductivity, which is lower than that of the pristine PBI (12.84%). The preparation procedure of PBI/ x %-SNW-1 composite membranes is simple, which provides a potential pathway for the development of high-performance proton exchange membrane for HT-PEMFCs.
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高影响因子
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