JOURNAL OF ENVIRONMENTAL MANAGEMENT
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2023
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IF 8.7
Tao Zhang,Wanling Cai,Zuliang Chen
Bio-nanocomposites have attracted increasing research attention because they are able to integrate bio- and nano-related functions, and subsequently demonstrate potentially beneficial environmental applications. Here, a functional bionanomaterial based on Burkholderia cepacian (FZ) immobilized on GO/ZIF-8 was developed and used to remove malachite green (MG), with functions based on both biodegradation and adsorption. XRD and FTIR results showed that in situ production of GO/ZIF-8 by combining Zn 2+ in ZIF-8 with the carboxyl group on the GO surface, led to FZ immobilized in GO/ZIF-8 through covalent bonding. Zeta analysis showed that the surface of FZ and GO/ZIF-8 had different charges under pH = 9.12, suggesting immobilization also occurred via electrostatic action. BET results confirmed that the specific surface area of GO/ZIF-8 was much larger than that of GO and ZIF-8, but the reduced specific surface area of FZ@GO/ZIF-8 could be due to FZ loading on its surface. The efficiency of FZ@GO/ZIF-8 in the removal of MG reached 99% and furthermore retained good stability after five cycles. The efficiency in removing multiple ions in river water reached more than 80%, which is evidence strongly suggesting that FZ@GO/ZIF-8 is an environmental bionanomaterial with effective application potential.
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International Journal of Nanomedicine
·
2023
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IF 8
Jie Li,Jiangtao Long,Zheng Zhao,Qianqian Wang,Wang Bo,Liang Ren,Yan Fan,Peng Wang,Yi Cheng,Binbin Liu,Xinkui Cheng,Hongwei Xi
Background Multiple stages including hemostasis, inflammation, proliferation, and remodeling were involved in the wound healing process. The increase in nanomaterials in recent years has extended the scope of tools for wound healing; however, it is still difficult to achieve the four multistage procedures simultaneously.Materials and Methods In this study, graphene-spiky silica heterostructured nanoparticles (GS) were synthesized for the procedural acceleration of the multistage in wound healing process. The nanobridge effect of GS was analyzed through the adhesion of two skins, the antibacterial effect was assessed in Gram-negative Escherichia coli (E. coli) and Gram-positive Staphylococcus aureus (S. aureus) bacteria, cell proliferation and migration were investigated in mouse embryonic fibroblast (NIH-3T3) cells, and the in vivo wound healing effect was examined in female BALB/c mice with a cutting wound and E. coli or S. aureus bacteria infection on the back.Results First, GS has a strong nanobridge effect on the rapid closure of wounds because the spiky architecture on the surface of GS facilitates the adhesion of skins, promoting the hemostasis stage. Second, graphene exhibits antimicrobial activities both in chemical and physical interactions, especially under simulated sunlight irradiation. Third, graphene plays an important role in scaffolding function, together with the spiky topographical architecture of GS, accelerating the proliferation and maturation stages.Conclusion By periodically promoting every stage of wound healing, GS combined with simulated sunlight irradiation could significantly accelerate wound healing. With a simple composition and compact structure but multiple functions, this strategy will be the guideline for the development of ideal wound-healing nanomaterials.
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POLYMER COMPOSITES
·
2023
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IF 5.2
Xintong Zhao,Wei Wu,Dietmar Drummer,Yi Wang,Chao Liu,Shuo Li,Zijian Lu
The chemical reduction method is a simple and popular way to contrast the graphene network to improve the polymer matrix's thermal conductivity. And hybrid thermal conductive fillers composed of two or more mixed fillers through chemical synthesis usually have better thermal conductivity because of the synergistic effort. In this work, silicon carbide nanowires (SiC NWs) in graphene aerogels are synthesized with the chemical vapor deposition method, acting as bridges for phonon transmission between adjacent graphene sheets. The RGO/SiC NWs aerogel-endowed EP composites have a high thermal conductivity of 3.79 W/mK at a filler loading of 5.5 wt%, and 4.23 W/mK at a filler loading of 7.5 wt%, which is 1895% and 2126% higher than pure EP resin, respectively. Finite element analysis (FEA) is utilized to analyze the heat conduction mechanism of composites at last.
