KOREAN JOURNAL OF CHEMICAL ENGINEERING
·
2022
·Vol. 39
·期 10
·2792-2799
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IF 3.146
Liu Wenju,Bai Hongjuan,Gao Weiqiang,Chen Zihan,Liu Zhuangzhuang,Chen Zilong,Chen Junhang
A batch system was applied to investigate the behavior of adsorption of methylene blue (MB) and crystal violet (CV) from aqueous solution using a renewable magnetic alginate composite containing graphene oxide (M-GO/Alg) in single and binary systems. The surface morphology and chemical structure of the adsorbent were characterized by scanning electron microscopy (SEM), X-ray diffraction (XRD), thermogravimetric analysis (TGA), and vibrating sample magnetometer (VSM) analysis. The experimental data were fitted by the isotherm models and adsorption kinetics. And the maximum adsorption quantity of MB and CV reached 459.85 and 69.46 mg/g at 298 K for M-GO/Alg, respectively, as deduced from Langmuir model. After five successive adsorptive removal cycles for both dyes, no significant performance loss was observed for M-GO/Alg. Moreover, M-GO/Alg was easily separated under an external magnetic field. In binary system, MB and CV exhibited competitive adsorption. The obtained results suggested that M-GO/Alg can be used as an eco-friendly and recyclable adsorbent to remove cationic dyes from aqueous solutions.
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FIBERS AND POLYMERS
·
2022
·Vol. 23
·期 10
·2740-2747
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IF 2.347
Zheng Jiaojiao,Zhang Hong,Cao Tianyu,Zhu Yuanyuan,He Lizhong,Li Jianwei,Chen Xudong,Qu Yinhu
Superhydrophobic surfaces by creating surface roughness followed by coating with low-surface-energy fluorinated materials have been intensively developed on cotton fabrics. However, exploring superhydrophobic surfaces with non-fluorine components and further improving their attachment with cotton fabrics is still challenging. Herein, we developed a superhydrophobic surface on cotton fabric by dip coating with hexadecylamine (HDA) modified copper nanowires (Cu NWs) based on the coordination between Cu atoms and amine groups. The HDA modified Cu NWs not only created surface roughness, but also decreased the surface energy, leading to a superhydrophobic cotton fabric with water contact angle of 164 °±2.0 °. Furthermore, ultrasonic washing and tape peeling tests exhibited the Cu NWs were adhered tightly to the surface of cotton fibers, owing to the strong hydrogen bond between amine groups on HDA molecules and hydroxyl groups on cotton fibers. In addition, the superhydrophobic cotton fabric showed excellent antifouling, oil-water separation and infrared reflection properties. It is believed that this facile method provide promising industrial applications for fabricating superhydrophobic surfaces on other substrates.
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WATER AIR AND SOIL POLLUTION
·
2022
·Vol. 233
·期 9
·1-16
·
IF 2.984
Zhang Zhen,Zhang Haotian,Woon Kok Sin,Zhu Xiaohu,Sui Yuhong,Luo Zifeng,Chen Lili,Yang Xiaoming,Gao Junyi,Wen Hongping,Jing Ran,Liu Tongzhou
Enhanced phytoextraction of metals using amendments and hyperaccumulator plants is a promising alternative to expensive traditional remediation techniques. The present study comprehensively investigated the effects of six amendments on both mobility and phytoextraction of Cd and the feasibility of integrating amendment with Ramie as a hyperaccumulator plant on Cd-contaminated soil remediation. The leaching of Cd from contaminated soil was significantly enhanced by two chelating agents (i.e., ethylenediaminetetraacetic acid (EDTA) and ethyleneglycoltetraacetic acid (EGTA)), followed by two natural organic acids (i.e., citric acid and tartaric acid), and lastly, two rhizobacteria (i.e., Bacillus subtilis and Pseudomonas fluorescens ). Further, the application of EDTA and EGTA had inhibitory effects on the growth of Ramie. The application of two organic acids and two rhizobacteria increased the dry biomass yields of roots, stems, and leaves. In terms of the dry biomass of Ramie, 32.7, 23.4, 50.6, and 53.1% of increases were obtained from the applications of citric acid, tartaric acid, B. subtilis , and P. fluorescens , respectively, as compared with that without any amendment applied. Meanwhile, the applications of all amendments were observed to increase Cd concentrations in aerial parts of the plants, and they were ranked in descending order of Cd accumulation: EDTA > EGTA > tartaric acid > citric acid > B. subtilis ≈ P. fluorescens . Taking Cd removal efficiency, potential environmental risk, and economic factor into consideration, EDTA and citric acid-enhanced phytoremediation using Ramie were feasible and promising approaches for remediating Cd-contaminated soil in real practice.
