RSC Advances
·
2023
·Vol. 13
·期 25
·17362-17369
·
IF 3.9
Zhe Zhang,Fanhao Kong,Bizhen Yuan,Yinnian Liao,Xiue Ren,Yu Hou
Solar-driven CO2 reduction into fuels and sustainable energy has attracted increasing attention around the world. However, the photoreduction efficiency remains low due to the low efficiency of separation of electron–hole pairs and high thermal stability of CO2. In this work, we prepared a CdO decorated CdS nanorod for visible light driven CO2 reduction. The introduction of CdO facilitates the photoinduced charge carrier separation and transfer and acts as an active site for adsorption and activation of CO2 molecules. Compared with pristine CdS, CdO/CdS exhibits a nearly 5-fold higher CO generation rate (1.26 mmol g−1 h−1). In situ FT-IR experiments indicated that CO2 reduction on CdO/CdS may follow a COOH* pathway. This study reports the pivotal effect of CdO on photogenerated carrier transfer in photocatalysis and on CO2 adsorption, which provides a facile way to enhance photocatalytic efficiency.
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npj Clean Water
·
2023
·Vol. 6
·期 1
·1-11
·
IF 11.4
Li Chao,Li Jiale,Huang Niu,Kong Xin Ying,Xiao Qingyi,Huang Yingping,Wong Po Keung,Ye Liqun
Advanced oxidation technology based on peroxonosulfate (PMS) has attracted extensive attention in water treatment research due to its fast reaction speed and wide pH range adaptability. Cobalt-based catalysts are considered to be one of the most effective reagents for PMS activation in various PMS activation methods. However, Co-ion leaching and difficulty in recovery have greatly hindered its practical applications. Herein, we developed a robust membrane constructed by nitrogen-doped carbon nanotubes embedded with cobalt nanoparticles (Co-NC) to concurrently address the Co-ion leaching and recovery issues. Based on our customization, continuous water flow reactor, the Co-NC membrane exhibited excellent catalytic activity and stability, in which it demonstrated a remarkable sterilization efficiency of 99.9999% against E. coli , and it retained a superior stability of 96.29% after 40 repeated cycles. Fewer attempts to put such efficient heterogeneous advanced oxidation processes (AOPs) into practical application, to mimic real-life applications, the performance of the Co-NC/PMS system was extended to the water taken from Qiuxi River. Remarkably, there is no deterioration in performance over 12 h of continuous real sewage processing. Mechanistic studies revealed that abundant high-valence metals (Co IV =O) were generated in the system, which can attack and penetrate into the cell membrane to destroy its intracellular defense system. This work provides useful insights into designing robust membranes with superior efficiency and stability for PMS-based advanced oxidation technology.
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Small
·
2023
·Vol. 19
·期 39
·2302530
·
IF 13.3
Xiaotong Li,Minkai Qin,Xiuju Wu,Xiangzhou Lv,Jianghao Wang,Yong Wang,Hao Bin Wu
Electrochemical CO 2 reduction reaction (CO 2 RR) is a promising strategy for waste CO 2 utilization and intermittent electricity storage. Herein, it is reported that bimetallic Cu/Pd catalysts with enhanced *CO affinity show a promoted CO 2 RR performance for multi-carbon (C2+) production under industry-relevant high current density. Especially, bimetallic Cu/Pd-1% catalyst shows an outstanding CO 2 -to-C2+ conversion with 66.2% in Faradaic efficiency (FE) and 463.2 mA cm −2 in partial current density. An increment in the FE ratios of C2+ products to CO for Cu/Pd-1% catalyst further illuminates a preferable C2+ production. In situ Raman spectra reveal that the atop-bounded CO is dominated by low-frequency band CO on Cu/Pd-1% that leads to C2+ products on bimetallic catalysts, in contrast to the majority of high-frequency band CO on Cu that favors the formation of CO. Density function theory calculation confirms that bimetallic Cu/Pd catalyst enhances the *CO adsorption and reduces the Gibbs free energy of the C C coupling process, thereby favoring the formation of C2+ products.
