JOURNAL OF ENVIRONMENTAL ENGINEERING
·
2020
·Vol. 147
·期 1
·04020142
·
IF 1.264
Yuefeng Qiu,Liming Kong,Tonghe Chen,Qin Xu
Cu+-modified SBA-15 (Cu+/SBA-15, SBA-15 refers well-ordered hexagonal mesoporous silica) was prepared for adsorption of tetracycline (TC) by the pH adjusting reduction method. Some Cu+ species (Cu2O) are aggregated on the outside surface of SBA-15, and the other Cu+ species are highly dispersed in SBA-15 via ≡Si-O-Cu. Its adsorption mechanism was firstly studied via comparison with CuO/SBA-15. The TC adsorption kinetic of Cu+/SBA-15 fitted the pseudo-second-order model well. The adsorption isotherms at 293, 303, and 313 K were determined and modeled with Langmuir and Freundlich equations, and the Qmax of Cu+/SBA-15 for TC calculated from Langmuir model could reach 961.54 mg/g at 313 K. Its good adsorption performance for TC is associated with the high surface area of SBA-15, highly dispersed Cu+ species, and mesoporous structure. The adsorption of Cu+/SBA-15 for TC is an endothermic process, and adsorption heat is 66.88 kJ·mol−1, which implies that the adsorption process of Cu+/SBA-15 for TC is weak chemisorption. The adsorption mechanism of Cu+/SBA-15 was mainly explored via comparing with CuO/SBA-15 by Fourier transform infrared spectroscopy (FTIR) and X-ray photoelectron spectroscopy (XPS) spectroscopy analysis. Besides the coordination complexation of Cu+ with NH2 radical of TC, the π-complexation between Cu+, and the benzene ring of TC improved the adsorption capacity of Cu+/SBA-15 for TC comparing with CuO/SBA-15 and showed a dominant role for TC adsorption.
研究领域:
环境科学
·
材料科学
·
化学工程
·
分析化学
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DOI
高影响因子
Journal of Macromolecular Science Part A-Pure and Applied Chemistry
·
2019
·
IF 1.163
Peng Zhou,Hua Yuan,Lijun Ou,Peng Zhiyuan
Tannin was crosslinked with paraformaldehyde to prepare tannin-phenolic polymer(TP), TP immobilized on cellulose (TPPC) was prepared by the cross-linking reaction of TP and cellulose with epichlorohydrin as crosslinking agent. Tannin was crosslinked prior to being immobilized on cellulose, which could increase the effective phenolic hydroxyl content in cellulose skeleton and improve the adsorption property of TPPC for metal ions. The maximum adsorption capacity of TPPC for Cd(II) and Cu(II) ions were 80.11 mg/g and 55.97 mg/g, respectively. The adsorption equilibrium data for the metal solutions fitted the Langmuir model well. The adsorption rate data fitted well to a Pseudo-second-order model. The TPPC has potential application value in the field of metal wastewater treatment.
研究领域:
环境科学
·
高分子科学
·
水处理技术
·
吸附技术
·
化学工程
✓ 已验证
DOI
高影响因子
Journal of Materials Chemistry A
·
2021
·Vol. 9
·期 40
·23234-23242
·
IF 12.732
Hongyu Chen,Zhaojie Wang,Shoufu Cao,Siyuan Liu,Xiaojing Lin,Yi Zhang,Yizhu Shang,Qiuying Zhu,Sainan Zhou,Shuxian Wei,Baojun Wei,Daofeng Sun,Xiaoqing Lu
The electrocatalytic CO2 reduction reaction (CO2RR) on copper-based catalysts is a promising method to produce valuable chemicals, but its selectivity is much lower than expected largely due to insufficient research on the structure of new materials. Herein, the antimony-doped Cu/Cu2O (Cu/Cu2O–Sb) catalyst is developed for a highly selective CO2RR to CO. The synthesized Cu/Cu2O–Sb exhibits intensive suppression of hydrogen evolution, a low overpotential and high faradaic efficiency (FE) towards CO. The CO selectivity is as high as ∼95% with a partial current density of ∼6.3 mA cm−2 at −0.9 V and maintains over 90% in a broad range of potentials. DFT calculations reveal that the doping of antimony achieves the distinct activation of CO2 and suppression of hydrogen evolution. Meanwhile, the pre-adsorbed *CO significantly promotes the desorption of the neighboring *CO, which is the key for high selectivity of CO2RR to CO. This work will provide a new consideration for the origin of high selectivity during the CO2RR and pave the way toward design of highly selective CO2 reduction catalysts.