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MICROCHIMICA ACTA
·
2022
·Vol. 189
·期 6
·1-11
·
IF 6.408
Shen Yizhong,Wei Yunlong,Liu Zhenmin,Nie Chao,Ye Yingwang
Accurate and low-cost onsite assay of residual antibiotics in food and agriculture-related matrixes (e.g., milk) is of significant importance for evaluating and controlling food pollution risk. Herein, we employed hybrid Cu-doped-g-C 3 N 4 nanozyme to engineer smartphone-assisted onsite visual sensor for reliable and precise reporting the levels of tetracycline (TC) residues in milk through π-π stacking-triggered blocking effect. Benefiting from the synergetic effects of Cu 2+ and g-C 3 N 4 nanosheet, Cu-doped-g-C 3 N 4 nanocomposite exhibited an improved peroxidase-like activity, which could effectively catalyze H 2 O 2 to oxidate colorless TMB into steel-blue product oxTMB. Interestingly, owing to the blocking effect caused by the π-π stacking interaction between TC tetraphenyl skeleton and Cu-doped-g-C 3 N 4 nanozyme, the affinity of Cu-doped-g-C 3 N 4 nanocomposite toward the catalytic substrates was remarkably blocked, resulting in a TC concentration-dependent fading of solution color. Using smartphone-assisted detection a simple, low-cost, reliable, and sensitive portable colorimetric sensor-based nanozyme for onsite visual monitoring the residual TC in milk was successfully developed with a detection limit of 86.27 nM. Of particular mention is that this detection limit is comparable to most other reported colorimetric methods and below most official allowable residue thresholds in milk matrixes. This work gave a novel insight to integrate two-dimensional (2D) artificial nanozymes-based π-π stacking-triggered blocking effect with smartphone-assisted detection for developing efficient and low-cost colorimetric point-of-care testing of the risk factors in food and agriculture-related matrixes. Graphical abstract
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PubMed
高影响因子
POLYMER BULLETIN
·
2022
·Vol. 80
·期 4
·3571-3584
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IF 2.843
Yu Li,Fan Yue,Li Chang,Liu Cailin,Ren Xianyan,Yang Haijun,Lin Shudong
In the oil–water separation, the difficulty to recover and low hydrophobicity are key limitation factors for practical applications. In this paper, we design Cobalt ferrite hybrid Polystyrene divinylbenzene microspheres (CoFe 2 O 4 /SDB), which were conducted through in situ suspension copolymerization. The CoFe 2 O 4 is prepared by low heat solid phase sol-gel method. It had been found that the CoFe 2 O 4 /SDB have a spherical structure, good adsorption behavior, highly hydrophobicity and even superhydrophobicity. The adsorption capacity of CoFe 2 O 4 /SDB composites could absorb kerosene up to 6 times of its own weight. Interestingly, kerosene can be easily separated from the surface of CoFe 2 O 4 /SDB particles with ultrasonic operation. CoFe 2 O 4 /SDB particles can still maintain good hydrophobicity and adsorption capacity of kerosene after 11 cycles after drying. With in situ polymerization of St:DVB and CoFe 2 O 4 , CoFe 2 O 4 /SDB as a promising absorbent of kerosene which has great potential in application of oil–water separation.
