INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2025
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IF 3.9
Chen Xue,Libin Liu,Yuxi Si,Yangqiang Huang,Shengdong Yang,Kuanrong Xue,Jun Xi,Youwei Cheng
The direct esterification reaction of CO2 with methanol to produce dimethyl carbonate (DMC) provides a sustainable pathway for the resourceful utilization of CO2. However, the chemical stability of CO2 makes the reaction kinetically difficult with low methanol conversion and DMC yields. In this study, a series of catalysts (denoted as M-CeO2, M = Fe, Cu, Co, La, Zr, Ni, and Al) with oxygen vacancy defects were constructed by a doping strategy, which provided critical sites for the adsorption and activation of methanol and CO2. Additionally, 2-cyanopyridine (2-CP) was employed as a dehydrating agent to facilitate the esterification reaction through dehydration. Under the optimized experimental conditions, the conversion of methanol was 61.9% and the DMC yield was 61.6%. The experimental and characterization results show that the extensive oxygen vacancies and base sites on the surface of the 5% Co-CeO2 catalyst are crucial for activating methanol and CO2, which is the main reason for the high catalytic activity of the catalyst. In situ diffuse reflectance infrared Fourier transform spectroscopy (DRIFTS) effectively demonstrated the efficient activation of methanol and CO2 on the catalyst and further confirmed the formation of monomethyl carbonate species during the reaction process. The high catalytic performance was also demonstrated in the direct esterification of other monohydric alcohols, thus confirming the broad applicability of the catalyst. This study presents a viable approach for the efficient utilization of CO2 resources, offering a promising solution for the sustainable management of greenhouse gas.
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Advanced Optical Materials
·
2024
·
IF 8
Ruiqi Shi,Shihai Miao,Xulong Lv,Dongxun Chen,Yi Zhang,Yanjie Liang
The utilization of phosphor-converted light-emitting diodes (pc-LEDs) as compact short-wave infrared (SWIR) emitters has emerged as a promising strategy for miniature SWIR spectrometers in portable devices, enabling diverse applications such as nondestructive identification, bioimaging, night-vision surveillance, and optical communication. However, discovering phosphors capable of efficiently absorbing blue light and emitting pure SWIR light (>900 nm) remains a significant challenge. Here, highly efficient and thermally stable SWIR luminescence of Yb 3+ upon blue LED excitation by employing Cr 3+ –Yb 3+ energy transfer in Y 3 Ga 5 O 12 garnet is reported. The prepared Y 3 Ga 5 O 12 :Cr 3+ ,Yb 3+ phosphor exhibits intense SWIR emission spanning from 900 to 1150 nm at 438 nm excitation, coupled with ultra-high internal/external quantum efficiency of 80.8%/40.2% and excellent luminescence thermal stability (108%@150 °C). A SWIR pc-LED prototype fabricated by incorporating the optimized phosphor with a commercial 450 nm blue LED chip, shows exceptional SWIR luminescence performance, delivering a SWIR output power of 92.7 mW at a driving current of 350 mA and a photoelectric efficiency of 21.5% at 10 mA. This work opens up a new avenue for designing SWIR phosphors that exhibit efficient and thermally stable photoluminescence with blue LED excitation, demonstrating significant potential for next-generation high-power compact SWIR light sources.
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InfoMat
·
2024
·
IF 22.7
Hongwei Zhou,Ying Lin,Yongzhen Ma,Luyao Han,Zhixin Cai,Yan Cheng,Qibin Yuan,Wenhuan Huang,Haibo Yang,Renchao Che
Developing intelligent electromagnetic wave (EMW) absorption materials with real-time response-ability is of great significance in complex application environments. Herein, highly compressible Fe@CNFs@Co/C elastic aerogels were assembled through the electrospinning method, achieving EMW absorption through pressure changes. By varying the pressure, the effective absorption bandwidth (EAB) of Fe@CNFs@Co/C elastic aerogels shows continuous changes from low frequency to high frequency. The EAB of Fe@CNFs@Co/C elastic aerogels is 14.4 GHz (3.36–17.76 GHz), which covers 90% of the range of S/C/X/Ku bands. The theoretical simulation indicates that the external pressure prompts a reduction in the spacing between the fiber layers in the aerogels and facilitates the formation of a 3D conductive network with enhanced attenuation ability of EMW. The uniform distribution of metal particles and appropriate layer spacing can effectively optimize the impedance matching to achieve the best EMW absorption performance. This work state clearly that the hierarchically assembled elastic aerogels composed of metal–organic frameworks (MOFs) derivatives and carbon fibers are ideal dynamic EMW absorption materials for intelligent EMW response.