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Journal of Materials Chemistry A
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2021
·Vol. 9
·期 12
·7791-7806
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IF 12.732
Yunping Wu,Wei Wei,Tianyi Ding,Sheng Chen,Rui Zhai,Caihe Bai
Two-dimensional (2D) heterostructures combine the advantageous features of different 2D materials and represent advanced electrode architectures for the development of efficient energy storage devices. However, common 2D heterostructures made by stacking different 2D sheets in van der Waals (vdW) contact impose obvious limitations in light of the energy storage performance. Here, we shed light on how heterointerface conditions exert a great influence on the electrochemical properties of the heterostructured electrode and provide an example to modulate the interface contact mode via sandwiching unique g-C3N4 mesh (m-g-C3N4). We find that such m-g-C3N4 bonded heterointerfaces can greatly increase the electrochemical activity, redox conversion kinetics and structural integrity of the constituent component (NiS2), manifesting excellent electrochemical performance with respect to vdW heterostructures. Experimental characterization along with theoretical simulations demonstrates that the synergistic effects of the mesh-bonded interfacial contact and plenty of in-between porous channels contribute to superior electrochemical performance. This study directs attention to elaborate interface engineering toward high-performance energy storage and paves the way for designing and manufacturing of advanced heterostructured electrodes for supercapacitors, batteries and other hybrid devices.
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COMPOSITES COMMUNICATIONS
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2021
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IF 6.617
Lu Wu,Yunping Hu,Ping Tang,Hai Wang,Yuezhen Bin
Graphene and its derivatives are considered as one of the most promising functional materials due to their excellent mechanical and electrical properties. Here, we successfully prepared uniform and long-term stable reduced graphene oxide (rGO) dispersion using sodium carboxymethylcellulose (CMCNa) as a stabilizer creatively, and fabricated rGO/CMCNa/polyacrylic acid (PAA) conductive composite hydrogel. The optimal elongation at break of the cylindrical composite hydrogel (1 cm in diameter and 4 cm in length) could reach 1200% at a tensile rate of 50 mm/min. The swelling rate of the composite hydrogel in alkaline environment was much higher than that in acidic environment, indicating excellent pH sensitivity. More importantly, the conductivity of the composite hydrogel could be increased by about 2500% and reached 0.56 S/m due to the construction of the rGO conductive network. The strain sensor based on the rGO/CMCNa/PAA hydrogel showed a wide region of linear response to deformation, up to a strain of 300%. It also exhibited good performance in other aspects, including low hysteresis, a GF value of 1.0, a short response time of 187 ms, and satisfactory stability and repeatability of 2000 cycles at 50% strain. In particularly, the strain sensor could be well adhered to skin without any other adhesives as soft human-motion sensor for real-time and accurate detection of both large-scale and subtle human activities, indicating a great application potential in electronic skin and human health detection.
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Journal of Materials Chemistry A
·
2021
·Vol. 9
·期 11
·7122-7128
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IF 12.732
Yukun Sun,Xupeng Zong,Dan Qu,Ge Chen,Li An,Xiayan Wang,Zaicheng Sun
Solar water evaporation is a sustainable and efficient way to produce fresh water. Identifying highly efficient photothermal materials is an important step for achieving high evaporation rates. However, the effects of the water interfacial area are rarely paid any attention, although a few reports have demonstrated high evaporation rates from micro-/nanostructured devices. In this work, we introduce a new term, water mass per unit surface area (WMUA), to connect the water mass and interfacial area. We can regulate WMUA using different commercial porous materials to realize water management in devices, which further affects the evaporation rates. The optimized device is composed of suedette sponge, filter paper, and polydopamine as the water-transportation, water-restrictive, and photothermal materials, respectively, and it achieves an evaporation rate of 1.8 kg m−2 h−1 and energy efficiency of ∼92%. This presents a new strategy for the rational design of device structures and the promotion of evaporation rates, pushing this field into new areas.