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JOURNAL OF POROUS MATERIALS
·
2022
·Vol. 29
·期 5
·1387-1398
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IF 2.523
Ma Jingye,Liu Xiaolong,Yuan Hong
This work employed dodecyl trimethyl ammonium bromide, sodium dodecyl benzene sulfonate (SDBS) or dodecyl dimethyl betaine (BS–12) along with a PEO–PPO–PEO (P123) block copolymer to obtain a dual template system for catalyst synthesis. Using Pt(NH 3 ) 4 (NO 3 ) 2 as the platinum source, a series of mesoporous Pt/SAPO–11 catalysts with different Pt loadings were prepared via an in situ synthesis and characterized by X-ray diffraction, specific surface area analysis, temperature programmed desorption, X-ray photoelectron spectroscopy and transmission electron microscopy. These catalysts each had a complete AEL model structure with pore diameters in the range of 8.1–10.9 nm and specific surface areas between 103 and 168 m 2 /g. At a Pt loading of 1.0 wt%, the Pt/SAPO–11–S synthesized with SDBS–P123 as the dual template showed the least Pt loss, the largest specific surface area (159 m 2 /g) and the smallest Pt particle size (6.1 nm). This material also exhibited the highest ratio of Pt metal to oxide, indicating that it contained more active metal sites. This catalyst was applied to the decarboxylation of oleic acid under CO 2 to prepare C8–C17 alkanes, the main component of biological aviation kerosene. At a reaction temperature of 340 °C and catalyst-to-oil mass ratio of 1:10, the yield of C8–C17 alkanes reached 80.6% after 6 h. This same catalyst provided a 73.8% yield after six reuses, demonstrating good stability.
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Stem Cell Research & Therapy
·
2022
·Vol. 13
·期 1
·1-16
·
IF 8.079
Meng Zhaosong,Liu Jiacheng,Feng Zhipeng,Guo Shuling,Wang Mingzhe,Wang Zheng,Li Zhe,Li Hongjie,Sui Lei
Background Dental follicle stem cells (DFSCs) show mesenchymal stem cell properties with the potential for alveolar bone regeneration. Stem cell properties can be impaired by reactive oxygen species (ROS), prompting us to examine the importance of scavenging ROS for stem cell-based tissue regeneration. This study aimed to investigate the effect and mechanism of N-acetylcysteine (NAC), a promising antioxidant, on the properties of DFSCs and DFSC-based alveolar bone regeneration.Methods DFSCs were cultured in media supplemented with different concentrations of NAC (0–10 mM). Cytologic experiments, RNA-sequencing and antioxidant assays were performed in vitro in human DFSCs (hDFSCs). Rat maxillary first molar extraction models were constructed, histological and radiological examinations were performed at day 7 post-surgery to investigate alveolar bone regeneration in tooth extraction sockets after local transplantation of NAC, rat DFSCs (rDFSCs) or NAC-treated rDFSCs.Results 5 mM NAC-treated hDFSCs exhibited better proliferation, less senescent rate, higher stem cell-specific marker and immune-related factor expression with the strongest osteogenic differentiation; other concentrations were also beneficial for maintaining stem cell properties. RNA-sequencing identified 803 differentially expressed genes between hDFSCs with and without 5 mM NAC. “Developmental process (GO:0032502)” was prominent, bioinformatic analysis of 394 involved genes revealed functional and pathway enrichment of ossification and PI3K/AKT pathway, respectively. Furthermore, after NAC treatment, the reduction of ROS levels (ROS, superoxide, hydrogen peroxide), the induction of antioxidant levels (glutathione, catalase, superoxide dismutase), the upregulation of PI3K/AKT signaling (PI3K-p110, PI3K-p85, AKT, phosphorylated-PI3K-p85, phosphorylated-AKT) and the rebound of ROS level upon PI3K/AKT inhibition were showed. Local transplantation of NAC, rDFSCs or NAC-treated rDFSCs was safe and promoted oral socket bone formation after tooth extraction, with application of NAC-treated rDFSCs possessing the best effect.Conclusion sThe proper concentration of NAC enhances DFSC properties, especially osteogenesis, via PI3K/AKT/ROS signaling, and offers clinical potential for stem cell-based alveolar bone regeneration.
