ACS Omega
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2022
·
IF 4.132
Chenguang Yang,Jianqiang Yin,Liqin Wu,Qiuyu Zeng,Liwei Zhang
For coal and gangue, intelligent sorting processes for separation, the use of coal and gangue mineral components with different fundamental differences, and the study of different properties of minerals and coal with different scales and density regarding the gray value change law are presented. The results show that the gray value of single minerals and mixed minerals gradually decreases with the increase of their thickness and density. The greater the density of minerals, the smaller the gray value at the same thickness, and the same rule applies to different coal ranks. Via regression analysis methods, the values of the regression equation parameter a of pure minerals for graphite, quartz, kaolinite, and montmorillonite are 59.25, 65.69, 61.61, and 58.02 in the high-energy region, respectively. In the low-energy region, they are 174.95, 177.31, 186.95, and 161.81. For the regression equation parameter of mixed minerals in the form of two mixed minerals (graphite and quartz, kaolinite, or montmorillonite) and three kinds of mineral mixing (graphite–kaolinite and quartz; graphite–montmorillonite and quartz; graphite–kaolinite and montmorillonite), the gray values are 151.12, 156.00, 153.13,152.43, 152.98, and 151.98 in the high-energy region, respectively; in the low-energy region, they are 193.34, 201.34, 192.93, 191.26, 194.68, and 193.08. The phenomenon for the gray range of two kinds of single minerals locates in the range of mixed minerals that was formed from a single mineral observed after the regression equation of mixed mineral was verified by a single mineral, which agrees with the X-ray recognition pattern. In the end, as the density of coking coal, fat coal, and gas coal increases, the gray value decreases, which was in agreement with single- and mixed-mineral analyses.
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高影响因子
Separations
·
2022
·Vol. 9
·期 12
·391
·
IF 3.344
Zhiquan Yang,Chong He,Wenning Liao,Xinyi Zhang,Wanhui Liu,Baosheng Zou
Dye effluent damaged the water environment and human health with its massive discharge. In order to eliminate dye from the water environment, a variety of adsorbents were used to investigate dye removal. Graphene oxide (GO) attracted extensive attention due to its excellent surface property in the degradation of dye wastewater. Modified GO with multifunctional groups helped to improve adsorption performance. 3-Aminopropyltriethoxysilane modified GO (AS-GO) was fabricated for the removal of Orange G (OG) in this study. The results showed that AS-GO had an excellent adsorption ability of OG. During the reaction process, the maximum adsorptive capacity of OG was up to 576.6 mg/g at T = 313 K and pH = 3 with the initial OG concentration of 100 mg/L and the initial adsorbent dose of 2.5 g/L. The adsorption kinetic process of AS-GO conformed to the pseudo-second-order and Langmuir models. The spontaneous and endothermic adsorption of OG occurred in the adsorption process. The main adsorption mechanisms were electrostatic, π–π and hydrogen bonding interactions in the reaction process. After four cycles of AS-GO, it maintained high removal efficiency owing to its remarkable stability. The scheme of GO modified with AS could hinder the agglomeration of GO and provide more active sites, which would further enhance the adsorption properties and expand its application in water purification.Keywords:adsorption;Orange G;graphene oxide;3-aminopropyltriethoxysilane
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Chemistry-An Asian Journal
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2022
·Vol. 18
·期 3
·e202201130
·
IF 4.839
Yuhang Han,Yingyi Ma,Junming Zhang,Shun Yao,Kaizheng Xu
Graphical Enhancing the low-dielectric, water resistance and mechanical properties of PI film through integrating GO and a sandwich-type porous structure was achieved. Simultaneous improvement in dielectric, water resistance and mechanical properties of polyimide (PI) films is critical for their practical use, but difficult to achieve. Herein, a sandwich-type porous GO/PI film with excellent comprehensive properties was obtained through integrating a GO-containing complex, fluorine-containing porous structure and sandwich-type distribution of porous structure by a simple, low-cost and green breath figure method. With the addition of only a small amount of GO-containing complex, a low dielectric constant of 2.21, water absorption of 0.51%, increment in dielectric constant after moisture treatment of 1.60% and high tensile strength of 113.1 MPa, tensile modulus of 1.70 GPa, with 35.39%, 79.42%, 81.81% of reduction and 17.22%, 21.43% of increase compared to PI film were shown, respectively. Moreover, these properties could be adjusted through regulating the component and porous structure by changing the parameters of breath figure method. These outstanding properties make the film a promising candidate for high-performance low-dielectric materials.
