CHEMICAL ENGINEERING JOURNAL
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2020
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IF 10.652
Min Zhang,Feng Deng,Lele Tang,Hui Wu,Yonghao Ni,Lihui Chen,Liulian Huang,Xiaoqing Hu,Shan Lin,Cuicui Ding
Collagen-based hydrogels have been regarded as one of the most popular biomaterials for applications in biomedical engineering as scaffolds, cell or drug carriers and medical implants. Despite numerous studies on collagen-based hydrogels, their applications are still extremely limited due to lack of multi-functionalities. Herein, we present a facile method to prepare a multifunctional, extremely soft collagen-based hydrogel via the introduction of collagen (COL), guar gum (GG), poly(N-isopropylacrylamide) (PNIPAM), graphene oxide (GO) and borax through the formation of both reversible and permanent networks. The resultant hydrogels (COL–GG–PNIPAMs) exhibited desirable properties, including processability, injectability and remoldability. Remarkably, the COL–GG–PNIPAMs stretched manually up to 50 times their initial length before rupturing (from 2 to 100 cm), indicating their super-ductile deformation; when cut, the hydrogels self-healed within a short time period (less than 3 min) without any external stimuli. In addition, the COL–GG–PNIPAMs showed excellent thermal sensitivity and NIR-responsive properties. The potential application of ionic conductive COL–GG–PNIPAMs for strain sensing was also tested by monitoring real-time large-scale movements of the human body or facial micro-expressions. Moreover, the COL–GG–PNIPAMs exhibited a healing ratio of 81.0% for mouse skin wounds, which was higher than that of the blank group (63.6%), demonstrating an enhanced skin wound repair effect. These prominent features of COL-GG-PNIPAMs will broaden versatile collagen-based hydrogels for a variety of applications.
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Nano Research
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2020
·Vol. 13
·期 12
·3292-3298
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IF 8.183
Wei Pengkun,Hao Zewei,Yang Yang,Liu Mingyang,Zhang Haijun,Gao Min-Rui,Yu Shu-Hong
Although nickel-based catalysts display good catalytic capability and excellent corrosion resistance under alkaline electrolytes for water splitting, it is still imperative to enhance their activity for real device applications. Herein, we decorated Ni 0.85 Se hollow nanospheres onto reduced graphene oxide (RGO) through a hydrothermal route, then annealed this composite at different temperatures (400 °C, NiSe 2 -400 and 450 °C, NiSe 2 -450) under argon atmosphere, yielding a kind of NiSe 2 /RGO composite catalysts. Positron annihilation spectra revealed two types of vacancies formed in this composite catalyst. We found that the NiSe 2 -400 catalyst with dual Ni-Se vacancies is able to catalyze the oxygen evolution reaction (OER) efficiently, needing a mere 241 mV overpotential at 10 mA·cm −2 . In addition, this catalyst exhibits outstanding stability. Computational studies show favorable energy barrier on NiSe 2 -400, enabling moderate OH − adsorption and O 2 desorption, which leads to the enhanced energetics for OER.
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JOURNAL OF CHEMICAL AND ENGINEERING DATA
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2020
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IF 2.369
Li Zhang,Fangxiang Song,Shuai Wang,Hongxia Wang,Wei Yang,Yan Li
Graphene oxide (GO)/silica nanosheets (GO/MS@HBP) were synthesized through in situ hydrolysis of tetraethoxysilane (TEOS) on graphene oxide (GO) nanosheets, followed by modification of hyperbranched polymer (HBP) to remove multiple pollutants (Cr(VI) and Congo red (CR)). Characterization methods such as scanning electron microscopy (SEM), transmission electron microscopy (TEM), thermogravimetric-differential scanning calorimetry (TG-DSC), Raman, N2 adsorption/desorption, and X-ray photoelectron spectroscopy (XPS), etc. were adopted. The results of Brunauer–Emmett–Teller (BET) analysis revealed that the prepared GO/MS@HBP has a multistage pore structure with a specific surface area of 345.7176 m2·g–1. The factors of adsorbent dosage, adsorption time, initial solution concentration, pH, etc. that influence adsorption were studied. The maximum adsorption quantities of Cr(VI) and CR at room temperate were 92.2510 and 416.6667 mg·g–1, respectively, and the removal could still be over 90% after three cycles for Cr(VI). Pseudo-second-order kinetic and Langmuir isotherms were more suitable to describe the adsorption process. A possible adsorption mechanism was also proposed. It could be considered as a promising adsorbent because of its good adsorption effect and reproducible property.