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Nano Energy
·
2023
·
IF 17.6
Jiaqi Zhao,Zhenhua Li,Pu Wang,Peng Miao,Run Shi,Geoffrey I.N. Waterhouse,Tierui Zhang
CO photo-hydrogenation is currently attracting a lot of interest as a low energy input technology for the sustainable production of olefins . Herein, a novel photo-driven Fischer-Tropsch to olefins (FTO) catalyst was synthesized by physical mixing a layered-double-hydroxide-derived cobalt catalyst (LD-Co) with a hydrophobic polydivinylbenzene (PDVB). The obtained LD-Co/PDVB catalyst synergistically harnessed the photothermal and catalytic properties of LD-Co with the hydrophobic properties of PDVB to deliver outstanding photothermal FTO performance. Under ultraviolet-visible irradiation, hydrophobic LD-Co/PDVB delivered a higher CO photo-hydrogenation activity than hydrophilic LD-Co, together with a high olefin selectivity (42.72%−50.49%) and greatly suppressed CO 2 selectivity (2.89%−11.50%) compared to LD-Co (12.65%−30.61%) at 180–195 °C. Water vapor adsorption-desorption experiments and water-gas shift (WGS) reaction tests revealed that the hydrophobic modification acted to suppress the WGS reaction, thereby boosting the olefin production and suppressing CO 2 selectivity. The findings demonstrated that a simple hydrophobic modification can be used to regulate the activity and selectivity of catalysts for photothermal FTO reactions, opening new vistas towards improved photo-driven olefin production.
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International Journal of Environmental Research and Public Health
·
2023
·Vol. 20
·期 6
·4902
·
IF 4.614
Ruiqi Wu,Ning Liu,Chengna Dai,Ruinian Xu,Ning Wang,Gangqiang Yu,Biaohua Chen
N2O is a greenhouse gas and a candidate oxidant. Volatile organic pollutants (VOCs) have caused great harm to the atmospheric ecological environment. Developing the technique utilizing N2O as the oxidant to oxidize VOCs to realize the collaborative purification has significant importance and practical value for N2O emission control and VOC abatement. Therefore, the study of N2O catalytic oxidation of tert-butanol based on zeolite catalysts was carried out. A series of molecular sieves, including FER, MOR, ZSM-5, Y, and BEA, were selected as the catalyst objects, and the 1.5% wt Fe and Co were, respectively, loaded on the zeolite catalysts via the impregnation method. It was found that the catalytic performance of BEA was the best among the molecular sieves. Comparing the catalytic performance of Fe-BEA under different load gradients (0.25~2%), it was found that 1.5% Fe-BEA possessed the best catalytic activity. A series of characterization methods showed that Fe3+content in 1.5% Fe-BEA was the highest, and more active sites formed to promote the catalytic reaction. The α-O in the reaction eventually oxidized tert-butanol to CO2over the active site. The Co mainly existed in the form of Co2+cations over Co-BEA samples; the 2% Co-BEA possessing higher amounts of Co2+exhibited the highest activity among the prepared Co-BEA samples.
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JOURNAL OF MOLECULAR LIQUIDS
·
2023
·
IF 6
Xueying Zhang,Junyan Wang,Xincheng Zhang,Lin He,Hong Sui,Xingang Li
The fine mineral particles often coexist in oil-water emulsions, enhancing the stability of oil-water emulsions. Herein, the micro SiO 2 was used to investigate its synergistic effects with the interfacially-active asphaltenes (IAA) on forming the strong interfacial film at the oil–water interface. This IAA-particle film showed high rigidity, allowing the emulsion droplets (4 μm − 20 μm) to be much more stable than the traditional asphaltene-stabilized emulsions. With the addition of the oxygen containing demulsifier (MJTJU-2, an alternated aliphatic alcohol nonionic polyether), this kind of emulsion could be broken significantly (over 99 % at the demulsifier concentration > 600 ppm and settling time > 45 min) with almost all of the microparticles transferring from oil phase to the water phase as particle net-like film. The optimal concentration (1000 ppm) of demulsifier were obtained. Further mechanistic study by QCM-D suggested that the desorption process of asphaltenes from solid surface could be divided into three main stages: the demulsifier molecules adsorbed and penetrated into the IAA adsorption film on solid surface; the simultaneous desorption of the adsorbed IAA and pre-adsorbed demulsifiers; the IAA film became loose and was destructed by the demulsifiers. AFM tests found that after addition of demulsifiers, the surface force between IAA and silica (0.0589 mN/m) decreased about 37 %. The MD simulation results showed that the demulsifier molecules would adsorb on the IAA film firstly by van der Waals and hydrogen bond, making the film much looser. The demulsifier could interact with the IAA molecule, resulting in desorption of IAA. Simultaneously, the demulsifier could compete for the adsorption sites on the IAA molecules by forming new hydrogen bonds, which destroyed the IAA adsorption layer. As a result, the stable IAA-solid film at oil–water interface could be broken. These findings would provide fundamental understanding to the stability and instability of IAA-solids co-stabilized oil–water emulsions, oil-sludge treatments.
