MRS Communications
·
2023
·Vol. 13
·期 2
·268-275
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IF 1.9
Qiao Xinfeng,Hu Chuanlin,Yao Shun,Wang Fazhou
This study is to explore the micro-mechanical properties of C–S–H modified by various carbon nanotubes and the correlation with the nano/micro-structures. The results show that carboxyl-functionalized single-walled carbon nanotubes provide the great template for the growth of C–S–H and reduce the porosity and surface defects of C–S–H particles. The highly ordered and dense layered structure of C–S–H greatly improves its micro-mechanical properties. In addition, the functional groups (–COOH) of functionalized carbon nanotubes can combine with the Ca–O bond of C–S–H to change the interlayer spacing of C–S–H, and the effects are particularly significant at low Ca/Si. Graphical abstract
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CERAMICS INTERNATIONAL
·
2022
·
IF 5.532
Mengxiao Zhao,Tian Fang,Liping Ni,Yaping Zhu,Ruili Zhang,Ping Chen,Anjian Xie,Yuhua Shen
Copper phosphide has shown remarkable development potential in the anode materials of lithium ion batteries (LIBs) due to its high mass/volume ratio capacity. Nevertheless, the low conductivity and volumetric expansion in the cycling process restrict its practical application. Herein, we ingeniously designed and successfully prepared copper phosphide (Cu 3 P)@carbon (C) nanocomposite with multi-stage pore inverse opals (Cu 3 [email protected] MSPIOs), including possessed the ordered macropores with the mean aperture of ∼100 nm induced by polystyrene (PS) sphere templates and the mesoporous structure with the pore size range of 3.0-9.5 nm and 16–27 nm derived from metal-organic framework (MOF) precursor. Compared to the Cu 3 [email protected] particles prepared without PS sphere templates, the Cu 3 [email protected] MSPIOs as the anode materials demonstrated exceptional lithium storage performance. At a high current density of 2 A g -1 , the discharge specific capacity of Cu 3 [email protected] MSPIOs was 295 mA h g -1 in the 1st cycle while that dropped to 204 mA h g -1 during the 2nd one, and then gradually stabilized. After 1500 cycles, the discharge specific capacity can still reach to 166.3 mA h g -1 , maintaining 81% capacity compared to the 2nd discharge specific capacity, which indicates the Cu 3 [email protected] MSPIOs as the anode material presented good cycling stability. Apparently, the multi-stage pore structure, which can effectively resolve the volumetric change problem during lithium ion (Li + ) intercalation/deintercalation as well as facilitate contact between electrolyte and anode, is primarily responsible of the superior Li-ion storage property of Cu 3 [email protected] MSPIOs. At the same time, MOF derived carbon can improve electrical conductivity, accelerate the formation of a stable solid electrolyte interface membrane and also provide buffer layers to further alleviate volumetric expansion.
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RSC Advances
·
2022
·Vol. 12
·期 51
·32898-32902
·
IF 4.036
Fanwei Meng,Guofang Ma,Jiahe Qiu,Zhendong Fu,Jiaqing Yan,Lingping Wang
Nanozyme is a material with enzyme-like catalytic activity, which has been widely used in environmental, antibacterial, and other fields of research. However, there are few reports on the toxicity of nanozymes. In this work, nanozymes co-assembled from sodium N-lauroyl sarcosinate (Ls) and Cu ions possess a Cu(I)–Cu(II) electron transfer system similar to that of natural laccases. Reaction kinetic studies show that the catalyst follows a typical Michaelis–Menten model. Cu–N-lauroyl sarcosinate nanozyme (Cu-Ls NZ) possess excellent laccase-like activity to oxidize a variety of phenol-containing substrates, such as phenol, 4-iodophenol, and 2,4,5-trichlorophenol. To evaluate the toxicity of the material, the nematode C. elegans was exposed to various concentrations of Cu-Ls NZ. Effects on physiological levels were determined. The results showed that high doses of Cu-Ls NZ increased the amount of reactive oxygen species (ROS), decreased the locomotor activity of nematodes, and inhibited their larval growth.
