RESEARCH ON CHEMICAL INTERMEDIATES
·
2026
·
IF 3.3
Xu Ying-Yu,Wang Shuang,Zhu Han-Dong,Wang Shuo,Feng Xiao-Qian,Wang Huan,Zhao Yong-Hua
Photo-thermal synergistic catalysis offers a promising route for low-temperature and efficient hydrogen production, in which the design of catalysts is crucial. In this study, a series of promoter-modified Cu supported on ZnO (M-Cu/ZnO, M = Al, Zr, Co, Ce) were designed and prepared via a controllable hydrothermal synthesis strategy, and their catalytic performance in photo-thermal methanol steam reforming (MSR) for hydrogen production was systematically investigated. By varying the type of promoter, precise modulation of the catalyst's textural properties, metal-support interactions, and distribution of active sites was achieved. Characterization results revealed that the introduction of Al promoters significantly enhanced the dispersion of Cu species on the ZnO surface and strengthened metal-support interactions, thereby effectively suppressing the sintering and deactivation of active components during the reaction. Under photo-thermal MSR conditions of 240 °C, 0.1 MPa, and a space velocity of 17 300 mL·g −1 ·h −1 , the Al-Cu/ZnO catalyst exhibited the optimal catalytic performance, achieving a methanol conversion of 97.08% and an H 2 yield of 99.14 mL·g −1 ·min −1 , with only an 11% decrease in conversion after 10 h of continuous operation, demonstrating excellent stability. This work elucidates the structure–activity relationships in multicomponent Cu/ZnO catalysts for photo-thermal MSR from the perspective of promoter engineering, providing both experimental evidence and design insights for the development of efficient and stable solar-driven hydrogen production catalyst systems.
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高影响因子
CELLULOSE
·
2023
·Vol. 30
·期 8
·5171-5185
·
IF 5.7
Zhao Bencheng,Li Chengze,Chen Yongfang,Tian Qiong,Yurekli Yılmaz,Qiu Fengxian,Zhang Tao
To handle the increasingly harsh living space caused by extreme temperatures and floods of electromagnetic waves, wearable materials have been attracting much attention for decades due to their good versatile compatibility and precise utility. In this work, a Janus MXene/cellulose/ZnO nanorods membrane for accurate on-demand personal thermal management and electromagnetic interference shielding was fabricated via hydrothermal treatment and vacuum-assisted filtration, followed by a hydrophobization process. The ZnO nanorod side of obtained Janus membrane exhibits a high visible reflectance (96.3%) and infrared emissivity in the atmospheric window band (0.837). The corresponding visible absorption and average infrared reflectivity (5–25 μm in wavelength) of the MXene side are over 90% and 0.7, respectively. Remarkable temperature differences on both sides (7 °C increment on MXene side and 5 °C reduction on ZnO side compared to bare wooden board) were achieved in the validation test under direct sunshine, reflecting to the great optical properties and radiative thermal management performances of the obtained membrane. Moreover, the water contact angles (≥ 120°) indicated the hydrophobicity and associated stain resistance of this membrane. Active Joule heating and electromagnetic interference shielding characteristics have been successfully introduced into the Janus membrane by means of the integration of MXene. A rapid increase in temperature to 75 °C was attained within a 1 min of low voltage (2 V) applying. The effectiveness of the electromagnetic shielding (~ 30 dB) was higher than the commercial shielding materials. The results in general, provide a promising solution to protecting people from temperature extremes and electromagnetic waves interference in modern living space.
