RENEWABLE ENERGY
·
2020
·
IF 6.274
Ting Zhang,Tuodi Zhang,Jing Zhang,Deyi Zhang,Pengran Guo,Hongxia Li,Chunlei Li,Yi Wang
The large-scale commercial application of phase change materials (PCMs) was seriously limited by the leakage, poor heat storage capacity and slow thermal response behavior. To address these issues, stearic acid/graphene oxide-attapulgite aerogel (SA/HGA-ATP) shape-stabilized PCMs were fabricated via hydrothermal method . The morphology, structural characteristics, thermal properties were determined and the effects of ATP percentage on the thermal properties of confined SA were studied synchronously. The nanofibers of ATP intercalated among GO sheets via grafting modification and formed fiber-bridging 3D-network. Due to the enhanced loading interspaces and suppressed volumetric shrinkage of hybrid matrix, SA/HGA-ATP exhibited excellent thermal energy storage capacity (190.9 J g −1 ) and ultra-high SA contents (approx. 98 wt%) without leakage. The intercalated nanofibers sheltered the oxygen-containing groups of matrices, leading to the promotion of thermal energy storage performance with increase of ATP contents. Besides, the as-prepared PCMs displayed outstanding thermal response behavior because the interconnected and fiber-bridged matrices provided continuous thermal transfer pathway. Due to the protection of matrix, the composite PCMs also exhibited superior structure stability and incomparable thermal energy storage/release reliability. Considering the outstanding thermal-physical properties and low-cost of ATP, the SA/HGA-ATP has the potential to be applied in the fields of thermal energy storage, conversion and utilization.
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DOI
高影响因子
TALANTA
·
2020
·
IF 5.339
Yiyuan Zhou,Jiabi Xu,Nan Lu,Xinyu Wu,Yu Zhang,Xiaohong Hou
MIL-101(Cr) and graphene aerogel (GA) were hybridized as a multifunctional adsorbent for the preconcentration of trace analytes. The novel MIL-101(Cr)@GA was prepared and characterized by FTIR, XRD and SEM, where GA is serving as a carrier for MIL-101(Cr). The synthesized composite as a solid phase extraction (SPE) sorbent combined with UPLC-MS/MS was applied for the determination and quantification of five NSAIDs (phenacetin, meloxicam , naproxen , diclofenac sodium and carprofen) in different environmental water samples. The parameters influencing the whole extraction process were systematically optimized. Under the most favorable. conditions, good sensitivity was achieved with a limit of detection between 0.006 and 0.012 ng mL −1 , the linear range of 0.02–2 ng mL −1 for phenacetin , meloxicam and 0.05–5 ng mL −1 for naproxen , diclofenac sodium , carprofen ( r 2 ≥ 0.9940). The satisfactory recoveries of the target analytes were in the range from 77.2 to 103.3% with relative standard deviation (RSD) from 0.6% to 8.4%. The established method was proved to be simple, highly sensitive and accurate. The adsorbent could be reusable up to nine cycles without any decrease in performance, which provides economic strategy and little waste generation. Adsorption behaviors were explored by choosing two typical types of NSAIDs as models to measure the adsorption capacity of MIL-101(Cr)@GA. The maximum adsorption capacities for PHE and NAP were 232.5 and 333.3 mg g −1 , respectively.
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DOI
PubMed
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2020
·Vol. 138
·期 11
·50038
·
IF 2.52
Linjiong Zhang,Lianfang Feng,Xueping Gu,Cailiang Zhang
Oil spills and organic chemical leakage have caused serious environmental problems, calling for highly effective adsorbents at low cost. Superelastic and hydrophobic-oleophilic modified melamine foams with ultralow amounts of well-dispersed graphene were prepared via dip-coating. The composite foams showed high selectivity for adsorbing various organic chemicals from water and could be regenerated easily. Moreover, excellent adsorption capacity ranging from 80 to 170 times its own weight was found depending on the density of organic chemicals. These coated foams show great potential for continuous oil/water separation and oil fume removal.