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PubMed
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APPLIED SURFACE SCIENCE
·
2022
·
IF 7.392
Huanhuan Li,Xiaoyan Yuan,Penghuan Zhao,Zhuoying Ping,Yi Liu,Shouwu Guo
A ingenious approach of synergistic strategy between MXene and one-dimensional (1D) materials have been proved for enhancing the performance of composites. However, the problem of MXene aggregation in compounding processes usually reduces their superiority. Herein, few-layered Ti 3 C 2 T x wrapped SiC/C nanofibers (SiC/C@MXene NFs) with a core-sheath microstructure were synthesized via a method of electrostatic self-assembly. Strong electrostatic adsorption bonding anchored the Ti 3 C 2 T x sheets on surface of the SiC/C NFs, which effectively inhibited the self-restacking and thus efficiently enhanced their electromagnetic (EM) wave absorption and photothermal conversion performances. As a result, 8.0 wt% SiC/C@MXene NFs dispersed in paraffin simultaneously exhibited a minimum reflection loss (RL, dB) and effective absorption bandwidth (EAB, RL < -10 dB) of −70.9 dB and 6.32 GHz at 2.63 mm. Besides, 0.4 wt% SiC/C@MXene NFs dispersed in waterborne polyurethane (PU) achieved strong photothermal conversion abilities, with the maximum temperatures rising to 95, 145, 183, and 201 °C at light intensities of 0.1, 0.2, 0.3, and 0.4 W cm −2 , respectively. Therefore, the synergistic strategy effectively utilizes the structural advantages of the 2D Ti 3 C 2 T x and 1D SiC/C NFs, endowing SiC/C@MXene NFs with core-sheath microstructure, and effectively improving their EM wave absorption and photothermal conversion performances.
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PROCESS SAFETY AND ENVIRONMENTAL PROTECTION
·
2022
·
IF 7.926
Hussein Abdelraouf,Jing Ding,Jiayi Ren,Guanshu Zhao,Fanyang Zhou,Shuyan Guan,Xuedong Zhai,Qingliang Zhao
A novel and short-term preparation method was conducted to fabricate pristine BiVO 4, and Gadolinium (Gd) doped BiVO 4 photocatalysts at sub-100 °C. The optical, structural, morphology, microstructure, and compositional characteristics of the fabricated photocatalysts were examined, which illustrated that the doping of Gd stabilized the existence of the tetragonal phase structure and enlarged the specific surface area of the pristine BiVO 4 . The comparison of the photocatalytic performance, preparation power consumption , and preparation cost showed the superiority of Gd doped BiVO 4 photocatalyst fabricated by the Short-Term Synthesis Method at sub-100 °C. The ofloxacin (OFL) removal rate with 5%, 7%, and 10% Gd-BiVO 4 photocatalysts was 1.53, 1.61, and 1.83 times that with pristine BiVO 4 under sunlight, respectively. The degradation performance of target contaminants, including diclofenac, tetracycline HCl , ofloxacin, rhodamine B, and sulfadiazine, was demonstrated after one hour of sunlight irradiation with 5% Gd-BiVO 4 , achieving the removal efficiencies of 98.63%, 98.07%, 97.98%, 92.09%, and 78.56%, respectively. The effect of various factors on the removal performance was revealed, indicating that SO 4 2− and H 2 PO 4 − had a remarkable inhibitory effect on the degradation. The 5% Gd-BiVO 4 also showed excellent reusability and stability after five-cycle runs. The photogenerated holes (h + ) and the superoxide radicals ( • O 2 − ) were the predominant generated active species , and the possible photocatalytic mechanism for the degradation of organic contaminants was proposed. Simple prepared Gd-BiVO 4 photocatalysts were revealed to be a practical and potential choice for efficiently degrading contaminants with sunlight as green energy.
