FUEL
·
2022
·
IF 8.035
Haijian Qin,Huaibiao Wang,Qing Xia,Chunzhi Zheng,Xiaonan Zhang,You Wu,Lei Peng,Fengli Yang,Songjian Zhao
Small size cobalt nanoparticles are highly dispersed on different crystalline forms of Ta 2 O 5 (amorphous, T, M, H) by impregnation method, which is then introduced to catalytic oxidation of CO. The experimental results show that Co 3 O 4 /M-Ta 2 O 5 exhibits the highest CO conversion efficiency compared with Co 3 O 4 loaded on amorphous-, T-, and H-Ta 2 O 5 , and the pure Co 3 O 4 and M-Ta 2 O 5 . The temperature of 90 % CO conversion rate is approximately 170 °C at the high space velocity of 780,000 h −1 . Besides, the effect of oxygen concentration, space velocity, CO concentration, as well as different ratio of Co: Ta on CO conversion have been studied. Moreover, XRD , SEM, TGA , BET and H 2 -TPR characterizations reveal that Co 3 O 4 is uniformly distributed and does not change the structure crystalline of Ta 2 O 5 , and there is strong interaction between cobalt active component and Ta 2 O 5 support, which might be beneficial for CO conversion. Furthermore, the reaction mechanism has been investigated by X-ray photon spectroscopy and in-situ diffuse reflectance infrared Fourier transform spectroscopy (DRIFTs), which suggest that Co 3+ is the active component and lattice oxygen as well as adsorbed oxygen play a critical role in CO oxidation.
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高影响因子
BIOCHEMICAL ENGINEERING JOURNAL
·
2022
·
IF 4.446
Jiabao Xv,Zeyang Zhang,Saizhao Pang,Jiahui Jia,Zixin Geng,Ruirui Wang,Peikun Li,Muhammad Bilal,Jiandong Cui,Shiru Jia
Immobilized carbonic anhydrase (CA, EC4.2.1.1) for CO 2 capture has been intensively investigated. Unfortunately, the immobilized CA usually shows low CO 2 capture efficiency due to lack of CO 2 capture function for the conventional CA supports. In this study, an acid-resistant metal-organic framework MOF-808 was first modified by co-deposition of PEI (polyethyleneimine) and PDA (polydopamine) (PEI/PDA-MOF-808). Subsequently, the PEI/PDA-MOF-808 with a large number of amino groups was used as the strengthening material of CO 2 capture to immobilize CA (CA@PEI/PDA-MOF-808). The resultant CA@PEI/PDA-MOF-808 showed a considerably improved CO 2 capture capacity compared with free CA and PEI/PDA-MOF-808. The amount of CaCO 3 produced by CA@PEI/PDA-MOF-808 was 11.0-fold and 2.5-fold higher than free CA and PEI/PDA-MOF-808, respectively. After 8 consecutive rounds of CO 2 conversion, the total production of CaCO 3 by CA@PEI/PDA-MOF-808 was 92-fold higher than free CA, reaching 294.0 mg. Furthermore, CA@PEI/PDA-MOF-808 displayed high thermostability , pH stability, storage stability, and reusability compared with free counterpart. After 1 h treatment at pH 3.0, CA@PEI/PDA-MOF-808 preserved 53.6% of its original activity while free CA was almost inactivated. In conclusion, this work provides a promising strategy for enzymatic CO 2 conversion.
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高影响因子
JOURNAL OF CONTROLLED RELEASE
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2022
·
IF 11.467
Jiamei Li,Yang Zhou,Jiaqi Liu,Xiaotong Yang,Kai Zhang,Lei Lei,Haili Hu,Huilin Zhang,Liang Ouyang,Huile Gao
As an endogenous gasotransmitter , CO has achieved tremendous advances in cancer treatment through selectively killing cancer cells. However, the application of CO in tumor immunotherapy has not been reported and the tumor targeting delivery is still a tremendous challenge. Herein, thermosensitive boronic acid group-containing CO prodrug was synthesized and fabricated with tannic acid (TA) and iron (Fe) to form metal-phenolic networks, and then loaded with near-infrared (NIR) photothermal agent IR820 to form [email protected] III TA for combinational therapy of CO and photothermal therapy . Ferroptosis can also be enhanced due to the Fe 3+ incorporation. After TA reduced Fe 3+ into Fe 2+ , Fe 2+ might lead to intracellular Fenton reaction. Furthermore, in combination with CTLA-4 blockade immunotherapy, [email protected] III TA remarkably inhibited breast tumor growth, suppressed the lung metastasis and improved the antitumor immune response. To summarize, [email protected] III TA provides a potential novel option for CO/photothermal/immune synergistic therapy with enhanced ferroptosis through simple compositions and facile synthesis process.
