CHEMOSPHERE
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2023
·
IF 8.8
Ge Zhang,Weihong Wu,Meng Yao,Yumeng Cui,Yunhong Jiao,Hongqiang Qu,Jianzhong Xu
The traditional method of preparing graphene will cause serious environmental pollution, and the combustion of polymer materials will seriously harm people's health. In this paper, a Cu-MOF-coated graphene composite flame retardant (G@Cu-MOF) rich in flame retardant elements such as B and N was synthesized through green mechanical ball milling method. Flame retardants reduce the threat to the environment and people's lives and property. After adding 6 wt% G@Cu-MOF, the peak heat release rate, total heat release rate, CO production and CO 2 production of epoxy resin (EP) composite samples decreased by 55, 14, 59, and 55%, respectively. This type of Cu-MOF releases incombustible gases such as boron trifluoride (BF 3 ) and ammonia (NH 3 ) during combustion, diluting the concentration of combustible gases and producing copper borate in the condensed phase. Cu 2+ is reduced to Cu, and boron compounds are converted into boron oxides. The thermal conductivity of graphene can reduce the temperature of the matrix, and has good flame retardancy. It synergistically acts with Cu-MOF to promote the formation of high-quality residual char, and can significantly inhibit the heat and smoke release of EP. It plays a role in flame retardancy and protecting the substrate from fire. This study provides a new approach for preparing graphene hybrid flame retardants through mechanical ball milling, in order to improve the flame retardancy of EP and suppress the release of smoke and toxic gases.
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Journal of Water Process Engineering
·
2023
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IF 7
Xiuping Chen,Ting Zhang,Guangfei Qu,Yuanchuan Ren,Zuoliang Wang,Jun Wang,Ping Lu,Minhua Cheng,Xiaomei Chu
The degradation of cyanide ions in cyanide containing wastewater is a major challenge in water treatment . This article uses a one-step hydrothermal method to prepare iron copper bimetallic oxide catalysts and applies them for the rapid degradation of cyanide (CN − ). The experimental results show that under the optimal conditions, the removal rate of CN − in the bimetallic catalyst/H 2 O 2 system is close to 100 % within 1 h, which is significantly better than the single metal oxide catalyst. Through characterization by SEM-EDS, XRD, XPS, and combined with catalytic performance experimental analysis, it was found that. There is a synergistic effect between Cu and Fe, which can effectively promote the cycling of metal ions and improve the generation efficiency of hydroxyl radicals (HO • ) to a certain extent, thereby improving the degradation performance of CN − . In addition, ion chromatography was used to analyze the oxidation products and a possible pathway for CN − degradation was proposed. This provides new insights and ideas for the development of high-performance bimetallic oxide catalysts for cyanide degradation.
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FUEL
·
2023
·
IF 7.4
Yuheng Qiao,Zhenzhen Guan,Mengyan Zhang,Gan Chen,Shifeng Zhou,Hailong Liu,Jiang Wu,Ruitang Guo,Weiguo Pan,Fangqin Li,Ping He
In this paper, a series of Fe-based catalysts with Zeolite Socony Mobil-5 (ZSM-5) as supports were synthesized using the sol–gel method to obtain the Fe/ZSM-5, Mn-Fe/ZSM-5, Cu-Fe/ZSM-5 and Cu-Mn-Fe/ZSM-5 catalysts. The synthesized catalysts were examined and characterized via catalytic activity testing, X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), N 2 adsorption/desorption, scanning electron microscope (SEM), temperature-programmed desorption of NH 3 (NH 3 -TPD), temperature-programmed reduction with H 2 (H 2 -TPR) and diffuse reflectance infrared Fourier transform spectroscopy (DRIFTS). The results showed that the Cu-Mn-Fe/ZSM-5 catalyst had the best catalytic performance compared with the other catalysts. In addition, Fe/ZSM-5 and Cu-Mn-Fe/ZSM-5 all exhibited excellent stability as well as good tolerance to SO 2 & H 2 O under the experimental conditions. Further characterization results showed that with co-doping of Cu and Mn, the amount of Mn 4+ , Cu + , Fe 3+ and surface chemisorbed oxygen (O β ) on the surface of Fe/ZSM-5 increased, promoting the catalytic performance. The DRIFT studies revealed that the NH 3 -SCR reaction followed both the E-R and L-H mechanism on the surface of the Fe-based ZSM-5 catalyst. The Fe-based ZSM-5 catalyst is a good candidate for NH 3 -SCR both in high reactivity and outstanding stability.
