RSC Advances
·
2020
·Vol. 10
·期 12
·7118-7124
·
IF 3.119
Botian Li,Yichi Zhang,Bo Yan,Da Xiao,Xue Zhou,Junwei Dong,Qiong Zhou
In this work, an AIE luminogen-based hydrogel with temperature-responsive fluorescence was designed and synthesized. The polymeric hydrogel consisted of a supramolecular network through coordination and ionic interactions. When the temperature was decreased, due to the motion restriction of the polyacrylic acid macromolecular segments and the enhancement in ionic interaction, the hydrogel exhibited a blue-shift in the fluorescence emission peak and increase in the fluorescence intensity, resulting in the visualization of fluorescence changes. The hydrogel network benefitted from non-covalent crosslinking and thus possessed self-healing properties at room temperature with good toughness and resiliency. Therefore, this fluorescent supramolecular hydrogel might be used as a temperature-responsive material.
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高影响因子
CERAMICS INTERNATIONAL
·
2020
·
IF 3.83
Guizhi Cao,Yingying Jiang,Feng Chen,Bingqiang Lu,Shuo Tan,Vivien Feng,Shengcai Qi,Shisheng He,Yuanzhi Xu,Xi Chen
As a chronic and infectious disease, dental caries has become a part of the heavy burdens of individuals and society, which is featured with tooth mineral loss and mainly caused by oral bacteria. Anti-caries agent should be safe, and capable of both high bacterial inhibition and remineralization, yet very few ones can meet these requirements simultaneously. In this study, a silver-doped amorphous calcium phosphate (Ag-EACP) is prepared by a biomimetic enzymatic reaction, with the in vivo energy storage biomolecule adenosine triphosphate disodium (Na 2 ATP) as the phosphorus source. Ag-EACP has an amorphous phase, with high content of ATP . The doped silver in the form of Ag + ion is stabilized against transformation, can help adjust the size of Ag-EACP. The Ag-EACP can effectively inhibit the growth of Streptococcus mutans and Lactobacillus acidophilus , two main cariogenic pathogens, both in planktonic and free states, and suppress the formation of bio-film. Moreover, this nanocomposite generates significant remineralization and micro-hardness recovery of initial caries lesion. Ag-EACP shows great anti-caries effects on initial caries lesions and is promising for caries prevention in dentistry.
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SCIENCE OF THE TOTAL ENVIRONMENT
·
2020
·
IF 6.551
Yangyang Liu,Tao Wang,Xiaozhong Fang,Yue Deng,Hanyun Cheng,Aziz-Ur-Rahim Bacha,Iqra Nabi,Liwu Zhang
The rapid sulfate formation is a crucial factor determining the explosive growth of fine particles and the frequent occurrence of severe haze events in China. Recent field observations also show that brown carbon is one of the most critical components in aerosol particles sampled during haze episodes. To this day, there is limited knowledge that accesses the role of brown carbon in atmospheric chemistry . In fact, these carbonaceous particulate matters , mainly derived from forest fires, biomass burning , and biogenic release, can act as photosensitizers and produce varieties of active intermediates to alter oxidation capacity. Experimental results in this work provide evidence that hydroxyl radical (∙OH) stems from brown carbon proxies fulvic acid /humic acid (FA/HA) upon irradiation, leading to rapid SO 2 oxidation on brown carbon particles in the atmosphere. Further correlation analyses for sulfate formation and chromophore properties of 12 model compounds demonstrate that brown carbon particles with higher aromaticity and E 2 /E 3 (the ratio of absorbance at 254 nm to that at 365 nm) would facilitate ∙OH production and SO 2 photo-oxidation. Uptake coefficient measurements and sulfate production rate estimation indicate that brown carbon could gain importance in atmospheric SO 2 oxidation. A better understanding of SO 2 uptake kinetics on brown carbon surfaces favors in defining new regulations to improve air quality and reduce the harmful effects of haze events on resident health and the environment.
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SEPARATION AND PURIFICATION TECHNOLOGY
·
2020
·
IF 5.774
Kaiqian Shu,Longhua Xu,Houqin Wu,Zhen Tang,Liping Luo,Jie Yang,Yanbo Xu,Bo Feng
Sodium alginate (SA) was investigated for use as a depressant in the spodumene–feldspar system. In this flotation system, the SA is added before the cation collector, dodecylamine (DDA). The effects of SA on mineral floatability were systematically investigated by flotation experiments, X-ray photoelectron spectroscopy (XPS), Fourier transform IR spectroscopy (FTIR), zeta potential measurements, and speciation analysis. Single-mineral flotation results showed that using 30 mg/L SA allowed the separation of spodumene from feldspar at pH 6, although there was a strong pH dependence. Zeta potential measurements and FTIR analysis showed that SA and DDA can adsorb onto both minerals. XPS analysis revealed the adsorption mechanism: the strong affinity of SA for the mineral surface arose from the complexation of SA and Al sites. Analysis of the surface and solution chemistry revealed that SA chelated Al 3+ or its hydroxides and hindered the subsequent adsorption of DDA, resulting in a hydrophilic feldspar surface. In addition, there were more aluminium hydroxides and unsaturated O atoms on the spodumene surface than on that of feldspar, and these provided available sites for the adsorption of DDA to form a stable reticular structure with SA, thus improving the floatability of the spodumene at certain pH values. Lastly, a model for SA and DDA adsorption at the water–solid interface is proposed.
