MATERIALS & DESIGN
·
2023
·
IF 8.4
Xue-Fen Zhang,Xu-Dong Li,Ning Wang,Yong-Jiang Liu,Feng Tian,Chen-Xiang Wang
In this work, a robust epoxy adhesive (EP) @ superhydrophobic SiO 2 (SH-SiO 2 )-based superhydrophobic coating was prepared on the aluminum substrate by a simple one-step spraying strategy. The prepared EP@SH-SiO 2 coating exhibits hierarchical micro/nanostructures and is capable of maintaining a contact angle of more than 150° after 1000 cm of abrasion length and 80 tape-peeling repetitions. Molecular dynamics (MD) simulations and quantum mechanics calculations show that the improved mechanical resistance is attributed to the enhanced interfacial interaction between the EP@SH-SiO 2 coating and the underlying substrate induced by the epoxy adhesive. Electrochemical measurements in 3.5 wt% NaCl solution show the corrosion inhibition efficiency of the EP@SH-SiO 2 coating reaches up to 99.99%, and even after 8 days of immersion, the low frequency impedance modulus of the EP@SH-SiO 2 sample is still ∼1 order of magnitude higher than that bare aluminum, demonstrating excellent long-term corrosion protection. The diffusion behavior of the corrosive medium in the EP@SH-SiO 2 coating was revealed by MD simulation to support the experimental results. Additionally, the EP@SH-SiO 2 coating exhibits good chemical stability and hydrophobic repair properties. This work will provide a new perspective for the preparation and study of robust superhydrophobic aluminum for corrosion protection properties.
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高影响因子
Sustainability
·
2022
·Vol. 14
·期 24
·16419
·
IF 3.889
Zhiwei Wang,Shijun Zhu,Jing Deng,Haojie Li,Liang Wang,Haojin Luo,Zehe Tang,Xueyan Li
Iron-rich sludge, generated during flocculation/sedimentation processes by using Fe-based coagulant in drinking water treatment plants, could be used as a precursor to prepare an effective peroxymonosulfate (PMS) activator (Fe3O4@SiO2) for the ciprofloxacin (CIP) degradation via facile hydrothermal treatment. The catalytic performances of raw iron-rich sludge and Fe3O4@SiO2were evaluated. The removal rate of CIP in Fe3O4@SiO2/PMS system increased from 44.7% to 82.8% within 60 min compared with the raw iron-rich sludge. The effects of PMS, catalyst loadings, temperature, and initial pH on the CIP degradation were examined, demonstrating that acidic conditions and higher temperatures were beneficial for CIP degradation. Both sulfate radicals (SO4•−) and hydroxyl radicals (•OH) contributed to the CIP degradation, and SO4•−was predominated in the Fe3O4@SiO2/PMS system, which was confirmed by the result of electron paramagnetic resonance (EPR) analysis and radical quenching tests. The mechanisms of the PMS activation process by Fe3O4@SiO2were elucidated, and the influencing factors were among which the role of the iron mineral phase was emphatically explored. This study provides a facile method to convert the recycled waste iron-rich sludge to magnetic heterogeneous catalysts for CIP degradation with PMS activation.Keywords:iron-rich sludge;Fe3O4@SiO2catalyst;peroxymonosulfate activation;ciprofloxacin;waste recycling
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高影响因子
NEW JOURNAL OF CHEMISTRY
·
2023
·Vol. 47
·期 9
·4529-4536
·
IF 3.3
Huanyu Chen,Jia-Qi Bai,Yuxue Wei,Jingshuai Chen,Song Sun,Chang-Jie Mao
The exploration of high-efficiency and Earth-abundant electrocatalysts for the oxygen evolution reaction (OER) remains a tremendous challenge. Herein, an ultrafine FeNi–Mo2C composite immobilized on the surface of SiO2 support is fabricated through annealing a mixture of Fe, Ni and Mo precursors and SiO2 nanospheres. The electronic structure of the FeNi alloy is tuned by combining with Mo2C, forming a hybrid architecture with enhanced intrinsic activity of active sites. The introduced SiO2 nanospheres reduce the nanoparticle size of the FeNi–Mo2C composite, further increasing the population of the surface electrochemically active sites. Benefiting from the compositional and structural merits, the FeNi-Mo2C@SiO2 electrocatalyst exhibits excellent OER behavior with a small overpotential of 180 mV to reach a current density of 10 mA cm−2, an ultra-small Tafel slope of 11.0 mV dec−1, and good stability in alkaline media. The outstanding OER performance is attributed to the increased number and enhanced intrinsic activity of active sites due to the synergistic effect of each component. This study provides a promising way to design and develop an advanced electrocatalyst towards water oxidation.