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2023
·
IF 5.2
Ke Wu,Chunlei Wu,Wenou Bai,Ning Li,Yangqin Gao,Lei Ge
Hydrogen energy is vital important for solving pollution of environment and energy shortage. Hydrogen production via solar energy and semiconductor photo-splitting water is one of the most environmentally friendly strategies at present. In this work, Co-N-C, a non-noble metal-based ZIF-67 derivative, was employed as a co-catalyst to achieve an in situ growth of spherical CdS via simple one-step hydrothermal. Due to the large specific surface area of Co-N-C, the agglomeration of CdS is avoided and the photocorrosion phenomenon is weakened. Under irradiation of visible light , the hydrogen generation activity of Co-N-C/CdS was achieved 905 μmol g −1 h −1 . It is 6 times that of pure CdS with excellent stability. At the contact interface of the Co-N-C and CdS, the transfer and the separation of photoinduced carriers had been enhanced by a great many of channels. DFT calculation further showed that Co nanoclusters , as the active sites of hydrogen production, significantly enhanced photocatalytic hydrogen evolution activity. Therefore, Co-N-C not only acts as electron acceptor , but also serves as support of highly dispersed CdS to promote the stability of system during photocatalytic hydrogen generation. This work demonstrates the advantages of CdS binding MOF derivatives to construct composite photocatalysts with enhanced dispersibility and hydrogen production activity.
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CHEMICAL PAPERS
·
2022
·Vol. 76
·期 6
·3937-3947
·
IF 2.146
Li Xinxin,Lin Min,Zhang Hongfeng,Ji Wenquan,Shi Yuhan,Qi Zhiyang,Fu Tianwen,Li Qinran,Deng Qiliang
A kind of surface imprinted particles was synthesized to recognize cytochrome c (Cyt c) by a novel strategy combining reversible addition-fragmentation chain transfer (RAFT) radical polymerization and epitope surface imprinting. N-terminal epitope nonapeptide of Cyt c was chosen as the template. The selectivity of these particles for protein recognition was obviously improved due to the selection of epitopes rather than the whole protein as templates and the controllable length of polymer shell chain. After epitope had been modified on the surface of silica, the surface imprinted polymer with controlled imprinted layer was synthesized with monomers and cross-linkers by RAFT radical polymerization strategy. The epitope surface imprinted particles were obtained after the peptide removed and trithioester group destruction by hexylamine. The binding capacity of N-terminal peptide reached 1.88 mg peptide per gram with imprinting factor (IF) as 2.42 while the binding capacity of Cyt c reached 8.89 mg protein per gram with IF as 1.71, which were obviously higher than the IF of the material without RAFT strategy. Moreover, Cyt c could be selectively recognized by the epitope surface imprinted particles even in presence of the competitive proteins with different molecular weight and isoelectric point. The performance of protein recognition remained 90% after five cycles of adsorption and desorption. All these results demonstrated that the epitope surface imprinted particles prepared by RAFT strategy are promising to achieve the protein recognition with higher recognition ability, selectivity and reusability.
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ChemElectroChem
·
2022
·Vol. 9
·期 5
·e202101381
·
IF 4.782
Ru Meng,Feng Li,Dan Li,Baokang Jin
Graphical Benzo[c]cinnolines , an important framework material in the field of pharmaceutical chemistry, were synthesized efficiently and conveniently with CO 2 as deoxidizer by a green electrochemical method, sealing CO 2 . Benzo[c]cinnolines are an essential framework material in medicinal chemistry owing to its promising anti-cancer and antioxidant activity, and good pharmacological properties. Accordingly, benzo[c]cinnolines are synthesized through electrochemical reduction of 2,2’-dinitrobiphenyl (DNBP) in aprotic solvents with CO 2 . Cyclic voltammetry (CV), cyclic voltabsorptometry (CVA), derivative cyclic voltabsorptometry (DCVA) techniques, and in-situ FT-IR spectroelectrochemistry are used to investigate the mechanism of electrochemical reduction of DNBP in the presence of CO 2 . It is a reversible 2-electron-transfer reaction in an aprotic solution of DMSO in the absence of CO 2 , while it turned into a completely irreversible 8-electron process in the presence of CO 2 . Benzo[c]cinnolines were finally obtained by potentiostatic electrolysis with conversion rate of 99 %, indicating the high selectivity of this reaction. Above all, DNBP can be electrochemically reduced into BC in the presence of CO 2 , providing a theoretical and practical path for electrochemical synthesis of bioactive benzo[c]cinnolines (BC).