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PubMed
高影响因子
JOURNAL OF POLYMERS AND THE ENVIRONMENT
·
2022
·Vol. 30
·期 11
·4835-4847
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IF 4.705
Guo Wei,Guo Ruibin,Pei Hebing,Wang Bingjie,Liu Nijuan,Mo Zunli
Electrospinning nanofiber membranes (ENMs) have received widespread attention owing to their favorable permeability, easy preparation, low energy consumption and stability in wastewater treatment technologies. Polyacrylonitrile/polyethyleneimine (PAN/PEI) ENMs were prepared by electrospinning and evaluated in batch experiments for their removal of heavy metal ions (Pb (II), Cr (VI) and Cu (II)) in water. The adsorption capacities of PAN/PEI ENMs for Cr (VI) ions, Cu (II) ions and Pb (II) ions can reach up to 262 mg g −1 , 325 mg g −1 and 346 mg g −1 , respectively. The adsorption procedure follows the pseudo-second-order dynamics model and Langmuir model. In dynamic experiments, the removal rates of Pb (II) ions, Cr (VI) ions and Cu (II) ions can reach 80%, 100% and 80%, indicating that it has excellent removal efficiencies for heavy metal ions. At the same time, PAN/PEI ENMs have high separation ability and excellent flux for oil–water mixtures and oil-in-water emulsions. PAN/PEI ENMs also have the advantages of simple preparation, easy recovery and no secondary pollution to the environment, indicating that PAN/PEI ENMs have some prospects for application in wastewater treatment.
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Journal of Coatings Technology and Research
·
2022
·Vol. 19
·期 6
·1687-1695
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IF 2.339
Wang Jinwei,Chen Yiyuan,Ma Jiao
Maleic anhydride-g-poly(1,2-butadiene) (MLPB) is used as a rubber flexibilizer to modify UV-curable polyacrylate coatings (PA) in an attempt to improve their wear resistance and water tolerance. Fourier transform infrared spectra results show that the unsaturated reactive bonds of MLPB fully participate in the UV-curing reaction and successfully copolymerized with acrylates to obtain robust coatings. The smooth and broad differential scanning calorimeter curves show that the cured systems had good compatibility and their glass transition temperatures ( T g ) increase from about 63°C to 74°C with the increase of MLPB addition up to 6 wt%. With the addition of MLPB in PA matrix, their cross-sectional scanning electron microscope (SEM) pictures show brittle features with coarser and dimpled microcracks transforming to toughened fracture morphology with particles offsetting microcrack propagation when MLPB content is added up to 4–6 wt%. The wear scar profiles show that the cross-sectional areas decrease significantly with the MLPB addition, implying the improvement in the wear-resisting ability of PA composite toughened by MLPB; the hardness, impact resistance, and adhesion could be also improved when MLPB was controlled less than 6 wt%. Compared with the pure polyacrylate coatings, the modified coatings exhibited an improvement in water resistance before and after 48-h UV aging.
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CHEMICAL RESEARCH IN CHINESE UNIVERSITIES
·
2022
·Vol. 38
·期 6
·1497-1503
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IF 2.726
Qin Yang,Yang Yunhan,He Ran,Zhou Laicheng,Zhang Ling
Enzymes containing 3′ → 5′ exonuclease activities play an important role in various key cellular and physiological processes. The development of fluorescence biosensor is an efficient method to detecting enzyme activity. Herein, a fluorescence resonance energy transfer(FRET) “on” and “off” strategy for detecting exonuclease III(Exo III) activity has been developed. We report here that the double-stranded DNA(dsDNA) enables to bind tightly to self-assembled nanosheets of cationic perylene monoimide derivative(PMI-O7) through electrostatic interaction, and the 6-carboxyfluorescein(FAM)-modified dsDNA could be efficiently quenched via FRET between FAM and PMI-O7. Upon the addition of Exo III, the dsDNA will be digested and the FAM fluorophore will be released, resulting in the fluorescence recovery of FAM. This method provides a simple and sensitive biosensor platform with a low detection limit of 0.077 U/mL for Exo III. Importantly, this method exhibits similar and calibration curves for the detection of Exo III in both buffer and fetal bovine serum samples, indicating that this platform has potential to detect Exo III activity in complex samples.
