JOURNAL OF FLUORESCENCE
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2022
·Vol. 32
·期 3
·927-936
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IF 2.525
Cui Hanyue,Lu Huan,Yang Jing,Fu Yao,Huang Yan,Li Li,Ding Yaping
In this paper, a fluorescent aptamer sensor was constructed based on the carbon dots (CDs) and graphene oxide (GO). This sensor combines the excellent fluorescence performance of CDs with the high specificity of aptamer, which can detect progesterone (P 4 ) with high sensitivity and selectivity. In the absence of P 4 , the CDs-aptamer system and GO form a fluorescence resonance energy transfer process (FRET), which quenches the fluorescence of the CDs. When P 4 is added, the aptamer specifically binds to it, resulting the fluorescence of the CDs is recovered. At optimal conditions, the fluorescence intensity recovered by the CDs has a linear relationship with the concentration of P 4 in the range of 0.1–120 nM and the detection limit is 3.3 × 10 –11 M. Besides, the sensor has satisfactory detection results of P 4 in milk, indicating that constructed method has enormous potential for application in food safety.
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高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
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2022
·Vol. 33
·期 7
·3965-3981
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IF 2.779
Ahmed Arsalan,Jia Yunming,Deb Hridam,Arain Muhammad Fahad,Memon Hafeezullah,Pasha Khalid,Huang Yi,Fan Qinguo,Shao Jianzhong
The use of piezoelectric materials has been increased due to the growing demand for wearable devices. Herein, we report the development of new copolymer poly (vinylidene fluoride-co-trifluoroethylene) (PVDF-TrFE)-based reduced graphene oxide (rGO) and multiwalled carbon nanotubes (MCNTs) loaded electrospun (E-Spun) nanofibers. The rGO-MCNTs loaded PVDF-TrFE nanofibrous mat led to the fabrication of ultra-sensitive piezoelectric pressure sensors for potential wearable health monitoring applications. The doped PVDF-TrFE solution of different weight percentages of rGO-MCNTs as fillers was prepared and used to fabricate an e-spun nanofibrous mat. Complete characterization of resultant materials were carried through diverse instruments which reveals the successful integration of rGO-MCNTs (3.2%) as a dopant that improved the β-phase up to 92%. The DSC analysis further exposes the high thermal stability of the PVDF-TrFE nanofibers mat due to the enhanced crystallinity with the addition of nanofillers. The newly developed sensor’s overall output (based on sensitivity) was calculated under a variable applied pressure range of 0.25 ~ 300 cN at 50 HZ. Results show that the pressure sensor response has improved from 16.125 ~ 0.430 kPa −1 , corresponding to a higher sensitivity under static and dynamic forces in the applied pressure range. These results are of a fundamental study and open new prospects for the hybrid nanofibrous mat as alternative electrode material in the piezoelectric pressure sensor.
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ENVIRONMENTAL RESEARCH
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2022
·
IF 8.431
Yong Cheng,Han-Qing Zhao,Aqiang Ding,Fei Chen,Jun Liu,Dazhi Fang,Chenglong Li,Yongkui Huang,Peili Lu
The widespread application of quaternary ammonium compounds (QAC) has posed a serious hazard to the environment and human being, and high concentration of Cl − in QAC wastewater may further increase the difficulty of pollutants elimination . In this study, such a QAC wastewater under high salinity conditions was chosen as the target, the prepared Ti/(Ru x Ir y )O 2 anode exhibited favorable catalytic performance for the oxidation and mineralization of QAC under high salinity conditions. Increasing the Ru/Ir ratio of Ti-based electrode coating also slightly promoted the inner catalytic capacity. The combination of electron paramagnetic resonance (EPR) and quenching experiments indicates that 1 O 2 served as a main reactive specie in the Ti/(Ru x Ir y )O 2 electrooxidation system. The increase of pH could decrease the removal efficiency of QAC for the reduced 1 O 2 yield, and the rise of Cl − concentration could favor the QAC oxidation, and Cl − was a better electrolyte to promote the oxidation of organic contaminants when compared to Na 2 SO 4 or Na 2 CO 3 . Additionally, the conversion pathway of the model pollutant was tentatively investigated, the results demonstrated that there were almost no halogenated final products residual by electrocatalytic oxidation with Ti/(Ru x Ir y )O 2 anode. This study not only elucidate the reaction mechanism of Ti/(Ru x Ir y )O 2 anode electrocatalytic oxidation of high salinity QAC wastewater, but also may provide an efficacious and eco-friendly method for the treatment of high salinity QAC wastewater.
