Nanomaterials
·
2020
·Vol. 10
·期 11
·2170
·
IF 4.324
Jialing Chen,Gang Peng,Tingyu Liang,Wenbo Zhang,Wei Zheng,Haoran Zhao,Li Guo,Xiaoqin Wu
The NH3-SCR activities and hydrothermal stabilities of fivexCu/MCM-22 zeolites with different Cu loadings (x= 2–10 wt%) prepared by incipient wetness impregnation method were systematically investigated. The physicochemical properties ofxCu/MCM-22 zeolites were analyzed by XRD, nitrogen physisorption, ICP-AES, SEM, NH3-TPD, UV-vis, H2-TPR and XPS experiments. The Cu species existing inxCu/MCM-22 are mainly isolated Cu2+, CuOxand unreducible copper species. The concentrations of both isolated Cu2+and CuOxspecies inxCu/MCM-22 increase with Cu contents, but the increment of CuOxspecies is more distinct, especially in high Cu loadings (>4 wt%). NH3-SCR experimental results demonstrated that the activity ofxCu/MCM-22 is sensitive to Cu content at low Cu loadings (≤4 wt%). When the Cu loading exceeds 4 wt%, the NH3-SCR activity ofxCu/MCM-22 is irrelevant to Cu content due to the severe pore blockage effects caused by aggregated CuOxspecies. Among the fivexCu/MCM-22 zeolites, 4Cu/MCM-22 with moderate Cu content has the best NH3-SCR performance, which displays higher than 80% NOxconversions in a wide temperature window (160–430 °C). Furthermore, the hydrothermal aging experiments (xCu/MCM-22 was treated at 750 °C for 10 h under 10% water vapor atmosphere) illustrated that all thexCu/MCM-22 zeolites exhibit high hydrothermal stability in NH3-SCR reactions.Keywords:Cu/MCM-22;NH3-SCR;Cu loading;hydrothermal aging
研究领域:
催化化学
·
环境科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF MOLECULAR LIQUIDS
·
2018
·
IF 4.513
Xin Jiang,Hongying Xia,Libo Zhang,Song Cheng,Qi Zhang,Quan Chen,Wenhai Hu
To enhance the photocatalytic performance of Cu 2 O, the spent activated carbon (SAC) directly supported CuO powder and then was heated by microwaves to prepare an economical photocatalyst copper-loaded activated carbon (Cu/AC). The prepared Cu/AC catalyst was characterized by N 2 adsorption-desorption, X-ray diffraction (XRD), scanning electron microscopy (SEM), energy dispersive spectrometry (EDS), X-ray photoelectron spectroscopy (XPS), Raman spectroscopy and the zero charge point (pH pzc ). The analysis results indicated that Cu/AC had an important specific surface area of 1135 m 2 /g and mainly contained Cu 2 O and metallic copper (Cu 0 ). The Cu 2 O particles were successfully loaded on the activated carbon. The photocatalytic activity of prepared Cu/AC was evaluated by means of methylene blue (MB) degradation. The effects of reaction parameters such as the pH, initial concentration and dose of Cu/AC were investigated for dye degradation . The data showed that the MB solutions were degraded using Cu/AC under UV irradiation . These results indicated that the Cu/AC photocatalyst may be conceived as a method for the treatment of dye wastewater.
研究领域:
环境科学
·
材料科学
✓ 已验证
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2025
·
IF 8.2
Yingxue Sun,Shuai Liu,Huaiqiu Chang,Jianjun Liu,Lingyu Piao
The efficient conversion of methane (CH4) to high-value-added chemicals using a photocatalyst at room temperature and pressure faces great challenges compared to harsh reaction conditions. However, achieving this efficient conversion would yield substantial cost advantages and hold immense potential for development. Here, we demonstrate the enhanced photocatalytic conversion efficiency of CH4 at room temperature and pressure conditions without requiring any oxidant through the construction of a bimetal Ag–Cu-loaded brookite TiO2 photocatalyst. The C1 products were ultimately obtained with 100% selectivity and a yield of 936 μmol·g–1·h–1. The performance exceeds that of similar research by tens of times. The high selectivity of this system is attributed to the optimal number of ·OH, which strikes a balance between excess and deficiency. Ag effectively enhances electron transport in the photocatalytic reaction process on a dual active site photocatalyst, while Cu significantly improves the selectivity of the C1 products. In this system, the hydroxyl radical (·OH) activates CH4 to generate the methyl radical (·CH3), which then binds with the lattice oxygen of TiO2, breaking the Ti–O bond and resulting in the formation of *OCH3. The *OCH3 undergoes further conversion to CH3OH, which is subsequently oxidized to HCHO by ·OH. This work presents a cost-effective and highly efficient approach for directly oxidizing CH4 into valuable chemicals, ensuring superior selectivity.
