APPLIED CATALYSIS B-ENVIRONMENTAL
·
2021
·
IF 19.503
Yancong Li,Jiliang Ma,Dongnv Jin,Gaojie Jiao,Xiaopan Yang,Kangning Liu,Jinghui Zhou,Runcang Sun
Much attention has been focused on the photocatalytic-reforming of biomass to produce high-value chemicals due to their unique merits. In this study, we report a freezing-thawing strategy for the preparation of an alkaline CuO-chitosan hybrid hydrogel (CuO@CS-H). The synergism between CuO and alkaline chitosan hydrogel led to a highly efficient photocatalytic-reforming of xylose to lactic acid under a weak alkaline system, and the highest lactic acid yield is 81.6 %. The retained lactic acid yield was about 91.2 % after being used nine times. The reaction system is universal for the production of lactic acid from biomass-derived pentoses and hexoses, and O 2 − plays a major role in the synthesis of lactic acid. Industrial production of lactic acid via the as-proposed system was shown to be feasible according to a two-thousand-fold scale-up experiment. This work initiates a novel strategy of photocatalytic synthesis of lactic acid from biomass-based monosaccharides.
研究领域:
生物化学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING SCIENCE
·
2020
·
IF 3.871
Lei Xiao,Lujia Zhao,Xiang Ke,Tengyue Zhang,Gazi Hao,Yubing Hu,Guangpu Zhang,Hu Guo,Wei Jiang
Nanothermites have a promising study in micro propellant due to its faster reaction rate, higher energy-release efficiency, and significantly enhanced combustion performance. However, most thermites prepared by physical mixing are easy to separate during the propellant preparation process, significantly impeding the embodiment of the advantages of thermite. In this study, Al/CuO/PVDF microspheres incorporating high explosive RDX have been successfully assembled by electrospray technology. The thermal and combustion performance of the composite microspheres have significantly improved. They have shorter delay time, burning time, and higher pressure, pressurization rate than the physical mixtures, which are attributed to their uniform structure and the interaction of the components. And based on combustion tests, the combustion performance of microspheres is mainly affected by the content of RDX. These results indicate that the electrospray technology and adding RDX into microspheres are effective methods to prepare nanothermites with enhanced reactivity.
研究领域:
材料科学
·
燃烧与爆炸领域
✓ 已验证
产品关联
DOI
高影响因子
ANALYTICAL CHEMISTRY
·
2020
·
IF 6.785
Shanshan Wu,Qiumin Ye,Datong Wu,Yongxin Tao,Yong Kong
Glycine (Gly), an achiral amino acid, has never been reported for enantioselective recognition owing to the absence of chiral sites. Herein, a facile strategy of chirality transfer is proposed to endow Gly with chirality. Optically active CuO, L-CuO, is first prepared, which can be used for the decoration of Gly through the formation of the Cu(Gly)2 complex. Successful chirality transfer from L-CuO to Gly is confirmed by circular dichroism (CD) spectra. The formation of the Cu(Gly)2 complex is further confirmed by Fourier transform infrared spectra and X-ray photoelectron spectroscopy. Next, the resultant L-CuO-Gly is used for chiral analysis of the isomers of tryptophan (Trp). Because of the higher affinity of L-CuO-Gly toward L-Trp than its isomer, the Trp isomers exhibit significant differences in their oxidation peak currents at the L-CuO-Gly-modified glassy carbon electrode (GCE) (IL-Trp/ID-Trp = 5.24). Finally, the practicability of the developed L-CuO-Gly/GCE is assessed, and the results indicate that it could be a reliable chiral sensor for the quantitative analysis of Trp isomers in nonracemic mixtures.