研究领域:
电化学
·
催化
·
材料科学
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DOI
高影响因子
Small
·
2025
·
IF 12.1
Guangrong Qian,Renyuan Deng,Xiangmei Liu,Yi Wang,Jin Huang,Congyang Mao,Chaofeng Wang,Hanpeng Liu,Zhaoyang Li,Shengli Zhu,Hui Jiang,Zhenduo Cui,Yufeng Zheng,Shuilin Wu
The transmission of pathogenic bacteria via the contaminated surfaces of interactive touchscreens is an important route of infection. It is therefore imperative to develop a functional film with antibacterial properties to prevent cross-infection. In this paper, a bilayer thin-film structure composed of iron-doped and copper-doped zinc oxide (Fe-ZnO/Cu-ZnO) is synthesized through a spin coating technique based on sol-gel. The synergistic effects of metal ion doping, combined with the influence of the internal electric potential, during the photocatalytic reaction process, promote the separation and migration of photogenerated carriers. As a result, it notably boosts the photocatalytic properties. The nanofilm is demonstrated to achieve a rapid bactericidal effect (surpassing 90%) under sunlight irradiation. Furthermore, it is shown to completely kill bacteria after 20 min of illumination and to maintain excellent antibacterial performance (surpassing 90%) for a period of 30 days. Concurrently, the thin film displays both exceptional light transmittance (surpassing 90%) and noteworthy benefits, including environmental sustainability, cost-effectiveness, and the capacity for safe disinfection. The thin film exhibits considerable potential for implementation on surfaces subject to high-frequency public contact. It boasts extensive application prospects and serves as a foundational reference for the design of photocatalytic antibacterial thin films.
研究领域:
材料科学
·
纳米技术
·
光催化
·
环境科学
·
表面工程
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产品关联
DOI
PubMed
高影响因子
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
·
2025
·Vol. 64
·期 27
·e202425601
·
IF 16.9
Yuemei Li,Shi-Yu Guo,Hongfei Gu,Bingyu Wang,Peiwu Su,Xiuming Zhang,Haoqing Zhang,Shuping Zhang,Fanzhi Yang,Jia Liu,Qing-An Chen,Jiatao Zhang
Visible light photoredox catalysis has become a rapidly emerging area owing to its potential of using sunlight to tame previously hard-to-harness radicals for organic synthesis. At present, such a blueprint faces a significant challenge, namely how to accomplish thermodynamically demanding reactions with sunlight encompassing a wide range of low-energy photons. Here, we report a new reaction framework to overcome this bottleneck through decoupling the thermodynamic limits of photoreduction from photoexcitation. This is fulfilled based on the construction of a heterogeneous photocatalyst Cu@CdS possessing in situ-formed surficial polysulfide species (including S 3 •− and S 4 2− ), which can efficiently harvest solar energy via plasmonic absorption of Cu while manifest sufficient redox potential for activating inert aryl bromides/chlorides enacted by excited polysulfides. We demonstrate that this designed material composes a potent photoredox catalyst for efficient aryl cross-coupling, borylation, hydrogenation, as well as Birch-type dearomatization reactions, with good recyclability and stability. In particular, when exclusively using natural sunlight as an energy source, the product yield can still reach up to 90%. Our findings introduce a straightforward yet viable way to progress toward the century-long dream of leveraging natural sunlight to produce structurally complex organic molecules, just like plants on Earth. Graphical Chemists have long aspired to construct complex organic compounds the way that plants do by harnessing natural sunlight as an energy source. This study presents an advancement toward this goal via synergistic exploitation of the plasmonic absorption of Cu and the unique redox potentials of excited polysulfide species (S 3 •− and S 4 2− ) on semiconductor surfaces to decouple the thermodynamic limits of photoreduction from photoexcitation.
研究领域:
光催化
·
有机合成
·
材料化学
·
可再生能源
·
物理化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Small
·
2024
·
IF 13
Jing Gao,Yuan Gao,Jinghua Hao,Xiaolin Sun,Fuhua Zhao,Yuan Zhang,Wenyan Si,Jianfei Wu
All-solid-state lithium sulfide-based batteries (ASSLSBs) have drawn much attention due to their intrinsic safety and excellent performance in overcoming the polysulfide shuttle effect. However, the sluggish kinetics of Li 2 S cathode severely impede commercial utilization. Here, a Cu + , I − co-doping strategy is employed to activate the kinetics of Li 2 S to construct high-performance ASSLSBs. The electronic conductivity and Li-ion diffusion coefficient of the co-doped Li 2 S are increased by five and two orders of magnitude, respectively. Cu + as a redox medium greatly improves the reaction kinetics, which is supported by ex situ X-ray photoelectron spectroscopy. Density functional theory calculation (DFT) shows that Cu + , I − co-doping reduces the Li-ions diffusion energy barrier. The co-doped Li 2 S exhibits a remarkable improvement in capacity (1165.23 mAh g −1 (6.65 times that of pristine Li 2 S) at 0.02 C and 592.75 mAh g −1 at 2 C), and excellent cycling stability (84.58% capacity retention after 6200 cycles at 2 C) at room temperature. Moreover, an ASSLSB, fabricated with a lithium-free (Si─C) anode, obtains a high specific capacity of 1082.7 mAh g −1 at 0.05 C and 97% capacity retention after 400 cycles at 0.5 C. This work provides a broad prospect for the development of ASSLSBs with practical energy density exceeding that of traditional lithium-ion batteries.
