JOURNAL OF PHYSICS D-APPLIED PHYSICS
·
2016
·Vol. 49
·期 31
·315304
·
IF 2.772
Xiaohui Ren,Xiang Qi,Yongzhen Shen,Si Xiao,Guanghua Xu,Zhen Zhang,Zongyu Huang,Jianxin Zhong
2D photocatalytic TiO2/MoS2 hybrid nanosheets (HNs) have been prepared via a facile hydrothermal process. X-ray diffraction patterns and Raman spectra are carried out and confirm a well crystalized anatase and 2H-MoS2 hybridization. Additional morphological and microstructural tests verify a distinct MoS2 framework, indicating the relatively stability of the MoS2 nanosheet platform with a high specific surface area. UV–vis spectra and electrochemical impedance spectra exhibit an enhanced light absorption ability and conductivity of TiO2/MoS2 compared to that of just TiO2. Photoelectrochemical (PEC) tests also demonstrate the photocurrent of 20 : 1 TiO2/MoS2 HNs is greatly improved compared to that of as-prepared TiO2. The saturation current density is about 33 µA cm−2 when the applied potential is 0.2 V, which is nearly twice that of pure TiO2 and four times as high as 5 : 1 TiO2/MoS2 HNs and 1 : 1 TiO2/MoS2 HNs. Besides that, the duration test exhibits no detectable distinction after processing 25 cycles. The improved photocatalytic activities are perhaps derived from the high conductivity and the increased active sites for the introduction of co-catalytic MoS2 nanosheets as well as the positive synergetic effect between the TiO2 and MoS2. This work demonstrates that the as-prepared TiO2/MoS2 HNs may have a great potential application in PEC hydrogen production.
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RSC Advances
·
2016
·Vol. 6
·期 109
·107709-107716
·
IF 3.289
Zhenyuan Ji,Yuqin Wang,Juan Yang,Xiaoping Shen,Qiang Yu,Lirong Kong,Hu Zhou
Herein, Co nanoparticles with high dispersivity were grown in situ on reduced graphene oxide (RGO) nanosheets by an environmentally friendly and facile one-step strategy. The as-synthesized products were characterized by X-ray powder diffraction (XRD), Raman spectroscopy, X-ray photoelectron spectroscopy (XPS), and transmission electron microscopy (TEM). The magnetic and catalytic properties of the RGO/Co nanocomposites were systematically investigated. The results reveal that the RGO/Co nanocomposites have room-temperature ferromagnetic characteristics with Co particle size below single domain size. In addition, these RGO/Co nanocomposites also exhibit excellent catalytic activities toward the reduction of 4-nitrophenol by NaBH4 and enhanced electrocatalytic properties for the oxidation of glucose. It is believed that this eco-friendly and facile route can be extended to synthesize other metal nanostructures on RGO nanosheets with various functions, and provides a new opportunity for the application of graphene/metal nanocomposites.
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JOURNAL OF ENVIRONMENTAL MANAGEMENT
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2025
·
IF 8.4
Zhipeng Li,Ruochun Zhang,Jun Huang,Dandan Yu,Zhanjun Cheng,Guanyi Chen,Peizhe Sun
The continuously growing of municipal solid waste (MSW) has posed a threat to human-being. Pyrolysis is a promising technique for MSW disposal, as it can reduce its volume and produce valuable products as well. This study evaluated the potential of carbon residue (CR) derived from waste carton as soil amendment. Additionally, considering the waste plastics, such as plastic bags, plastic tape, etc., can mix with carton in MSW, the effect of polyvinyl chloride (PVC) addition on the characteristics of CR and its environmental behavior was measured. Results showed that the CR derived from carton exhibited notable efficacy in adsorbing Cd 2+ (56.111 mg/g), pesticides and PO 4 3− (0.231 mmol/g), thereby mitigating pollutants and immobilizing nutrient in soil environment. The introduction of PVC was found to enhance the adsorption of CR for Cd 2+ (65.623 mg/g) and PO 4 3− (0.524 mmol/g), albeit exhibiting diminished performance in the removal of pesticides. Different from previous studies, this study revealed that the dissolved black carbon (DBC) released from CRs did not generate reactive oxygen species (ROS) effectively under solar irradiation, and the light screening of DBC can mitigate the photodegradation of pollutants. Furthermore, both CRs increased bacterial luminescence by approximately 70%, which indicated that no toxicity produced during the pyrolysis process. And gas chromatography-mass spectrometry (GC-MS) revealed the absence of polyaromatic hydrocarbon (PAH) in CRs. In summary, this study may provide some new insights on the disposal of MSW, and the CR made by MSW could be effective in soil amendment and reduce the leaching of pollutants and nutrient.