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高影响因子
APPLIED CLAY SCIENCE
·
2022
·
IF 5.907
Xiaohua Tian,Sujun Tian,Lulu Wang,Yanping Yang,Ruilong Zhang,Jiangdong Dai,Jianming Pan
The easy preparation of robust superwetting materials for oily wastewater disposal still remains a challenge. Inspired by the self-cleaning and mechanical properties of natural nacre underwater, herein, we have successfully developed sphere-rod quaternary artificial nacre-inspired meshes (named GO-PEI-SiO 2 -Hal) via interfacial self-assembly using 2D graphene oxide nanosheets , hyperbranched polyethyleneimine, SiO 2 nanospheres , and hollow halloysite nanotubes (Hal) as the building blocks. The nacre-like “brick-and-mortar” layered microstructure was successfully formed and tightly coated to the mesh, showing excellent mechanical properties with Young's modulus up to 19.7 ± 2.6 GPa. Compared to the ternary structures, the quaternary sphere-rod morphology improved the surface roughness , and these four organic/inorganic building blocks are all hydrophilic , which together resulted in the superhydrophilic and underwater superoleophobic characteristics. The effects of building block concentration, dipping number, and mesh size on wettability and oil-water separation performance were studied in detail. The optimal (GO-PEI-SiO 2 -Hal-1) 15 @Fe 300 mesh showed an underwater oil contact angle of 159 o for 1,2-dichloroethane, low oil adhesion, and excellent separation efficiency up to 99.8% at an ultrahigh flux up to 195,038 L m −2 h −1 . This nacre-like mesh exhibited excellent salt tolerance, acid-alkali resistance, recycling ability, and mechanical properties for practical oily wastewater treatment .
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高影响因子
WASTE MANAGEMENT
·
2023
·
IF 8.1
Cong Li,Xiaofeng Yang,Yongkui Li,Yu Chen,Xiaodong Pan,Yongping Xie,Xingyu Liu,Suqin Li
Hematite tailings (HTs) are rich in silica and are used as replacements for fine aggregates in the preparation of construction materials. However, there is scope for a more effective utilization of the valuable elements present in HTs. In this paper, a process for preparing high-purity SiO 2 using HTs procured from Ansteel (China) is proposed. HTs were treated using the superconducting high-gradient magnetic separation (S-HGMS) technology, where the silica as part of the nonmagnetic fraction was obtained in the form of a high-silica concentrate, which was then subjected to mixed-acid leaching to dissolve impurities to achieve refined purification. The optimum process conditions for S-HGMS were determined, and the response surface methodology was applied to optimize the process parameters of the mixed-acid leaching process. The process indicators of the mixed-acid leaching step included the leaching time, leaching temperature, and molar ratio of the mixed acids. The optimum process conditions for S-HGMS were as follows: the magnetic strength-to-velocity ratio in the weak magnetic separation stage was set to 0.034 T·s/m whereas it was maintained at 0.076 T·s/m in the strong magnetic separation stage; the pulp concentration was 40 g/L, the pulp velocity was 500 mL/min, and the dispersant concentration was 1 mg/g. Under these conditions, the high-silica pulp was processed. The corresponding SiO 2 grade increased from 71.788 % to 95.260 %, and its recovery and yield reached 56.330 % and 42.450 %, respectively. The SiO 2 content in the sample increased from 95.260 % to 99.961 %. Further, the mechanisms of the S-HGMS and mixed-acid leaching were revealed. The proposed process is environmentally friendly and operationally inexpensive. It can reduce the amount of HTs by 42.450 %, and the obtained high-purity silica product has high economic value and good industrialization prospects.
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PubMed
高影响因子
Small
·
2023
·Vol. 19
·期 44
·2303044
·
IF 13.3
Yuqi Xie,Zhaohui Li,Yawen Zhang,Yunjie Lu,Jianming Zhang,Lu Zong
Lightweight porous hydrogels provide a worldwide scope for functional soft mateirals. However, most porous hydrogels have weak mechanical strength, high density (>1 g cm −3 ), and high heat absorption due to weak interfacial interactions and high solvent fill rates, which severely limit their application in wearable soft-electronic devices. Herein, an effective hybrid hydrogel-aerogel strategy to assemble ultralight, heat-insulated, and tough polyvinyl alcohol (PVA)/SiO 2 @cellulose nanoclaws (CNCWs) hydrogels (PSCG) via strong interfacial interactions with hydrogen bonding and hydrophobic interaction is demonstrated. The resultant PSCG has an interesting hierarchical porous structure from bubble template (≈100 µm), PVA hydrogels networks introduced by ice crystals (≈10 µm), and hybrid SiO 2 aerogels (<50 nm), respectively. PSCG shows unprecedented low density (0.27 g cm −3 ), high tensile strength (1.6 MPa) & compressive strength (1.5 MPa), excellent heat-insulated ability, and strain-sensitive conductivity. This lightweight porous and tough hydrogel with an ingenious design provides a new way for wearable soft-electronic devices.