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Nanoscale
·
2022
·Vol. 15
·期 3
·1260-1272
·
IF 8.307
Jianxin Xu,Yang Li,Junyao Wang,Huan Liu,Qi Hou,Rui Wang,Tianhong Lang,Bowen Cui,Hongxu Pan,Yansong Chen,Jingran Quan,Hanbo Yang,Lixiang Li,Yahao Liu
Flexible power sources are crucial to developing flexible electronic systems; nonetheless, the current poor stretchability and stability of flexible power sources hinder their application in such devices. Accordingly, the stretchability and fatigue stability of flexible power sources are crucial for the practical application of flexible electronic systems. In this work, a flexible electrode with an arc-shaped star concave negative Poisson's ratio (NPR) structure is fabricated through the screen printing process. Using the combination of finite element analysis (FEA) and tensile tests, it is proven that the arc-shaped star concave NPR electrode can effectively reduce the maximum tensile stress and increase the maximum elongation (maximum elongation 140%). Furthermore, the flexible electrodes prepared in this study are assembled into all-solid-state symmetric supercapacitors (SSCs), and their electrochemical properties are tested. The SSC prepared in this study has a high areal capacitance of 243.1 mF cm−2. It retains 89.25% of its initial capacity after 5000 times of folding and can maintain a stable output even in extreme deformation, which indicates that the SSC prepared in this study has excellent stability. The SSC with the advantages mentioned above obtained in this study is expected to provide new opportunities to develop flexible electronic systems.
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SEPARATION AND PURIFICATION TECHNOLOGY
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2022
·
IF 9.136
Pengxin Zeng,Chuanwen Zhao,Chenxi Liang,Peiyu Li,Haoxuan Zhang,Ruilin Wang,Yafei Guo,Hongqiang Xia,Jian Sun
K 2 CO 3 -based adsorbent pellets produced by graphite-casting method are promising alkali metal-based solid CO 2 adsorbents. The incorporation of porous metal oxide supports is an effective to enhance CO 2 adsorption capacity of K 2 CO 3 -based adsorbent pellets. In this work, graphite-casted K 2 CO 3 -based adsorbent pellets incorporated with different porous supports (i.e., TiO 2 , ZrO 2 , and SiO 2 ) were prepared for CO 2 capture. Comparatively, the ZrO 2 -supported, K 2 CO 3 pellets loaded with 30 wt% of K 2 CO 3 exhibit the highest CO 2 adsorption capacity, approximately 0.93 mmol/g. For the SiO 2 -supported K 2 CO 3 adsorbent pellets, the high calcination temperature (>700 °C) required to remove the graphite layer covering the pellet surface will cause the formation of new eutectics (i.e., K 2 Si 2 O 5 and K 2 Si 4 O 9 ), which leads to the collapse of the adsorbent pellets. Low calcination temperature of 500 °C can avoid the collapse of the SiO 2 -supported K 2 CO 3 adsorbent pellets and remove most of the graphite on the surface. Moreover, the CO 2 adsorption capacity can be further increased to 1.30 mmol/g by adding 20 wt% of microcrystalline cellulose to the SiO 2 -supported K 2 CO 3 adsorbent pellet. Although the adsorption capacity of structurally improved, SiO 2 -supported K 2 CO 3 pellets is still inferior to that of structurally improved, ZrO 2 -supported K 2 CO 3 pellets, they exhibit great cost advantage. Therefore, SiO 2 -supported K 2 CO 3 pellets with 20 wt% of microcrystalline cellulose have industrial application prospects.
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Materials Today Communications
·
2022
·
IF 3.662
Feng Ouyang,Xiaoli Zhang,Tao Wang,Qi Shuai
The accurate determination of glucose in the human body is highly desired because excessive ingestion of glucose may lead to obesity, diabetes and other diseases. This work demonstrates a fluorescent probe for sugar detection using the unique affinity of boronates for cis -diols. The fluorescent sensing system is composed of two components: 1) Aminated graphene oxide (GON) decorated with phenylboronic acid (BPA) and 1,1′-ferrocenedicarboxylic acid (FCA) as a fluorescence quencher (FCA–GON–BPA); and 2) fluorophores of a cis -diol modified tetraphenylethylene derivative (TPBD) with aggregation-induced emission (AIE) characteristics as the luminescence. FCA–GON–BPA can selectively bind cis -diol-containing fluorogens, such as TPBD, resulting in fluorescence quenching of the probe system. Upon addition of glucose, a new cyclic boronate ester is formed, resulting in the cis -diol-containing fluorogen dissociating from the quenched system, and TPBD fluorescence is recovered. The probe has an obvious response to the presence of glucose and a low limit of detection (LOD, 4.36 mg/mL).
