JOURNAL OF ALLOYS AND COMPOUNDS
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2024
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IF 5.8
Yaqi Wu,Jianhua Qian,Jinjuan Xing,Junhua Li,He Huang,Yanan Wang,Jiasheng Xu
Toluene is one of the most toxic contaminants in industrial waste gases, it can enter the body through the respiratory system and skin. Long-term exposure to it can lead to skin inflammation and neurasthenia, and even cause lesions in organs. Over the years, catalytic oxidation technology has been extensively employed to the remove of toluene, and oxides, especially copper oxide, is considered to be an effective catalyst technology and has been extensively studied. In this work, we introduced CuO as an active species to investigate the impact of Cu content in TiO 2 @CuO (TC-x, x=1, 2, 3, and 5) catalyst on the activity, reusability, and stability of toluene oxidation. The result demonstrated that the addition of Cu species, facilitating the generation of active oxygen obviously reduced the complete oxidation temperature of toluene. Among them, TC-3 catalyst exhibited the highest activity (T 50 = 234 ℃, T 90 = 289 ℃, and T 100 = 310 ℃, with C toluene =1000 ppm, WHSV=20,000 mL/ (g h)), great reusability, and stability for toluene degradation. According to the in-situ DRIFTS, the ultimate degradation products of toluene were CO 2 and H 2 O, which were clean and free of secondary pollution.
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Journal of Environmental Sciences
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2024
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IF 5.9
Zhiqiang Zhang,Wenhang Li,Cailin Zheng,Kunyu Chen,Heliang Pang,Wenxin Shi,Jinsuo Lu
Catalytic reduction of nitrate over bimetallic catalysts has emerged as a technology for sustainable treatment of nitrate-containing groundwater. However, the structure of bimetallic has been much less investigated for catalyst optimization. Herein, two main types of Pd-Cu bimetallic nanocrystal structures, heterostructure and intermetallic, were prepared and characterized using high-resolution transmission electron microscopy (HRTEM), X-ray diffraction (XRD), and X-ray photoelectron spectroscopy (XPS). The results show that two individual Pd and Cu nanocrystals with a mixed interface exist in the heterostructure nanocrystals, while Pd and Cu atoms are uniformly distributed across the intermetallic Pd-Cu nanocrystals. The catalytic nitrate reduction experiments were carried out in a semibatch reactor under constant hydrogen flow. The nitrate conversion rate of the heterostructure Pd-Cu nanocrystals supported on α-Al 2 O 3 , γ-Al 2 O 3 , SBA-15, and XC-72R exhibited 3.82-, 6.76-, 4.28-, 2.44-fold enhancements relative to the intermetallic nanocrystals, and the nitrogen and nitrite were the main products for the heterostructure and intermetallic Pd-Cu nanocrystals, respectively. This indicates that the catalytic nitrate reduction over Pd-Cu catalyst is sensitive to the bimetallic structures of the catalysts, and heterostructure bimetallic nanocrystals exhibit better catalytic performances on both the activity and selectivity, which may provide new insights into the design and optimization of catalysts to improve catalytic activity and selectivity for nitrate reduction in water.
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PubMed
高影响因子
PROCESS BIOCHEMISTRY
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2024
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IF 3.7
Hongbo Suo,Xinzheng Liu,Shu Chen,Qi Li,Xiangnan Liu,Lili Xu
Biodiesel is more environmentally friendly compared to traditional petroleum diesel. The method of producing biodiesel catalyzed by lipases, as a green chemistry technology, can further reduce its negative impact on the environment. In this work, lipase immobilized on magnetic cellulose was embedded in Cu(PABA), and then the biocomposite (MCL@Cu(PABA)) was used for biodiesel production. The good biocompatibility and flexible skeleton structure of cellulose can buffer the compression effect on enzyme molecules during the formation of Metal-Organic Frameworks (MOFs), and the MOFs protective layer can reduce the damage caused by denaturants to enzyme molecules. The biocatalyst showed enhanced activity and stability with a lower deactivation constant ( K d ). Under the optimized reaction conditions, the biodiesel yield can reach 78.4 %. After reused for 7 times, the biocatalyst can still achieve a biodiesel yield of 58.8 %. Moreover, after stored for 30 days, the biodiesel yield can still reach 70.3 %. For all experimental yields, the standard deviation (SD) ranged from 2.4 % to 4.5 %. Secondary structure analysis showed that the rigid structure and active conformation of lipase was enhanced after Cu(PABA) encapsulation.