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ChemistrySelect
·
2023
·Vol. 8
·期 10
·e202300511
·
IF 2.1
Yu Han,Jinxin Wang,Dawei Qi
Graphical In this paper, an environmentally friendly method for the fabrication of maize straw biochar modified with zinc oxide nanoparticles for the degradation of methylene blue (MB) as a model organic dye was presented. Employing a novel biochar-ZnO nanocomposite material, the high degradation performance was achieved, and propose the mechanism behind it. The enhancement of the biochar-ZnO degradation performance can be ascribed to the synergistic effect of the adsorption of MB and water molecules on porous biochar and the photocatalytic activity of ZnO. As the preparation method of biochar-ZnO nanocomposites is cost-efficient, fast, and environmentally friendly, it is expected the strategy can find its place in real-world applications for dye removal from water. As a new type of environmental functional material, biochar composites have become the focus of considerable interest in wastewater treatment research owing to their excellent adsorption and photocatalytic properties. However, the fabrication of cost-effective biochar composites with high photocatalytic efficiencies at low synthesis temperatures remains challenging. In this study, biochar was prepared using an environmentally friendly hydrothermal method at a low temperature with maize straw as the waste material, instead high costs pyrolysis process. Hexagonal zinc oxide nanoparticles were grown in and on the biochar framework using the chemical deposition method. The adsorption and photocatalytic degradation performance of aqueous methylene blue (MB) solutions were investigated. We demonstrated that the photocatalytic degradation performance of the biochar-ZnO composites was considerably higher than that of the most other reports. The degradation of the MB solutions (60 mg/L) reached 98.0 % in 240 min under low-power ultraviolet light (50 W) irradiation. We propose that the synergetic effect of the high adsorption of the porous biochar and the photocatalytic activity of ZnO led to a high degradation efficiency. This study provides theoretical and practical guidance for the preparation of photocatalytic composites obtained from waste biomass materials by a cost-efficient, fast, and environmentally friendly method, and the efficient degradation of dye pollutants in water.
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CHINESE JOURNAL OF STRUCTURAL CHEMISTRY
·
2023
·
IF 2.2
Qian Liu,Yingyi Wen,Jian-Ze Xiao,Shao-Zhen Luo,Guan-E Wang,Peng-Yi Tang,Xiao-Liang Ye,Gang Xu
The poor sensitivity of metal-oxide (MO) sensing material at room temperature can be enhanced by the modification of noble metal catalysts . However, the large size and uncontrollable morphology of metal nanoparticles (NPs) compromise the catalytic activity and selectivity. Downsizing metal NPs to the atomic level is a promising solution because it offers high activity and selectivity. Nevertheless, a facile and universal approach for stable loading atomic-level metal on MO-based sensing materials is still challenging. Herein, we present a strategy to construct synergetic coordination interface for uniform loading of atomic-level metal catalysts on MO-based gas-sensing materials using a difunctional mediator layer. In this work, atomically dispersed Pt catalysts are coordinately anchored on ZnO nanorods (NRs) using polydopamine (PDA) as a mediator. As a result, compared with pristine ZnO NRs, a six-fold enhanced response of 18,489% is achieved toward 100 ppm NO 2 on 0.20 wt%Pt–ZnO@PDA-1.5 nm, and the selectivity is also promoted. Such sensitivity is higher than that of most reported noble metal-modified MO NO 2 -sensing materials. This work provides a simple and general strategy for building highly sensitive and selective gas-sensing materials using atomic-level noble metal catalyst.
