JOURNAL OF MEMBRANE SCIENCE
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2020
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IF 7.183
Jingjing Zhao,Yu Yang,Jiazheng Jiang,Satoshi Takizawa,Li'an Hou
This study evaluated the impacts of cross-linking agents with different molecular weight (MW) on the structure of graphene oxide (GO)/carbon nanotubes (CNTs) layers and fouling mechanisms. The GO/CNTs-modified membrane was fabricated by chemical activation and vacuum filtration methods and exhibited excellent stability in antifouling performance and rejection rates. Increasing the external diameter of CNTs and MW of cross-linking agents improved the water flux through enlarging the interlayer spacing of GO/CNTs layers, showing the highest water flux of about 1280 kg/m 2 h. The large external diameter of CNTs deteriorated the antifouling performance and removal efficiency. The small cross-linking agents, i.e. ethanediamine with 60.1 Da or polyethyleneimine with 600 Da, maintained the regular lamellar structure of GO/CNTs layers, causing the high flux and DOC rejection. However, polyethyleneimine with 1800 Da promoted GO/CNTs aggregation and created non-uniform lamellar structure with high surface roughness , resulting in the severest flux decline and the lowest DOC rejection. The fouling model was also influenced by the MW of cross-linking agents; the small agents caused complete blocking while the large agent caused intermediate fouling for humic acid (HA) solution. The bridging effect of Ca 2+ resulted in intermediate fouling for all the membranes in the case of HA + Ca 2+ solution.
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高影响因子
RARE METALS
·
2021
·Vol. 41
·期 2
·650-662
·
IF 4.003
Guo Hua,Li Jun,Zou Xian-Rui,Wang Hong-Shui,Kang An,Zhou Huan,Li Ming-Jun,Zhao Xiao-Yan
Abstract Development of photocatalytic materials able to profit from the whole spectrum of sun for efficient organic pollution removal and bacterial elimination is a fascinating strategy in environmental engineering. In current work, GO-TiO 2 /(Ca,Y)F 2 :Tm,Yb, a full-spectrum composite photocatalyst, was prepared via hydrothermal processing with TiO 2 /(Ca,Y)F 2 :Tm,Yb particles deposited on the surface of graphene oxide (GO). The surface properties of GO-TiO 2 /(Ca,Y)F 2 :Tm,Yb were characterized using various characterization techniques including X-ray diffraction (XRD), scanning electron microscopy (SEM), X-ray photoelectron spectroscopy (XPS) and Brunauer–Emmett–Teller (BET) surface area analyzer. Besides, ultraviolet–visible (UV–Vis) diffuse reflectance spectroscopy, electron spin resonance (ESR) and other methods were used to systematically explore the photocatalytic mechanism of GO enhancement of TiO 2 /(Ca,Y)F 2 :Tm,Yb. In photocatalytic degradation study, the degradation rate of methyl orange (MO) was improved by 40% when GO was added into the TiO 2 /(Ca,Y)F 2 :Tm,Yb system. In addition, the presence of GO also improves the antibacterial ability of TiO 2 /(Ca,Y)F 2 :Tm,Yb against Escherichia coli and Staphylococcus aureus . All results reveal high efficacy of GO-TiO 2 /(Ca,Y)F 2 :Tm,Yb under full spectrum light irradiation, in which (Ca,Y)F 2 :Tm,Yb and TiO 2 can improve its utilization of full spectrum sunlight, and GO can enhance adsorption ability of dye and electron–hole pair differentiation ability of TiO 2 /(Ca,Y)F 2 :Tm,Yb. Graphic abstract
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CHEMICAL ENGINEERING JOURNAL
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2019
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IF 8.355
Zhao-Hui Zhang,Jian-Wang Zhang,Cheng-Fei Cao,Kun-Yu Guo,Li Zhao,Guo-Dong Zhang,Jie-Feng Gao,Long-Cheng Tang
Frequent fire disasters have not only caused massive casualties, irreparable property and priceless artefacts loss, but also create severe environmental damage. Therefore, it is imperative, but also challenging, to obtain excellent fire resistance and efficient early-warning alarm response in precombustion of combustible materials. In this work, a green flame-retardant graphene oxide (GO) based paper/coating is designed and constructed via using a facile 3-methacryloxypropyltrimethoxysilane and L-ascorbic acid (LAA) co-functionalization strategy. The optimized co-modified GO network shows good structure stability and improves the flame retardancy of combustible materials. Further, such GO network can provide an ultrafast flame detection signal of only ~1 s and ideal fire early warning responses (e.g. a low responsive temperature of ~120 °C and an extremely rapid responsive time of ~7 s at 300 °C) in precombustion which are among the best performances of the state-of-the-art fire alarm sensors. Moreover, the transformation of silane molecules into a compact protective layer on sheets and the resistance transition of insulating GO network into conductive reduced GO path promoted by LAA molecules are clarified. This work provides a novel strategy and paradigm to achieving excellent flame resistance and ideal fire early warning response of GO network for fire safety and prevention applications.