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SEPARATION AND PURIFICATION TECHNOLOGY
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2022
·
IF 9.136
Lei Qiao,Hui Ye,Qingping Xin,Lilan Huang,Yuzhong Zhang,Hong Li
A sulfonated polyethersulfone/functionalized graphene membrane (SPES/CSrGO) was developed through a facile ‘one-pot’ method for hardness removal. The concentrated sulfuric acid (H 2 SO 4 ) was used as both sulfonating agent for PES materials and solvent for preparing casting solution of SPES/CSrGO. The sulfonic acid group of SPES could form hydrogen bond with carboxyl group on CSrGO, improving the dispersibility of CSrGO in membrane. The SPES/CSrGO membrane with uniform dispersion of CSrGO showed good adsorption–desorption behavior in static adsorption. The SPES/CSrGO membrane with CSrGO content of 30 wt% (SPES/CSrGO-30) showed the highest static adsorption capacities for Ca 2+ (82.52 mg/g) and Mg 2+ (74.21 mg/g), respectively. In artificial seawater, the SPES/CSrGO-30 membrane also exhibited good adsorption performance and the adsorption capacities of Ca 2+ and Mg 2+ reached 26.27 mg/g and 50.1 mg/g. In dynamic adsorption, the adsorption capacities of SPES/CSrGO-30 for Ca 2+ and Mg 2+ were 43.63 mg/g and 34.29 mg/g, respectively. More importantly, the hydrophilicity CSrGO endowed the excellent antifouling property of SPES/CSrGO membrane. This strategy showed a high potential for the removal of hardness during the ultrafiltration process and provided a promising direction to the design of high-performance adsorptive membranes.
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ACS Applied Electronic Materials
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2022
·
IF 4.494
Chao Liu,Wei Wu,Qiming Chen,Yi Wang,Sufei Cui,Hong Yang
At present, dual-functional polymer composites possessing excellent thermal conductivity and high electromagnetic interference shielding effectiveness (EMI SE) are largely demanded in the synchronous thermal and EM wave management of advanced microelectronic devices. Herein, we report an annealed 3D expanded graphite (A-3D-EG) framework featuring high-quality continuous carbon architectures that can serve as high-throughput phonon and electron transmission pathways to effectively elevate the thermal conductivity and EMI shielding performance of polymers. This framework is fabricated via hydrothermally treating the aqueous slurry containing EG and GO fillers, followed by freezing-drying and annealing treatment at 1600 °C for 2 h. As a result, the polydimethylsiloxane composite filled with A-3D-EG reveals an outstanding thermal conductivity of 12.95 Wm–1K–1 and a high EMI SE of 85.0 dB at a low filler content of 31.9 wt %. This work demonstrates that A-3D-EG has enormous utilization potential in fabricating polymer composites simultaneously with high thermal conductivity and outstanding EMI shielding capability, which can be utilized in aerospace, telecommunications, and mobile electronic devices.
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MICROCHEMICAL JOURNAL
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2022
·
IF 5.304
Hongli Zhang,Feilong Hao,Zhifang Yao,Junling Zhu,Xu Jing,Xiaowen Wang
Deep eutectic solvents (DESs) are becoming eco-friendly alternatives for extracting biologically-active substances from natural products. In this study, a DES is used as an eco-friendly solvent to extract flavonoids from Polygonatum sibiricum with the assistance of ultrasound. The antioxidant activity of the extracts was then investigated and the recyclability and reusability of the DES evaluated. Optimizing the DES extraction process produced the following optimum conditions: a betaine–acetic acid molar ratio of 1:4, water content of 30%, solid–liquid ratio of 1: 100 g mL −1 , extraction temperature of 50 °C, and extraction time of 30 min. The yield of extracted flavonoids reached 25.4 mg g −1 , which is about eight times that achieved using ethanol extraction. Furthermore, the antioxidant ability of the DES extract was more potent than that of the extract obtained using ethanol. Used DES can be efficiently recovered using ultrahigh capacitance porous activated carbon (the recovery yield of DES was around 92% of that of the original DES after ten reuses). In conclusion, DESs can be used to establish green ultrasound-assisted extraction methods for efficient extraction of plant flavonoids.
