BIORESOURCE TECHNOLOGY
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2018
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IF 5.807
Meng Li,Shaoqi Zhou
Cu(II) ion was employed as an electron-shuttle mediator to enhance bioelectricity output and accelerate reduction rate of Cr(VI) in a dual-chamber microbial fuel cell (MFC). In the presence of Cu(II), power density and the Cr(VI) reduction rate were 1235.53 mW m −2 and 1.191 g m −3 h −1 , respectively, which were 1.44 times and 1.17 times than that of MFC in the absence of Cu(II). A series of electrochemical analysis confirmed the presence of Cu(II) can diminish overpotential and diffusional resistance of MFC, further accelerating electrochemical reduction process of Cr(VI) via an indirect mechanism. After reduction, Cr(VI) and Cu(II) in this work were mainly deposited on cathode electrodes in the form of Cr(OH) 3 and little Cu, thus wastewater containing Cr(VI) was successfully treated by bio-electrochemical technology. The aim of this work was to study the efficacy of Cu(II) as an electron-shuttle mediator for improved bioelectricity generation and Cr(VI) reduction in MFCs.
研究领域:
环境工程
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生物电化学
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废水处理
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能源回收
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CHEMICAL ENGINEERING JOURNAL
·
2023
·
IF 15.1
Jie Tao,Feihao Yang,Tao Wu,Junjiao Shi,Hai-Bo Zhao,Wenhui Rao
The frequent occurrence of fires caused by rigid polyurethane foam highlights the importance of its fire safety, however, the existing flame-retardant methods often seriously deteriorate the mechanical properties and thermal insulation of the foam. Here, we demonstrate a new idea for thermal insulation, flame retardancy, smoke suppression, and reinforcement of polyurethane foams only by incorporating a P/Cu-hybrid silica aerogel. This unique aerogel combines with the carbon-promoting action of P, catalytic attenuation of Cu, and the barrier effect of aerogels, thus leading to high smoke-suppressing and flame-retardant efficiency for polyurethane foam. At a low addition amount of 5 wt% aerogel, the total heat release, peak heat release rate, total smoke release, and toxic CO production of the composite foam are all significantly reduced. Interestingly, the aerogel-containing composite foam exhibits a special hierarchical porous structure, which enables lower thermal conductivity and higher thermal insulation than pure RPUF. Benefitting from the good compatibility and nano-enhancing effect of the aerogel, the compressive strength of the composite foam remarkable increase of 52.2%. This research offers an effective method for designing high-performance foam materials with high fire safety and low thermal conductivity, which has broad application prospects in the field of thermal insulation.
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FUEL
·
2023
·
IF 7.4
Chao Wang,Ying Liu,Kang Niu,Jia Li,Qing Cao,Xiuchen Zhao,Hongyang Li,Ningfei Wang,Baolu Shi
To improve the combustion efficiency of widely used micro-aluminum (μAl) particle, enhancing its ignition and combustion performances is a critical issue via breaking through the intrinsic Al 2 O 3 layer covering the Al-core. This study proposed a facile in-situ ‘one-pot’ electroless plating method to functionalize the surface of μAl particles with ternary-shelled nickel-phosphorus-copper alloy coating and furthermore investigated the thermochemical and ignition/combustion behaviors of energetic core–shell composites (defined as Al@Ni-P-Cu). The microstructure characterization results of Al@Ni-P-Cu demonstrated that a spherically distributed triple-shell Ni-P-Cu alloy with the thickness of 129 nm was tightly coated on μAl particle surface. Through TG-DSC analysis, the Al@Ni-P-Cu composites exhibited improved heat release (7597.7 J/g) and decreased initial oxidation temperature (814.3 °C) in comparison to that of μAl particle with 949.2 J/g and 960.1 °C, respectively. The Al@Ni-P-Cu exhibited extremely shorter laser ignition delay time of 36.3 ms under 1 MPa O 2 atmosphere, reducing by 86.86% compared with that of raw μAl particles (276.3 ms); and its maximum flame temperature could reach up to 1588.93 °C, increasing by 243.36 °C compared with that of μAl (1345.57 °C). The drastic improving performances were attributed to the synergistic effects of surface/interfaces reactions along with heat release in the core–shell structure, resulting in enhanced mass and heat transfer to facilitate the combustion of internal Al-core.