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PubMed
高影响因子
APPLIED SURFACE SCIENCE
·
2023
·
IF 6.7
Yuanchuan Ma,Jiao Wei,Jialong Zhu,Yang Hu,Yuquan Cai,Jieyuan Zheng,Hong Fan
It remains a challenge to explore a low-cost and green approach to prepare stimuli-responsive materials that can meet increasingly complicated separation demands. Herein, we report a facile method to prepare pH-responsive silica particles modified by abundant carboxyl groups (SiO 2 -COOH), which are introduced from bio-based ricinoleic acid via an efficient and mild thiol-ene click reaction. The hierarchical structure of SiO 2 -COOH can easily construct roughness that is essential for special wettability, which is demonstrated by the robust superhydrophobicity achieved synergistically with non-pH-responsive binder on different substrates and no significant change after 100 peels or extrusions. We also present the efficient separation of different oil–water mixtures by modified fabrics and sponges, respectively, based on their fast wettability transition within seconds at different pH. More importantly, benefiting from the chelation of carboxyl and hydroxyl groups from ricinoleic acid molecules and large specific surface area provided by the hierarchical structure, SiO 2 -COOH and its different alkali treatment products exhibit outstanding adsorption capacity to heavy metal ions and organic dyes, of which up to 180 mg/g for Pb 2+ . It is believed that the proposed novel and eco-friendly method is a promising candidate for the simultaneous removal of multiple pollutants from oily wastewater.
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高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2022
·
IF 16.744
Rihong Xiao,Yili Zhang,Shuzhou Wei,Xing Chuai,Xiangzheng Cui,Zhuo Xiong,Junying Zhang,Yongchun Zhao
Massive Hg emissions from coal-fired units cause serious environmental pollution and result in a substantial waste of Hg resources. In this study, the prepared millimeter-grade Se/SiO 2 adsorbent was applied as a filler to adsorb mercury in a fixed-bed reactor to obtain the high value-added product HgSe, which solved the problem of short contact time and secondary pollution caused by the traditional injection mercury removal adsorbents. Experimental Hg removal showed that the 25 % Se-loaded adsorbent exhibited excellent Hg removal performance at 150 °C, with a saturation adsorption capacity of mercury was as high as 101.04 mg/g, nearly 300 times that of commercial activated carbons. Additionally, the influence of the flue gas composition on the Hg removal performance of Se/SiO 2 was studied. The results showed that O 2 , NO, and HCl increased the efficiency of Hg removal and SO 2 and SO 3 had trivial impact on the Hg removal performance. The Hg temperature-programmed desorption test results showed that the adsorbed Hg appeared predominantly as HgSe on the sample surface. DFT calculations verified that Se loading improved Hg removal performance and defined the adsorption mechanism. Moreover, the prepared Se/SiO 2 adsorbent carrier was soluble SiO 2 , which provided a good condition for the subsequent high-purity collection of HgSe. Finally, the technological process of Hg removal via Se-loaded adsorbents and the recovery of HgSe were proposed, which could offer a new way to achieve the resource utilization of Hg.
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高影响因子
COMPOSITES PART B-ENGINEERING
·
2022
·
IF 11.322
Lili Ma,Hui Liu,Xin Wen,Karolina Szymańska,Ewa Mijowska,Chuncheng Hao,Tao Tang,Qingquan Lei
It is still a great challenge to develop epoxy resin/glass fabric (EP/GF) composites with well-balanced enhancements on flame retardancy and mechanical properties . Herein, a novel strategy that polyhydric SiO 2 coating assistant to graft organophosphorus (DOPO) onto GF was developed for simultaneously improving flame retardancy and mechanical properties of EP composites. The grafting amount of DOPO could reach to 43.64 wt% via the helpful bridging of polyhydric SiO 2 , so that EP composites displayed excellent flame retardancy with the LOI of 37.2%, the V0 rating on UL-94 and a 63.3% decrease on PHRR in cone calorimeter test. According to the analysis of char morphology and structure, the flame retarded mechanism was mainly ascribed to the enhanced barrier effect of a continuous and intergrow char layer, which was composed of GF@SiO 2 as framework and P-containing condensed carbon as stuffing. Meanwhile, EP composites exhibited outstanding mechanical performances with 35% and 60% increases on tensile strength and impact strength respectively, which resulted from the special molecular structure of GF@SiO 2 - g -DOPO with strong interfacial adhesion with EP chains via hydrogen bond and chemical bond. In summary, this work will be favorable to design multifunctional polymer composites with well-balanced comprehensive performances, and expand their widespread applications in high-end fields.