研究领域:
生物化学
·
分析化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ACS Sustainable Chemistry & Engineering
·
2015
·
IF 4.642
Zhiwei Jiang,Zhanrong Zhang,Jinliang Song,Qinglei Meng,Huacong Zhou,Zhenhong He,Buxing Han
Conversion of cellulose into value-added chemicals and/or fuels has attracted worldwide attention due to the dwindling fossil fuel reserves and concerns over global warming. Herein, the conversion of microcrystalline cellulose into oxalic acid in homogeneous NaOH solution catalyzed by metal oxides under low oxygen pressure was reported. The effects of metal oxides, reaction temperature, reaction time, and oxygen pressure on the yields of the major products were studied. The results showed that a high yield of organic acids, mainly including oxalic acid, formic acid, glycolic acid, lactic acid, and acetic acid, could be obtained. Catalytic amounts of CuO could effectively improve the yield of oxalic acid. The yield of the oxalic acid could be as high as 41.5% with catalytic amount of CuO at oxygen pressure of 0.3 MPa and 200 °C for 2 h. A tentative reaction pathway for the selective oxidation of cellulose into small molecular organic acids in aqueous NaOH solution was investigated and proposed.
研究领域:
化学工程
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
·
2024
·
IF 3
Zou Yanyan,Li Yaoqiang,Zhang Jiaqing,Guo Yi,Song Tonglei,Li Kaiyuan,Xu Mingjun
The incineration of a large number of old cables leads to the problem of green recycling and causes a lot of environmental problems. This paper investigates the effect of copper oxide (CuO) capture of chlorine (Cl) in the pyrolysis recycling of polyvinyl chloride (PVC)-based waste cable outer sheath, focusing on the redistribution of the contaminant Cl components under the action of oxygen (O 2 ). Analytical methods such as ion chromatography and diffraction of X-rays are employed to measure and quantify the dynamic changes of the Cl-containing three-phase products during the pyrolysis process. The results indicate that, compared to copper (Cu), the oxidized state of CuO and O 2 -rich conditions can enhance the capture of Cl. With increasing O 2 supply, 1.71–6.33 mass% of gas-phase Cl and 14.52–29.96 mass% of liquid-phase Cl convert into 16.23–36.29 mass% of solid-phase Cl. CuO reacts directly with the PVC component of the outer sheath in a solid–solid reaction, significantly reducing the generation of polluting Cl-containing aromatic compounds in the liquid-phase tar and synergistically facilitating CaCO 3 components to intimately contact with the pyrolysis gas to capture HCl. The originally stable CuCl 2 crystals are oxidized again to enter into cyclic adsorption in the form of CuO under O 2 -rich conditions. Cl is more fixed in the residue and primarily exists in the form of stable and safe CuCl 2 and CaCl 2 metallic compounds. This study has clearly elucidated the efficient in situ green solidification mechanism of Cl during the treatment of cable waste with CuO in the presence of O 2 , providing new recommendations for cable sheath formulations and solid waste management.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
Environmental Technology & Innovation
·
2025
·
IF 7.1
Cheng Zhang,Ziyi Yang,Jing Chen,Yifan Xu,Zezhi Chen,Huijuan Gong,Feng Lin,Houhu Zhang
Activated carbon (AC) adsorption is the primary method for removing siloxanes from biogas, but siloxane polymerization during adsorption hinders regeneration, limiting the reuse of adsorbents and long-term biogas utilization. This study investigates the thermal regeneration efficiency of copper oxide-modified activated carbon (CuO/AC) compared to conventional AC for removing octamethylcyclotetrasiloxane (D4) from biogas, and employed GPC, XPS, and theoretical calculations to elucidate the role of CuO in enhancing regeneration performance. CuO/AC achieved a regeneration efficiency of 70.3 % at 230°C, 26.9 % higher than AC, with no residual D4 detected and the formation of higher molecular weight polymers. DFT calculations indicated that Si–O bond cleavage requires less energy on CuO than on AC, consistent with XPS results, confirming that CuO acts as a Lewis acid site to catalyze the ring-opening polymerization of D4, and promote the further volatilization of PDMS depolymerization products at elevated temperatures, thereby improving the regeneration efficiency of AC-based adsorbents. This work provides new insights into the reuse of activated carbon in conventional biogas purification processes.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Nano Materials