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TALANTA
·
2023
·
IF 6.1
Xiaoyi Xie,Xiaofang Chen,Yaohui Wang,Maosen Zhang,Yuxiu Fan,Xiupei Yang
The design of nanozymes with high metal atom loading is of great significance to improve enzyme activity and is also the key to furthering the construction of highly sensitive colorimetric sensors. In this work, a colorimetric sensor for the quantitative analysis of tannic acid (TA) was developed based on two-dimensional carbon nanosheet carbon nitride (CN)-supported Cu single-atom nanozymes (Cu/CN). Cu/CN was synthesized by supramolecular preorganization and calcination , with an ultrathin nanosheet structure and a high density of Cu active sites, with a Cu loading of up to 14.3 wt%. Benefiting from the above characteristics, Cu/CN exhibits peroxidase-mimicking activity and excellent catalytic performance. Therefore, a colorimetric sensor was constructed for the fast and sensitive quantitative analysis of TA with good linearity in the range of 0.09–3.2 μM and a low detection limit of 30 nM. Furthermore, the sensor was successfully applied to the analysis of TA in tea samples of different varieties. This work sheds new light on the design of nanozymes with a high density of active sites and the analysis of TA in real environments.
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JOURNAL OF SOLID STATE CHEMISTRY
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2023
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IF 3.3
Yawen Guan,Shanshan Fu,Wanyu Song,Xueyan Zhang,Bangyu Liu,Fang Zhang,Fang Chai
4-nitrophenol (4-NP) is a harmful aromatic compound to environment. The catalytic hydrogenation of 4-NP was considered as a profitable approach due to the valuable organic intermediate product. High efficiency catalysts are crucial. Herein, Cu–Au bimetallic nanospheres (BNSs) with sea urchin structure were fabricated by tuning the reaction condition and ratio of precursors. The Cu–Au BNSs exhibited effective catalytic activity in the reduction of 4-NP and K 3 [Fe(CN) 6 ]. The optimum catalyst can be determined as the Cu–Au BNSs prepared by 15 mL AA, 4-NP can be reduced to 4-AP in 150 s (k = 3.02 × 10 −2 s −1 ) with TOF value of 0.149 (s −1 ). The reusability of Cu–Au BNSs was evaluated with high effectiveness, the catalytic activity remained negligible loss over 18 cycles with efficiency over 95%, indicated their good reusability, which can be attributed to the synergistic effect of Cu–Au BNSs. The fabrication of bimetallic nanostructures provided an efficient approach to design efficient catalyst.
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ACS Omega
·
2023
·
IF 4.1
Jie Liang,Weiwei Zhang,Jun Wang,Wanzhen Li,Fei Ge,Weihao Jin,Yugui Tao
Recently, the combination of chemotherapy and chemodynamic therapy (CDT) has become a desirable strategy in the treatment of cancer. However, a satisfactory therapeutic outcome is often difficult to achieve due to the deficiency of endogenous H2O2 and O2 in the tumor microenvironment. In this study, a CaO2@DOX@Cu/ZIF-8 nanocomposite was prepared as a novel nanocatalytic platform to enable the combination of chemotherapy and CDT in cancer cells. The anticancer drug doxorubicin hydrochloride (DOX) was loaded onto calcium peroxide (CaO2) nanoparticles (NPs) to form CaO2@DOX, which was then encapsulated in a copper zeolitic imidazole ester MOF (Cu/ZIF-8) to form CaO2@DOX@Cu/ZIF-8 NPs. In the mildly acidic tumor microenvironment, CaO2@DOX@Cu/ZIF-8 NPs rapidly disintegrated, releasing CaO2, which reacted with water to generate H2O2 and O2 in the tumor microenvironment. The ability of CaO2@DOX@Cu/ZIF-8 NPs to combine chemotherapy and CDT was assessed by conducting cytotoxicity, living dead staining, cellular uptakes, H&E staining, and TUNEL assays in vitro and in vivo. The combination of chemotherapy and CDT of CaO2@DOX@Cu/ZIF-8 NPs had a more favorable tumor suppression effect than the nanomaterial precursors, which were not capable of the combined chemotherapy/CDT.