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Nano Today
·
2023
·
IF 17.4
Xi Liu,Xizi Wan,Lianxin Shi,Bing Dai,Man Yang,Xuetao Xu,Wuyi Xiao,Xiao He,Lei Jiang,Shutao Wang
Developing omni-adhesives is a great challenge for those oil/water wetted substrates because the interfacial liquid always restricts the contact area between adhesives and substrates. Herein, we report omni-adhesive fibers composed of oilborne core-fiber and waterborne semi-nanoshell via Taylor-cone co-electrospinning, realizing efficient adhesion on diverse liquid wetted substrates with cold tolerance. The oilborne core-fiber and waterborne semi-nanoshell enable the omni-adhesive fibers to adhere onto solid substrates wetted by diverse liquids, such as aqueous solutions with acid, base and salts, organic solvents and daily drinks, through a partial dissolving-wetting-adhering process. Further, the formed nano-adhesive layer of omni-adhesive fibers shows wide-range temperature tolerance from −196–60 ℃. As a proof-of-concept study, we demonstrate a temperature monitor based on omni-adhesive fibers can indicate the temperature fluctuation of cold-supply chain, such as vaccine transport. This study provides a feasible route to design omni-adhesives adaptive to complex liquid wetted substrates in large temperature fluctuations.
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Materials
·
2023
·Vol. 16
·期 2
·503
·
IF 3.4
Binxiao Wei,Chen Yu,Yongping Bai,Li Liu,Jinmei He
As the requirements of aerospace technology become more rigorous, the performance of solid rocket motor (SRM) cases needs to be further optimized. In the present study, a co-curing technique was used to fabricate carbon fiber reinforced polymer (CFRP)/ethylene-propylene-diene monomer (EPDM) composites whereby the properties of CFRP/EPDM composites were adjusted by varying the temperature, heating time and type of vulcanizing agent to obtain the optimum manufacturing process. The results of crosslink density (3.459 × 10−4mol/cm3) tested by nuclear magnetic resonance (NMR), a 90° peel strength test (2.342 N/mm), and an interlaminar shear test (ILSS = 82.08 MPa) demonstrated that the optimum mechanical properties of composites were obtained under the temperature 160 °C heated for 20 min with the curing agent DCP/S. The interfacial phase and bonding mechanism of composites were investigated by scanning electron microscopy (SEM). Thermogravimetric analysis (TGA) further indicated that EPDM/DCP/S had favorable thermal stability. This will provide valuable recommendations for the optimization of the SRM shell preparation process.Keywords:carbon fiber reinforced polymer;epdm;co-curing;preparation optimization
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CERAMICS INTERNATIONAL
·
2022
·
IF 5.532
Ming Yan,Jiangtao Huang,Mengliu Yang,Hao Zhang,Yu Zhu,Nengyu Zhou,Juan Wang
MAX phases are layered ternary carbides and nitrides with unique properties, doping transition metals in it is attracting significant attentions for the processing of this relatively new class of materials. In this paper, a magnetic solid solution MAX phase V 2 (Sn 1− x A x )C ( A = Mn, Fe, Co) was synthesized by doping Mn/Fe/Co atoms into V 2 SnC by pressure-less sintering. The XRD results show that when x = 0.4, the characteristic peak shifts to the right, and the substitution reaches saturation. SEM and TEM show that doping does not change the original layered morphology and hexagonal crystal form, but only the lattice constants decrease slightly. Magnetic test results indicate that V 2 (Sn 1− x A x )C is a typical low-temperature magnetic material with a Curie temperature around 60 K, and the magnetization increases with the increase of doping amount. Moreover, we explained the reasons of V 2 SnC doping A-site instead of M-site and the changing trend of the magnetic moments by first-principles calculations, which are consistent with the experimental results.