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高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
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2019
·
IF 4.175
Juan Liu,Zhujian Huang,Jie Sun,Yixuan Zou,Beini Gong
In this study, thiourea reduced graphene oxide/NaA zeolite composite (tGO-Zeo) was successfully prepared by a facile two-step synthetic route and used as an efficient adsorbent for removal of Cd(II) from aqueous solution. Characterization of the composite material showed that tGO was entrapped within zeolite crystalline particles and intimately interacted with the zeolite framework. Furthermore, the presence of tGO considerably reduced zeolite crystal size and altered crystal morphology, turning cubic zeolite crystals of micrometer size into nanometer irregular particles. Batch adsorption experiment for Cd(II) removal was conducted and the adsorption performance of tGO-Zeo and Zeo (zeolite) were determined. It was shown that doped tGO significantly enhanced the adsorption capacity of zeolite by 31.54%. The adsorption mechanism differs for tGO-Zeo and Zeo, and tGO-Zeo has higher affinity for Cd(II). The adsorption capacity of tGO-Zeo with a tGO doping amount of 1.26% (wt%) was estimated to be 196 mg/g (1.74 mM/g) at 30 °C and superior to most previously reported zeolite based composites, which often contain large amounts of dopants . The effects of pH and ionic strength on adsorption suggest that ion exchange and coordination are responsible for Cd(II) adsorption by tGO-Zeo. Humic acid can slightly increase Cd(II) adsorption performance of tGO-Zeo, which may be due to tGO-Zeo—humic acid—Cd(II) complexes formation. Therefore, tGO-Zeo composite is a cost-effective and eco-friendly adsorbent for efficient removal of Cd(II) ions from aqueous solutions.
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高影响因子
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
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2019
·
IF 4.784
Qingmei Yu,Zhou Wang,Yewang Zhang,Ruijiang Liu
Magnetic Ni 0.5 Zn 0.5 Fe 2 O 4 @SiO 2 nanocomposite was prepared via the rapid combustion process, and its surface was modified to obtain amino-functionalized magnetic Ni 0.5 Zn 0.5 Fe 2 O 4 @SiO 2 -NH 2 nanocomposite. The modified nanocomposite was loaded on graphene oxide (GO), on which penicillin G acylase (PGA) was covalently immobilized. The structure for docking was visualized between PGA and penicillin G using the PyMol program, which revealed the configuration of the active site. Selections of immobilization conditions including immobilization concentration and time of fixation, were explored. The catalytic performance of the immobilized PGA was characterized. The immobilized and free PGA had the highest activity at pH 8.0 and 45 °C. Compared with the activity of the free PGA, the activity of the immobilized PGA was affected less by pH and temperature. The immobilized PGA exhibited the high-effective activity and good stability. V max and K m of immobilized PGA were 0.8123 mol·min −1 and 0.0399 mol·L −1 , respectively. Free PGA's V max and K m were 0.6854 mol·min −1 and 0.0328 mol·L −1 . Immobilized PGA remained >70% in relative activity after 9 successive cycles.
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PubMed
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2018
·
IF 3.927
Yilin Wu,Chunxiang Li,Minjia Meng,Peng Lv,Xinlin Liu,Yongsheng Yan
Herein, the GO/TiO 2 -based molecularly imprinted nanocomposite membranes (GT-MIMs) with high selectivity and constitutionally structural stability were developed by by the incorporation of polydopamine (pDA) membrane modification technique and the simple vacuum filtering method. Instead of constructing imprinted polymers onto pristine membrane surfaces, a versatile filtering strategy was conducted on the membrane surfaces by using GO and TiO 2 as the nanocomposite structures. And the GT-MIMs were finally obtained after a two-step-temperature imprinting process by using propranolol as the template molecules. Moreover, attributing to the formation of this membrane-based multilevel nanocomposite surfaces, largely enhanced propranolol-rebinding capacities (53.44 mg/g), permselectivity (separation factors were all more than 16.5) and structural stability (still maintained 92% of the maximum adsorption capacity after 11 cycling operations) were easily achieved. These results strongly illustrated that this GO/TiO 2 -based imprinting membrane materials would achieve both the high rebinding capacity and the excellent permselectivity. All the synthesis processes were carried out at low temperature and ordinary pressure, which were energy-efficient and environmentally friendly for large-scale application.