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APPLIED SURFACE SCIENCE
·
2023
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IF 6.7
Yuqi Zhang,Jiasi Yan,Rixin You,Meng He,Ligen Wang,Minghui Liang
The catalytic epichlorohydrin (ECH) hydrogenation to chloro-propanol is of great industrial importance due to the extensive application of chloro-propanol as an intermediate for pharmaceutics, fine chemicals, and polymers. The challenge of this catalytic reaction lies in that dechlorination can hardly be inhibited in the selective hydrogenation of the epoxy group because the bond energy of the C-Cl bond is very close to that of the C O bond. Herein, we demonstrated that the selectivity of chloro-propanol could be improved from 82.2 % to 94.6 % by incorporating a small amount of Cu single atoms into Pt/C catalysts to inhibit dechlorination. More interestingly, the ring-opening site of the epoxy group can be also engineered by the incorporation of Cu single atoms, as evidenced by the significant increase in the selectivity of 3-chloro-1-propanol from 0.2 % to 14.5 %. Comprehensive characterizations and density functional theory (DFT) calculations were carried out to understand the interplay of Cu single atoms and Pt nanoparticles as well as its effect on the catalytic performance. The insights gained in this study will benefit the development of catalysts, especially the bimetallic catalysts for the selective hydrogenation of halogeno-aliphatic compounds.
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MICROCHIMICA ACTA
·
2023
·Vol. 190
·期 5
·1-10
·
IF 5.7
Wei Chunying,Lin Huiqing,Bai Hehe
Five G-/C-rich single-stranded DNA (ssDNA) with different sequences and lengths were templated to prepare the DNA-Cu, DNA-Fe, and bimetallic DNA-Cu/M nanoclusters (NCs). The peroxidase-like activities of these nanomaterials were studied using H 2 O 2 and 3,3′,5,5′'-tetramethylbenzidine (TMB) as the reaction substrates in HAc-NaAc buffer. It was found that T30-G2-Fe NCs and T30-G2-Cu/Fe NCs, with a size of about 2 nm, exhibit similar and the strongest enzyme-like activity under optimal conditions. Both NCs possess a similarly high affinity to substrates, and the Michaelis–Menten constant ( K m ) values to TMB and H 2 O 2 are about 11 and 2–3 times lower than those of natural horseradish peroxidase (HRP), respectively. The activity of both nanozymes decreases to about 70% after being kept for one week in pH 4.0 buffer at 4 °C, which is comparable with HRP. Hydroxyl radicals (•OH) are the main reactive oxygen species (ROS) produced in the catalytic reaction. Moreover, both NCs can facilitate in situ generation of ROS in HeLa cells using endogenous H 2 O 2 . MTT assays indicate that the T30-G2-Cu/Fe NCs exhibit the strong selective cytotoxicity to HeLa cells over HL-7702 cells. The cellular viability is about 70% and 50% after incubating with 0.6 M NCs for 24 h without or with 2 mM H 2 O 2 , respectively. The current study shows that the T30-G2-Cu/Fe NCs have the potential for chemical dynamic treatment (CDT). Graphical abstract
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INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2023
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IF 8.2
Lei Zhang,Qimei Li,Jiaqi Zhu,Heng Liu,Xueling Liu,Yi Wang,Guozhi Fan,Yanjun Huang,Likun Li
In this study, a novel composite bead (MPB-ALG) was prepared by encapsulating H 2 O 2 modified peanut shell-derived biochar (MPB) into alginate matrix through a facile method. The structure and properties of prepared materials were characterized using FTIR , BET, SEM, and XPS . Batch adsorption experiments were performed to compare the Cu(II) adsorption performance of MPB, plain alginate beads (ALG), and MPB-ALG. The effect parameters of the components, solution pH, contact time, initial concentration, and coexisting ions were studied systematically. The results showed that the maximum adsorption capacity of the optimized MPB-ALG-1 (MPB/alginate = 1:1 w/w%) was 117.4 mg g −1 at pH 5, which was much higher than that of MPB (37.4 mg g −1 ). The adsorption kinetics and isotherms data of Cu(II) on MPB-ALG-1 were well described by Elovich kinetic model and Freundlich adsorption isotherm. Compared with plain ALG beads, MPB-ALG-1 exhibited better reusability and anti-interference of coexisting ions. Finally, the adsorption mechanisms of Cu(II) on MPB-ALG-1 beads were revealed by FTIR and XPS analysis. The experimental results demonstrated that MPB-ALG-1 beads can be used as an environmentally friendly and efficient adsorbent for the removal of Cu(II) from wastewater.