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INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
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2021
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IF 5.816
Wen Ren,Xudong Zhuang,Zhilu Liu,Song Li
Metal-organic frameworks (MOFs) are reported as potential hydrogen storage materials due to ultrahigh surface area and pore volume . However, most top-performing MOFs for hydrogen storage require strict synthesis conditions and high cost, which limits their wide applications. In this work, Cu-BTC/graphene aerogel (GA) composite is prepared at room temperature with improved hydrogen uptake at 100 bar compared with pristine Cu-BTC. To understand the mechanism of the enhanced hydrogen uptakes in the composite, grand canonical Monte Carlo (GCMC) simulation is executed for Cu-BTC/GA composites with different numbers of graphene oxide (GO) layers. It is demonstrated that the increased hydrogen uptake in Cu-BTC/GA composites is mainly ascribed to the hydrogen uptake in the interface region between Cu-BTC and GA. Additionally, the hydrogen uptake of the Cu-BTC/GA composites decreases as the number of GO layers increases, implicating that fewer GO layers or thinner GA is favorable for hydrogen adsorption of Cu-BTC/GA composites.
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JOURNAL OF ALLOYS AND COMPOUNDS
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2021
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IF 5.316
Shang Gao,Yaqing Zhang,Zhimin Yang,Teng Fei,Sen Liu,Tong Zhang
Carbon nanomaterials are considered as potentially promising sensing materials for fabrication of high-performance electrochemical chloramphenicol (CAP) sensors. However, it is highly required to investigate the structure effect of carbon supports on electrochemical sensing performances. Herein, three typical carbon nanomaterials were selected as carbon supports to deposition of trace MoS 2 , including reduced graphene oxide (rGO), multi-walled carbon nanotubes (MWCNTs) and carbon black (CB), which were subsequently used to construct electrochemical CAP sensors. The combined characterizations of Raman spectroscopy , X-ray photoelectron spectroscopy, scanning electron microscopy and transmission electron microscopy indicate that these MoS 2 modified carbon nanomaterials show the morphology and microstructures similar with carbon supports as used. Electrochemical tests indicate that the sensing performances of these CAP sensors are dependent on the structure of carbon supports. Among all these MoS 2 modified carbon nanomaterials, MoS 2 modified rGO hybrids display large electrochemically active surface area and low interfacial resistance between electrolyte and electrode, resulting in the highest sensitivity of 3.581 μA μM −1 cm −2 . As a result, rGO is regarded as good candidate for fabrication of high-performance CAP sensors, compared to MWCNTs and CB. The present work not only clarifies structure effect of carbon supports on electrochemical sensing performances, but also provides help for the construction of high-performance electrochemical sensors and biosensors based on carbon nanomaterials.
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Nanoscale
·
2021
·Vol. 13
·期 16
·7810-7821
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IF 7.79
Dawei Li,Liangji Ma,Bo Zhang,Shaohua Chen
Durability is a crucial feature to expand the application field of artificial superhydrophobic coatings. Herein, a kind of durable superhydrophobic coating is prepared by a simple and cheap method using a fluorine-free suspension as the raw material, which consists of epoxy modified silicone resin (MSR), functionalized SiO2, GO, and lamellar mica powder (MP). The MSR@SiO2 + GO + MP coating shows outstanding surface wettability with a water contact angle of 163.8°, a low sliding angle of 3.5° and the microdroplet adhesive force of about 12.6 ± 0.5 μN. Furthermore, it can withstand alternating high and low temperatures, intense UV radiation for 7 days, strong chemical attack, and various mechanical durability tests. In addition, the coating also exhibits a significantly repairable ability to resist O2 plasma etching, and outstanding self-cleaning both in air and oil even after mechanical damage. The mechanism for the influence of the multiple hybridizations on the long-term corrosion stability and thermal-related properties of the superhydrophobic coating is further systematically studied. The simple method and superhydrophobic coating should have good application prospects in large area protection.