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Nano Materials Science
·
2024
·
IF 12.6
Sang Xiong,Chenyi Yan,Yue Qi
A solvothermal approach was used to generate N-doped graphene oxide quantum dots (NGOQDs) using MoS 2 and Al 2 O 3 nanocomposites. Through the use of TEM, XRD, Raman, ATR-FTIR, and XPS, the produced composites' shape, composition, and structure were described. Tribological behavior and lubrication properties of NGOQDs-MoS 2 and NGOQDs-Al 2 O 3 nanocomposites as additive in nanofluids during hot roll cladding of copper and steel were studied and rolling lubrication mechanism was disclosed. The outcome demonstrates that tribological performance may be greatly enhanced by combining NGOQDs, and surface quality of the rolled copper and steel, and the addition of NGOQDs-MoS 2 and NGOQDs-Al 2 O 3 nanoparticles can further improve the hot-rolling lubrication properties. The tribofilm, formed through the tribochemically induced lubrication process, significantly enhances the wear and corrosion resistance of rolled copper and steel surfaces.
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PROCESS SAFETY AND ENVIRONMENTAL PROTECTION
·
2024
·
IF 6.9
Xunke Zhao,Kaihuan Nie,Fuyi Sun,Cheng Xie,Yanran Cheng,Yuanyuan Che
Nanofiltration holds promise for treating dyeing and printing wastewater on account of its key merits: low consumption, easy manipulation, and absence of secondary contamination. In this study, the fabrication of a uniform permselective ZIF-8@GO composite membrane in the alumina ceramic tube by the continuous flow combined with in situ self-assembly way was investigated. Subsequently, the properties of ZIF-8@GO membrane were examined in relation to reaction time, reaction temperature, flow rate, and GO concentration. Furthermore, the durability of the membrane was tested. It was observed that under optimal conditions, the rejection rate and permeation flux of methyl blue solutions remained essentially constant during 24 hours of continuous operation, with values of 98.39% and 38.27 L/(m 2 ·h·bar), respectively. This work aims to simplify and smoothly implement the industrialized production of MOF-based composite membranes and offers a potential solution for the low-cost and efficient treatment of organic dye wastewater in the printing and dyeing industry.
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高影响因子
JOURNAL OF FOOD COMPOSITION AND ANALYSIS
·
2024
·
IF 4
Lijun Yin,Peipei Xu,Junjie Ren,Jing Shi,Runbing Huang,Yunzhen Liu,Yudong Lu,Ruiyun You
Stonehouse clam toxin (STX) is a prevalent neuroparalytic toxin found among shellfish toxins . When consumed by humans, it disrupts neuronal conduction , potentially leading to quadriplegia , headache , shock, and even respiratory failure-induced death. This study introduces a highly sensitive and specific method for detecting shellfish toxins . The approach involves utilizing graphene gold-loaded compounds alongside stone house clam toxin aptamers and their complementary chains. The layered structure of graphene creates numerous hot spots among nanoparticles , while its arched spatial configuration offers an enhanced specific surface area , resulting in improved Surface-Enhanced Raman Scattering (SERS). By combining the signaling molecule Bodipy R6G-modified Apt with GO-Au loading compounds, distinctive Raman characteristic peaks emerge. Due to the strong affinity between Apt and STX, the Apt carrying the signaling molecule migrates away from the SERS aptamer probe's surface, thereby attenuating the original SERS signal intensity and facilitating ultra-sensitive shellfish toxin detection. The detection limit for the toxin was determined to be 5.47 nM, with a recovery rate ranging from 97.60 % to 108.32 %, affirming the applicability of this design for quantitative and specific shellfish toxin detection, signifying its considerable practical significance.