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INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2023
·
IF 7.2
Mingyuan Zhang,Shuozhen Hu,Xinsheng Zhang
Heteroatom-doped transition metal electrocatalysts supported on carbon materials are widely-recognized as the promising catalysts for oxygen reduction reaction (ORR). Here, we describe the one-pot method of preparing the Cu-based PAT 1 -Cu x /KB catalyst with Cu/N/S doped graphene-like nanosheets . For the obtained catalyst, Cu 2+ ions catalyzed the polymerized 2-aminothiazole organic monomers into nanosheet and simultaneously in-situ doped Cu, N, S atoms into the carbon matrix. The amount of Cu 2+ ions affected the geometry structure, as well as the formation of Cu–N structure and C–S–C bond of PAT 1 -Cu x /KB catalyst. Cu 2 S crystals with ORR catalytic ability were also generated in the catalysts. The Cu–N structure in the catalyst regulates the d -electron density of inert copper through the synergistic effect of electronic connection between copper and nitrogen atoms . N and S doped in the carbon skeleton changes the spin density and charge distribution of near carbon atoms. Therefore, PAT 1 -Cu 0.33 /KB catalyst with graphene-like nanosheets, Cu–N structure, C–S–C bond, and Cu 2 S crystals exhibits excellent activities with E 1/2 = 0.84 V and high limit-current density of 5.25 mA cm −2 for ORR.
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ANALYTICA CHIMICA ACTA
·
2022
·
IF 6.911
Tingting Li,Guoqiang Guo,Haoming Xing,Yiru Wang,Xinyu Luo,Linfan Wang,Chenjie Gu,Yafei Hou,Da Chen
The appearance of multi-drug resistant Escherichia coli makes the combination of tetracyclines (TCs) and quercetin (QCT) more common to fight stubborn bacterial infections so that the effective detections of TCs and QCT are essential and necessary. Here, a novel fluorescence probe for differentiating TCs and QCT is developed based on the nitrogen and copper co-doped carbon dots (N, Cu-CDs). The N, Cu-CDs are prepared from ethylene diamine tetraacetic acid (EDTA) and anhydrous copper chloride as precursors through hydrothermal process and exhibit bright blue fluorescence with excellent optical stability. With the presence of four tetracyclines (DOX, TC, CTC and OTC), the fluorescence intensity of N, Cu-CDs is quenched directly due to the internal filtration effect (IFE), and the detection limit obtained through single-signal fluorescence sensing is as low as 23.8 nM for DOX , 37.2 nM for TC, 43.8 nM for OTC and 28.8 nM for CTC. More remarkably, three dimensional ratiometric fluorescence probe for detecting QCT is proposed based on the appearance of another emission at (410 nm, 490 nm) due to electron transform (ET) process. This new method shows a good linear relationship in the range of 10–100 μM with a low detection limit of 59.3 nM. Furthermore, a dual-channel fluorescence sensing platform based on microfluidics paper-based analytical devices (μPADs) is developed for simultaneously visual discrimination of TCs (DOX is chosen as the typical detecting model for TCs) and QCT. This investigation provides a new way for the development of CDs as multifunction fluorescence probes.
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WATER AIR AND SOIL POLLUTION
·
2023
·Vol. 234
·期 2
·1-16
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IF 2.9
Kang Yongfeng,Yu Yingyuan,Zhang Bingqian,Fu Jianning,Jiang Xixi,Jia Baiyun,Men Xiaoling,Li Li
Metal–organic frameworks (MOFs) are ideal adsorbents for wastewater treatment and excellent antibacterial agents. In this study, Cu-NH 2 -MOF chitosan composite microspheres were prepared by the in situ method, and the synthesized microspheres solved the disadvantages of poor recoverability of powder adsorbent and complex operation process. Cr(VI) was removed by adsorption, and the microspheres had a good bacteriostatic effect. The synthesized MOF chitosan composite microspheres were systematically characterized. The adsorption kinetics, isotherms, and thermodynamic properties were appraised, and influences of adsorption conditions toward Cr(VI) adsorption were studied. The kinetic study demonstrated that the adsorption of Cr(VI) by CS@Cu-MOF-M conformed to the pseudo-second-order model. The adsorption isotherms fit the Sips model, and the maximum adsorption capacity of CS@Cu-MOF-M for Cr(VI) was 159.25 mg/g under optimal conditions. The thermodynamic result showed that the removal of Cr(VI) was a spontaneous endothermic process. The adsorption rate of CS@Cu-MOF-M was still more than 80% of that of the first one after four cycles of regeneration experiments. The antibacterial activity results showed that MOF chitosan composite microspheres had good antibacterial properties with MIC value of 0.2 mg/mL and MBC value of 1 mg/mL. These results demonstrated that the synthesized CS@Cu-MOF-M had a great potential to treat wastewater containing Cr(VI) and bacterial contamination. Graphical Abstract
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