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FOOD CHEMISTRY
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2020
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IF 6.306
Shuo Shi,Wentao Zhang,Xinnan Liu,Xinyi Ren,Min Li,Jing Sun,Yutang Wang,Tianli Yue,Jianlong Wang
Lycium barbarum L. polysaccharides (LBPs) with outstanding biological activities are of increasing interest. Traditional purification approaches are time-consuming and often involve toxic solvents that destroy the functionality and structure of polysaccharides. Herein, we report a sustainable and nondestructive strategy for purifying LBPs using graphene-based nano-decoloration. The amination of graphene oxide (GO) enables the resulted aminated reduced GO (NH 2 -rGO) with abundant sp 2 -hybridized carbon domains, displaying high adsorption capacity toward pigments in crude polysaccharides. As such, within 5 min, NH 2 -rGO can highly effectively and fast to decolor LBPs, with a high decoloration ratio of 98.72% and a high polysaccharides retention ratio of 95.62%. Importantly, compared with traditional decoloration methods, NH 2 -rGO is nondestructive toward LBPs and has good reusability. Moreover, it exhibited widespread-use decoloration performance to decolor several common plant species. Overall, our proposed nano-decoloration approach is a general-purpose, sustainable, and nondestructive method to purify LBPs.
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PubMed
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ZEITSCHRIFT FUR ANORGANISCHE UND ALLGEMEINE CHEMIE
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2020
·Vol. 646
·期 19
·1655-1659
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IF 1.24
Luyu Wang,Jinguli Wen,Yuhang Wu,Junkuo Gao
Designing a humidity sensor with high performance to quick and accurate detect relative humidity (RH) is important in various applications. Consideration must be given to both the high response and the quick reversibility. Here, based on Quartz Crystal Microbalance (QCM) sensing platform, we utilized commercial graphene oxide as a sensing material, and added commercial carbon nanocoil to block the stacking of graphene oxide layers. The fabricated novel sensor possessed super high response (4618 Hz/97 % RH) and quick reversibility (2 s). This work not only expands the application of commercial carbon materials, but also achieves the development of high-performance humidity sensor with commercial potential.
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Journal of Cleaner Production
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2020
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IF 7.246
Ruijun Qiu,Zhe Huang,Jianyi Zheng,Qingbin Song,Jujun Ruan,Yetao Tang,Rongliang Qiu
Improper treatment of spent lithium ion batteries will cause great damages to environment. Vacuum reduction was advised as a green recovery technology of nickel and cobalt from spent lithium ion batteries. However, the separation of magnetic particles from the vacuum-reduced products of spent lithium-ion batteries has not been studied. After reduction, the particle size was so small that the formation of agglomerates would affect the separation efficiency which was a common problem in fine magnetic particle sorting. In this paper, a fluid-magnetic separation method was developed for micro-separation of cobalt from the vacuum reduction product of electrode materials of spent lithium ion batteries. This method had a high level of clean production and sustainable development at the same time as high separation rate. An energy model was established to analyze the mechanism of breaking agglomerates, and the experimental parameters affecting recovery efficiency were studied according to the energy model. In simulation experiments, under the optimal parameter conditions of 35 °C, solid-liquid ratio of 500 mL/g and collection mat material of plastic, the recovery rate and purity of cobalt micro-particles were both above 99%. After applying the vacuum reduction product to fluid-magnetic separation, the recovery rate of magnetic fine particles was 98.26%, which fully verified the effectiveness. Further, it provides a new idea for separating micro magnetic particles from micro-sized mixed particles and promoted the process of recycling spent lithium ion batteries.
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MATERIALS CHEMISTRY AND PHYSICS
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2020
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IF 3.408
Hafezeh Nabipour,Xin Wang,Lei Song,Yuan Hu
A coating comprising graphene oxide (GO) and oleic acid (OA)-modified zeolitic imidazolate frameworks-8 (ZIF-8) was deposited to cotton fabrics with the aim of obtaining a flame-retardant, self-cleaning and superhydrophobic features. SEM images showed a rough surface with hierarchical structure for GO-cotton/ZIF-8. Existence of the coating on the surface of cotton fabrics was proved by XPS spectra and FT-IR characterization. Surface of the GO-cotton/ZIF-8 fabrics achieved a remarkable degree of thermal and mechanical stability and superhydrophobicity. The results from a flame test demonstrated a protective effect of the coating on the cotton fabrics against fire. Additionally, the GO-cotton/ZIF-8 cotton showed superior self-cleaning ability and oil/water separation performance due to its superhydrophobic surface. Thus, it has a wide range of potential applications in military equipment and outdoor clothing.
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CORROSION SCIENCE
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2020
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IF 6.479
Yufei Tang,Lixia Zhu,Ping Zhang,Kang Zhao,Zixiang Wu
The surface of a medical magnesium alloy treated by micro-arc oxidation was coated with magnesium phosphate-based bio-piezoelectric bone cement. The high tensile adhesive strength of the obtained composite coating was 6.83 MPa due to mechanical locking and its chemical reaction. The corrosion degradation property of the bio-piezoelectric composite coating in simulated body fluid improved because the negative surface charge after polarization led to the balance between degradation and deposition rates during apatite deposition. After the coating was soaked in simulated body fluid (SBF) for 7days, the weight loss rate of the sample considerably decreased to 1.03%, and the average corrosion rate decreased to 3.33 mm/year.