研究领域:
化学工程
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环境科学
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材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
BIORESOURCE TECHNOLOGY
·
2023
·
IF 11.4
Qiaozhi Zhang,Yuqing Sun,Weijian Xu,Yang Cao,Chunfei Wu,Chi-Hwa Wang,Daniel C.W. Tsang
Microwave (MW)-assisted catalytic degradation of organic pollutants draws increasing attention owing to its high efficiency in wastewater treatment. This work developed Cu-loaded biochar (CuBC) catalysts for time-efficient mineralization of refractory and high-concentration oxytetracycline (OTC). With only 1 min at 80 °C, Na 2 S 2 O 8 achieved 100% total organic carbon (TOC) removal over the Cu5BC, while NaClO mineralized 73.3% TOC over the metal-free BC, in contrast to a relatively low mineralization efficiency (< 35%) achieved by H 2 O 2 . The high efficiency in MW-assisted oxidation systems could be ascribed to reactive oxidizing species ( • SO 4 − or • ClO), which otherwise were barely detectable in a conventional heating system. The interactions between CuBC and MW were revealed by correlating the physiochemical characteristics to the MW absorption ability. The proposed catalytic systems can contribute to the development of a high-throughput and low-carbon wastewater treatment technology.
研究领域:
环境科学
·
废水处理技术
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产品关联
DOI
PubMed
高影响因子
Journal of Materials Chemistry A
·
2022
·Vol. 10
·期 20
·11268-11276
·
IF 14.511
Jiabao Guo,Yizhuo Zhao,Peng Wang,Yang Song,Yifei Shao,Li Zhu,Xiaoquan Yao
Catalytic selective cleavage reaction of the C(sp3)–C(sp3) bond has received little attention, despite its importance in organic synthesis and biochemistry. Herein, a novel copper loaded nitrogen-rich mesoporous carbon nitride material was designed and synthesized, and utilized as a highly efficient photocatalyst for the inert C–C bond cleavage of amines under blue light irradiation. With oxygen as a benign oxidant, good to excellent yields were achieved for various functionalized amines at room temperature, even including sluggish aliphatic amines. The method may provide a cost-effective and environmentally friendly alternative for the direct oxidative cleavage of amines.
研究领域:
有机合成
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光催化化学
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材料科学
✓ 已验证
DOI
高影响因子
Surfaces and Interfaces
·
2021
·
IF 4.837
Sixun Niu,Xiaobin Dong,Weifen Zhang,Xiansong Li,Shiquan Liu
SiO 2 -Cu x O composites may have potential applications in antibacterial and dye degradation . However, it is still a challenge to prepare SiO 2 -Cu x O films with well crystallized Cu x O nanoparticles and high Cu/Si molar ratios under alkaline condition at relatively low temperature. Herein, by using PVP stabilized alkaline silica sol and ethanolic solution of copper acetate, a series of SiO 2 -Cu x O composite films with high Cu/Si molar ratios were successfully prepared via a facile two-step process of dip coating and annealing. The microstructure and crystalline phase of the composite films were finely controlled by changing the amount of PVP, the concentration of copper solution and the calcination temperature. The results showed that film prepared with 1 mol/L copper acetate solution and calcined at 500 °C exhibited the best antibacterial activity , adsorption and photocatalytic performance toward methylene blue in solutions. The prepared films could be conveniently used in antibacterial field and the treatment of organic wastewater.