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高影响因子
INORGANIC CHEMISTRY
·
2023
·
IF 4.6
Yao Chen,Lianbo Ma,Xiaoping Shen,Jingxia Qiu,Jiabiao Lian,Zhenyuan Ji,Aihua Yuan,Lirong Kong
Transition-metal oxides as anodes for lithium-ion batteries (LIBs) have attracted enormous interest because of their high theoretical capacity, low cost, and high reserve abundance. Unfortunately, they commonly suffer from poor electronic and ionic conductivity and relatively large volume expansion during discharge/charge processes, thereby triggering inferior cyclic performance and rate capability. Herein, a molybdenum–zinc bimetal oxide-based composite structure (Zn2Mo3O8/ZnO/rGO) with rectangular Zn2Mo3O8/ZnO nanosheets uniformly dispersed on reduced graphene oxide (rGO) has been prepared by using a simple and controllable cyanometallic framework template method. The Zn2Mo3O8/ZnO rectangular nanosheets with desirable porous features are composed of nanocrystalline subunits, facilitating the exposure of abundant active sites and providing sufficient contact with the electrolyte. Benefiting from the composition and structural merits as well as the induced synergistic effects, the Zn2Mo3O8/ZnO/rGO composite as LIB anodes delivers superior electrochemical properties, including high reversible capacity (960 mA h g–1 after 100 cycles at 200 mA g–1), outstanding rate performance (417 mA h g–1 at 10,000 mA g–1), and admirable long-term cyclic stability (862 mA h g–1 after 400 cycles at 1000 mA g–1). The mechanism of lithium storage and the formation of SEI film are systematically elucidated. This work provides an effective strategy for synthesizing promising Mo-cluster compound-based anodes for high-performance LIBs.
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高影响因子
Lubrication Science
·
2023
·Vol. 35
·期 7
·513-527
·
IF 1.9
Qi Liu,Jing Li,Junfeng Zhang,Hengdi Yuan,Ange Nsilani Kouediatouka,Guangneng Dong
Currently, substantial adhesion wear frequently occurs in Zr alloy cold rolling, which not only affects the quality of product's surface, but shortens the mould's service life. In this paper, water-based lubricant was prepared by using ZnO as additive and hydroxyethyl cellulose (HEC) as dispersant. The tribological test results showed the friction coefficient decreased by a maximum of 84.6%, and the friction surface was smooth and flat, with essentially no wear. By analysing the friction area, it was found after ZnO entered the friction interface, HEC carried a hydrated molecular layer to form a stable lubrication film at the interface. This film worked with nanoparticles to reduce friction and wear, and is expected to prolong the service life of rolling dies.
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SEPARATION AND PURIFICATION TECHNOLOGY
·
2023
·
IF 8.6
Wenxue Gong,Xuechun Wei,Yanhu Han,Sidra Subhan,Xin Yu,Tianjian Ji,Wenqing Sun,Yuming Zhang,Zhongfeng Shi,Zhenxia Zhao,Zhongxing Zhao
Herein, ZnO based materials are modified to narrow the photonic band gap, improved utilization rate of visible light and recombination efficiency of photoexcited carriers for the photocatalytic degradation of tetracycline hydrochloride (TCH). For this purpose, a photonic crystal (PC) heterojunction was constructed comprising of nitrogen (N) doped cadmium sulfide (CdS) coupled with ZnO (CdS-N/ZnO) via sacrificial template and multilayer in-situ deposition methods. The constructed PC junction acted as photocatalyst for the effective degradation of TCH under visible light by synergistically promoting the separation efficiency of electron-hole pairs, narrowing the band gap and broadening the light absorption spectrum of ZnO. Moreover, a slow light effect was achieved by adjusting the band gap of the PC overlapped with the wavelength of incident light, which finally enhanced the light harvesting performance of the CdS-N/ZnO photocatalyst. The optimized PC CdS-N/ZnO composites exhibited efficient TCH removal rate of 97.0 % in 90 min and kb as 4.00–15.17 times that of other reported catalysts. Moreover, PC CdS-N/ZnO catalyst achieved 45.2 % mineralization rates reached in 120 min with high stability and reusability for six cycles. HPLC-MS method was used for monitoring the intermediates of TCH degradation, and also analyzing the possible pathways of products. In addition, the toxicity of TCH and its intermediates were also investigated, which showed that the toxicity has effectively been alleviated. The photocatalytic mechanism endowed that ·O 2 – and h + are the major active free radicals in the photocatalytic degradation process, and the electron transport path is type Ⅱ heterostructure. This work will thus envisage a novel vision of designing ZnO photocatalysts for the antibiotic degradation in the practical application of wastewater treatment.