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ACS Omega
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2020
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IF 2.87
Yu-hang Song,Qing-tao Xu,Tao He,Zi-yang Wang,Lei Yu
An anthraquinone-2-sulfonate and reduced graphene oxide nanocomposite (AQS@rGO) was prepared and the improvement on the biotic reduction of a pollutant, i.e., azo dye, was demonstrated. Electron paramagnetic resonance signal of the semi-quinone radical in the well-dispersed solid AQS@rGO solution was detected. Although the as-prepared AQS@rGO has a negligible adsorption capacity toward methyl orange (MO) dye, the decolorization efficiencies in both flask experiments and sequencing operation reactors in the presence of AQS@rGO were increased by more than 1.5 times as compared to that with graphene oxide, and an efficient and continuable catalytic effect on the decolorization of azo dyes in seven operation periods was maintained. The catalytic effect on reduction was caused by the formation of a space-charge layer, which facilitates the efficient e– transfer from the conductive rGO sheets to the C═O of the AQS molecule. The results suggested that the AQS@rGO may act as an efficient insoluble redox mediator, which is important for the pollution control by accelerating the extracellular electron transfer.
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PubMed
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JOURNAL OF THE ELECTROCHEMICAL SOCIETY
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2020
·Vol. 167
·期 12
·127501
·
IF 3.721
Luo Wei,Ji-Hui Li,Chao Chen,Qian Lv,Ruitao Lv,Liqiang Ma,Wanci Shen,Feiyu Kang,Zheng-Hong Huang
The preparation of substrate with high specific surface area and conductivity is very important in the development of non-enzymatic glucose sensors. This study presents a non-enzymatic glucose sensor electrode based on a hybrid reduced graphene oxide (rGO) and carbonized silk fabric (CSF) substrate obtained by immersing silk fabric in a graphene oxide solution and carbonizing at 950 °C in an Ar atmosphere, and then decorating the rGO/CSF surface with Cu nanoflowers by electrodeposition. The optimum Cu-rGO/CSF sensor electrode exhibits high glucose sensitivities of 6613.3 μA mM−1 cm−2 and 1541.7 μA mM−1 cm−2 with linear responses over separate glucose concentration ranges of 0.05–4.0 mM and 4.0–7.0 mM due to the rGO/CSF substrate has high specific surface area, good conductivity and the Cu nanoflowers have high catalytic activity. The electrode also provides a lower limit of detection of 2.27 μM at a signal-to-noise ratio of 3 and high stability in the air. These results demonstrate that the proposed electrode material facilitates the development of simple and accurate non-enzymatic glucose sensors.
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SYNTHETIC METALS
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2020
·
IF 3.286
Ke Qu,Yuqi Bai,Bo Chen,Miao Deng
Researchers have been focusing on the electrochemical energy storage system to tackle with the current energy crisis problem. With the increased demand of wearable electronics, all-solid-state flexible supercapacitors are becoming promising energy storage device. In this study, a simple and facile method was practiced to prepare hybrid composites by integrating molybdenum disulfide (MoS 2 ) and graphene oxide (GO) as dual dopants to co-dope conducting polymer polyaniline (PANI), affording the PANI/MoS 2 /GO composite via in situ chemical oxidative polymerization. The as-prepared PANI/MoS 2 /GO composite was characterized by various spectroscopic methods, ranging from X-ray powder diffraction, infrared spectroscopy to scanning electron microscopy. The supercapacitive properties of the prepared dual dopant-doped composite as electrode materials have been evaluated electrochemically and yielded specific capacitance of 130.4 F/g under 1.0 A/g current density. Excellent rate performance was observed for the PANI/MoS 2 /GO composite, giving specific capacitance of 96.7 F/g with 10.0 A/g current density applied. The composite remained to give an excellent capacitance retention of 98.5 % after 500 galvanostatic charge-discharge cycles, which demonstrated the unique stabilizing effects of MoS 2 and GO dual dopants toward PANI’s energy storage behavior in terms of supercapactive performances. The findings in this study will contribute significantly to the progress of conducting polymer-based energy storage materials.
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JOURNAL OF ELECTROANALYTICAL CHEMISTRY
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2020
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IF 3.807
Huilian Hao,Jianjun Wang,Qiu Lv,Yiding Jiao,Jing Li,Wenyao Li,Isil Akpinar,Wenzhong Shen,Guanjie He
To solve the problems related to the re-stacking of reduced graphene oxides (rGO) and further improve their surface chemical behaviors to satisfy supercapacitor demands. The rGO decorated with graphene quantum dots has been successfully prepared via a facile low-power ultrasonic method. It is demonstrated the graphene quantum dots/reduced graphene oxide electrode has a high specific capacitance of 312 F g −1 , which is nearly three times higher than that of the reduced graphene oxide (132 F g −1 ). The enhanced super-capacitive performances of graphene quantum dots/reduced graphene oxide have been attributed to the introduction of graphene quantum dots, which effectively prevent the aggregation and restacking of reduced graphene oxide sheets, promoting its surface exposed to the electrolyte for sufficient mass transfer. Meanwhile, these features provide more pathways for the transportation of electrons between the interlayer of reduced graphene oxide sheets. Afterward, a detailed energy storage mechanism was analyzed.
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