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高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2022
·
IF 9.221
Tong Feng,Kaicha Chen,Jiamiao Zhong,Yaxin Cheng,Hongli Zhao,Minbo Lan
Arsenic(III) is a highly toxic pollutant in the environment, and the development of nanomaterials with high electrochemical activity for As(III) detection is a research focus at present. Herein, an electrochemical sensing platform based on polyaniline nanofibers embedded with Ag@SiO 2 nanoparticles (Ag@SiO 2 /PANI NFs) was successfully constructed for trace As(III) determination. Owing to an in-situ chemical oxidation polymerization strategy, the polyaniline nanofibers loaded with Ag@SiO 2 core-shell nanoparticles blossomed into the dendritic three-dimensional network. The unique structure with a huge specific surface area greatly enhanced the adsorption efficiency of As(III). Combined with the outstanding conductivity of polyaniline and the electrocatalytic ability of uniformly dispersed AgNPs, the stripping current signal of As(III) was further amplified. Based on the optimized conditions, the sensitivity of 0.83 μA μg −1 L was obtained in the linear range of 0.1 ~ 100 μg L −1 with a low detection limit of 0.013 μg L −1 . And the selectivity, reproducibility, and long-term stability of this sensor were excellent. Additionally, satisfactory results were achieved by the recovery experiment of real samples, and the accuracy of this method was verified by comparison with ICP-MS. The above results demonstrated the promising application of the as-fabricated sensor in As(III) detection.
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高影响因子
PACKAGING TECHNOLOGY AND SCIENCE
·
2022
·Vol. 35
·期 7
·557-567
·
IF 2.545
Rongkun Liu,Meijie Qu,Xuewen Qiu,Hai Wang,Mingshuai Fan,Ali Zhang,Qiushan Chen,Yuezhen Bin
Aiming at development of novel medical packings, poly (ethylene terephthalate) (PET)-based membranes with hydrophobic and antibacterial properties were prepared by electrostatic spinning of a blend of thermoplastic polyurethane (TPU), nano SiO 2 and Ag particles on PET nonwoven. In cooperation with electro-spun TPU/SiO 2 layer, the water contact angle (WCA) of PET nonwoven fabric was improved from 60° to 115–130°, and the water vapour transmission rate was 2200–2500 g/m 2 /24 h. It indicates that the modified PET nonwoven membrane exhibits a much better water resistance, highly increased hydrophobicity and moderate water permeability. Nano-silver provided excellent antibacterial properties for this non-cytotoxic PET/TPU/SiO 2 /Ag composite membranes. The PET/TPU/SiO 2 /Ag composite membranes had high mechanical properties, which exhibited a tensile strength of 56 MPa in the longitudinal direction and 35 MPa in the transversal direction, and tear strength of 30 kN/m in the longitudinal direction and 48 kN/m in the transversal direction. This new PET/TPU/SiO 2 /Ag composite membranes showed broad application prospects in the medical packaging industry.
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高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2022
·Vol. 139
·期 26
·e52432
·
IF 3.057
Jialiang Chen,Chichao Li,Xi Chen,Xuming Zhang,Hongbing Jia,Zhenyang Luo,Yanlong Luo
Epoxidized solution-polymerized styrene butadiene rubber (ESSBR) with different epoxidation degrees was prepared using formic acid as a catalyst. Experimental methods and density function theory calculation confirms that peroxyformic acid preferentially attacks trans-1,4-butadiene, and then cis-1,4-butadiene, and 1, 2-butadiene is not epoxidated due to high energy barrier. Two SiO 2 /graphene oxide hybrids covalently linked with bis-[3-(triethoxysilyl)propyl]-tetrasulfide or 3-aminopropyltriethoxysilane (KH550) were prepared and named SiO 2 @TESPT@GO and SiO 2 @KH550@GO, respectively. The results for ESSBR composites filled by hybrid fillers indicate that the increase of epoxy degree can greatly improve the wet skid resistance while maintaining rolling resistance. Besides, in the case of the same epoxy degree, the rolling resistance of composites using hybrid fillers is lower than that of using SiO 2 only. Notably, the SiO 2 @TESPT@GO/ESSBR composite with high epoxy degree (10.09%) has a good balance between wet skid resistance and low rolling resistance. Molecular dynamics simulation was further employed to perform fixed and cyclic stretching to give the mechanism for mechanical properties. Binding energy and mean square distance illustrate that that as the epoxy degree increases, on the one hand, the strong filler-matrix interactions will make the movement of ESSBR chains keep up with the strain. On the other hand, the strong filler-matrix and inter-chain interactions provide more friction. These two factors lead to an increase in hysteresis loss. Besides, only moderate filler-matrix interaction is conducive to the improvement of wet skid resistance, and too strong or too weak interaction is unfavorable.
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危险品化学品经营许可证（带存储）