ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
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2020
·Vol. 27
·期 22
·27663-27673
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IF 3.056
Liu Yuan-zhen,Xu Qi-yan,Guo Rui-tang,Duan Chao-peng,Wu Gui-lin,Miao Yu-fang,Gu Jing-wen
The Cu/TiO 2 catalysts with the addition of Eu were developed by the sol-gel way for the selective catalytic reduction (SCR) of NO x by NH 3 . Activity tests revealed that CuEu/TiO 2 -0.15 catalyst showed the optimal de-NO x performance in a wide temperature range (150–300 °C), along with an admirable SO 2 tolerance. According to characterization analysis, the relationship between the NH 3 -SCR performance and physicochemical characters of samples was explored. The adjunction of Eu on Cu/TiO 2 catalyst can contribute to the formation of a large amount of Cu 2+ , adsorbed oxygen, and acid sites on the catalyst surface. Moreover, the Eu addition on Cu/TiO 2 is favorable to the generation of activated NO x and NH 3 substances adsorbed on the catalyst surface, which would conduce to the NH 3 -SCR process by Langmuir-Hinshelwood (L-H) mechanism effectively.
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ECOTOXICOLOGY AND ENVIRONMENTAL SAFETY
·
2020
·
IF 4.872
Yupeng Wang,Qintie Lin,Rongbo Xiao,Shuailong Cheng,Haoyu Luo,Xiaoqing Wen,Libin Wu,Quanfa Zhong
This study investigated the application of a specific soil washing method to remove Cu and Pb from contaminated agricultural soil. To develop an efficient leaching agent of heavy metal compounds for use in farmland soil, a mixed chelator (MC) was prepared using potassium fulvic acid (PFA, 3.2%) and citric acid (CIT, 0.16 M) in a volume ratio of 4:1 (PFA:CIT = 4:1); the optimal solid-liquid ratio (S/L = 1:20), initial pH value (4.51) and contact time (360 min) were also explored. Under optimal conditions, the removal efficiencies of MC for Cu and Pb were 42.92% and 50.46%, respectively, both of which performed better than PFA (27.86% of Cu and 17.91% of Pb) and CIT (42.04% of Cu and 41.46% of Pb). The effective states, bioavailability and relative mobilities of Cu and Pb in soil were also efficiently reduced by MC, which also increased the stability of these elements, thereby lowering the risk to soil health. More importantly, MC not only had little effect on the soil physicochemical properties (e.g., pH, organic matter (OM), cation exchange capacity (CEC), ammonium nitrogen (AN), available phosphorus (AP) and rapidly available potassium (AK)), but also improved the restored soil. Furthermore, soil structure, surface elements and the enzyme activity did not exhibit significantly loss. Therefore, MC has great potential for remediating agricultural soil.
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VACUUM
·
2020
·
IF 2.906
Qiao Zhang,Yu Cheng,Baojiang Chen,Shuhua Liang,Longchao Zhuo
W–Cu composites that are strengthened with tungsten carbide ceramic particles have been proposed thanks to their high melting point, high hardness and excellent high-temperature mechanical properties . In this paper, tungsten carbide-reinforced W-25 wt% Cu composites were fabricated via an in situ synthesis technique that used mixed tungsten, copper and graphite powders. The impact of the graphite content on the microstructure and properties of the W–Cu composite was investigated. The results showed that tungsten carbide phases formed through the carbonization reaction of tungsten and graphite at high temperature. With the generation of tungsten carbide phases, the hardness, vacuum arc erosion resistance, high-temperature strength and wear resistance of the W–Cu composites were improved. The improvement was very significant for the W–Cu composites with an increase in the graphite content. However, the electrical conductivity was slightly sacrificed for the W–Cu composites. Moreover, the effects of the graphite on the comprehensive properties were evaluated and compared with those of reinforced with CNTs . Based on the laboratory properties and preparation cost of W–Cu composites, graphite can be used for the industrial fabrication of in situ self-generated tungsten carbide-reinforced W–Cu composites.