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Journal of Environmental Chemical Engineering
·
2024
·
IF 7.4
Kang Li,Chenxi Li,Yisa Liu,Jiong Dong,Lili Xu,Yanran Li,Ruixin Ma,Shina Li
The widespread application of nuclear energy has increased the risk of contamination by radionuclide 137 Cs. Prussian blue analogues are considered to be excellent materials for the removal of 137 Cs from wastewater due to their unique structure. In this work, Cs + adsorbent for PBAs with Fe-Co framework, potassium iron hexacyanocobaltate (PBA Fe ), was synthesized by room temperature precipitation method. Systematic structural characterization and performance results of PBA Fe showed that it has a specific surface area of 452.8 m 2 /g and an average pore size of 8.6 nm, providing more active sites for Cs + . The adsorption of Cs + on PBA Fe exhibited fast reaction kinetics (within 10 min) and high adsorption capacity (82.90 mg/g), and the removal rate of Cs + reached 98.57 %. The efficient removal of Cs + by PBA Fe in various real water environments showed its excellent selectivity and potential for practical application. In addition, adsorption mechanism studies showed that the adsorption of Cs + was achieved by ion exchange with K + in the PBA Fe lattice. PBA Fe has the advantages of simple synthesis and good selectivity, and has potential application in the harmless treatment of Cs + in radioactive wastewater.
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ACS Applied Polymer Materials
·
2024
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IF 4.4
Junhua Ding,Li Zhang,Yingke Zhu,Jinggang Wang,Zhenghong Guo,Zhengping Fang,Juan Li
A flame retardant containing two phosphonate structures (DOPO–DP) was synthesized by applying diphenylphosphinic chloride and 10-(2,5-dihydroxyphenyl)-10-hydro-9-oxa-10-phosphazephenanthrene-10-oxide. The DOPO–DP was used to modify the flame retardancy of poly(ethylene 2,5-furandicarboxylate-co-ethylene terephthalate) containing (PEFT). DOPO–DP has a high flame-retardant efficiency in PEFT. The UL-94 V0 level is obtained by adding 7 wt % DOPO–DP into PEFT. The fire-retardant mode of action is melting away, which is induced by the plasticizing effect of DOPO–DP mainly. In addition, two chain extenders triglycidyl isocyanurate (TGIC) and 2,2′-(1,3-phenylene)-dioxazoline were applied to enhance the mechanical properties of PEFT. DOPO–DP deteriorates the mechanical properties of PEFT while coupling agents improve the bending and impact strength. While the chain expansion effect of TGIC competes with the plasticizing effect of DOPO–DP, excessive TGIC deteriorates the UL-94 rating of PEFT.
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Polymers
·
2024
·Vol. 16
·期 9
·1239
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IF 4.7
Cong Yin,Yang Luo,Ting Pan,Liting Ding,Chenghuang Wang,Guoyuan Yuan,Chongxiong Duan
Recovering cobalt from waste batteries is crucial for resource recycling and environmental protection. Here, MOF-OH, a Zr-based MOF, was synthesized and merged into a polyacrylonitrile (PAN) matrix to create MOF-OH-PAN nanofibers (NFs). These NFs showed a high cobalt ion adsorption capacity of 33.1 mg/g, retaining over 90% of the capacity after six cycles. The adsorption mechanism involves Co(II) surface diffusion followed by strong bonding with functional groups. This technology enables efficient cobalt recovery from waste batteries, supporting reuse and reducing resource depletion and environmental pollution. The study provides insights into waste battery resource management, highlighting environmental and economic benefits and contributing to green resource recovery and circular economy initiatives.
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PubMed
高影响因子
MICROCHEMICAL JOURNAL
·
2024
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IF 4.9
Ping Wang,Qiulian Chen,Chengxin Xiang,Guonian Zhu,Yue Luo,Kerage Dorothy Mokeira,Yong Chen,Jialun Wu,Xiaoling Hou,Shuxia Xu
Tetrachlorobenzoquinone (TCBQ) as one of the most toxic quinones has potential risk of causing canceration, and the monitoring of TCBQ in the environment is of significant importance. In this study, a flowerlike Co-PTA-400(Ar) metal organic frameworks (MOF) catalyzed TCBQ-H 2 O 2 chemiluminescence (CL) system was established for sensitive determination of trace TCBQ in environmental waters. The reaction between TCBQ and H 2 O 2 can result in weak CL emission, and the CL signal was enhanced about 10-fold using flowerlike Co-PTA-400(Ar) as catalyst. The luminescence mechanism was investigated through kinetic studies and free radical scavenging experiments. The strong CL emission of TCBQ mainly relied on the generation of abundant •OH by the catalysis of Co-PTA-400(Ar). This strategy allows to develop a highly sensitive method for the determination of TCBQ in the linear range of 1 ∼ 50 μM, with a detection limit of 0.56 μM (3 σ ). The proposed method was applied for analysis of three spiked water samples with recoveries ranging from 95.7% to 100.5%. This method offering the advantages of rapid analysis, low costs, and high sensitivity, is appealing for detection of TCBQ in environmental waters.