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JOURNAL OF MATERIALS SCIENCE
·
2022
·Vol. 57
·期 1
·598-617
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IF 4.682
Meng Minjia,Zheng Jian,Cui Yanhua,Li Binrong,Yang Lili,Zhu Yu,Li Chunxiang
The weak light absorption capacity and the embedding of active sites are the main factors that affect the photodegradation performance of blending photocatalytic membrane. Herein, a Z-scheme TiO 2 /rGO/ZnCdS/PVDF photocatalytic composite membrane (T-rGO-ZCSM) with excellent mechanical properties and good self-cleaning performance was successfully prepared by the freezing phase inversion method. As the solvent turns to crystal under freezing temperature, the micron-scale ordered penetrating porous structure formed after phase inversion, which can efficiently improve the water flux (19000–25000 L m −2 h −1 bar −1 ) and light penetration. Meanwhile, Z-scheme TiO 2 /rGO/ZnCdS heterojunctions will be migrated to the surface of the large pore canal due to their hydrophilicity during the phase inversion process. This structure can promote light absorption and increase effectively contact between active sites and pollutants. The T-rGO-ZCSM also exhibits outstanding photocatalytic activity for removing the various antibiotics under visible light, such as tetracycline (TC), levofloxacin (LEV), and ciprofloxacin (CIP). After four cycles (1.0 h for each cycle) of experiments, T-rGO-ZCSM has good stability and reusability. Moreover, the TC degradation efficiency of T-rGO-ZCSM reached the highest of 87.46% under continuous 6.0 h solar irradiation. The superoxide radical (·O 2 − ) and photogenerated h + were the main active species for organics’ degradation. In summary, the ordered penetrating type macroporous T-rGO-ZCSM has promising potentials for wider applications in wastewater treatment. Graphical Abstract
A hierarchical-ordered penetrating-type porous T-rGO-ZCSM membrane was prepared by freezing phase inversion method. The membrane surface with large pore diameters can provide a more convenient transport pathway, and pollutants can be transferred to the active sites to increase effective contact. It can also enhance the visible light absorption to excite more photogenerated carriers and improve photocatalytic activity. Finally, the photocatalytic degradation efficiency of freezing T-rGO-ZCSM could be increased by 1.71 times compared to that of the conventional blending nf-T-rGO-ZCSM under visible light.
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PROCESS SAFETY AND ENVIRONMENTAL PROTECTION
·
2021
·
IF 6.158
Longjie Liu,Qingping Wang,Jiajiang Lin,Gary Owens,Zuliang Chen
Recently, estrogen has attracted widespread concern because it is increasing being detected in wastewater treatment plants. While techniques for estrogen removal have been reported, these have mostly focused on exploring the effect on removal using simple single-factor experiments, rather than applying more complex multifactor mathematical models to wastewater treatment. In this study, reduced graphene oxide-based iron nanoparticles (rGO@Fe NPs) were used for 17α-estradiol (αE 2 ) removal based on adsorption and Fenton oxidation . A response surface methodology , based on a Box-Behnken design, was used to determine the relationships between critical operation factors (pH, temperature, αE 2 concentration, rGO@Fe NPs dose and H 2 O 2 concentration) and removal efficiency to establish the optimal conditions for 1 mg L −1 αE 2 removal. Under the determined optimal reaction condition of pH 6.0, temperature 40 °C, 0.08 g L −1 rGO@Fe NPs dose and 6 mM H 2 O 2 , a maximum removal efficiency of 99.9% was obtained. Subsequently, the presence of co-existing anions (Cl − , SO 4 2− and NO 3 − ) significantly decreased the removal efficiency of αE 2 . However, αE 2 removal from domestic wastewater could be increased by 38.0% when applying RSM results. Moreover, αE 2 removal by rGO@Fe NPs remained stable over five reuse cycles indicating that rGO@Fe NPs would be an efficient and practical advanced materials for αE 2 removal.
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SENSORS AND ACTUATORS B-CHEMICAL
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2021
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IF 7.46
Minglu Zhang,Man Wang,Xiaojun Zhang,Chengwei Zhang,Manhong Li,Sujun Yu
Ionic polymer-metal composites (IPMCs) composed of Nafion film and platinum deposited on both faces have gained much attention in biomedical engineering as actuators because it can show large bending motion under an electric field. This study focuses on the design of a multilayered IPMC actuator based on sulfonated graphene oxide (SGO) modified macroporous Nafion film. The Nafion film is firstly fabricated via templating technique by using silica spheres as template and SGO as a conductive agent dispersed in Nafion film. Then, Pt nanoparticles are deposited on both faces of the as-prepared Nafion film to fabricate the actuator (denoted as IPMC-SGO-M). In the IPMC-SGO-M, macropores and SGO co-exist in the Nafion film, which can effectively enhance the rapid transport of ions and electrons. In addition, small Pt nanoparticles are uniformly dispersed on the surface of the Nafion film, which can improve the water-uptake capability and charge redistribution between two layers of electrode regions. As a result, the tip displacements of the IPMC-SGO-M are 1.7-fold and 1.9-fold higher than that of the IPMC based on macroporous Nafion film (IPMC-M) under 6.2 and 6.6 V, respectively. The blocking forces of the IPMC-SGO-M are about 2.6-fold and 2.3-fold higher than that of IPMC-M under 6.2 and 6.6 V, respectively.