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高影响因子
Frontiers in Bioengineering and Biotechnology
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2022
·
IF 6.064
Li Jianfeng,Liu Xiao,Crook Jeremy M.,Wallace Gordon G.
Tissue engineered constructs can serve as in vitro models for research and replacement of diseased or damaged tissue. As an emerging technology, 3D bioprinting enables tissue engineering through the ability to arrange biomaterials and cells in pre-ordered structures. Hydrogels, such as alginate (Alg), can be formulated as inks for 3D bioprinting. However, Alg has limited cell affinity and lacks the functional groups needed to promote cell growth. In contrast, graphene oxide (GO) can support numerous cell types and has been purported for use in regeneration of bone, neural and cardiac tissues. Here, GO was incorporated with 2% (w/w) Alg and 3% (w/w) gelatin (Gel) to improve 3D printability for extrusion-based 3D bioprinting at room temperature (RT; 25°C) and provide a 3D cellular support platform. GO was more uniformly distributed in the ink with our developed method over a wide concentration range (0.05%–0.5%, w/w) compared to previously reported GO containing bioink. Cell support was confirmed using adipose tissue derived stem cells (ADSCs) either seeded onto 3D printed GO scaffolds or encapsulated within the GO containing ink before direct 3D printing. Added GO was shown to improve cell-affinity of bioinert biomaterials by providing more bioactive moieties on the scaffold surface. 3D cell-laden or cell-seeded constructs showed improved cell viability compared to pristine (without GO) bio-ink-based scaffolds. Our findings support the application of GO for novel bio-ink formulation, with the potential to incorporate other natural and synthetic materials such as chitosan and cellulose for advanced in situ biosensing, drug-loading and release, and with the potential for electrical stimulation of cells to further augment cell function.
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CHEMICAL ENGINEERING SCIENCE
·
2022
·
IF 4.889
Wan-Jing Yu,Zhiyuan Liu,Qiongyu Dai,Maria A. Tsiamtsouri,Tianhui An,Hui Tong
Niobium-oxide based materials are well-known in electrochemical energy area because of their unique structural advantage, which can realize fast ion insertion/extraction and interfacial pseudo-capacitance effects. However, instinct poor electrical conductivity and terrible volume change of Nb 2 O 5 under lithiation/delithiation have hindered its practical application. Here, a three-dimensional (3D) graphene network has been constructed by a simple hydrothermal reaction and utilized to buffer the severe structural variation of Nb 2 O 5 . Meanwhile, silver nanoparticles have been incorporated into this 3D structure through silver-mirror reaction, by which the charge-transfer ability of the composite (Ag-Nb 2 O 5 @rGO) can be significantly improved. The obtained Ag-Nb 2 O 5 @rGO can contribute a charge capacity of ∼ 208.0 mAh/g at 0.5C and ∼ 106.6 mAh/g up to 20C. Meanwhile, superior cyclic performance with ∼ 80 % capacity retention after 500 cycles at 2.5C can be achieved. This demonstrates that the Ag-Nb 2 O 5 @rGO composite can work as a high-performance anode for electrochemical energy devices.
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JOURNAL OF MEMBRANE SCIENCE
·
2022
·
IF 10.53
Rui Wang,Jiayi Wu,Jingxian Zheng,Baoliang Chen,Xiaoying Zhu
Conventional homogeneously charged nanofiltration (NF) membranes showed limited capabilities in ion transmembrane behavior control, which hindered the ion separation performances. In this study, novel Janus membranes were developed to manipulate the penetration of monovalent and divalent ions in NF. Graphene oxide nanosheets with enhanced positive charge (PGO) and negative charge (NGO) were successfully synthesized and assembled in designed orders and proportions to construct the Janus membranes with desired upper and lower surface charges. The positively charged upper surface and the negatively charged lower surface of the PN Janus membrane showed high retention of divalent cations but high permeation of monovalent cations; when the mass ratio of PGO to NGO was 1–5, the PN-1/5 membrane indicated a significant Li + /Mg 2+ separation factor at 23.5. On the other hand, the NP-4/2 Janus membrane composed of negatively charged upper layer and positively charged lower layer indicated the most promising indiscriminate divalent ion removal efficiency (>80%) as compared with the literature. The molecular dynamics simulation theoretically proved the ion penetration behavior manipulation by the Janus membranes were feasible. This study proposed a facile strategy to dramatically improve the performances of NF in Mg 2+ /Li + separation and indiscriminate divalent ion removal.