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SENSORS AND ACTUATORS B-CHEMICAL
·
2022
·
IF 9.221
Ruodong Huang,Jin Quan,Baochang Su,Chunzong Cai,Shuhua Cai,Yaowei Chen,Zongxia Mou,Ping Zhou,Dong Ma,Xin Cui
Monitoring C-reactive protein (CRP) levels in point-of-care testing (POCT) scenarios is of great value in early diagnosis, prevention and treatment of inflammation in patient’s home, development country as well as other resource-limited settings. Here, we reported a sensitive, economic and simple biosensing approach for visual and sensitive CRP detection by trapping and accumulating microparticles in a photolithography-free, low-cost microfluidic chip. A competition assay among microparticles, magnetic nanoparticles and CRP antigen is utilized to quantify the CRP concentrations. When CRP antigen is present, fewer magnetic nanoparticles can bind to antibody-conjugated microparticles, leaving the free microparticles flowing and trapping in a microfluidic particle accumulation chip after magnetic separation, and forming a length-quantifiable visual bar, which is proportional to the concentrations of CRP in detection samples. Therefore, the target protein can be quantitatively detected by reading the length-quantifiable visual bar in a microfluidic channel by the naked eyes. Of note, a novel two-step competition assay was utilized to achieve the highly sensitive and specific CRP detection with a limit of detection (LOD) of ~ 32 pg/mL, and a wide detection range from 100 pg/mL to 10 µg/mL. The developed method also showed high selectivity , good accuracy and great stability to different temperature and incubation time. More importantly, the design of the sensor could be applicable for detecting any other biomarkers feasibly, thus providing a universal platform for visual, sensitive and economic clinical biomarker measurement by the naked eyes for POCT applications without any auxiliary equipment .
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RSC Advances
·
2022
·Vol. 12
·期 17
·10634-10645
·
IF 4.036
Wenhao Jiang,Junli Wang,Xuanbing Wang,Jiang Liao,Jinlong Wei,Ruidong Xu,Linjing Yang
The conventional Pb–Ag alloy possesses a high oxygen evolution reaction overpotential, poor stability, and short service life in acidic solutions, making it an unsuitable sort of anode material for the zinc electrowinning process. Therefore, a layered carbon-covered cobalt tetroxide (Co3O4@C)-reinforced PbO2-coated electrode is fabricated via a facile two-step pyrolysis-oxidation and subsequent electrodeposition process. As a result, the reinforced PbO2-coated electrode exhibits a low OER overpotential of 517 mV at 500 A m−2 and a Tafel slope of 0.152 V per decade in a zinc electrowinning simulation solution (0.3 M ZnSO4 and 1.53 M H2SO4). The reduced overpotential of 431 mV at 500 A m−2 compared to traditional Pb–0.76%Ag alloy leads to improved energy savings, which is attributable to the presence of Co3O4@C to refine the grain size and thus increase the effective contact area. Moreover, the reinforced PbO2-coated electrode has a prolonged service life of 93 h at 20 000 A m−2 in 1.53 M H2SO4. Therefore, an accessible and efficient strategy for preparing a coated electrode to improve OER performance for zinc electrowinning is presented in this research.