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ADVANCED ENGINEERING MATERIALS
·
2022
·Vol. 25
·期 9
·2201444
·
IF 4.122
Peng-Shuai Bin,Wen-Hao Geng,Tao Wang,Qiangxia Zhu,Min Li,Xiang-Le Liu,Peng-Fei Qian,Ze-Long Bao,Zhi-Xian Yang,Hong-Zhang Geng
Herein, silver nanowires (AgNWs) and aluminum-doped zinc oxide (AZO) are prepared by polyol and gel–sol method, respectively. Then bendable, strong adhesion, flat, and high optical transmittance AgNWs:AZO composite transparent conductive film (TCF) is prepared in an all-solution method. By spinning the AZO to the upper layer of the AgNW networks and annealing at 120 °C for 20 min, the junctions of the AgNW networks are welded by the capillary force in the solvent evaporation and AZO crystallization process. The sheet resistance of the TCF is as low as 12.9 Ω sq −1 at an optical transmittance of 92.1% (@550 nm), which is comparable to the indium tin oxide film on glass. The root means square roughness is reduced from 30.1 to 8.48 nm to match the criteria as anode for organic light emitting diodes (OLEDs). Furthermore, the adhesion between the AgNW networks and the substrate has been significantly improved. Finally, a flexible green OLED device with AgNW:AZO TCF as the anode is successfully prepared. The maximum luminous intensity of the prepared OLED is 10 060 cd m −2 , and the maximum current efficiency is 6.43 cd A −1 , which proves the great potential of the film in flexible electronics.
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高影响因子
NEW JOURNAL OF CHEMISTRY
·
2023
·Vol. 47
·期 7
·3361-3367
·
IF 3.3
Shiqi Cheng,Jin Yang,Shangying Qin,Li Huang,Yuanjin Xu,Yilin Wang
Three-dimensional reduced graphene oxide (3DrGO) and a flower-like zinc oxide (ZnO) crystal were prepared using a hydrothermal method. A stable dispersion of the 3DrGO–ZnO composite was formed by sonication mixing, and was further applied to modify a glassy carbon electrode for direct trace detection of ascorbic acid (AA), dopamine (DA) and uric acid (UA). The structure, composition and morphology of the as-prepared 3DrGO–ZnO composite were characterized using X-ray diffraction, X-ray photoelectron spectroscopy and scanning electron microscopy, respectively. Compared with bare, 3DrGO and ZnO electrodes, the 3DrGO–ZnO electrode exhibited an obvious electrocatalytic enhancement effect. Furthermore, the 3DrGO–ZnO electrode could well distinguish and enhance the differential pulse voltammetry signals of AA, DA and UA. Under the selected conditions, the peak current responses to AA, DA and UA were linear in the range of 100–2500 μmol L−1, 2.00–35.0 μmol L−1, and 1.00–150 μmol L−1, respectively. To verify its possible application, the constructed modified electrode was successfully used for the analysis of real samples with satisfactory results.
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Molecular Catalysis
·
2023
·
IF 4.6
Liping Tan,Yamei Sun,Changjun Yang,Bingguang Zhang,Kejian Deng,Xiaofeng Cao,Yanchuan Guo
Photocatalytic selective oxidation of glycerol to value-added C 3 products is a promising strategy for the valorization of glycerol. In this work, an inorganic/organic composite material by integrating zinc oxide (ZnO) with iron thioporphyrazine (FePz) was prepared to act as photocatalyst for photocatalytic oxidation of glycerol in water. The effects of FePz surface modification on the physicochemical properties and photocatalytic performance of ZnO were systemically studied. More importantly, the integration of ZnO with FePz could markedly improve the visible light absorption ability and effectively promote the separation of photogenerated charges. Meanwhile, introducing FePz onto the ZnO surface was beneficial to the adsorption capacity of glycerol. Just because of this, ZnO/FePz composite exhibited excellent photocatalytic activity for oxidizing glycerol in water, C 3 products including glyceraldehyde and dihydroxyacetone were obtained from this composite photocatalytic system. Additionally, the active species responsible for glycerol oxidation were also determined.