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高影响因子
VACUUM
·
2024
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IF 3.8
Xiu Wen,Zhixiu Yang,Lijing Gao,Ruiping Wei,Xiaomei Pan,Jin Zhang,Guomin Xiao
Electrocatalytic reduction of CO 2 affords a potential way to mitigate the greenhouse effect and fuel crisis. In this work, we compared highly-dispersed CuO nanocomposites and Cu–Cu 2 O nanocomposites which all derived from Cu x Al-LDH for CO 2 electrochemical reduction . The Cu–Cu 2 O based nanocomposites obtained through the restoration strategies still retain its layered structure, simultaneously increasing dual Cu–Cu 2 O active sites, which exhibit excellent performance in selective reduction of CO 2 to C 2 H 4 . The Cu 5 Al-ER obtained through in-situ electrochemical reduction is modified by bulk phase, which can regulate active species, increase surface active sites, enhance C–C coupling. Meanwhile, the electrochemical strategy offers numerous benefits, including gentle conditions, adjustable monitoring, exceptional efficiency and adaptability. We have confirmed that cost-effective Cu–Cu 2 O based nanocomposite derived from Cu 5 Al-LDH can effectively promote C–C coupling during electrochemical CO 2 conversion and improve FE C2H4 . The FE C2H4 of Cu 5 Al-ER reaches 36% at −1.2 V vs. RHE. And the current density reaches −172 mA·cm −2 at −1.6 V vs. RHE. The results showed that compared to Cu 5 Al-LDO, the FE C2H4 of Cu 5 Al-ER increased by 2.6 times. In addition, Cu 5 Al-ER exhibits excellent stability during the 12 hours CO 2 catalytic reduction process.
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SURFACE & COATINGS TECHNOLOGY
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2024
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IF 5.3
Guangyin Liu,Yuhui Zhang,Chaofan Ma,Qin Tang,Hanbing Li,Shiqi Chen,Jun Shen
The gallium (Ga) base liquid metal (LM) with high thermal conductivity and deformability is applied widely in thermal management in electrical systems. However, Ga readily reacts with Cu to form intermetallic compounds (IMCs), which can cause failure in electronic devices. Herein, the thermal interface material (TIM) with Ga and diamond is prepared to analyze the reaction behavior of TIM and Cu/Ni-plated Cu under an aging test at 125 °C. The results show that Ga reacts with Cu substrate and forms CuGa 2 bulk. Moreover, Ni coating can inhibit the corrosion of Ga and Cu. However, the as-volcano IMC structures were generated, also. The thermal resistance increased from 2.24 mm 2 ·K·W −1 to 14.47 mm 2 ·K·W −1 from initial time to 200 h. The interfacial corrosion behavior between TIM and Cu substrate is studied by first-principles molecular dynamics simulation. The diffusion coefficient in the z direction of Cu is 0.04 × 10 −5 cm 2 /s. In a word, the work could provide the guidelines for the further design of high-performance corrosion resistance in the region where Ga was used for thermal management on electronic products.
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高影响因子
ACS Applied Energy Materials
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2024
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IF 5.4
Xiang Li,Zhitao Liu,Liyuan Zeng,Wanyi Ye,Guangxing Yang,Qiao Zhang,Shengjun Du,Zhiting Liu,Feng Peng
The CO2 electrochemical reduction (CO2ER) to produce valuable multicarbon products represents a promising approach for enhancing CO2 conversion. While previous research has investigated the impact of Cu electrode surface topography on C2 production, it is important to note that other parameters were also altered concurrently with changes in roughness. To isolate the specific effect of surface texture on CO2 electroreduction, this study prepared Cu layers with varying textures using the sputtering method with a varied sputtering time. To characterize the surface features of the sputtered Cu layers, the developed interfacial area ratio (Sdr), known as areal parameter, was introduced, with the aim of correlating it with C2 product selectivity. The results of this study indicate that the improved selectivity of C2 products can be attributed to higher Sdr values, primarily due to a rougher and finer surface texture that increases the local concentration of CO and OH–. This research underscores the significance of surface topography and offers perspectives for designing efficient Cu electrodes for the CO2ER.