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APPLIED SURFACE SCIENCE
·
2020
·
IF 6.182
Qingdong Qin,Na Qiao,Yahong Liu,Xian Wu
The morphology and structure of heterogeneous catalysts play crucial roles in peroxymonosulfate (PMS) activation by providing much more available active sites and high chemical stability. In this work, spongelike porous CuO (SP-CuO) was synthesized and used as a PMS activator to degrade Acid Orange 7 (AO7) from aqueous solution. The morphology and property of SP-CuO were characterized using various techniques. The results showed that nanoparticles of SP-CuO with uniform in size were agglomerated together to form a porous spongelike texture. In the catalytic experiments, SP-CuO showed highly effective in heterogeneous activation of PMS compared to commercial CuO and Co 3 O 4 . The first-order rate constant of SP-CuO was approximately 3.9 and 4.4 times greater than that of commercial CuO and Co 3 O 4 , respectively. The effects of experimental parameters including PMS dose, AO7 concentration, catalyst dosage, temperature and pH were systematically investigated. The highest degradation rate was achieved at pH 7.0. The activation energy of SP-CuO was obtained as 21.6 kJ mol −1 . Sulfate radical (SO 4 − ), mainly generated through heterogeneous reaction, was the dominant reactive species for AO7 degradation. Moreover, SP-CuO remained good activity and stability after being recycled five times, demonstrating its potential environmental application in the treatment of dye wastewater.
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ENERGY & FUELS
·
2020
·
IF 3.421
Pan Li,Zeji Du,Chun Chang,Shiqiang Zhao,Guizhuan Xu,Chunbao Charles Xu
Artificial intelligence approach can be used to solve complicated process problems. A hybrid methodology comprising artificial neural network (ANN) and genetic algorithms (GA) was utilized to model and optimize the methanolysis process of waste peanut shells. Acid catalytic methanolysis of waste peanut shells into liquid biofuel-methyl levulinate (ML) was investigated. The combination of sulfuric acid with extremely low concentration and Al2(SO4)3 was identified as the efficient mixed acid catalytic system. The ML yield under optimal conditions optimized by response surface methodology (RSM) was 16.49%, while the ML yield optimized by ANN–GA was 17.61%. The results showed that ANN–GA had a higher optimizing ability than the RSM model. Meanwhile, the methanolysis kinetics provided insights into the reaction routes for ML production. Moreover, Al2(SO4)3 can be recycled and reused five times without much decrease of the ML yield. This study suggested that waste peanut shells can be used as potential raw materials for ML production and ANN–GA can serve as a powerful tool for biofuel processing technology.
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ENERGY & FUELS
·
2021
·
IF 3.605
Congsu Niu,Lianyuan Ji,Yao Chen,Shuai Ma,Yiwei Zhang,Xiaomin Liu,Hui Yang
Sodium–metal chloride batteries are usually operated at a relatively high temperature (270–350 °C) to achieve adequate electrochemical performance. Such a high operating temperature may cause several issues and limit their widespread applications. Lowering the operating temperature may alleviate these issues, which can be achieved by reducing the ohmic resistance of a Na−β″-Al2O3 solid electrolyte (BASE) and incorporating a low-melting-point catholyte. Herein, a planar sodium–copper chloride battery is evaluated at intermediate temperatures (from 100 to 175 °C) with a thin BASE disk (500 μm) and a room-temperature ionic liquid (RTIL). The RTILs at various concentrations (0.1–0.75 mol L–1) are prepared by dissolving different amounts of sodium bis(trifluoromethanesulfon)imide (NaTFSI) into 1-ethyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide ([EMIm][TFSI]) and used as the catholyte. The effect of NaTFSI addition in [EMIm][TFSI] on the physical properties of the catholyte is examined. With 0.5 mol L–1 NaTFSI in [EMIm][TFSI] ionic liquid to assemble the Na/CuCl2 battery, the fabricated cell delivers a capacity up to 146.5 mAh g–1 when cycled at 175 °C with the current density of 2 mA cm–2 and retains 94.5% capacity after 20 cycles. Moreover, the battery can run steadily at 130 °C and show a reversible capacity of 79.2 mAh g–1 when the operation temperature is set as low as 100 °C. To the best of our knowledge, these are the lowest operation temperatures reported thus far for sodium–metal-chloride-based cells.