研究领域:
材料科学
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环境科学
·
微生物学
✓ 已验证
产品关联
DOI
高影响因子
Water
·
2022
·Vol. 14
·期 7
·1007
·
IF 3.53
Xudong Cheng,Xiaoping Zhang,Shaoqi Zhou,Lin Shi
For the treatment of 2-naphthol wastewater, the homogeneous electro-Fenton process was considered as an effective method but some disadvantages greatly restrict its application. The three-dimensional electro-Fenton (3D-EF) system using a nano zero-valent iron-supported biochar (NZVIs-BC) particle electrode and a Cu-supported stainless steel electrode (Cu-SSE) was proposed to avoid the disadvantages of the homogeneous electro-Fenton. In this work, the 3D-EF system was developed, which consisted of a Cu-SSE (cathode), a graphite rod (anode) and a NZVIs-BC particle electrode. The effect of the ratio of ferrous sulfate heptahydrate (FS) to rice straw (RS), CuSO4•5H2O amount, initial pH of 2-naphthol wastewater and current intensity (the output current of the power supply) on the removal rate of 2-naphthol were investigated. It is noteworthy that more than 98.36% of the 2-naphthol in aqueous solution was removed by the 3D-EF system, and only about 60.09% of 2-naphthol was removed by the homogeneous electro-Fenton system. Furthermore, naphthalene, benzoic acid, β-naphthoquinone, 1, 2-naphthalenedione, phenol and aromatic hydrocarbon were the main degradation products of 2-naphthol by the 3D-EF system; the toxicity of 2-naphthol wastewater was also greatly reduced.Keywords:electro-Fenton;Cu-supported stainless steel electrode;nano zero-valent iron-supported biochar;2-naphthol wastewater
研究领域:
环境科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
Regenerative Biomaterials
·
2020
·Vol. 7
·期 2
·153-160
·
IF 4.882
Zhou Lei,Li Xin,Wang Kebing,Shen Fangyu,Zhang Lu,Li Peichuang,Shang Tengda,Wang Jin,Huang Nan
NO is the earliest discovered gas signal molecule which is produced by normal healthy endothelial cells, and it has many functions, such as maintaining cardiovascular homeostasis, regulating vasodilation, inhibiting intimal hyperplasia and preventing atherosclerosis in the blood system. Insufficient NO release is often observed in the pathological environment, for instance atherosclerosis. It was discovered that NO could be released from the human endogenous NO donor by many compounds, and these methods can be used for the treatment of certain diseases in the blood system. In this work, a series of copper-loaded polydopamine (PDA) coatings were produced through self-polymerization time for 24, 48 and 72 h. The chemical composition and structure, coating thickness and hydrophilicity of the different copper-loaded PDA coatings surfaces were characterized by phenol hydroxyl quantitative, X-ray photoelectron spectroscopy, ellipsometry atomic force microscopy and water contact angles. The results indicate that the thickness and the surface phenolic hydroxyl density of the PDA coatings increased with the polymerization time.This copper-loaded coating has glutathione peroxidase-like activity, and it has the capability of catalyzing NO releasing from GSNO. The surface of the coating showed desirable hemocompatibility, the adhesion and activation of platelets were inhibited on the copper-loaded coatings. At the same time, the formation of the thrombosis was also suppressed. These copper-loaded PDA coatings could provide a promising platform for the development of blood contact materials.
研究领域:
生物医学工程
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材料科学
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心血管医学
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产品关联
DOI
PubMed
高影响因子
MICROPOROUS AND MESOPOROUS MATERIALS
·
2022
·
IF 5.876
Yanping Sun,Jie Yu,Xiaohui Zhan,Lei Chen,Yue Zhao,He Wang,Huixiang Shi
In this study a copper-loaded N-doped carbon catalyst with mesoporous hollow sphere structure characteristic (Cu–NCHS) was prepared by in-situ synthesis followed with calcination and hydrothermal etching. Its catalytic performance for peroxymonosulfate (PMS) activation was evaluated using bisphenol A (BPA) as target pollutant. Owing to the coordination of more active sites provided by copper-loading and the mesoporous hollow structure characterized with high specific surface area (SSA) of 282.2 m 2 g −1 and large pore volume of 0.831 cm 3 g −1 , Cu–NCHS showed significantly better catalytic performance in BPA degradation (96.8% within 120 min) than those of NCHS (16.4%) and Cu-NC (19.6%) under the same initial conditions of BPA (20 mg L −1 ), PMS (100 mg L −1 ) and catalyst dosage (50 mg L −1 ). The possible mechanism of PMS activation by Cu–NCHS was also explored by ESR analysis and quenching experiments, and both radical and non-radical pathways were confirmed to be involved in BPA degradation process in Cu–NCHS/PMS system. Singlet oxygen ( 1 O 2 ), hydroxyl radical (•OH) and sulfate radical (SO 4 •− ) were identified to be the reactive oxygen species (ROS), of which 1 O 2 was the dominant ROS. Besides, the Cu–NCHS/PMS system showed excellent adaptability to pH change (from 3 to 11), common inorganic anions (Cl − , HCO 3 − , HPO 4 2− , SO 4 2− ) and natural organic matter (humic acid) in water. Meanwhile, the Cu–NCHS catalyst also showed good stability (with low Cu leaching of 0.14 mg L −1 ) and well reusability in recycling tests (the removal rate of BPA dropped by 14.0% after four successive runs). Combined with the experimental results in actual water (river water and wastewater), we demonstrated this study might provide a new insight for developing copper-loaded catalyst with high effect toward water treatment.