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CHEMICAL ENGINEERING JOURNAL
·
2019
·
IF 8.355
Meng Li,Juan Zhou,Yong-Guang Bi,Shao-Qi Zhou,Ce-Hui Mo
Microbial fuel cell (MFC) is a novel electrochemical technique that can produce bioelectricity by electro-active bacteria, while the bioelectricity depends greatly on electrochemical activity of cathode catalyst. Here, some effective transition metal composites are synthesized by a facile hydrothermal method, and these composites are used as oxygen reduction electrocatalyst for enhancing power output in air cathode MFC . A series of structural characterizations suggest that CoN@C possesses abundant oxygen vacancies and pyridinic-N. Linear sweep voltammetry (LSV) analysis demonstrates CoN@C can take part in oxygen reduction reaction (ORR) through a 4e- transfer pathway. At a loading amounts of 5 mg cm −2 , CoN@C cathode can achieve the maximum power density (1202.3 ± 18.6 mW m −2 ), which is 1.09 times higher than that of commercial Pt/C (1104.1 ± 24.7 mW m −2 ). High power output of CoN@C-5 is ascribed to the introduction of pyridinic-N, abundant oxygen vacancies, and large electrochemical active area. Consequently, CoN@C composite is an effective cathode electrocatalyst to replace precious Pt/C for MFC application.
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Journal of CO2 Utilization
·
2019
·
IF 5.189
Qingqing Li,Xurui Zhang,Xiaodong Zhou,Qingyu Li,Hongqiang Wang,Jin Yi,Yuyu Liu,Jiujun Zhang
Electrocatalytic CO 2 reduction to produce low-carbon chemicals/fuels is one of the most important approaches for CO 2 emissions reduction and utilization. However, the insufficient catalytic activity, stability and selectivity of the electrocatalysts have been identified to be a major challenge. In this work, novel Bi-MWCNT-COOH/Cu catalysts are prepared via a facile co-electrodeposition technique on copper foil to obtain catalyst electrodes for selectively electro-catalyzing CO 2 reduction to produce formic acid (HCOOH). The as-prepared electrodes exhibited high catalytic activity, stability and selectivity toward the production of HCOOH. The faradaic efficiency for HCOOH production can reach values up to 91.7 % at ―0.76 V vs. RHE, with no obvious degradation after 12 h of continuous electrolysis. The proposed electrodeposition technique to produce composite catalyst electrodes is characterized by simplicity, rapidity, and cost-effectiveness, being promising for scaled-up industrial applications.
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Soft Matter
·
2019
·Vol. 15
·期 47
·9727-9732
·
IF 3.399
Guanzhou Luo,Li Wang,Xinying Li,Kai Yang,Yongle Luo,Shouping Xu,Pihui Pi,Xiufang Wen
A facile method that combines alkali-assisted oxidation and –SH chelation with a click chemistry reaction was employed to create an F-POSS polymer surface (fluorinated octavinyl polyhedral oligomeric silsesquioxane polymer)-based Cu mesh (F-POSS-OM). The as-prepared F-POSS-OM surface displayed a cohering hierarchical nano-F-POSS polymer granule/micro-Cu(OH)2 wire structure, which provided a re-entrant geometry needed for liquid-repellency and low liquid sliding angles (<15°). Moreover, the easy-prepared structure endows the F-POSS-OM with remarkable durability for mechanical and chemical damages, including wear abrasion, tape-peeling, 100 cm-height hammer impact, severe hand twisting, strong acid/base/salt solutions, and high temperatures. Importantly, F-POSS-OM still retained excellent self-cleaning performance even after being subjected to these damages.