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Molecular Catalysis
·
2024
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IF 3.9
Mingzhen Huang,Jinxin He,Kaiji Xu,Dongren Cai,Guowu Zhan
The supported Pt/CeO 2 catalysts are widely used for the catalytic oxidation of CO at ambient conditions. Herein, we reported a new strategy for modifying the interaction between Pt and CeO 2 support via pulsed steam treatment, which significantly optimized the catalytic performance of Pt/CeO 2 for CO oxidation. Specifically, the hollow CeO 2 nanospheres were prepared by using carbon spheres as sacrificial templates and then subjected to pulsed steam treatment at 150 °C for different times to obtain the CeO 2 -xH support (x means the time of pulsed steam treatment, min). It was found that the complete oxidation of CO can be achieved at 90 °C over the Pt/CeO 2 –50H sample, which was much lower than that (130 °C) on Pt/CeO 2 without pulsed steam treatment. The XPS and in-situ DRIFTS characterizations were conducted to reveal the high performance of the Pt/CeO 2 –50H catalyst for CO oxidation. It was found that the valence state of Pt significantly controlled by pulsed steam treatment was critical to the catalytic activity, whereby the presence of two types of active sites (Pt 0 -CO and Pt δ+ -CO) over Pt/CeO 2 –50H greatly promoted the combination of adsorbed CO and O 2 to generate CO 2 . Accordingly, this study provides a facile method to regulate the Pt valence state by pulsed steam treatment for CeO 2 support, which is critical to the CO oxidation activity.
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JOURNAL OF ANALYTICAL AND APPLIED PYROLYSIS
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2024
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IF 5.8
Kai Wu,Bingbing Luo,Qi Cao,Ke Yang,Siyu Wang,Huiyan Zhang
The selective hydrodeoxygenation of lignin-derived compounds is an effective pathway for producing liquid fuels. Here, a series of Co-based catalysts were prepared for converting lignin-derived phenols into alkane fuels. The effects of cobalt loading, Si/Al ratio, reaction temperature, time, and pressure on the distributions of alkane fuels were systematically investigated. The experimental results demonstrated that the in-situ grown LDH structure in Co/HZ-HT significantly improved the pore structure of the catalyst, not only enhancing the dispersion of the metallic particles and overall stability but also strengthening the interaction between the metal and the support. The complete conversion of guaiacol was achieved, and the selectivity of cyclohexane reached 97.5% under the conditions of 200 °C, 2 h, 3 MPa H 2 , and Si/Al ratio of 25. Co/HZ-HT exhibits excellent hydrogenolysis performance and wide applicability, outperforming Co/HZ catalysts prepared using conventional impregnation methods. By extending the feedstock to lignin-derived compounds, the complete deoxygenation of the components and hydrogenation of the aromatic rings were both realized with minimal side reactions.