研究领域:
材料科学
·
电化学
·
电池技术
✓ 已验证
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2025
·
IF 6.9
Zong Li,Kaili Ni,Yifei Wang,Yuan Rui,Miaohui Wang,Haiping Lin,Peipei Huang,Qing Li
Achieving high activity and selectivity for multi-carbon (C 2+ ) products on copper-based catalysts at ampere-level current densities is important for advancing industrial electrochemical CO 2 reduction reaction (eCO 2 RR). However, oxidative copper species are prone to reduction to metallic copper at high reduction potentials, causing the decline of selectivity and stability for C 2+ products. Herein, we report that Cucurbit[6]uril (CB[6])-modified copper nanoparticles promote eCO 2 RR via stabilizing Cu + sites at ampere-level current densities. The Cu-CB[6]-3 catalyst exhibited the highest C 2+ productivity with a faradaic efficiency of 72.2 ± 1.0 % at a current density of 1.0 A cm −2 , and the corresponding potential was −1.2 V vs. RHE. Detailed systematical spectroscopic analyses revealed that the main reason for boosting the C–C coupling is that the strong coordination interaction and molecular-level confinement of CO 2 and reaction intermediates of CB[6] can not only stabilize Cu + at higher current densities, but also accelerate the reaction kinetics. Simultaneously, the hydrophobic inner cavity and hydrophilic outer surface of CB[6] molecules ensure the smooth progress of eCO 2 RR while suppressing the hydrogen evolution reaction, resulting in high C 2+ selectivity and long-term stability. This work provides an approach to design highly efficient catalysts for industrial eCO 2 RR.
研究领域:
催化
·
电化学
·
材料科学
·
化学工程
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
Applied Materials Today
·
2025
·
IF 6.9
Zhenyu Li,Lingling Zhang,Yafei Chen,Xueyong Zheng,Chunli Jiang,Chunhua Luo,Hechun Lin,Hui Peng
The limitations of von Neumann architectures in computational speed and energy efficiency have driven the development of neuromorphic computing systems, where optoelectronic synaptic devices play a pivotal role in enabling brain-inspired information processing. This study presents an optoelectronic synaptic device based on a two-dimensional conductive metal-organic framework material Cu-BHT which exhibits broad visible-light absorption (300 - 600 nm), high photoconductivity, and solution processability. The fabricated device with a planar structure of Ag/Cu-BHT/Ag successfully simulates the key biological synaptic functionalities, including excitatory postsynaptic current (EPSC), paired-pulse facilitation (PPF), and short-to-long-term memory transitions. The device achieves a high accuracy of 96.3% in MNIST handwritten digit recognition using a convolutional neural network (CNN). Furthermore, multi-wavelength response of the device enables optical logic operations (AND/OR) and associative learning paradigms, such as Pavlovian conditioning experiment. This work underscores Cu-BHT as a versatile material for neuromorphic computing and artificial visual systems, with future research exploring scalable fabrication and hybrid integration to realize adaptive vision platforms with enhanced energy efficiency.
研究领域:
神经形态工程
·
光电子学
·
材料科学
·
人工智能
·
神经网络
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产品关联
DOI
高影响因子
JOURNAL OF POWER SOURCES
·
2022
·
IF 9.794
Yixuan Zhang,Guoqiang Liu,Chang Su,Guangyin Liu,Hongda Sun,Danlei Qiao,Lei Wen
This work focuses on the improvement on the electrochemical performances of Fe–Mn based oxides as cathode for sodium ion batteries by doping Cu and F elements. The synthesized doped-compounds exhibit extremely excellent electrochemical performance. For instance, it's initial discharge capacity can reach 195.6 mAh g −1 at a current density of 10 mA g −1 . Meanwhile, after 200 cycles at 200 mA g −1 , it still remains a capacity of 124.1 mAh g −1 , 87.8% of the initial capacity of 141.3 mAh g −1 . More significantly, it can deliver a high capacity of 106.4 mAh g −1 at a high current density of 1000 mA g −1 . It is found that F/Cu co-substitution obviously improve the discharge capacity and cycle stability of Fe–Mn based oxide especially at higher current densities. Doping Cu and F elements has influence on the structure and morphology of the material, which results in the improvement of charge-discharge characteristics.