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CHEMICAL ENGINEERING JOURNAL
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2023
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IF 15.1
Lulu Peng,Yanhong Quan,Jinxian Zhao,Jun Ren
Cu catalysts supported on nitrogen-doped carbon with ultra-high specific surface area (2726 m 2 ⋅g −1 ) derived from peanut shells (PSAC-N x ) were fabricated and investigated in the oxidative carbonylation of ethanol to diethyl carbonate (DEC). The Cu/PSAC-N x catalysts exhibited superior catalytic performance with a maximum STY DEC of 3371 mg·g −1 ·h −1 , attributed to the higher surface Cu 0 and Cu + concentration. Both Cu 0 and Cu + acted as the active species that accelerated the activation of ethanol molecules and promoted the insertion of CO, respectively, in the DEC synthesis. Among the four by-products, diethoxyethane preferred to be generated at higher temperatures or extended reaction time, while acetaldehyde and ethyl acetate tended to be produced at the Cu 2+ species and ethyl formate was inclined to be created at a higher oxygen fraction. This work provided theoretical and experimental guidance for the rational design of efficient catalysts and the optimization of reaction conditions for the ethanol oxidative carbonylation to DEC.
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Nanomaterials
·
2023
·Vol. 13
·期 20
·2745
·
IF 5.3
Jing Li,Mingjie Fan,Ziting Yuan,Fang Liu,Miao Li
Hexavalent chromium (Cr(VI)) is a typical heavy metal pollutant, making its removal from wastewater imperative. Although nanosized zero-valent iron (nZVI) and graphene-based materials are excellent remediation materials, they have drawbacks, such as agglomeration and being difficult to recycle. A facile synthesis method for decorating reduced graphene oxide (rGO) with ultrathin nZVI (within 10 nm) was explored in this study in order to develop an effective tool for Cr(VI) detoxication. Cu particles were doped in these composites for electron-transfer enhancement and were verified to improve the rate by 2.4~3.4 times. Batch experiments were conducted at different pHs, initial concentrations, ionic strengths, and humic acid (HA) concentrations. From these observations, it was found that the acid condition and appearance of Cu and rGO enhanced the treatment capacity. This procedure was fitted with a pseudo-second-order model, and the existence of NaCl and HA impeded it to some extent. Cr(VI) could be detoxified into Cr(III) and precipitated on the surface. Combining these analyses, a kinetics study, and the characterizations before and after the reaction, the removal mechanism of Cr(VI) was further discussed as a complex process involving adsorption, reduction, and precipitation. The maximum removal capacity of 156.25 mg g−1occurred in the acid condition, providing a potential Cr(VI) remediation method.Keywords:nano zero-valent iron (nZVI);reduced graphene oxide (rGO);Cu doping;hexavalent chromium (Cr(VI));removal
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PHYSICAL CHEMISTRY CHEMICAL PHYSICS
·
2023
·Vol. 25
·期 37
·25581-25593
·
IF 3.3
Yilin Zhang,Sen Li,Xianliang Qiao,Qingxin Guan,Wei Li
Cu-based catalysts are a promising alternative to toxic mercury catalysts for acetylene hydrochlorination, but their effectiveness is limited due to the poor dispersion and deactivation caused by reduction, agglomeration, and carbon deposition. In this study, the activity and stability of carbon-supported CuCl2 catalysts were largely improved by introducing N-heterocyclic ketones. Remarkably, N-methyl-2-pyridone (NM2P) coordinated Cu-based catalysts exhibited over 95% acetylene conversion with better stability under the reaction conditions of T = 180 °C, GHSV (C2H2) of 80 h−1, and VHCl/VC2H2 = 1.2. The combined results of characterization and exhaustive density functional theory (DFT) calculations revealed that the O–Cu coordination between the NM2P ligand and Cu cation strengthened the combination of reactants and Cu active sites, lowering the key reaction energy barrier, thereby leading to high activity. Meanwhile, the addition of the NM2P ligand significantly inhibited the reduction of Cu2+ to Cu+/Cu0, avoiding the formation of CuCl aggregates and the coking caused by Cu0, enhancing the catalytic stability. Overall, our study provides important insights into the design and optimization of Cu-based catalysts for acetylene hydrochlorination.