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DOI
PubMed
高影响因子
FUEL
·
2022
·
IF 8.035
Junjie Weng,Zhanjun Cheng,Yi Zhang,Chao Jiang,Lin Long,Jian Wang,Jianfeng Pan
The co-utilization of hydrogen-rich plastic and biomass can upgrade bio-oil. This process was further developed by adding catalysts to the co-pyrolysis of biomass and plastic. In this work, thermal and catalytic co-pyrolysis of hemicellulose and polypropylene (PP) was investigated by TG combined with mass spectrometry, which is characterized by in-situ online detection for pyrolysis products. The intrinsic interaction as well as the reaction mechanism were revealed for the catalytic co-pyrolysis. The results show that CaO catalyst can enhance xylan decomposition and increase the production of small alkene from PP. The formation of olefins and furan compounds can be promoted significantly by CaO catalyst. Besides hydrocarbon pool mechanism, Diels-Alder reaction further contributes to additional aromatics formation. This work provides detailed reaction information, which can help to further understand the mechanism of catalytic co-pyrolysis of biomass and plastic.
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高影响因子
COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING
·
2022
·
IF 9.463
Xiu-Zhi Tang,Zijian Liao,Haolong Shi,Rong Wang,Jianling Yue,Xuelong Chen
Electromagnetic wave (EMW) absorption materials have recently received considerable attention due to the increasingly severe EMW pollution. It remains challenging to fabricate a lightweight absorber with high absorption performance and low matching thickness via structure design and composition tuning. Herein, one type of fibrous composite EMW absorber with two-dimensional (2D) nanosheets coating was synthesized by electrospinning, pyrolysis and hydrothermal. The combination of cobalt nanoparticle and carbon nanofiber with decoration of 2D MoSe 2 nanosheets on the surface significantly promote the EMW absorption through dielectric/magnetic loss, impedance matching, diverse polarizations and porous structure induced multiple scattering. Owing to the coupling effect of proper combination of multiple components and hierarchical structure, a strong EMW absorption with minimum reflection loss (RL) −62.30 dB at 10.70 GHz, effective absorption bandwidth (EAB) 5.10 GHz (9.30–14.40 GHz) covering most of the X-band was achieved with absorber thickness of 2.05 mm. By adjusting the thickness to 1.60 mm, the EAB can reach 6.00 GHz (12.00–18.00 GHz), covering the whole Ku bands. This composite fibrous absorber with excellent EMW absorption performance is promising to be used in many EMW attenuation applications.
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高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2022
·
IF 16.744
Jia Xie,Yingpeng Yang,Hao Zhang,Saisai Chen,Zhengjun Lv,Yujun Zhou,Junwen Qi,Xiuyun Sun,Jiansheng Li
Advanced oxidation processes (AOPs) were appealing wastewater treatment options yet practices were hampered by reactor design and diminished performance in complex water matrices. Herein, one-step-pyrolysis strategy was proposed for large-scale synthesis of ZIF-67 derived conductive Co/N carbon hollow fiber ultrafiltration membrane to achieve exceptional availability of catalytic sites and interference prevention from macro molecular substances by size exclusion. Benefitting from the microenvironment modulation and electric field assistance (−1 V, membrane as the cathode), the bisphenol A (as a model micropollutant) can be efficiently removed with enhanced mass transfer of flow-through process (modified apparent reaction rate constant of 1260 μM g cat -1 s −1 ) and the active cobalt species were cycled via electroreduction thus showing exceptional sustainability with nearly zero Co leaching even after 24 h operation. The synergy effects between separation and catalysis alleviated the deteriorated AOPs efficiency and membrane fouling caused by macromolecular organic matter. The integrated membrane system provides new insight into rational design of catalytic membrane and system engineering for advanced water purification.