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高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2020
·
IF 10.652
Jing Wu,Mei Lin,Xiulan Weng,Gary Owens,Zuliang Chen
Emerging contaminants such as Mitoxantrone (MTX) are a major environmental concern because they have potential genotoxicity and mutagenesis to both aquatic organisms and humans. In this study, a pre-adsorption/Fenton-like oxidation system was developed which used a reduced graphene oxide/iron nanoparticles hybrid (rGO/Fe NPs) as both the adsorbent and the Fenton catalyst to remove MTX from solution. While the addition of H 2 O 2 alone removed only 11.3% of MTX, the rGO/Fe NPs/H 2 O 2 system was significantly more efficient removing 99.8% of MTX in the same period. This indicated that rGO/Fe NPs had excellent catalytic activity even at pH 7. This efficient removal was attributed to significant production of ·OH mainly by heterogeneous catalysis but supplemented by a homogeneous Fenton reaction, where ·OH had a higher affinity for MTX than SO 4 − ·. The sequential Fenton-like oxidation process best fits a pseudo-second-order kinetic model (R 2 ≥ 0.974). Characterizations of rGO/Fe NPs before and after the reaction, together with the identification of specific MTX degradation products , allowed possible degradation pathways to be proposed together with insights into the underlying mechanisms of MTX degradation when using rGO/Fe NPs in a pre-adsorption/Fenton-like oxidation system. Finally, the rGO/Fe NPs developed was successfully applied for the removal of MTX from spiked wastewater with 93.6% removal efficiency, which indicated that the proposed system had significant potential for wastewater treatment applications.
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高影响因子
MICROCHEMICAL JOURNAL
·
2020
·
IF 3.594
Yan-mei Shi,Xi Zhang,Lin Mei,De-en Han,Kai Hu,Li-Qin Chao,Xiu-min Li,Ming-san Miao
A new amplified signal strategy for acetaminophen (AC) electrochemical sensor was explored by soluble zinc tetrahydroxyphthalocyanine-reduced graphene oxide nanocomposite as an improved electrode material via non-covalent functionalization. The electrochemical signal of AC was amplified by the remarkably increased electroactive surface area of the nanocomposite-modified glassy carbon electrode. Moreover, the synergistic enrichment effect can be achieved by the adsorption of π-π stacking and hydrogen bonding of hydroxyl groups. The prominent electrocatalytic effect toward AC oxidation were examined systematically on the proposed sensor and a sensitive and selective electroanalytical method for AC was developed. Under optimized conditions, the electrochemical response of the sensor exhibited a linear dependence on the concentration of AC ranging from 0.03 to 100 μM and 100 to 800 μM with a detection limit of 10 nM (S/N = 3). The proposed sensor with excellent selectivity, reproducibility and long-term stability for AC sensing was successfully applied for AC determination in drug formulation and human urine samples.
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高影响因子
CORROSION SCIENCE
·
2020
·
IF 6.479
Dan Xue,Qing Bo Meng,Ying Xi Lu,Lin Liang,Yu Han Wei,Xian Bin Liu
Herein, polyurethane (PU)/poly(propylene oxide) grafted graphene oxide (GO-g-PPO) composite coating with anticorrosive properties was prepared by in situ polymerization. Results revealed that the anticorrosive properties of PU/GO-g-PPO-16 composite coating were greatly improved by the homogenous dispersion of GO-g-PPO-16 composites in PU coating. When the solid content of GO-g-PPO-16 composites was 0.08 wt. % in PU coating, the coating resistance was 50 times higher than that of PU coating after immersion in 3.5 wt. % NaCl (aq.) for 168 h.
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高影响因子
Nanoscale
·
2020
·Vol. 12
·期 41
·21325-21333
·
IF 6.895
Xing Chen,Jianjun Jiang,Guoyu Yang,Chuanbing Li,Yujun Li
MXenes, a new class of two-dimensional materials with excellent performance, are promising materials for wearable energy storage devices. However, the lack of sufficient interaction between various MXene particles makes it difficult to translate the exceptional performance from the nanoscale to macroscale. Additionally, the intrinsic characteristic of easy oxidation limits their practical applications. Herein, inspired by the structure of wood, a biomimetic core–shell MXene@graphene oxide (MX@GO) fiber was fabricated using GO as a mechanical layer to wrap MXenes. The GO layer could easily assemble MXene particles into macroscale materials and protect them from oxidation. Therefore, the as-fabricated core–shell MX@GO fiber showed a high tensile strength (290 MPa) and excellent electrical conductivity (2400 S m−1). Notably, the conductivity of the biomimetic fiber only decreased to 1800 S m−1 with a reduction of about 30% at 100 °C. This work paves the way to fabricate MXene-based fibers with freely designed functionalities and morphologies, which are suitable for various high-value fabric-based applications.