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Coatings
·
2019
·Vol. 9
·期 12
·867
·
IF 2.33
Diping Zeng,Zhiyi Liu,Song Bai,Jian Wang
In the present work, a coating was prepared on an Al alloy substrate by plasma electrolytic oxidation (PEO). To seal the micro defects in the oxide scale, a siloxane layer was prepared on the PEO coating by sol gel method. The polymer sealant was synthesized from Tetraethoxy silane (TEOS) and methacryloxy propyl trimethoxyl silane (MPTES). The chemical structure of the polymer was studied by Fourier transform infrared spectroscopy (FTIR). The morphologies and microstructure of the PEO coating and siloxane coating were investigated by scanning electron microscopy (SEM). The results showed that siloxane formed a continuous layer on the surface and effectively sealed the micro defects. The corrosion behavior of the coatings in three different corrosion solutions (NaCl, HCl, and NaOH) was examined by electrochemical impedance spectroscopy and potentiodynamic polarization. The corrosion resistance of the sealed coatings was superior to that of the PEO coating because it prevented the penetration of corrosive solutions. The corrosion resistance of the sealed coatings was found to decrease with increasing electrolyte concentration. The work demonstrated that siloxane sealing may greatly enhance the corrosion resistance of Al-based PEO coating in acidic, neutral, and alkaline environments.Keywords:PEO coating;silane polymer;sealing treatment;corrosion resistance
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RSC Advances
·
2019
·Vol. 9
·期 52
·30439-30447
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IF 3.049
Yongsheng Wang,Zhenzhen Zhao,Yunlu Zhao,Xiaolin Lan,Weixiang Xu,Li Chen,Dongjie Guo,Zhengkang Duan
The sintering resistance of supported Cu nanoparticle (NP) catalysts is crucial to their practical application in the dehydrogenation of diethanolamine (DEA). In this paper, co-precipitation, hydrothermal synthesis, and sol–gel condensation are used to form a new support material through chemical bonding between graphene oxide and ZrO2. The composite carriers prepared by the three methods are mixed with copper nitrate and ground using a ball mill. A series of Cu/ZrO2-reduced graphene oxide (RGO) composites were prepared by calcination under nitrogen at 450 °C for 3 h and hydrogen reduction at 250 °C for 4 h. The conversion of DEA to iminodiacetic acid (IDA) reached 96% with the Cu/ZrO2-RGO catalyst prepared by hydrothermal synthesis. The conversion rate of DEA is more than 80% following the reuse of the CZG-2 catalyst for twelve cycles. The various physicochemical characterization techniques show that the Cu/ZrO2-RGO layered and wrinkled nanostructures can improve catalytic stability and suppress the sintering of the supported Cu NPs during the catalytic dehydrogenation of diethanolamine. A synergistic effect between the RGO and the Cu nanoparticles is observed. The Cu nanoparticles with RGO have a better dispersibility, and a new nano-environment is created, which is the key to improving the efficiency of diethanolamine dehydrogenation. These new Cu/ZrO2-RGO catalysts show increased durability compared to commercially produced Cu/ZrO2 catalysts and show promise for practical applications involving diethanolamine dehydrogenation.
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Biomaterials Science
·
2022
·Vol. 11
·期 1
·322-338
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IF 7.59
Jianwen Zhang,Xianlan Ke,Maotao Huang,Xinyu Pei,Shuai Gao,Dimeng Wu,Junying Chen,Yajun Weng
The anticoagulation and antibacterial functions of implant and interventional catheters during indwelling will determine their success or failure. Here, an amino-containing copper-based metal–organic framework (Cu-MOF) coating was prepared on the thermoplastic polyurethane substrate (TPU) surface by spin coating for anti-thrombotic and anti-infection effects. The adhesion properties of the polyurethane prepolymer coating (PC) enhanced the binding force of Cu-MOF particles and TPU surface and improved stability. Due to the coordination affinity of Cu2+ with nitric oxide (NO) and the NO loading capacity of the amino group, it showed that a large amount of NO was loaded in the coating. Meanwhile, the coordinated Cu2+ in the coating also catalyzed endogenous NO donors to generate NO, which prolonged the NO release for up to 30 days. The results of antibacterial experiments showed that the NO released from the coating had good antibacterial effects on both E. coli and S. epidermidis. An obvious antibacterial ring can be seen and the antibacterial rate was higher than 96%. It also showed inhibiting platelet adhesion and activation, prolonged in vitro clotting time and inhibited thrombus formation. In summary, for the first time, NO release from the coating was realized by the combined ways of NO donor and catalytic endogenous NO donor. It can not only meet the high NO release rate required for early anticoagulation and antibacterial of the catheter but also maintain normal anticoagulation requirements in the later period.