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
CHINESE JOURNAL OF CATALYSIS
·
2016
·
IF 2.628
Jixing Liu,Jian Liu,Zhen Zhao,Weiyu Song,Yuechang Wei,Aijun Duan,Guiyuan Jiang
A series of meso-microporous copper-supporting chabazite molecular sieve (Cu-SAPO-34) catalysts with excellent performance in low-temperature ammonia selective catalytic reduction (NH 3 -SCR) have been synthesized via a one-pot hydrothermal crystallization method. The physicochemical properties of the catalysts were characterized by scanning electron microscopy, transmission electron microscopy , N 2 adsorption-desorption measurements, X-ray diffraction, 27 Al magic angle spinning nuclear magnetic resonance , diffuse reflectance ultraviolet-visible spectroscopy, inductively coupled plasma-atomic emission spectroscopy, X-ray photoelectron spectroscopy , temperature-programmed reduction measurements, and electron paramagnetic resonance analysis. The formation of micro-mesopores in the Cu-SAPO-34 catalysts decreases diffusion resistance and greatly improves the accessibility of reactants to catalytic active sites. The main active sites for NH 3 -SCR reaction are the isolated Cu 2+ species displaced into the ellipsoidal cavity of the Cu-SAPO-34 catalysts.
研究领域:
材料化学
·
环境催化
·
多孔材料
·
工业催化
·
能源与环境科学
✓ 已验证
DOI
高影响因子
ChemCatChem
·
2021
·Vol. 13
·期 15
·3461-3469
·
IF 5.686
Hualei Hu,Tingting Xue,Zhenxin Zhang,Jiang Gan,Liangqi Chen,Jian Zhang,Fengzuo Qu,Weijie Cai,Lei Wang
Graphical Bifunctional catalyst : The highly-efficient conversion of 5-hydroxymethylfurfural (HMF) to 2,5-bis(ethoxymethyl)furan (BEMF) was achieved by using the copper-loaded hierarchically structured ZSM-5 (Cu/HSZ) catalysts in the continuous fixed-bed reactor. The highly-efficient conversion of 5-hydroxymethylfurfural (HMF) to 2,5-bis(ethoxymethyl)furan (BEMF) was achieved over the copper-loaded hierarchically structured ZSM-5 (Cu/HSZ) catalysts in the continuous fixed-bed reactor. The main reaction path for BEMF synthesis on the Cu/HSZ catalysts was confirmed as following: HMF was firstly hydrogenated to BHMF intermediates over metal sites and then the formed BHMF was etherified by acid sites. Benefiting from the ammonia evaporation (AE) method promoted the dispersion of copper and reduced the acidity, the Cu/HSZ-AE catalyst exhibited more excellent BEMF yield and stability than the catalyst prepared by conventional incipient-wetness impregnation (Cu/HSZ-IW). Indeed, the inactivation of Cu/HSZ-IW catalyst was mainly attributed to the deactivation of copper by carbon species deposition.
研究领域:
化学工程
·
催化科学
✓ 已验证
产品关联
DOI
高影响因子
Acta Biomaterialia
·
2020
·
IF 7.242
Meifei Lian,Yu Han,Binbin Sun,Ling Xu,Xiaofeng Wang,Bing Ni,Wenbo Jiang,Zhiguang Qiao,Kerong Dai,Xiuyin Zhang
The guided bone regeneration (GBR) concept has been extensively utilized to treat maxillofacial bone defects in clinical practice. However, the repair efficacy of currently available GBR membranes is often compromised by their limited bone regeneration potential and deficient antibacterial activity . In this study, inspired by the bi-layered structure design of the commonly used Bio-Gide Ⓡ membrane, we designed and fabricated a new kind of multifunctional bi-layered “GBR scaffold” combining solution electrospinning writing (SEW) and solution electrospinning (SES) techniques using a single SEW printer. Copper-loaded mesoporous silica nanoparticles ( [email protected] ) were incorporated into the poly(lactic-co-glycolic acid)/gelatin (PLGA/Gel, denoted as PG) fiber matrix to construct a composite [email protected] fibrous scaffold. The obtained GBR scaffold consisted of a loose and porous SEW layer to support and facilitate bone ingrowth, and a dense and compact SES layer to resist non-osteoblast interference. The resulting enhanced mechanical properties, coordinated degradation profile, and facile preparation procedure imparted the composite scaffold with good clinical feasibility. In vitro biological experiments indicate that the [email protected] composite scaffold exhibited favorable osteogenic and antibacterial properties. Furthermore, an in vivo rat periodontal defect model further confirmed the promising bone regeneration efficacy of the [email protected] scaffold. In conclusion, the developed electrowritten [email protected] bi-layered scaffold with hierarchical architecture and concurrent osteogenic and antibacterial functions may hold great potential for application in GBR.
研究领域:
生物材料
·
组织工程
·
牙科材料
·
生物医学工程
✓ 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）