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高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2025
·
IF 13.2
Wenqi Zhao,Yue Qiao,Hang Jia,Yu Zhang,Enmao Zhang,Xigao Jian,Cheng Liu
The interfacial bonding between carbon fiber (CF) and the matrix in carbon fiber-reinforced high-performance thermoplastic (CFRHPTP) composites is weak, owing to the chemical inertness of the CF surface and nonreactivity of the thermoplastic resin. Hence, the applications of these composites are severely limited. In this study, a 2D GO/3D NH 2 -UiO-66 nanohybrid coating was hierarchically assembled via a two-step method. First, GO was assembled on CF (G-CF) via electrophoretic deposition to provide nucleation sites, and the NH 2 -UiO-66 was assembled in situ on the G-CF surface to obtain modified CF (G-N-CF) via electrochemical deposition. The chemical compositions, surface morphologies, and wettabilities of the CFs were systematically analyzed. Using poly(bisphthalazinone ether sulfone ketone) (PBPESK) as a matrix, a series of CF/PBPESK composites were prepared using G-N-CF, G-CF, and D-CF. The flexural strength and interlaminar shear strength of the G-N-CF-2/PBPESK composite increased by 28.5% and 48.3%, respectively, compared with those of the D-CF/PBPESK composite. The interfacial failure mechanism changed from adhesive failure to cohesive failure after treating CF with the 2D GO/3D NH 2 -UiO-66 nanohybrid coating. This study provides an effective strategy for the interphase design of CFRHPTP composites based on multiple physical and chemical interactions.
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Materials
·
2021
·Vol. 15
·期 1
·206
·
IF 3.623
Shan Cheng,Nan Li,Yuxi Pan,Bing Wang,Haoyue Hao,Fangyuan Hu,Cheng Liu,Yousi Chen,Xigao Jian
This study focused on the faint interface bonding between carbon fiber (CF) and poly(phthalazinone ether ketone) (PPEK) thermoplastic, a multistage hybrid interface layer was constructed via the condensation reaction of N-[3-(Trimethoxysilyl)propyl]-N,N,N-trimethylammonium chloride (KHN+) and the electrostatic adsorption of graphene oxide (GO). The influence of the contents of GO (0.2 wt%, 0.4 wt%, 0.6 wt%) on the interfacial properties of composites was explored. FTIR, Raman spectra, XPS tests indicated the successful preparation of CF-KHN+-GO reinforcements. The multistage hybrid interface layer significantly increased fiber surface roughness without surface microstructure destruction. Simultaneously, polarity and wettability are remarkably improved as evidenced by the dynamic contact angle experiment. The interlaminar shear strength (ILSS) and flexural strength of the CF/PPEK composites with 0.4 wt% GO (CF-KHN+-4GO) were 74.57 and 1508 MPa, which was 25.2% and 23.5% higher than that of untreated CF/PPEK composite, respectively. Dynamic mechanical analysis proved that CF/GO/PPEK composites have excellent high-temperature mechanical properties. This study furnishes an unsophisticated and valid strategy to build an interface transition layer with a strong binding force, which would offer a new train of thought in preparing high-performing structural composites.Keywords:carbon fiber;thermoplastic composites;interface/interphase;graphene;silane
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高影响因子
MICROCHEMICAL JOURNAL
·
2019
·
IF 3.206
Lu Huang,Wanxiang Yu,Xiaojing Guo,Yejing Huang,Qing Zhou,Haiyun Zhai
A new technique for simultaneous determination of tetracycline (TC), chlortetracycline (CTC), doxycycline (DC) in egg samples was developed by using radiant-type multi-molecularly imprinted solid-phase extraction (MISPE)-PDMS/glass array chip coated magnetic graphene oxide (Fe 3 O 4 /GO). Three kinds of molecularly imprinted polymers coated Fe 3 O 4 /GO (Fe 3 O 4 /GO-MIPs) were synthesized by in situ polymerization using TC, CTC and DC as single templates, respectively. The Fe 3 O 4 /GO-MISPE monolithic columns exhibited high affinity and specificity to TC, CTC and DC, as detected by high performance liquid chromatography coupled with fluorescence detection. Moreover, the radiant-type array extraction chip showed excellent adsorption capacity and particular selectivity to TC, CTC and DC, with the enrichment factors reaching 86–104 folds. Fe 3 O 4 /GO-MIPs were tested by scanning electron microscopy and Fourier transform-infrared spectroscopy. The limit of detection for TC, CTC and DC was 3.0–5.5 μg kg − 1 . Therefore, the chip-based imprinted monolithic array columns are promising for facile extraction of TC, CTC and DC from egg samples.
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高影响因子
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