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EUROPEAN POLYMER JOURNAL
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2021
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IF 4.598
Xin-Hua Gao,Jing-Wen Wang,Da-Nian Liu,Xin-Zhu Wang,Hou-Qing Wang,Lei Wei,Hua Ren
A high performance composite based on acrylic resin elastomer (AE) with a low dielectric loss and a high dielectric constant was prepared through introducing hybrid filler of chemically reduced graphene oxide (RGO) decorated with polystyrene cationic microspheres (PS-DMC) (referred to the composite here as PS-RGO/AE). PS-DMC can not only improve the compatibility between the filler and the matrix so that the filler is uniformly dispersed in the matrix to increase the dielectric constant of the composites, but also can be used as an insulating layer to reduce leakage current and reduce the dielectric loss of the composites. The dielectric constant of 2.43 vol% PS-RGO/AE is 194 at 100 Hz, which is 2.40 times that of the 1.55 vol% RGO/AE (81). Moreover, the dielectric loss of 2.43 vol% PS-RGO/AE composite still maintains at a low level (0.29 at 100 Hz), which is lower than that of 1.55 vol% RGO/AE composite (1.16 at 100 Hz). The higher dielectric constant of PS-RGO/AE composites is attributed to enhanced micro capacitors effect and Maxwell-Wagner-Sillars effect through the uniform dispersion of PS-RGO in the AE matrix and the formation of more interfaces.
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JOURNAL OF HAZARDOUS MATERIALS
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2021
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IF 10.588
Jun Shang,Yanni Guo,Deliang He,Wei Qu,Yining Tang,Lei Zhou,Rilong Zhu
A novel graphene oxide-dicationic ionic liquid composite (GO-DIL) was prepared by modifying graphene oxide (GO) with a dicationic ionic liquid (DIL), 3,3′-(butane-1,4-diyl) bis (1-methyl-1H-imidazol-3-ium) chloride ([C 4 (MIM) 2 ]Cl 2 ). GO and GO-DIL were characterized by SEM, BET, FTIR, and XPS, and the materials were used for Cr(VI) adsorption. Batch adsorption studies showed that adsorption reached equilibrium within 40 min, and the optimal pH was 3, where the electrostatic attraction between GO-DIL and Cr(VI) was maximized. The maximum theoretical Cr(VI) adsorption capacity ( q m ) was 271.08 mg g −1 , and q m remained above 228.00 mg g −1 after five cycles. The adsorption data were fitted well by both the pseudo-first-order kinetic model and the Langmuir model. Furthermore, thermodynamics calculations revealed that adsorption was a spontaneous endothermic process. Importantly, electrostatic attraction between Cr(VI) and the protonated imidazole N + of GO-DIL played a critical role in Cr(VI) adsorption, and Cr(VI) was reduced to Cr(III). Thus, GO-DIL is predicted to be an effective adsorbent for Cr(VI) and other heavy metal ions in wastewater.
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ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2021
·Vol. 28
·期 29
·39199-39209
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IF 4.223
Peng Yecan,Ye Guirong,Du Yangliu,Zeng Lingyu,Hao Jiawen,Wang Shuangfei,Zhou Jinghong
This study focused on the feasibility of using Fe 3 O 4 /graphene oxide (FGO) nanocomposites as heterogeneous catalysts for the advanced treatment of real industrial wastewater. FGO nanocomposites with different graphene oxide (GO) ratios were synthesized by coprecipitating iron salts onto GO sheets in basic solution. The characterization of the resulting material structures and functionalities was performed using a range of analytical techniques. A low GO loading afforded a good Fe 3 O 4 nanoparticle dispersibility and resulted in a higher Brunauer–Emmett–Teller surface area and pore volume. The FGO nanocomposites and pure Fe 3 O 4 were used to treat papermaking wastewater in a heterogeneous photo-Fenton process. The results suggested that the nanocomposite designated FGO1 (GO loading of 25 mg) exhibits a higher photocatalytic efficiency than other FGO nanocomposites and pure Fe 3 O 4 . A maximum chemical oxygen demand degradation efficiency of 89.6% was achieved in 80 min with 1.5 g L −1 FGO1 at pH 3. The degradation of different pollutants present in wastewater was evaluated with the aid of gas chromatography–mass spectrometry and 3D excitation–emission-matrix analysis. Inductively coupled plasma atomic emission spectroscopy and magnetic measurements confirmed that the FGO1 nanocomposites possess a low iron leachability and a high reusability. Thus, a comprehensive advanced treatment of real industrial wastewater using a magnetic FGO catalyst is demonstrated.
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