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WATER AIR AND SOIL POLLUTION
·
2023
·Vol. 234
·期 2
·1-12
·
IF 2.9
Khatun Most Munera,Islam Ashraful,Yan Chunjie,Nesa Most Jinnatun
A nano-ZnO semiconductor material loaded with mineral attapulgite (ATP) photocatalyst has been investigated. Using ATP as a carrier, a variety of various mixtures of ZnO/ATP composites was synthesized. A scanning electron microscope (SEM), X-ray diffractometry (XRD), and UV-Vis spectrophotometer (UV-Vis) were used to examine the morphology, synergistic effects, and photocatalytic properties of ZnO/ATP nanocomposites. The target pollutant for photocatalytic degradation is methylene blue solution. When ATP is mixed with pure ZnO, the degrading performance of composite nanomaterials in methylene blue solution is considerably enhanced. The degree of methylene blue degradation increases as the amount of ATP in the composite grows, and the degradation rate of ZnO/40% ATP can reach 96% in 45 min under solar light illumination. The amount of ATP in the system is excessive, and the adsorption effect is visible. The optimal composite ratio was determined to be ZnO/30% ATP. After discovering the ideal composite ratio and synergy of ZnO/ATP, g-C 3 N 4 was compounded in the aforesaid system, dramatically increasing the composite’s photocatalytic activity. At 45 min, the degradation rate of methylene blue reaches 97%. The absorption range and intensity of ternary composites increased, and the photogenerated electron-hole recombination rate decreases significantly. The reaction rate constant increases from 0.033 to 0.069 min −1 . SEM revealed rod-like attapulgite particles packed with tiny zinc oxide particles and a moderate layered structure of C 3 N 4 . The XRD pattern indicated that C 3 N 4 ’s crystallinity is poor and ZnO’s peak intensity is excessively high, masking the composite material’s distinctive peaks. The degradation rate of g-C 3 N 4 /ZnO/30% ATP to methylene blue was found to be 91.5% after 5 cycles.
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ENVIRONMENTAL POLLUTION
·
2023
·
IF 8.9
Jingyi Guo,Na Liu,Qiting Xie,Lizhong Zhu,Fei Ge
Ubiquitous microplastics (MPs) may affect the trophic transfer of nanoparticles (NPs), in turn threatening aquatic organisms and even human health. Thus, this study explored the influence of polystyrene microplastics (PS MPs) on the biotoxicity and biomagnification of ZnO nanoparticles (ZnO NPs) in the aquatic food chain from Chlorella vulgaris ( C. vulgaris ) to Daphnia magna ( D. magna ). The results showed that PS MPs facilitated the biotoxicity of ZnO NPs towards D. magna after dietary exposure. Compared to the control (single ZnO NPs), the heart rate and the level of reactive oxygen species were remarkably increased by 21.25% and 16.32% in the combined system (PS MPs + ZnO NPs), respectively. Notably, PS MPs suppressed the ZnO NPs accumulation in C. vulgaris , while remarkably facilitating the trophic transfer of ZnO NPs to D. magna . The biomagnification of ZnO NPs was evident with a maximal biomagnification factor (BMF) of 1.49 under acute dietary exposure of PS MPs (72 h), but was absent in the single ZnO NPs system (BMF <0.90). Moreover, PS MPs resulted in a larger biomagnification of ZnO NPs with a maximal BMF of 2.11 under chronic dietary exposure (21 days). Furthermore, the Zn element (including ZnO NPs and released Zn 2+ ) was observed to accumulate in the intestine, thus causing ultrastructural damage and lipid droplet (LD) aggregate. Overall, these findings highlight the importance of considering the impact of MPs on co-existed pollutants and contribute to a better understanding of the ecological risks of MPs in aquatic ecosystems .
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