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Nano Research
·
2022
·Vol. 16
·期 4
·5033-5041
·
IF 10.269
Wang Zhi-Guo,Shen Hui-Yuan,Yu Ruo-Lin,Gao Jie-Feng,Zhang Guo-Qiang,Xu Chun,Lei Jun,Du Ji-Guang,Xu Jia-Zhuang,Li Zhong-Ming
Two-dimensional (2D) nanomaterials have aroused immense attention in extensive applications due to their intriguing physical and chemical properties. However, there is a formidable challenge to prepare few-layered and functionalized 2D nanomaterials in an effective and universal way. Herein, we developed an integrated strategy of glucose-assisted mechanochemical exfoliation and cosolvent-intensified sonication exfoliation to effectively exfoliate and functionalize 2D materials. Taking exfoliation of boron nitride (BN) as an example, the production yield and functionalization ratio of BN nanosheets (BNNSs) reached 47.5% and 25.8 wt.%, 188% and 16% higher than that of BNNSs without sonication exfoliation, respectively. The introduction of glucose not only augmented the friction force between adjacent BN layers to promote the efficiency of ball-milling-driven exfoliation supported by density functional theory calculation, but also reacted with active edges of BNNSs for functionalization. Afterwards, cosolvent-intensified sonication exfoliation strongly stabilized exfoliated BNNSs, obviously boosting the exfoliation yield. This proposed method is universal for preparing various 2D nanomaterials like molybdenum disulfide, tungsten disulfide, and graphene nanosheets. The thin plate structure and high functionalization ratio enabled the release of property superiorities of 2D nanomaterials. Our work offers a promising prototype to realize mass production of functionalized 2D nanomaterials.
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JOURNAL OF BIOMATERIALS SCIENCE-POLYMER EDITION
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2022
·
IF 3.682
Juan Wu,Xi Wang,Binglong Zhu,Qinting He,Yaheng Zhang,Wei Jiang
As one of the well-known anticancer drugs, methotrexate (MTX) has been limited in clinical application due to its side effects on normal tissues. This study focused on the one-step hydrothermal synthesis and in vitro evaluation of Fe3O4/RGO-PEI as MTX carriers for targeted anticancer therapy. In which, the Fe3O4 provided magnetic response properties; RGO acted as a stage for Fe3O4 loading and improved the dispersion of Fe3O4; polyethylenimine (PEI) was used as a surface modifier and a storehouse for MTX. The prepared Fe3O4/RGO-PEI nanocomposites exhibited a suitable size, good stability and magnetic responsibility. And the MTX loading content and loading efficiency were calculated to be 26.6% and 90.5%, respectively. What’s more, due to the diffusion and dissolution of PEI, the Fe3O4/RGO-PEI-MTX exhibited excellent pH-sensitivity, the values of MTX release rate (%) within 48 h at pH 5.8 and 4.0 were 64.3% and 87.4%, respectively. Furthermore, MTT assays in cancer cells (HepG2) and normal cells (HUVEC) demonstrated that Fe3O4/RGO-PEI-MTX exhibited high anticancer activity while low toxicity to normal cells, and also the Fe3O4/RGO-PEI composites were practically non-toxic. Thus, our results revealed that Fe3O4/RGO-PEI-MTX would be a competitive candidate for targeted delivery and controlled release of MTX.
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高影响因子
CHEMISTRY-A EUROPEAN JOURNAL
·
2023
·Vol. 29
·期 22
·e202203546
·
IF 4.3
Zhaohui Yang,Meilin Guo,Pengyu Meng,Min Jiang,Xiangyun Qiu,Jiao Zhang,Chaopeng Fu
Graphical The suitability of aqueous binders for aluminum ion batteries (AIBs), especially the compatibility with ionic liquids and the distribution on the cathode surface, is systematically investigated. Typically, AIBs with sodium alginate (Na−Alg) as binder exhibit outstanding electrochemical performance in terms of specific capacity, rate capability, and cycling stability. The incompatibility of poly(vinylidene difluoride) (PVDF) with acidic ionic liquid electrolytes and the use of toxic and high-cost N-methyl pyrrolidone (NMP) solvents hinder the wide application of aluminum-ion batteries (AIBs). In this work, sodium alginate (Na−Alg) is developed as an aqueous binder for the fabrication of graphite positive electrodes in AIBs. The compatibility of various binders with the ionic liquid electrolyte is evaluated, and interaction between various binders and graphite particles before and after cycling is compared and discussed. The results demonstrate that the well compatibility of Na−Alg in ionic liquids and its reasonable distribution on the graphite surface facilitate fast charge transfer and ion diffusion, reduce electrode polarization, and thus contributing to significantly improved cycling stability and rate capability of AIBs. This work provides a new insight into the development of low-cost, eco-friendly, and high-performance binders for AIBs.
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高影响因子
危险品化学品经营许可证（带存储）