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PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Peng Cui,Tiantian Wang,Zihan Wang,Heshun Geng,Pengcheng Song,Fang Hu,Junhua You,Kai Zhu
The progress of rechargeable zinc (Zn) ion batteries (RZBs) has been significantly impeded by the occurrence of side reactions and dendritic issues on Zn anodes, which are attributed to the intricate reaction kinetics observed in aqueous electrolytes. Herein, we propose a co-solvent electrolyte comprising a combination of N, N-dimethylformamide (DMF) and Dimethyl sulfoxide (DMSO). This electrolyte reconstructs the surface of the Zn anode and generates a dense and robust solid electrolyte interface (SEI), which promotes uniform Zn 2+ deposition and enhances Zn 2+ transport kinetics. The DFT further shows that the electrolyte has a unique solvated structure which enables uniform Zn 2+ deposition and the creation of stable SEI. By utilizing these advantages, the co-solvent electrolyte is capable of enduring uninterrupted cycling for more than 4000 h at a current density of 1 mA cm −2 , and for over 2000 h at a current density of 5 mA cm −2 . Furthermore, the Zn||NH 4 V 4 O 10 full cell demonstrated exceptional electrochemical performance with regard to charge/discharge capacity and cycle stability. This study showcases the effectiveness of non-aqueous electrolytes, which will enable the progress of secure and high-capacity RZBs.
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Nano Materials Science
·
2024
·
IF 12.6
Qigang Li,Jianyun Ding,Youfang Zhang,Weiwei Lei,Zhaoyang Wei,Chao Chen,Dean Shi
Achieving high thermal conductivity in polymer composites with micro or nanoparticle fillers are challenging. Typically, over 50 vol% filler loading is necessary to form a thermal conductive network. However, even with such a network in place, the increase in thermal conductivity may not be significant compared to that in electrically conductive composites. To clarify the ideal filler network structure, we endeavored to selectively disperse nano-sized Al₂O₃ nanoparticles at the interface of co-continuous SEBS/PA6 blends, with and without various filler surface modification methods. A thermal conductive network forms when all interface areas are fully covered by 2.56 vol% of Al 2 O 3 nanoparticles (very close to theoretical loading content 2.29 vol%). In this case, the Al 2 O 3 nanoparticle has the highest thermal conductive contribution (TCC). However, the absolute TCC values are extremely low because of the interfacial thermal resistance and it will decrease when the filler content exceeds 2.56 vol%, indicating that some nanoparticles are dispersed separately out of the existed thermal conductive network. These findings suggest that the construction of a connected thermal conductive network, relatively lower interfacial thermal resistance and the precise positioning of fillers within this network are essential for achieving high thermal conductivity composites.
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CERAMICS INTERNATIONAL
·
2024
·
IF 5.1
Huabiao Tao,Yuyin Fang,Yuanpeng Zhang,Yuepin Zhang,Jianxu Hu
Optical temperature sensing based on luminescence intensity ratio shows significant potential in achieving accurate temperature detection. In this work, Sb 3+ /Mn 2+ co-doped Cs 2 NaYCl 6 double perovskites were synthesised via a hydrothermal method . Introducing Sb 3+ ions to the host significantly enhances the radiative recombination of self-trapped excitons (STEs), resulting in a broad blue emission. The co-doping of Mn 2+ ions to the composition leads to a tunable dual-emission in the spectra, originating from the energy transfer between the STEs and Mn 2+ ions. The dependence of the dual-emission on temperature is employed for optical temperature sensing. The maximum relative sensitivity, optimal thermal resolution, and optimal thermal repeatability are determined as 1.40 % K −1 , 0.002 K and 99.3% at 250 K, respectively. The results indicate that the synthesised Cs 2 NaYCl 6 : Sb 3+ /Mn 2+ double perovskites are promising candidates for high-sensitivity optical thermometers.