·
2024
·
IF 5.3
Chaofan Ma,Qun Yang,Huiyu Su,Huimin Yang,Xiaoxia Wang,Dawen Zeng
P-type semiconductors [copper oxide (CuO) and cuprous oxide (Cu2O)] have been widely researched as good gas sensing materials due to their unique oxygen adsorption properties. In this work, C-doped CuO/Cu2O hollow nano-octahedrons have been prepared by thermal decomposition of the Cu-based metal–organic framework ([Cu3(BTC)2]n). The CuO and Cu2O nanoparticles form nano-octahedron heterojunctions by a close packing mode. A large number of active heterojunction sites were exposed, which significantly increased the adsorbed oxygen (O2–) content. Meanwhile, doping C in the lattice of the heterojunction effectively reduces the band gap of CuO/Cu2O and promotes the chemical reaction of the target gas on the surface of the material. Density functional theory calculations indicate that the CuO/Cu2O heterojunction has strong adsorption ability for NO2. Electrochemical impedance spectroscopy further reveals that C-doped CuO/Cu2O hollow nano-octahedrons-40 min heterojunction has the best electron transport performance. The sensors have good gas sensing response (22.88–50 ppm) and selectivity to nitrogen dioxide (NO2) at room temperature (28 °C). In addition, the sensor has extremely low detection, which can detect parts per billion level NO2 (20.50% to 100 ppb). It is expected to provide a reference for the development of a room-temperature NO2 sensor.
研究领域:
材料科学
·
化学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Environmental Chemical Engineering
·
2024
·
IF 7.4
Fangcong Lin,Leiping Wang,Xiaorong Dai,Zun Man,Yang Meng,Dongtao Chu,Yuting Yang,Wei Wang,Hang Xiao,Kaiying Wang
Effective treatment of hydrogen sulfide (H 2 S) is crucial for minimizing nuisance odors from intensive livestock and poultry operations. The development of high-performance desulfurizers holds practical significance in this context. Herein, a novel CuO-CaCO 3 co-impregnated biochar desulfurizer (Cu x Ca y /BC T ) was synthesized by impregnation-pyrolysis method, using waste tea stalks and metal salts as raw materials, and it is intended for the treatment of H 2 S at room temperature. The optimized Cu 0.75 Ca 0.25 /BC 800 shows an excellent H 2 S removal capacity of 182.67 mg/g, which is 31 times and 5.6 times that of inactivated biochar (BC 800 ) and copper-oxide-impregnated biochar (Cu 0.75 /BC 800 ). The desulfurization mechanism of Cu 0.75 Ca 0.25 /BC 800 involves synergistic effect of reactive adsorption and catalytic oxidation . CaCO 3 ’s alkaline adsorption sites and copper-mediated activation of superoxide radicals (∙O 2 - ) were critical in this reaction. Besides, Cu 0.75 Ca 0.25 /BC 800 demonstrated excellent reusability, retaining approximately 85 % of its initial H 2 S removal capacity after seven cycles of desulfurization and regeneration. This study aims to develop a metal oxide- and carbonate-impregnated biochar-based desulfurizer, with the goal of advancing the technology for catalytic removal of H 2 S in a more environmentally friendly and effective manner.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
Cell Reports Physical Science
·
2021
·
IF 0
Yiqiang Jiang,Changhyeok Choi,Song Hong,Senlin Chu,Tai-Sing Wu,Yun-Liang Soo,Leiduan Hao,Yousung Jung,Zhenyu Sun
Electrochemical CO 2 reduction to multi-carbon fuels and chemicals is intriguing but remains a challenge. Here, we report that a combination of Sn doping and creation of oxygen vacancies (V O ) can synergistically boost CO 2 reduction to C 2 H 4 over CuO nanosheets with an onset potential of −0.7 V (versus reversible hydrogen electrode). The activity and selectivity of CuO can be easily tuned by manipulation of Sn dopant and V O contents. The Faradaic efficiency toward C 2 H 4 formation over Sn-doped CuO(V O ) approaches 48.5% ± 1.2%, which maintains stability over 24 h at a mild overpotential, in contrast to a maximum of 26.8% ± 2.2% over pristine CuO. The Sn-doped CuO(V O ) catalyst presents an approximately 2.3-fold improvement in C 2 H 4 current compared to undoped CuO at similar overpotentials. Theoretical calculations further show that doping of Vo-enriched CuO surface by Sn lowers the dimerization energy of adsorbed CO intermediate, thereby promoting C–C coupling to yield C 2 H 4 .