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DOI
PubMed
高影响因子
APPLIED SURFACE SCIENCE
·
2020
·
IF 6.182
Yanming Yang,Ming Liu,Shitong Han,Hailing Xi,Chao Xu,Rusheng Yuan,Jinling Long,Zhaohui Li
TiO 2 spherical shells with both inner and outer surface modified by graphene have been successfully constructed through a stepwise loading method. This double-sided modification method greatly increases the contact area of the shell with graphene sheets, which is beneficial for graphene to separate more photoelectrons from both the inner and outer sides of the shell simultaneously. The results of photocatalytic reduction of CO 2 into CO indicate that the modification effects of inner and outer wall of TiO 2 shell by graphene seem to be relatively independent to each other. As a result, compared with the traditional single-sided modified samples, even these optimal ones, the loading of graphene on the other side of TiO 2 shell can still improve the photocatalytic reduction performance. Moreover, the optimal dosage of graphene on one side of shell surface is always maintained, without being affected by the graphene usage on the other side. This work indicates that the unique heterojunction obtained by graphene double-sided modification is advantageous to enhance the photocatalytic CO 2 reduction performance and expected to be extended to the construction of other photocatalysts.
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高影响因子
Materials Express
·
2020
·Vol. 10
·期 10
·1725-1731
·
IF 1.65
Duan Xiaobo,Ding Yanhong,Yu Meng
Multilayer graphene was prepared in this study by microwave burst method. Cu9S5/CoS/graphene and CuS/CoS2/graphene composites were obtained by hydrothermal method to regulate the molecular structure and combination of Cu and Co metal sulfides on graphene
substrate. Graphite oxide was doped by hydrothermal method, and then Cu9S5/CoS/graphene composite was prepared by microwave explosion method. Raman, SEM and TEM were used to characterize the self-made graphene. Results showed that the multilayer graphene had a bag-like
structure which was beneficial to anchor sulfide. Three graphene-based composites were characterized by scanning electron microscopy, X-ray diffraction, energy spectrum analysis and electrochemical properties. Moreover, results showed that CuS/CoS2/graphene had the best electrochemical
performance, and its specific capacity reached 324 F/g when the current density was 1 A · g–1, which was much higher than that of the other two samples. Capacity retention rate, interfacial charge transfer resistance and electrolyte diffusion resistance also have advantages.
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高影响因子
Journal of Materials Chemistry A
·
2021
·Vol. 9
·期 11
·7122-7128
·
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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高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2021
·
IF 4.539
Hongyu Cen,Zhenyu Chen
Functionalized graphene oxide (FGO) were synthesized and investigated as corrosion inhibitors of carbon steel in this research. The inhibition behavior of FGO in CO 2 -saturated NaCl solution was studied via weight loss, surface characterizations, and electrochemical measurements. Results confirm that FGO could protect metal effectively and the inhibition efficiency showed the extreme effect as the increase of FGO concentration, reaching a maximum of 83.4% at 20 mg/L. FGO can adsorb on carbon steel via the functionalized groups and form the hydrophobic cover layer on the metal surface by the lamellar nanoparticles.
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高影响因子
APPLIED COMPOSITE MATERIALS
·
2021
·Vol. 28
·期 1
·219-233
·
IF 2.181
Wang Pei,Deng Guanyu,Zhu Hongtao,Yin Jian,Xiong Xiang,Zhang Hongbo
To improve electrical conductivity of the carbon-based pantograph strip, a sliding contact material of pyrolytic carbon (PyC) coated-copper foam/carbon composite was fabricated by chemical vapor deposition technology, followed by densifying processes of furan resin impregnation and carbonization. Morphology, electrical conductivity, wear and friction behavior of the composites are investigated to clarify the effect of PyC thickness (from 0 μm to 280 μm) on tribological behaviors and current transfer characteristic. The results show that there is a good interface combination between copper foam and resin carbon matrix in the composites after the improvement of interface wettability by inserting PyC layer. The composite has great advantages in electrical conductivity and density due to the copper foam and PyC layer with three-dimensional structure. With increasing the PyC thickness, both electrical conductivity and wear resistance of the composite have steadily increasing tendency, but friction coefficient has no obvious change. In addition, an analytical model is developed to explore current transfer mechanisms of the PyC-copper foam/carbon composite, and the theoretical predictions are in agreement with the experimental observations, in term of electrical conductivity and porosity of composite preform.
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高影响因子
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