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2024
·
IF 4.9
Siyi Zhou,Hao Cheng,Sridhar Komarneni,Jianfeng Ma
In this study, a cobalt-doped nickel disulfide (Co-Ni 3 S 2 ) catalyst was prepared by a one-step hydrothermal method, which was grown on the surface of firm and dense three-dimensional porous nickel foam (NF). Although researchers have conducted extensive research on heterogeneous catalytic ozonation (HCO) over the past decades, the development of highly efficient, easily separable, stable, and recyclable HCO catalysts is still a bottleneck for practical applications. Taking p-nitrophenol (PNP) as the targeted pollutant, the synergistic effect of Co-Ni 3 S 2 /NF composites and ozone was studied. The results show that Co-Ni 3 S 2 /NF with different doping ratios can degrade PNP by more than 99% within 40 minutes, showing high activity. At the same time, in the cycle experiment, Co-Ni 3 S 2 /NF showed good stability and recyclability compared with the powder catalyst and therefore, the former could reduce water treatment cost. We also found that in the Co-Ni 3 S 2 /NF/O 3 system, the production rates of 1 O 2 , •OH and O 2 •- can be greatly improved, and the process of degradation is synergistic with both non-radicals and free radicals.
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CERAMICS INTERNATIONAL
·
2024
·
IF 5.1
Jing He,Xiao Yang,Zehui Zhu,Xue Luo,Cai-e Wu,Yan Cui,Qingzhi Ge,Jian Qiu,Leilei Xu,Mindong Chen
Cerium dioxide (CeO 2 ) supported palladium (Pd) catalysts have found widespread application in CO oxidation reaction owing to their exceptional catalytic performance. The morphology of the CeO 2 support dictates the exposed crystal plane, exerting a profound influence on surface structure and redox properties. This is crucial as the atomic arrangement at the surface directly impacts catalytic activity. In this study, a range of CeO 2 supports with diverse morphologies ( e.g. nano-octahedra, nano-cubes, nano-particles, nano-spheres, and nano-rods) were successfully synthesized through hydrothermal methods and subsequently supported with Pd for CO oxidation. The spherical 1Pd/CeO 2 –S catalyst, revealing exposed (111) + (100) crystal planes, exhibited significantly higher CO catalytic oxidation activity compared to the catalysts with other morphological CeO 2 supports. The results indicated a positive correlation between the content of Pd x Ce 1-x O 2-y species and catalytic activity. Notably, this species was most abundantly formed in the spherical 1Pd/CeO 2 –S catalyst with exposed (111) + (100) crystal planes. The presence of this active species facilitated the formation of surface defects , increased oxygen vacancy concentration, and enhanced metal-support interaction, consequently greatly improving the CO low-temperature catalytic oxidation activity. Consequently, the oxidation state of Pd in the Pd/CeO 2 catalyst could be effectively regulated by controlling the exposure of (111) + (100) crystalline surfaces of the CeO 2 support, further optimizing the catalytic performance of the Pd/CeO 2 catalytic system.
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CHEMICAL ENGINEERING JOURNAL
·
2025
·
IF 13.2
Dan Shao,Bo Zhang,Weipeng Zhao,Jiangtao Feng,Hao Xu,Chen Zhu,Wei Yan,Xiaohua Jia,Haojie Song
The newly developed “Joule heat assisting electrochemical degradation” strategy has been demonstrated as a green and cost-effective strategy for eliminating microplastics (MPs) in water. However, due to their high specific area and abundant surface functional groups, MPs also serve as the ideal carriers for other emerging contaminants in water, and their complexes pose more severe threats to the health of animals and humans. The present study aims to exploit the strong interactions between polystyrene (PS) MPs and four representative aromatic emerging contaminants, in order to potentially enhance the removal these aqueous contaminants through electrochemical co-degradation with PS MPs. Results indicate that PS promotes the degradation of p-benzoquinone or tetracycline, and vice versa. Methylene blue impedes PS degradation, but PS is beneficial to the degradation of methylene blue. Bisphenol A inhibits PS degradation, and vice versa. The different mechanisms were put forward based on universality examination towards more aromatic derivates, sufficient characterizations of pristine MPs and their residual solid and liquid samples, quenching experiment, and DFT calculations. Furthermore, toxicity analysis and techno-economic analysis were also carried out. This study establishes a solid basis for electrochemical co-degradation of MPs and other emerging contaminants in real water matrix in the future.