研究领域:
材料科学
·
电化学
·
能源存储
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DOI
高影响因子
AICHE JOURNAL
·
2019
·Vol. 66
·期 1
·e16746
·
IF 3.463
Chao Bian,Yin-Ning Zhou,Zheng-Hong Luo
Controlled radical polymerization (CRP) under external field has been an attractive research area in these years. In this work, a new electron transfer mechanism, that is, sonochemically induced electron transfer (SET) was introduced to mediate polymerization for the first time. The activator Cu I X/L complex was (re)generated from Cu II X 2 /L in dimethylsulfoxide (DMSO) by the SET process in the presence of free ligand tris(2-dimethylaminoethyl)amine (Me 6 TREN). The investigation of polymerization including the mechanistic insights and effect of experimental conditions on the rate of reaction has been undertaken. Kinetics of Cu(II)-catalyzed CRPs via SET under different conditions (i.e., Me 6 TREN concentration, catalyst loading, targeted degree of polymerization, and sonication power) were conducted in an unprecedentedly controlled manner, yielding polymers with predetermined molar masses and low dispersities ( Đ < 1.12). Attractively, the polymerization can be performed without the piezoelectric nanoparticles and exogenous reducing agent. Contamination by nonliving chains formed from sonochemically generated radicals is avoided as well. All of these results supported that Cu(II)-based catalyst activation enabled by ultrasonication has a promising potential in scale-up of CRP.
研究领域:
高分子化学
·
材料科学
·
化学工程
✓ 已验证
DOI
高影响因子
CHEMICAL ENGINEERING SCIENCE
·
2025
·
IF 4.3
Shaonan Shan,Mai Wei,Liwei Ma,Youqian Wang,Guoqiang Li,Guojie Zhang
Formaldehyde, as a common pollutant in industrial exhaust gases, poses a serious threat to human health due to its highly toxic nature. Therefore, the development of efficient catalysts for formaldehyde removal is of great environmental significance. The accumulation of by-salts in the desulfurization waste stream of coking industry has become a major challenge in environmental protection. This paper used the by-salt ammonium thiocyanate as a precursor to prepare Cu-based g-C 3 N 4 (CN) by impregnation pyrolysis method, and applied it to the efficient catalytic oxidation of formaldehyde. The results showed that CN/Cu-10 %-a exhibited the best catalytic performance, with its specific surface area increasing 2.07 times compared to pure CN. The formaldehyde removal rate reached 98 %, which is 7.38 times higher than before modification, and it decreased by only 7.91 % after six cycles, demonstrating excellent cyclic stability. The improved photocatalytic performance is due to Cu doping, which increases the number of active sites, boosts visible light absorption, and facilitates the separation and transfer of photogenerated carriers. The secondary calcination further optimized the close contact between the metal Cu ions and the semiconductor interface, enhanced the specific surface area and the electron transfer efficiency to the metal Cu ions, and suppressed the charge carrier recombination. This study provides a new strategy and theoretical basis for the resourceful utilization of desulfurization waste liquid and the efficient degradation of formaldehyde.
研究领域:
环境科学
·
催化
·
材料科学
·
化学工程
·
光催化降解
✓ 已验证
产品关联
DOI
高影响因子
Nano Research
·
2023
·Vol. 17
·期 5
·4437-4443
·
IF 9.9
Zhong Junsen,Huang Bingkun,Yang Kunjie,Ma Zuju,Du Lingyu,Luo Ning,Tang Fengjiao,Hou Chuanxin,Jiang Fuyi,Kang Litao
The electrochromic (EC) mechanisms of inorganic materials are usually based on reversible cation insertion/extraction or metal deposition/dissolution, which are plagued by ion trapping and dendrite growth, respectively. In this paper, a novel conversion-type electrochromic mechanism is proposed, by making good use of the CuI/Cu redox couple. This CuI-based electrochromic system shows a neutral color switching from transparent and dim grey. By simply increasing the bleaching voltage, \({{\rm{I}}_3}^ - /{{\rm{I}}^ - }\) redox couple can be further activated. The generated \({{\rm{I}}_3}^ - \) will readily react with Cu, effectively improving the conversion reversibility and thereby rejuvenating the degraded electrochromic performance. Thanks to the well-designed electrode and the self-healing ability, this conversion electrochromic system achieves rapid response times ( t coloring : 23 s, t bleaching : 6 s), decant optical modulation amplitude (26.4%), high coloration efficiency (86.15 cm 2 ·C −1 ), admirable cyclic durability (without performance degradation after 480 cycles) and excellent optical memory ability (transmittance variation < 1% after 10 h open-circuit storage). The establishment of this conversion-type electrochromism may inspire the exploration of novel electrochromic materials and devices.
研究领域:
材料科学
·
电化学
·
纳米技术
·
智能材料
·
能量存储与转换
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）