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高影响因子
CERAMICS INTERNATIONAL
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2025
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IF 5.6
Yi Fang,Lang Yang,Feng Rao,Yongming Zheng,Zhenguo Song
In this study, a low-cost porous geopolymers (PGP) were prepared using coal gangue and fly ash as raw materials to remove organic and heavy metal ions from wastewater. Various characterization techniques were employed to investigate the microstructure, morphology, pore size distribution, and surface functional groups of the porous geopolymers. The results indicate that the geopolymer exhibits a porous structure with hydroxyl groups on the surface after foaming. It was found that the porous geopolymers exhibited good adsorption capacity for Methylene Blue (MB), Cu(II), and Pb(II), with optimal adsorption capacities reaching 35.60 mg/g, 98.31 mg/g, and 85.67 mg/g, respectively. Fitting analysis suggests that the adsorption of MB, Cu(II), and Pb(II) is better described by the pseudo-second-order kinetic model and the Freundlich isotherm model. This indicates that the adsorption process is primarily chemical adsorption with multilayer adsorption. Competitive adsorption studies showed that Cu(II) could enhance the adsorption of MB, while Pb(II) had no significant effect on the adsorption of MB. Mechanistic studies revealed that the adsorption of MB by PGP is mainly through pore adsorption, electrostatic attraction, and hydrogen bond formation; whereas the adsorption of Cu(II) and Pb(II) is primarily through pore adsorption, electrostatic attraction, chemical reactions, and ion exchange. Recycling experiments demonstrated that after five repetitions, the adsorption capacity of PGP for the three pollutants remained above 60 %. These findings confirm the potential of porous geopolymers as adsorbents. Preliminary cost analysis shows that the adsorption cost of porous geopolymers is only 2.07 RMB/kg, making the geopolymer adsorbent economically advantageous and promising for application, especially considering its ability to utilize industrial solid waste.
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高影响因子
FUEL
·
2024
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IF 6.7
Jingjing Wang,Xinjie Wei,Zhihui Wen,Junjie Liao,Liping Chang,Jiancheng Wang,Kechang Xie
Ultra-deep desulfurization for the generation of clean petrol, diesel, and benzene remains a significant and challenging goal globally. Cu-containing materials have emerged as a promising desulfurization strategy due to their high adsorption capabilities. However, existing reduction technologies often lead to over-reduction. In this study, we reveal an intriguing and unexpected property of Y zeolite following ammonium ion exchange. The in situ generation of ammonia from ammonia pools may alter the location of copper species and modify their acid characteristics. We encapsulated various amounts of Cu into CuY zeolite, labelled as H-Cu X -Y(APE), using a facile self-reduction strategy. Notably, H-Cu 5.71 -Y(APE) exhibits an exceptional breakthrough sulfur capacity for thiophene, achieving 4.17 mg/g, nearly double that of traditional Cu-HY(H 2 ). XPS analysis following APE reduction indicates a high proportion of Cu + species in H-Cu 5.71 -Y(APE). In situ calcination FT-IR provided detailed insights into the chemical transformation of Cu 2+ species during APE reduction. Furthermore, CO-FTIR analysis shows that the Cu + content in the supercages of H-Cu 5.71 -Y(APE) reaches a maximum of 62.3 %. Py-FT-IR reveals the strong Brønsted acid content in H-Cu X -Y(APE) significantly increases. The desulfurization mechanism of H-Cu X -Y(APE) was thoroughly investigated using in situ FT-IR, demonstrating that the protonation and copolymerization of thiophene occurred on HCuY(APE) and could be effectively suppressed by adjusting the amount of copper. This work presents a promising solution for efficient ultra-deep desulfurization using an in situ NH 3 reduction method from ammonia pools.
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SEPARATION AND PURIFICATION TECHNOLOGY
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2024
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IF 8.1
Fan Feng,Haiyang He,Dan Liu,Siqing Liu,Jianjun Fang,Shuming Wen
This study presents an organic reagent, quercetin, as a flotation depressant used to effectively separate chalcopyrite and galena. Quercetin and O-isopropyl-N-ethyl thionocarbamate (IPETC) are used as depressants and collectors, respectively, and results of micro-flotation tests showed that quercetin can depress galena and has less effect on chalcopyrite. Tests of artificially mixed samples of the chalcopyrite and galena show that the separation effect of quercetin as a depressant is better than that of sodium sulfate and sodium silicate combined depressant, it is close to that of potassium bichromate as a depressant, that is, it has the potential to be a depressant to achieve selective separation of chalcopyrite and galena. The X-ray Photoelectron Spectroscopy and Fourier Transform Infrared Spectroscopy results demonstrate that quercetin can chemisorb with oxidized metal sites on minerals’ surfaces. Results of the contact angle, adsorption capacity, and Atomic Force Microscope show that quercetin has comparable adsorption amounts on both minerals’ surfaces, and can hinder the IPETC adsorption on the mineral surface, but the amount of IPETC adsorb on chalcopyrite is much higher than on galena surfaces. The differences in the adsorption of the collector on their surface are the main reason for realizing the separation of chalcopyrite from galena.