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SOLVENT EXTRACTION AND ION EXCHANGE
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2023
·
IF 2
Dong Cao,Shuai Wang,Xin Ma,Jia Yang,Hong Zhong
Herein, a novel C=O–NOH-contained compound was synthesized and used in the extraction and recovery of copper from sulfate solution. Dodecyl phenyl ethyl hydroxamic acid (DPEHA) exhibited high selectivity to Cu(II) over the competing ions, and the separation factors (β) obtained were βCu/Zn = 227.370, βCu/Co = 199.094, βCu/Ni = 188.889, respectively. The separation effect was stronger than that of 2-hydroxy-5-nonyl acetophenone oxime. Meanwhile, extraction capacity of 0.10 g Cu(II) per gram DPEHA was reached, and the extracted Cu(II) can be stripped effectively. The investigation of extraction mechanism revealed that O atoms in C=O and O-H groups of DPEHA operate as active sites, which could powerfully chelate with Cu(II) by forming stable five-membered rings. The high copper extraction efficiency and selectivity associated with a simple synthesis of DPEHA make it to serve as the potential selective Cu(II) extractant, which also provide a novel insight for the research and development of economical Cu(II) extractants.
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JOURNAL OF ALLOYS AND COMPOUNDS
·
2023
·
IF 6.2
Min Xie,Qiaozhen Xu,Tao Lv,Hong Liu
The search for effective and highly selective photocatalysts for CO 2 transformation is exceptionally desirable yet challenging. Herein, a novel BiVO 4 @PCN-224(Cu) heterostructure was constructed by growing BiVO 4 nanosheets on the surface of PCN-224(Cu) rods for visible-light-driven CO 2 photoreduction. The obtained BiVO 4 @PCN-224(Cu) heterostructure could selectively reduce CO 2 into CO in the absence of sacrificial reagents. The CO yield over the optimized sample reached 70.5 μmol g −1 h −1 (corresponding to an apparent quantum yield of 0.42% at 450 nm), a 5.1-fold increase over pristine PCN-224(Cu). The boosted activity of the hybrid could be credited to the S-scheme heterojunction formed at the interface of PCN-224(Cu) and BiVO 4 , which facilitated the separation of photogenerated charges and ameliorated the redox capability. In-situ XPS and hydroxyl radical determination confirmed the S-scheme charge transfer mode. This study provides a new strategy for constructing S-scheme heterojunctions involving metalloporphyrin-based metal-organic frameworks for high-performance CO 2 conversion.
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Bioactive Materials
·
2021
·
IF 14.593
Libin Pang,Renliang Zhao,Jing Chen,Jingxin Ding,Xiaochen Chen,Wenwen Chai,Xu Cui,Xiaolin Li,Deping Wang,Haobo Pan
Critical bone defects caused by extensive excision of malignant bone tumor and the probability of tumor recurrence due to residual tumor cells make malignant bone tumor treatment a major clinical challenge. The present therapeutic strategy concentrates on implanting bone substitutes for defect filling but suffers from failures in both enhancing bone regeneration and inhibiting the growth of tumor cells. Herein, Cu and Mn-doped borosilicate nanoparticles (BSNs) were developed for syncretic bone repairing and anti-tumor treatment, which can enhance bone regeneration through the osteogenic effects of Cu 2+ and Mn 3+ ions and meanwhile induce tumor cells apoptosis through the hydroxyl radicals produced by the Fenton-like reactions of Cu 2+ and Mn 3+ ions. In vitro study showed that both osteogenic differentiation of BMSCs and angiogenesis of endothelial cells were promoted by BSNs, and consistently the critical bone defects of rats were efficiently repaired by BSNs through in vivo evaluation. Meanwhile, BSNs could generate hydroxyl radicals through Fenton-like reactions in the simulated tumor microenvironment, promote the generation of intracellular reactive oxygen species, and eventually induce tumor cell apoptosis. Besides, subcutaneous tumors of mice were effectively inhibited by BSNs without causing toxic side effects to normal tissues and organs. Altogether, Cu and Mn-doped BSNs developed in this work performed dual functions of enhancing osteogenesis and angiogenesis for bone regeneration, and inhibiting tumor growth for chemodynamic therapy, thus holding a great potential for syncretic bone repairing and anti-tumor therapy.