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Science China-Materials
·
2022
·Vol. 65
·期 11
·2989-2996
·
IF 8.64
Zhang Tao,Sang Zhiyuan,Yin Lichang,Han Yonghuan,Si Wenping,Yin Yuxin,Hou Feng
Lithium metal anode possesses a high theoretical capacity and the lowest redox potential, while the severe growth of Li dendrite prevents its practical application. Herein, we prepared a structure of Li 3 P nanosheets and Ni nanoparticles decorated on Ni foam (NF) as a three-dimensional (3D) scaffold for dendrite-free Li metal anodes (Li-Li 3 P/Ni@Ni foam anodes, shortened as L-LPNNF) using a facile melting method. The Li 3 P nanosheets exhibit excellent Li-ion conductivity as well as superior lithiophilicity, and the 3D nickel scaffold provides sufficient electron conductivity and ensures structure stability. Therefore, symmetric cells assembled by L-LPNNF possess lowered voltage hysteresis and improved long cycle stability (a voltage hysteresis of 104.2 mV after 500 cycles at a high current density of 20 mA cm −2 with a high capacity of 10 mA h cm −2 ), compared with the cells assembled with Li foil or Li-NF anodes. Furthermore, the full cells with paired L-LPNNF anodes and commercial LiFePO 4 cathodes suggest a specific capacity of 124.6 mA h g −1 and capacity retention of 90.8% after 180 cycles with the Coulombic efficiency (CE) of ∼100% at a current rate of 1 C. This work provides a potentially scalable option for preparing a mixed electronic-ionic conductive and lithiophilic scaffold for dendrite-free Li anodes at high current densities.
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CHINESE JOURNAL OF POLYMER SCIENCE
·
2022
·Vol. 40
·期 10
·1141-1153
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IF 3.815
Guo Xiao-Xiao,Hou Shi-Chang,Chen Jun,Liao Cong,He Wei-Dong
Incautious discharge of organic dyes such as methyl orange (MO) has produced serious pollution to the environment, calling for the efficient techniques to remove them with retaining the green world. The photo-catalytic degradation of organic dyes is promising among the developed techniques. Thus, a strategy based on transpiration-prompted photocatalytic degradation of dye pollutant under sunlight is put forward. Aniline (ANI) is graft-polymerized onto poly(acrylamide- co-N -4-aminophenylacrylamide) (PAAm) cryogel embedded with gold nanoparticles (AuNPs, diameter: 4–10 nm). The obtained cryogels integrated with AuNPs and PANI inside PAAm matrix (AuNP@PAAm- g -PANI) have been structurally explored based on the chemical composition and the phase/porous morphology. SEM and TEM observation shows that PANI and AuNPs are uniformly distributed in PAAm matrix. Since the macro-porosity of cryogel, hydrophilicity of PAAm and photo-thermal activity of PANI, PAAm-g-PANI cryogels without AuNPs can have a photo-thermal evaporation rate of water at 1.63 kg·m −2 ·h −1 . As a comparison, AuNP@PAAm- g -PANI cryogels with AuNPs exhibit higher one at 2.20 kg·m −2 ·h −1 , suggesting the promotion of AuNPs to photo-thermal evaporation. Meanwhile, PANI appreciatively assists AuNPs to display higher catalytic ability for the oxidative degradation of MO. Therefore, the removal of MO from water is obviously prompted by the water transpiration under sunlight with AuNP@PAAm- g -PANI cryogels, whose rate constant can reach to 0.320 h −1 , being three folds of that for the sole absorption of MO. This transpiration-prompted photocatalytic degradation provides a fascinating route to eliminate organic pollutants and obtain pure water from wastewater simultaneously with sustainable sunlight energy.
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