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JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2024
·Vol. 35
·期 25
·1-14
·
IF 2.8
Qian Wanqing,Xu Qingliang,Yu Xueqing,Hussain Fayaz,Chen Xinhua,Su Weitao,Sun Shikuan,Song Kaixin
To develop new luminescent materials for optical thermometers, a series of Er 3+ /Eu 3+ doped double perovskite La 2 MgSnO 6 phosphors are synthesized by a high-temperature solid-phase method. The structure, luminescence performance, energy transfer, and thermal sensitivity are systematically studied by X-ray diffraction (XRD), scanning electron microscopy fluorescence spectroscopy, lifetime decay curve, and temperature-dependent emission spectra. The prepared samples possess good coincidence with pure perovskite phase, and the refined high-quality XRD data reveal that Eu 3+ and Er 3+ jointly occupy La 3+ sites. which is attributed to the effective energy transfer from Er 3+ to Eu 3+ ions. By adjusting the doping concentration of Eu 3+ , the emission of Er 3+ is attenuated and the luminous color is modulated from green to orange-red. These demonstrate the existence of energy transfer between Er 3+ and Eu 3+ . In addition, the optimized La 2 MgSnO 6 : 0.075Er 3+ , 0.04Eu 3+ phosphor exhibits excellent thermal stability and good temperature cycling. The emission intensity showed good cycling in the process of repeated heating and cooling, and maintained to 76% of the initial temperature (303K) at 403K. Studied the optical temperature sensing performance of LMS: 0.075Er 3+ , 0.04Eu 3+ fluorescent powder. The results of fitting the fluorescence intensity ratio with the non-thermal coupling characteristic peaks of 555 and 706nm showed excellent optical sensitivity, and the S a and S r were calculated as 0.0029K −1 and 1.21%K −1 , respectively. All results indicate that LMS: 0.075Er 3+ , 0.04Eu 3+ phosphors could have potential applications for non-contact optical temperature measurement materials.
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MINERALS ENGINEERING
·
2024
·
IF 4.9
Jingyi Hao,Binchuan Li,Jing Dai,Daxue Fu,Yongfeng Chang,Jianshe Chen,Na Xu,Kuiren Liu,Qing Han
The strongly alkaline sodium aluminate solution generated from high-sulfur bauxites during their refinement through the Bayer process contains sulfur, mainly in the form of thiosulfate (S 2 O 3 2− ) ions, which affects the quality of the target product (alumina). Consequently, the large-scale use of high-sulfur bauxites is severely limited, and methods of desulfurizing sodium aluminate solutions are urgently needed. To address this need, we herein prepared metal–organic framework (ZIF-8)-supported Co-doped TiO 2 (Co-TiO 2 @ZIF-8) using a sol–gel method and low-temperature calcination under N 2 and examined the ability of this composite to photocatalyze the oxidative degradation of thiosulfate ions in sodium aluminate solutions. Co-TiO 2 @ZIF-8 retained the large specific surface area and rich porosity of ZIF-8, which reduced the agglomeration of TiO 2 particles on the surface. The loading of Co-TiO 2 endowed Co-TiO 2 @ZIF-8 with a mesoporous structure and thus increased its adsorption capacity. Compared with ZIF-8, Co-TiO 2 @ZIF-8 featured new functional groups, and the formation of Zn–C and N–Ti–O bonds confirmed the successful integration of Co-TiO 2 with the ZIF-8 carrier. Consequently, the thiosulfate removal rates by Co-TiO 2 @ZIF-8 were 42 % and 26 % higher than those observed for the blank sample and pure TiO 2 (light source = xenon arc lamp, oxidant = O 3 , reaction time = 60 min), respectively. This high performance is primarily due to Co doping, which enhanced the efficiency of visible light utilization, and the photogenerated electron–hole pairs on the photocatalyst surface and hydroxyl radicals formed by the interaction of holes with the solution-phase OH − ions.
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INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2024
·
IF 8.1
Kaihui Ma,Junyi Deng,Qinghui Wu,Peng Hu,Shuxing Qiu,Mao Chen,Jian Xu
Using clean energy in the ironmaking industry is expected to reduce the negative impacts on our environment. H 2 , one of the most important clean energies, has a great potential to partially replace CO in the blast furnace process, thus cutting down CO 2 emission. In order to unravel the distinct effects on the shrinkage behaviour between CO and H 2 , four binary- FeO-rich oxides and four ternary- FeO-rich oxides were employed to compare their performance under the simulated blast furnace cohesive zone conditions. The results show that the formed olivine and solid solution have the intention to dominate the shrinkage of packed bed below 900 °C, while the formed spinel compounds with higher melting point determine the shrinkage above 1300 °C. In comparison to CO, H 2 has a faster gaseous reduction rate. Therefore, the higher quantity of reduced iron and less disintegration of coke in the packed bed simultaneously suppresses the shrinkage between 900 °C and 1000 °C. Besides, the much slower iron carbonization rate in H 2 postpones the re-accelerating of shrinkage as a result of melting and dripping to higher temperatures.
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危险品化学品经营许可证（带存储）