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BULLETIN OF ENVIRONMENTAL CONTAMINATION AND TOXICOLOGY
·
2022
·Vol. 110
·期 1
·1-7
·
IF 2.807
Gu Xinfeng,Mo Huijing,Wang Lei,Zhang Lianyi,Ding Zhuhong
Transport of Cr(VI) at the presence of bentonite colloid was carried out in saturated porous media of 16–18 mesh and 40–60 mesh sand columns. Effects of flow rate, pH, ion strength, humic acid and bentonite concentrations on Cr(VI) migration were investigated. The results show that the increase of flow rate accelerated the breakthrough of Cr(VI) and BP, but the transport mass of dissolved Cr(VI) decreased by ~ 15.0% when flow rate increased to 2.5 ml min −1 . Increasing IS to 10mM resulted in decrease of Cr(VI) transport mass by 6.86%–21.4%. Increase of pH and decrease of bentonite concentration favored the transport of dissolved Cr(VI). Humic acid had little effect on transport amount of Cr at pH7. Cr(VI) transport was dominated by the dissolved Cr(VI). The transport data of dissolved Cr(VI) were well described by the two-site model. The presence of BP reduced total Cr(VI) transport mass in co-transport.
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MICROCHEMICAL JOURNAL
·
2018
·
IF 2.746
Bingru Liu,Xiaohua Li,Sumin Liu,Xu Hun
In this work, a chemiluminescence (CL) aptasensor was designed for detection of microcystin-RR (MC-RR) by introducing Cu/Co nanorods acting as CL catalyzer. Cu/Co nanorods were firstly synthesized throughout a hydrothermal method . Then the thiolated MC-RR aptamer was immobilized on the surface of Cu/Co nanorods, which was employed for recognizing of MC-RR target. In the presence of MC-RR, the conformational change of MC-RR aptamer was happened via recognizing between MC-RR and its aptamer. The luminol CL was catalyzed by Cu/Co nanorods that influenced by conformational change of MC-RR aptamer. The formed MC-RR/aptamer composite prevented the diffusion channel of luminol substrate toward the Cu/Co nanorods surface and restrained the Cu/Co nanorods catalyzing luminol CL. And the intensity of CL depended on the concentration of MC-RR. Under optimal condition, the CL aptasensor had a linear range in 0.1 to 70 nM and a low detection limit of 3.3 × 10 −11 M for MC-RR. This study provided a significant method for MC-RR detection in real samples with excellent selectivity.
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JOURNAL OF FOOD SCIENCE
·
2018
·Vol. 84
·期 1
·111-120
·
IF 2.018
Weijun Chen,Mingming Zou,Xiaobin Ma,Ruiling Lv,Tian Ding,Donghong Liu
Although different delivery systems have been developed to overcome the limits of Epigallocatechin-3-gallate (EGCG) and quercetin in food application, none have referred to their simultaneous encapsulation. In this study, these two polyphenols were successfully co-loaded into liposomes. Under the optimal conditions (lecithin-total polyphenols ratio 25:1, lecithin-cholesterol ratio 6:1, lecithin-Tween 80 ratio 8:1 and ultrasonic time 2 min), the mean size, polydispersity index (PDI) and zeta potential of liposomes were 111.10 ± 0.52 nm, 0.259 ± 0.006 and –19.83 ± 0.45 mV, with an encapsulation efficiency of 64.05 ± 1.56% and 61.73 ± 2.55% for EGCG and quercetin, respectively. After 30-day storage, an increase of 4.05% was observed in the mean size with no significant change ( P ≥ 0.05) in the PDI and zeta potential. Moreover, 2,2-diphenyl-1-picrylhydrazyl (DPPH) assay revealed a synergistic antioxidant effect of the two compounds in liposomal system. These results demonstrated that co-encapsulation of EGCG and quercetin enhances their effectiveness. Practical Application EGCG and quercetin are natural polyphenols abound in the human diet with diverse biological activities. These two polyphenols were successfully co-encapsulated into a homogeneous and stable liposomal system. Interestingly, a synergistic antioxidant effect of the two polyphenols was observed due to co-encapsulation. This indicated that the simultaneous delivery of EGCG and quercetin was an attractive approach to improve their functionality for expanding their application in food, cosmetic and pharmaceutical industries.
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