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CHEMICAL ENGINEERING RESEARCH & DESIGN
·
2022
·
IF 4.119
Chunying Li,Fang Nie,Changyin Feng,Mengfei Tian,Meiting Yu,Chunjian Zhao,Yujie Fu
A creative dual-template molecularly imprinted polymer (Fe 3 O 4 @MCM-41-MIPs) with good magnetic properties and specific recognition of echinacoside and acteoside was prepared by surface imprinting. Echinacoside and acteoside served as dual templates, 4-vinylpyridine (4-VP) was used as a functional monomer , the cross-linker was ethylene glycol dimethacrylate (EGDMA), and the selected initiator was azobisisobutyronitrile (AIBN). The prepared Fe 3 O 4 @MCM-41-MIPs were applied to the selective separation and enrichment of echinacoside and acteoside from Cistanche deserticola Y. C. Ma ( C. deserticola ). The resulting Fe 3 O 4 @MCM-41-MIPs were characterized by scanning electron microscopy (SEM), transmission electron microscopy (TEM), Fourier transform infrared spectroscopy (FT-IR), laser particle size scanning and vibration sample magnetometry (VSM). The results of the isotherm adsorption experiment showed that the maximum adsorption capacities of Fe 3 O 4 @MCM-41-MIPs for echinacoside and acteoside were 6.02 and 1.63 mg·g -1 , respectively, at 298 K. The pseudo-second-order reaction mechanism showed that the equilibrium adsorption capacities of Fe 3 O 4 @MCM-41-MIPs for echinacoside and acteoside were 4.81 and 0.93 mg·g -1 , respectively. The characterization of Fe 3 O 4 @MCM-41-MIPs showed that the imprinted layer with dual-template molecules was wrapped on the outside of the carrier, and the obtained Fe 3 O 4 @MCM-41-MIPs showed good saturation magnetization , desirable capacity for echinacoside and acteoside adsorption, and satisfactory reuse (echinacoside and acteoside maintained relative adsorption rates of 97.5% and 95.8% after five cycles). After separation, the purities of echinacoside and acteoside were 33.50% and 27.00%, respectively. In addition, in the selective adsorption experiment, the synthesized Fe 3 O 4 @MCM-41-MIPs showed better selectivity for echinacoside and acteoside than their structural analogs. Therefore, this method proved to be sustainable, rapid and highly efficient for the separation and enrichment of echinacoside and acteoside.
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SENSORS AND ACTUATORS B-CHEMICAL
·
2022
·
IF 9.221
Luping Feng,Lixiang Zhang,Yushuang Gong,Zhongling Du,Xi Chen,Xiaoyu Qi,Xiaoqing Zhang,Guojiang Mao,Hua Wang
C@MoS 2 nanocomposites with hollow nanotube structures were synthesized through the hydrothermal sulfuration of molybdenum precursor along with the carbonization of glucose. Interestingly, it was found that the so-obtained C@MoS 2 nanzymes could specifically exhibit much enhanced oxidase-like catalysis after the addition of Hg 2+ . Herein, carbon might not only play a role in accelerating charge transfer, but also conduct the synergistic effects with MoS 2 to provide more catalytic active sites of nanzymes as compared with pristine MoS 2 . Especially, the introduction of Hg 2+ could induce C@MoS 2 nanozyme to produce more quantities of highly oxidative superoxide radicals through the strong Hg-S chelation in the catalysis reactions, as confirmed by the electron spin-resonance spectroscopy, X-ray photoelectron spectroscopy, photoluminescence spectra , and radical capturing experiments. A catalysis-based colorimetric platform with C@MoS 2 nanozyme was thereby constructed for the quantitative analysis of Hg 2+ ions, showing linear responses to Hg 2+ in the range of 0.010–100 μM with the detection limit of 2.7 nM, which is lower than those of current analysis methods. More importantly, the proposed colorimetric assay could be applied for detecting Hg 2+ in environmental wastewater with the satisfactory detection recoveries, showing great potential applications for environmental monitoring, biomedical sensing, and food detection fields.
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