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CHINESE JOURNAL OF CHEMICAL ENGINEERING
·
2021
·
IF 3.171
Xin Yong,Hong Chen,Huawang Zhao,Miao Wei,Yingnan Zhao,Yongdan Li
The effects of SO 2 on an one-pot synthesized Cu-SSZ-13 catalyst for selective reduction of NO x by NH 3 were examined. The addition of SO 2 inhibited NO x conversion significantly below 300 °C, while no effect on NO x conversion was observed above 300 °C. TGA, TPD , and XPS results showed that the deactivation was caused by the formation of (NH 4 ) 2 SO 4 , SO 2 chemisorption on the isolated Cu 2+ ion sites, as well as the formation of CuSO 4 -like species. Among them, the site-blocking effect of (NH 4 ) 2 SO 4 on Cu 2+ was the primary reason for deactivation. Fortunately, 89% of deNO x activity of the poisoned catalyst was recovered after thermal treatment at 500 °C in air, where (NH 4 ) 2 SO 4 was completely decomposed. The activity was further recovered with regeneration temperature increasing to 600 °C, removing the adsorbed SO 2 on the Cu 2+ sites. The regeneration at 600 °C could not recover the activity completely, because of the high stability of CuSO 4 -like species.
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Scientific Reports
·
2021
·Vol. 11
·期 1
·1-13
·
IF 4.38
Tang Xi,Zhang Yifei,Li Weiqi,Geng Jinju,Ren Hongqiang,Xu Ke
Humic acid (HA) is the main component of organic matter in effluent from wastewater treatment. The effective removal of HA is significant. In this study, a novel catalyst was prepared using a transition metal oxide as the active component and Al 2 O 3 as a granular carrier. The mechanism of catalytic ozonation of HA under neutral pH conditions and its efficiency were investigated. Under the chosen conditions (an ozone concentration of 2.2 mg/L, 50 mg/L HA solution, catalyst dosage of 5 g/L and initial pH of 6.49), the Cu/Ce–Al 2 O 3 bimetallic catalyst led to 54.79% TOC removal rate after 30 min; the removal rate by ozone alone was only 20.49%. The characteristics of organic compounds determined by FT-IR and GC–MS showed that organic compounds were degraded significantly by the catalytic treatment. The addition of catalysts could effectively degrade toxic intermediates and reduce the acute toxicity produced by ozonation. Humic acid substances were largely removed and transformed into biodegradable intermediates. This study proposes a new and efficient ozonation catalyst for practical applications in advanced wastewater treatment.
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MICROCHEMICAL JOURNAL
·
2020
·
IF 3.594
Hui Ma,Ronghua Zhang,Qi Kang,Tao Wang,Jianhong Xiao,Xuezhi Li,Li Yu
A facile, low-cost and label-free liquid crystals (LCs) sensing platform laden with Cu(ClO 4 ) 2 was herein established for detection and distinction of sulfhydryl amino acids, namely cysteine (Cys) and homocysteine (Hcy). When introducing Cys or Hcy to the fluid interface with Cu(ClO 4 ) 2 , the optical appearance of LCs exhibited a bright-to-dark transition, which coupled to the interactions between Cu 2+ and the sulphydryl of amino acids. Concomitantly with, the orientation of LCs varied from tilted to homeotropic state. Besides, this sensor system did not respond to other nineteen amino acids that make up human proteins. The detection limit of Cys and Hcy is around 0.01 mg/mL (~82.5 μM) and 0.05 mg/mL (~370.0 μM), respectively. Compared with Cys, the as-prepared LCs sensing platform shows a higher detection limit and longer response time for Hcy, based on which these two sulfhydryl amino acids can be distinguished from each other. This can be attributed to the additional methylene for Hcy, resulting in formation of a five-membered ring Hcy thiolactone which may not chelate with Cu 2+ . The LCs-based analytical platform constructed in this work can provide a convenient and label-free method for detecting and differentiating sulfhydryl amino acids.
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