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高影响因子
APPLIED SURFACE SCIENCE
·
2024
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IF 6.3
Xuanqi Hao,Xiao Zhang,Chenchen Liu,Ping Yang
Metal element doping often can improve the photoluminescence (PL) of carbon dots (CDs). In this paper, blue and green emitting CDs (BCDs and GCDs) were synthesized by using phenylenediamine as the carbon and nitrogen sources. Cu-doped CDs (Cu-CDs) were fabricated by using copper acetylacetone as a precursor. The PL peak wavelengths of sample Cu-doped blue CDs (Cu-BCDs) and green CDs (Cu-GCDs) were 450 and 543 nm, respectively. The full width at half maximum of PL spectra were 67.31 and 93.13 nm, the PL quantum yields (PLQYs) were 13.6 and 38.7 %, and the average fluorescence lifetimes were 4.34 and 20.97 ns, respectively. The PL intensity of the Cu-CDs samples was enhanced with the photostability, and thermal stability test results showed that the Cu-CDs samples also had excellent stability. The Cu-BCDs and Cu-GCDs were employed in the field of sensing applications due to their excellent selectivity towards Cr (VI) and tetracycline hydrochloride (TC) detection. The detection limits for Cr (VI) and TC using Cu-BCDs were 0.34 and 0.86 μM, while Cu-GCDs showed detection limits of 0.47 and 0.50 μM, respectively, demonstrating the broad application prospect for Cu-CDs in sensing applications.
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高影响因子
Journal of Energy Storage
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2024
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IF 8.9
Mengqi Liu,Honglin Yu,Daiming Liu,Guodong Zhang,Fei Wang
In order to enhance CH 4 adsorption and absorption performance, ZIF-8@Cu was prepared by precipitation method at room temperature, while a hydrate accelerator of SO 3 − @PSNS was synthesized by the polymerization method, and CH 4 adsorption-absorption synergistic storage in ZIF-8@Cu that pre-adsorbed SO 3 − @PSNS solution was evaluated for the first time. It was found that Cu 2+ can effectively improve the adsorption kinetics of CH 4 , causing ZIF-8@Cu to reach a higher adsorption capacity, and CH 4 adsorption capacity of ZIF-8@Cu /0.14% is 12.45 % higher than that in ZIF-8. Furthermore, Cu 2+ provides additional nucleation sites for CH 4 hydrate, thereby enhancing the overall CH 4 storage density. For the water content of R w = 0.5, the doping of 0.14 % Cu 2+ causes CH 4 storage capacity via adsorption-absorption synergy increases by 33.93 %. It is worth to note that SO 3 − @PSNS significantly reduces hydration pressure while retains CH 4 adsorption ability in ZIF-8@Cu. For R w = 0.5, hydration pressure in SO 3 − @PSNS system reduces by up to 45 % compared with that in water system, while CH 4 storage capacity increases by up to 94 %. This finding makes it possible for CH 4 dense storage under low pressure via adsorption-hydration hybrid approach.
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Chemical Engineering and Processing-Process Intensification
·
2024
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IF 3.8
Xiaocui Zhang,Xiaoxin Wang,Jun Gao,Jiangcheng Li,Xiangfeng Liang,Qinghui Shou
The global need for bromide ions (Br - ) has driven the research focus to extract them from various liquid ores. Highly efficient and selective adsorbent is still lacking. MOF with large surface area and structural stability are promising candidate for Br - extraction. In this work, we prepared Cu-MOF-74 nanocrystals. Abundant hydroxyl groups on them spontaneously reduced Ag + to Ag 0 nanoparticles, resulting in the fabrication of Ag 0 doped Cu-MOF-74. The crystalline structure retains after the doping of Ag 0 when the mass ratio of silver nitrate to MOF is <0.5. The crystals are distorted or even damaged when the ratio is higher than 1.0 according to XRD and DFT calculation. The adsorption capacity of Ag 3 -Cu-MOF-74 is 232.92 mg g -1 , surpassing the capacities of most previously documented adsorbents. The desorption of Br - and thereafter the recovery of adsorbent could be realized through light driven decomposition of AgBr. This MOF adsorbent shows promising application potential in Br - recovery from various liquid ores.
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高影响因子
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