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ANALYTICA CHIMICA ACTA
·
2022
·
IF 6.911
Qinqin Yang,Xipeng Cui,Ying Qin,Tiantian Lei,Yu He,Gongwu Song
MXene-based nanozymes have increased research enthusiasm in the field of food safety and environment monitoring. Herein, the Cu NCs/Ti 3 C 2 NSs nanocomposites were prepared by modifying copper nanoclusters (Cu NCs) on the surface of Ti 3 C 2 nanosheets (NSs) with a simple two-step method. The Cu NCs/Ti 3 C 2 NSs nanocomposites had outstanding tetraenzyme mimic activities, i.e. peroxidase (POD)-mimics, catalase (CAT)-mimics, ascorbic acid oxidase (AAO)-mimics and superoxide dismutase (SOD)-mimics. Modification of Cu NCs on Ti 3 C 2 NSs can enhance tetraenzyme mimic activities because of the synergistic catalytic effect between Cu NCs and Ti 3 C 2 NSs. The catalytic mechanism and steady-state kinetics of Cu NCs/Ti 3 C 2 NSs were also investigated. Based on the POD-mimic activity of Cu NCs/Ti 3 C 2 NSs, a simple and rapid colorimetric method was established for the on-site detection of hypoxanthine (Hx), with the linear range of 5–200 μM and limit of detection (LOD) was 0.25 μM. The visible color change with the increase of Hx concentration can be recognized by a smartphone APP to transfer the red (R), green (G) and blue (B) value for the quantitative analysis of Hx, with the linear range of 10–200 μM, which provided a convenient method for the real-time detection of Hx. This work not only provides a significant route to fabricate nanocomposite with outstanding tetraenzyme mimic activities but also offers a low-cost and rapid method for monitoring the freshness of aquatic products.
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JOURNAL OF NANOBIOTECHNOLOGY
·
2026
·
IF 15
Xie Wenjie,Xu Qianfeng,Yao YueXian,Chen Muqi,Zou Fen,Lin Jundong,Zhong Guowei,Zhou Haoran,Xu Jiaquan,Luo Pu,Liang Zhenguo,Du Qiuling,Li Jibiao,Zhang Jinxiang,Lu Puyang,Zhang Yixun,He Huichan,Zhuo Yangjia,Zhong Weide
Prostate cancer (PCa) is the most prevalent malignant tumor in the male genitourinary system. Carbon monoxide (CO) gas therapy and chemodynamic therapy (CDT) have emerged as alternative treatments for cancer. However, the therapeutic efficacy of both approaches is constrained by the insufficient endogenous hydrogen peroxide (H 2 O 2 ) supply and the overexpression of protective glutathione (GSH) in the tumor microenvironment (TME). Herein, we developed a biomimetic cascaded nanoreactor (DCM@MCuH@MnCO) for synergistically combining CO-mediated gas therapy with CDT driven by depletion of GSH and self-supply of H 2 O 2 in the tumor. DCM@MCuH@MnCO was constructed by integrating a copper-catechol coordinated network (CuH) and H 2 O 2 -sensitive manganese carbonyl (MnCO) within the mesoporous carbon hollow spheres (MCHS), and further modifying the surface with tumor cell membranes (DCM) to enhance its tumor-targeting ability. The CuH in the nanoreactor can disassemble, triggered by continuous consumption of GSH, releasing pro-oxidative catechol ligands to generate H 2 O 2 for TME remodeling. Subsequently, MnCO decomposes on demand to release CO in situ while copper ions (Cu + ) convert H 2 O 2 into reactive oxygen species (ROS) via a Fenton-like reaction. These events cooperatively cause mitochondrial damage and induce a lethal ROS storm within cells, ultimately effectively killing tumor cells both in vitro and in vivo. This study demonstrates significant prospects for CO therapy and CDT, offering a novel and promising strategy for efficient PCa treatment. Graphical
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CATALYSIS LETTERS
·
2026
·Vol. 156
·期 10
·282
·
IF 2.5
Ye Qihang,Zhong Zhaoping,Yang Yuxuan,Wang Wei,Jia You,Xiong Qi,Chen Huanqi,Zheng Xiang
Furfural, a key biomass-derived platform chemical, requires efficient hydrogenation for economic and research benefits. Herein, we propose a carbon-encapsulated catalyst with optimized active sites (using carbon-containing organics) for its highly selective hydrogenation. Experimental results demonstrated that carbon loading facilitated the conversion of strong acid sites to medium‑strong acid sites on the catalyst support, and also increased the Lewis/Brønsted (L/B) ratio. Through optimization of reaction conditions and carbon loading, complete conversion of furfural and a furfuryl alcohol selectivity as high as 99.17% were achieved at 160 °C for 4 h. The prepared catalyst maintained high furfuryl alcohol selectivity even after five cycles, owing to the protective carbon layer on the active support and the well-dispersed Cu species on its surface. DFT calculations further revealed that furfural preferentially adsorbs on the catalyst surface via the η¹(O)-aldehyde configuration, confirming the promotional role of the catalyst in furfural hydrogenation. Graphical
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