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JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS
·
2021
·
IF 3.995
Ruidong Song,Taixin Liang,Yanli Guo,Chao Wang,Fei Xiao,Wei Liu,Jiangbo Zhang
The preparation of catalysts with small particle size, large specific surface area and high atomic utilization has always been the focus of research in the field of catalysis. As for energetic materials, catalysts are always used to improve the thermal decomposition performance of ammonium perchlorate (AP) as it has significant effect on the power of engine. In this work, a two-dimensional metal clusters catalyst has been successfully prepared by solvothermal and heat treatment to improve thermal decomposition performance of AP. In detail, the transition metal ions were supported on the graphene oxide (GO) surface by organic ligands linking, followed by heat treatment to obtain two-dimensional rGO based metal clusters catalyst. The morphology and structure of the catalysts at different temperatures and their effect on AP decomposition were studied, the results show that catalyst at 300 °C has a particle size of 20 nm and uniformly distributed on rGO. The catalyst promotes the high temperature decomposition of AP by 73.7 °C with improved stability, and increases the heat release from 652.73 J/g to 1392.11 J/g. This may be attributed to good conductivity of GO and the strong gain-loss electron ability of the metal clusters. The presence of GO increased the active sites for cluster catalysis, additional, the metal clusters have a positive synergistic effect with GO. Thus, the thermal decomposition performance of AP was enhanced meanwhile thermal stability can also be improved.
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Journal of Environmental Chemical Engineering
·
2021
·
IF 5.909
Faguang Ma,Yilin Wu,Qingyan Guo,Rongxin Lin,Kaicheng Zhang
Herein, according to the polydopamine (PDA)-based imprinting and thermal-induced imprinting methods, we reported on the development and applications of double-layer-imprinted mixed matrix membranes (DI-MMMs) through a dual-imprinted strategy, thereinto, the tetracycline (TC), one of the pollution-intensive pharmaceutical and personal care products , was chosen as template molecule. As to the first-TC-imprinted layer, the blended PDA-based TC-imprinted activated carbon (AC) and SiO 2 were both used for the preparation of membrane. Next, κ-carrageenan-modified graphene oxide (GO) nanosheets would be regarded as the surface-loaded layer to support the thermal-induced imprinting synthesis (second-TC-imprinted layer). Importantly, high adsorption capacity at around at 106.44 mg/g and fast adsorption rate (within 60 min) had been successfully obtained. Importantly, permselectivity rates ( β ) of our imprinting membranes were obtained as 3.60, 3.33 and 3.51, respectively. Overall, based the practical selective separation and scalability analysis, we believed that the as-prepared DI-MMMs with high-intensitive recognizability and permeability of template molecule would provide a possibility for breaking the permeability-selectivity trade-off of molecularly imprinted membrane materials.
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Journal of Environmental Chemical Engineering
·
2023
·
IF 7.7
Chengbao Geng,Fangbo Zhao,Hongyan Niu,Jiaming Zhang,Yang Liu,Lijia Liu,Hongxing Dong,Zhiguo Li,Hongxu Chen
Loose nanofiltration membrane exhibits significant advantages in removing organic pollutants due to its high selectivity at a lower operating pressure. Herein, a novel zwitterionic loose polyamide separation layer was designed and formed on the modified polyethersulfone substrate to obtain the zwitterionic loose nanofiltration (ZLNF) membrane with high water permeability and good antifouling properties. The BAPP-TMC polyamide layer was fabricated by the interfacial polymerization between 1,4-bis(3-aminopropyl)piperazine (BAPP) and trimesoyl chloride (TMC). Afterward, the BAPP-TMC polyamide layer was grafted with zwitterions by a facile surface modification. Owing to the fabrication of the relatively loose polyamide structure with zwitterions, the prepared ZLNF-0.2 membrane presented an ultra-high pure water permeability of 148.5 L m −2 h −1 bar −1 while maintaining relatively good removal capacities for organic pollutants. The removal rates for humic acid (HA, 100 ppm) and Congo Red (CR, 100 ppm) were 98.1 % and 97.6 %, respectively. Furthermore, the good hydrophilicity and strong surface hydration effect of zwitterions endowed the ZLNF membranes with excellent anti-organic fouling and antibacterial adhesion properties. The good antibacterial abilities of ZLNF membranes were also proved by the fluorescence staining results. Due to the effective separation performance and good antifouling properties, the fabricated ZLNF membranes present great application potential in removing natural organic matter and dyes.
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