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高影响因子
CERAMICS INTERNATIONAL
·
2022
·
IF 5.532
Yan Yang,Yawen Deng,Li Zhang,Yaru He,Shuai Zhao,Ting Xiao,Suihu Dang,Yunfeng Bai
Er 3+ /Li + co-doped Y 2 O 3 nanocrystals were synthesized by the sol-gel method. Fluorescence intensity has been enhanced about 270 times under 980 nm laser excitation by combined laser annealing (90 times) and co-doped with Li + ions (3 times). The doping of Li + ions increased the asymmetry around Er 3+ , while laser annealing reduced surface defects . Fluorescence characteristics with the temperature of laser annealed Er 3+ /Li + co-doped Y 2 O 3 nanocrystals were studied. An interesting phenomenon that the non-thermal coupling of I 563 /I 799 transformed into the thermal coupling as the temperature rises is found. The possible mechanisms were discussed, and fluorescence thermometry based on I 563 /I 799 showed higher temperature sensitivity than other reports. The effective fluorescence enhancement method and the new fluorescence thermometry energy levels can promote the application of rare earth fluorescent materials.
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DOI
高影响因子
CHEMICAL PHYSICS LETTERS
·
2022
·
IF 2.719
Jie Xu,Feng Lin,Jingyu Wang,Yujie Wang
Photocatalytic cleavage of lignin C O bonds is a promising way to depolymerize lignin into aromatic value-added chemicals. However, the dispersibility of lignin in solvents and photocatalytic efficiency still face great challenges. Here, a micelle aqueous medium (CTAB-15) composed of hexadecyl trimethyl ammonium bromide and water was successfully prepared. 2-phenoxy-1-phenylethanol (lignin model compounds, PPol) and dioxanesolv poplar lignin have a good dispersion in CTAB-15. Compared to the previous reports, the highest photocatalytic efficiency can be obtained under optimal conditions by using the photocatalyst CdS. The main products formed by photocatalytic cleavage of lignin C O bonds are phenols and ketones. Mechanism studies show that CTAB-15 can provide sufficient hydrogen by photo-driven dissociation of water for photocatalytic cleavage of lignin C O bonds, which is critical to rapidly improving photocatalytic efficiency. The hydrogen, which is used to form acetophenone, comes from H 2 O and PPol. However, the hydrogen needed to form phenol comes only from PPol itself. In addition, the photocatalytic reaction follows a photogenerated electron-hole coupled redox process. This work develops a new direction for promoting the high-value utilization of lignin.
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高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
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2022
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IF 24.319
Anlin Xu,Siyan Fan,Tong Meng,Ren Zhang,Yunhai Zhang,Shunlong Pan,Yongjun Zhang
Metal oxides, as a popular group of ozonation catalyst, are usually synthesized with physiochemical protocols involving hazardous materials and extreme conditions. In this study, a biological method was studied with manganese oxidizing bacteria Pseudomonas sp. to synthesize multi-metal oxides consisting of iron, manganese, and cobalt (Bio-FeMnCoOx) to catalyze ozonation for the first time. It was found that the dosage of cobalt, the cultivation time, and the polishing methods could significantly impact the catalytic activities of degrading benzotriazole as a model. The second-order degrading kinetic constant with optimized Bio-FeMnCoOx was 4.8 times that with the physiochemically synthesized peer. The activity of Bio-FeMnCoOx was compared with other reported catalysts in terms of Rct value. The quenching tests and EPR spectra indicated the participation of hydroxyl radicals, superoxide radicals, and singlet oxygen. The study demonstrates the great potential of biosynthesis as a green protocol for preparing metal oxides to efficiently catalyze ozonation.