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ACS Applied Nano Materials
·
2024
·
IF 5.3
Ruijuan Wang,Chunliu Ma,Haitao Yan,Hailiang Zhao,Pu Wang,Shoubing Zhang,Jianwei Ju,Shuyan Yu,Zhigang Yin
Co-encapsulated hydrophilic vitamin C (Vc) and hydrophobic xanthoxylin (GX-50) liposomes (L-Vc-GX-50) were prepared using ethanol injection and ultrasonic methods and characterized by dynamical light scattering, ζ-potential, cryogenic transmission electron microscopy, UV–vis spectroscopy, Fourier transform infrared spectroscopy, antioxidant capacity, tyrosinase activity, and in vitro permeation measurements. L-Vc-GX-50 are formed by the assembly of egg yolk lecithin, cholesterol, and tween 80, with Vc and GX-50 encapsulated in their hydrophilic and hydrophobic cavities, respectively. By considering the hydrodynamic radius (Rh), ζ-potential, and encapsulation efficiency (EE) of L-Vc-GX-50, the optimum formulation was determined to be egg yolk lecithin/cholesterol/tween 80/GX-50 or Vc (15:3:3:1, w/w) with phosphate buffer (pH 6.8, 0.01 M). The as-prepared L-Vc-GX-50 have an average Rh of 114 nm, a negative ζ-potential (−23.63 mV), a high EE of Vc (73.3%) and GX-50 (87.4%), and a unilamellar vesicle structure. Compared co-encapsulated L-Vc-GX-50 with single encapsulated Vc or GX-50 liposomes (L-Vc or L-GX-50), the EE of Vc in L-Vc-GX-50 is obviously higher than that of L-Vc, while the EE of GX-50 in L-Vc-GX-50 is similar to that in L-GX-50; the antioxidant capacity and tyrosinase inhibition activity of L-Vc-GX-50 are higher than those of L-GX-50 or L-Vc. The in vitro permeation data indicate that the final cumulative permeation amount of Vc and GX-50 in L-Vc-GX-50 can reach around 2.1 and 1.3 mg/cm2, respectively. The release kinetics fitting data show that the release kinetics of L-Vc-GX-50 follows the Korsmeyer–Peppas model and that the release of active ingredients is mainly dominated by the synergistic effect of diffusion release and rupture release. Moreover, L-Vc-GX-50 has good low-temperature storage stability, and the storage stability of GX-50 in L-Vc-GX-50 is significantly improved compared to L-GX-50. The main objective of this study is to improve the instability of Vc and the insolubility of GX-50 in cosmetics.
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JOURNAL OF ALLOYS AND COMPOUNDS
·
2024
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IF 5.8
Boyang Zhang,Gesong Huang,Wenjie Huang,Xiaola Li,Wenzhao Huang,Ziyang Liang,Yuqing Liu,Chenyu Liu,Zhan Lin,Dong Luo
Undesirable interfacial reactions and the resulting capacity degradation hinder the widespread application of lithium-rich layered oxide (LLO) as a cathode in high-energy lithium-ion batteries. Herein, a method to suppress the interfacial reactions of LLO is devised by treating the carbonate precursor with weak-base salts to induce elemental segregation and promote particle growth, by which a rock-salt structure is in-situ constructed on the particle surface. This rock-salt structure is in excellent lattice alignment with the internal structure, which is conducive to enhancing surface structural stability and suppressing interfacial reactions. As a result, the two treated samples deliver a capacity retention ratio larger than 93.9 % after 200 cycles, with much superior voltage and capacity stability than the untreated sample. This in-situ construction method is beneficial for developing advanced LLO cathodes.
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JOURNAL OF THE ENERGY INSTITUTE
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2024
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IF 5.6
Zhangjun Huang,Ziqi Tang,Hong Tian,Linli Shang,Xuan Huang,Lei Liu,Yanni Xuan
s: Nitrogen-containing compounds become a bottleneck in the conversion of biomass pyrolysis oil into high-value chemicals and fuels, and they are easily oxidized to nitrogen oxides in the subsequent utilization process, causing serious pollution to the environment. Lignin, a biomass component, has an important influence on nitrogen migration during biomass pyrolysis. In this study, we investigated the interaction of lignin model compounds (vanillin and Syringol) with nitrogen-containing components (phenylalanine) during lignin/amino acid co-pyrolysis using tube furnace experiments, thermogravimetric infrared (TG-FTIR) experiments, and gas chromatography-mass spectrometry (Py-GC/MS), as well as the effect of lignin on the pyrolysis gas release and pyrolysis products of phenylalanine, in conjunction with quantum chemical calculation The effect of lignin on the pyrolysis of phenylalanine to styrene was explored. The experimental results showed that during the co-pyrolysis process, lignin modulators (vanillin and Syringol) dramatically reduced the temperature of the first stage of phenylalanine pyrolysis; promoted the pyrolysis oil generation and inhibited the pyrolysis gas generation; vanillin and Syringol promoted the fracture of oxygen-containing and nitrogen-containing functional groups of the side chain of phenylalanine, which resulted in a significant increase in the yields of aromatic hydrocarbons in the pyrolysis oils, with an increase of 32.07 % and 23.41 %, respectively. The simulation results showed that the hydrogen radicals generated by lignin modulators would promote the carbon ring breakage, decarboxylation and intermolecular ring-forming reaction of phenylalanine side chain to generate 1,2-diphenylethene, styrene and NH 3 , and promote the nitrogen-containing carbon chain to undergo intramolecular hydrogen transfer to form HCN, which was converted into styrene pathway showing strong competitiveness.
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