研究领域:
电化学
·
材料科学
·
催化反应
✓ 已验证
DOI
Advanced Materials Interfaces
·
2021
·Vol. 8
·期 20
·2100691
·
IF 6.147
Pei Lyu,Xiangyi Zhang,Mengyuan Peng,Bin Shang,Xin Liu
It is highly desirable to endow surfaces with both exceptional droplet nucleation and removal capacities for water harvesting, but which still remains great challenges. Inspired by the water collection features of desert beetles and Nepenthes pitcher, this paper presents a facile and simple strategy to fabricate a wettable patterned slippery surface (WPSS). Different from desert beetles-inspired water harvesting materials which the (super) hydrophilic bumps are constructed on a (super) hydrophobic background, the patterned hydrophilic CuO bumps in this study are surrounded by the silicone oil layer. Owing to the patterned hydrophilic bumps and slippery interface, as well as the flexibility in manipulating the relative ratio between them, the innovated WPSS is capable of rapidly nucleating and removing water droplets. It outperforms conventional liquid-repellent surfaces in water harvesting performance.
研究领域:
材料科学
·
仿生学
✓ 已验证
DOI
高影响因子
ChemCatChem
·
2017
·Vol. 10
·期 4
·710-715
·
IF 4.803
Liang Cui,Xueying Cao,Xuping Sun,Wenrong Yang,Jingquan Liu
Graphical Pick of the bunch : A bunch-like CuO nanowire array on copper foam (b-CuO NA/CF) is obtained by a facile and economical method. This nanowire array behaves as an efficient and durable catalyst for hydrogen generation from the controlled methanolysis of ammonia borane (AB). The dehydrogenation of ammonia borane (AB) is an effective method to produce and store hydrogen, but efficient, durable, and low-costing dehydrogenation catalysts are lacking. In this work, we successfully prepared a self-supported bunch-like copper oxide nanowire array on copper foam (b-CuO NA/CF) through a facile in situ wet oxidation and annealing method. b-CuO NA/CF shows high catalytic activity for the methanolysis of AB with an initial turnover frequency of 13.3 mol mol CuO −1 min −1 and an activation energy of 34.7 kJ mol −1 . Moreover, this self-supported bunch-like nanoarray catalyst could be easily separated from fuel solutions with excellent stability and maintained its activity even after prolonged use. It is thus an efficient, economical, and durable catalyst for hydrogen fuel cells.
研究领域:
材料科学
·
催化化学
✓ 已验证
产品关联
DOI
高影响因子
DALTON TRANSACTIONS
·
2018
·Vol. 48
·期 3
·891-897
·
IF 4.099
Bing Chang,Yingchun Yang,Zhixiang Ye,Shengyu Liu
Hydrogen is the most attractive source of energy in the 21st century. However, high-efficiency mass production of hydrogen still faces many challenges. Although electrochemical water splitting is an ideal way to produce hydrogen, it requires low-cost and efficient electrocatalysts. In this work, a hybrid shell/core Co–P/CuO nanowire array was fabricated by Co–P film electrodeposition on a CuO nanowire array. Because of the synergy between Co–P and CuO nanowire arrays, Co–P/CuO shows remarkable activity toward the hydrogen evolution reaction (HER) and the oxygen evolution reaction (OER). This bifunctional electrocatalyst achieving 20 mA cm−2 requires a cell voltage of only 1.645 V, and has superb long-term electrochemical stability and high faradaic efficiency.
研究领域:
材料科学
·
能源化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）