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高影响因子
CRYSTENGCOMM
·
2022
·Vol. 24
·期 34
·6018-6030
·
IF 3.756
Mingliang Qin,Yamei Wang,Huaming Zhang,Muhammad Humayun,Xuefei Xu,Yanjun Fu,Marsil K. Kadirov,Chundong Wang
Due to the serious energy and environmental issues, hydrogen generation via water splitting has been regarded as a green and promising alternative strategy to the use of fossil fuels. Developing highly efficient and non-noble metal based dual-functional electrocatalysts for overall water splitting to generate hydrogen and oxygen has become more critical. In order to fulfill the requirements of efficient hydrogen evolution reaction (HER) and oxygen evolution reaction (OER), herein, we report novel hierarchical Co(OH)F@CoFe-LDH heterostructured nanorod arrays fabricated via a facile two-step approach. The resultant Co(OH)F@CoFe-LDH displays exceptional electrocatalytic OER and HER activity with a small overpotential of 240 mV and 130 mV at 10 mA cm−2, respectively. Further, the electrocatalyst revealed excellent long-term stability during a recyclability test for 37 h. The superior performance of Co(OH)F@CoFe-LDH can be attributed to the synergistic effect at the interface of the Co(OH)F nanorods and the covered CoFe-LDH nanosheets. Meanwhile, Co(OH)F@CoFe-LDH as a water electrolyzer to produce a current density of 10 mA cm−2 requires a small voltage of 1.58 V. This work paves the way for the design and construction of low cost and highly efficient 3D hierarchical electrodes for practical applications in electrocatalysis.
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高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2022
·
IF 16.744
Guotai Zhang,Chunxi Hai,Yuan Zhou,Weiping Tang,Jingze Zhang,Jinbo Zeng,Yanhua Liu,Shengde Dong,Guiping Peng
A surge of interest has been attracted by Li 1.6 Mn 1.6 O 4 -type adsorbent for collecting lithium resources from salt-lake brines due to its excellent selectivity, high theorical adsorption capacity up to 72. 3 mg g −1 and low cost. However, its large-scale practical application is limited because of its bone element Mn dissolution during the cycled desorption process. Herein, F and Al co-modifying technique, an efficient method for stabilizing its spinel structure or forming protective coating, was employed to improve the application performances of Li 1.6 Mn 1.6 O 4 -type adsorbent prepared by sol–gel method. Based on the various characterization results, the co-modification not only leads to the formation of fluoride-rich coating and the substitution of Mn 3+ by Al 3+ , but also generates the active adsorbents with abundant nano-islands. DFT calculations revealed that the coating layer is indeed AlF 3 rather than LiF. In addition, in-situ high-temperature XRD tests demonstrates that the co-modification can significantly enhance the heat resistance and structural stability of the material. As-prepared adsorbent exhibits greatly improved Li adsorption capacity (increased from 28.5 to 33.7 mg g −1 ), lower Mn loss rate (decreased from 2.1 to 1.8%), enhanced cycling stability and good adsorption selectivity in the Qarhan brine containing Na + , K + , Ca 2+ , Mg 2+ , which is very significant and important for effectively removing lithium from low-grade brines.
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高影响因子
JOURNAL OF LUMINESCENCE
·
2022
·
IF 4.171
Hao Ren,Shoujun Ding,Hongyuan Li,Wenpeng Liu,Yong Zou,Yufeng Han,Qingli Zhang
Upconversion luminescent materials exhibit excellent near-infrared to visible conversion properties that make them crucial for optoelectronics , visible display devices, and biological labels. Herein, we report a high-quality Yb 3+ and Er 3+ co-doped Gd 3 Sc 2 Al 3 O 12 ( GSAG) single crystal which was grown successfully by the traditional Czochralski method with Er 3+ and Yb 3+ doping concentration of 1 at.% and 10 at.%, respectively. The structure parameters of the crystal were observed by the X-ray Rietveld refinement method. In addition, the transmission and upconversion emission properties of the crystal were analyzed at room temperature . The 940 nm excited upconversion energy transfer mechanism and dependence of the green-to-red upconversion intensity ratio ( I g/r ) on pump power were investigated. A dominant two-photon absorption process of the green and red upconversion emission bands were revealed in Yb,Er:GSAG crystal. The results indicate the crystal is a promising upconversion single crystalline material.
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高影响因子
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