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CATALYSIS LETTERS
·
2021
·Vol. 152
·期 4
·1170-1181
·
IF 3.186
Zhang Xilun,Liu Lin,Feng Ji,Ju Xiaohua,Wang Jiemin,He Teng,Chen Ping
Abstract Development of efficient catalysts for ammonia decomposition is crucial for hydrogen production from ammonia. Herein, Ru nanoparticles (NPs) highly dispersed on Pr 2 O 3 (Ru/Pr 2 O 3 ) were prepared and investigated as catalyst for ammonia decomposition reaction. Under relatively high weight hourly space velocity (WHSV = 30,000 mL g cat −1 h −1 ), the Ru/Pr 2 O 3 achieves a H 2 production rate of 20.9 mmol g cat −1 min −1 at 450 °C, which is superior to Ru/Pr 6 O 11 and many other typical oxides supported Ru catalysts. Detailed characterization results demonstrate that Pr 2 O 3 has high density of basic sites, abundant oxygen vacancies, and strong interaction with Ru, which can modulate electronic properties of Ru NPs and enhance the intrinsic activity of the catalyst, making the catalyst highly active for ammonia decomposition. Moreover, the Ru/Pr 2 O 3 catalyst also exhibits excellent stability and can maintain its high activity for over 100 h. The use of Pr 2 O 3 as support offers opportunity to improve the catalytic performance of Ru-based catalysts for ammonia decomposition. Graphic Abstract
The high density of basic sites, abundant oxygen vacancies of Pr 2 O 3 , and the strong metal–support interaction effectively promote the electron donation to Ru nanoparticles, enabling the superior catalytic performance of Ru/Pr 2 O 3 for ammonia decomposition.
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JOURNAL OF HAZARDOUS MATERIALS
·
2021
·
IF 10.588
Xiangnan Zhang,Ke Shi,Yuning Liu,Yifan Chen,Kai Yu,Yingying Wang,Hong Zhang,Jie Jiang
Nanoplastics are an emerging topic and have attracted increasing attention due to their widespread existence and potential toxicity on living organisms. The challenges of analytical methods for nanoplastics hinder the deeper understanding of toxicological effects and risk assessment of nanoplastics. In this work, a custom-built electromagnetic heating pyrolyzer was coupled to mass spectrometry for the rapid analysis of nanoplastics. Nanoplastics/microplastics were collected on the heat-resisting filter papers, then directly decomposed into gaseous products in the pyrolyzer and analyzed by mass spectrometry . The polystyrene nanoparticles were used to verify the performance of mass-traced quantification, and recoveries of 106–121% and precision of 9% were obtained. As a proof-of-principle experiment, the saline solution packed by polypropylene infusion bottles was aged for simulating indoor sunlight storage, where nanoplastics/microplastics were analyzed. The abundance models of nanoplastics/microplastics in the saline infusion bottle with aging time were assessed from both quality and quantity, for the first time. Results showed that nanoplastics/microplastics in medical infusion products could be generated under indoor sunlight exposure, which needs more attention due to the potential health risks. The proposed electromagnetic heating pyrolysis-mass spectrometry could be a promising method for assessing nanoplastics/microplastics.
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MATERIALS RESEARCH BULLETIN
·
2021
·
IF 4.641
Ling Li,Zeyuan Ma,Lu Liu,Xiaohui Wang,Jianguo Wang,LiYe Cao,Shuang Liu,Wenming Zhang
Herein, a composite of carbon fibers coated with bimetallic oxide NiCo 2 O 4 are successfully synthesized by combination of electrospun and hydrothermal methods and applied as counter electrode (CE) catalytically for dye-sensitized solar cells (DSSCs). SEM images show the homogeneous distribution of NiCo 2 O 4 nanosheets on the surface of CNFs, which provides enough active centers for electron collection and transmission and makes larger surface area. More importantly, the NiCo 2 O 4 /CNFs CE exhibits high efficiency and electrochemical stability, of which the short circuit current density ( J sc ) reachs 17.11 mA cm −2 . Due to the employment of NiCo 2 O 4 /CNFs composite as CE, the photoelectric conversion efficiency has achieved 7.80%, obviously higher than those of CNFs (5.75%) and Pt (7.35%).The cost-effective NiCo 2 O 4 /CNFs composite may be used to replace the conventional Pt CEs alternatively.
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MACROMOLECULAR RESEARCH
·
2021
·Vol. 29
·期 7
·462-469
·
IF 2.227
Wang Lei,Yan Shijing,Zhang Lei,Mai Yuliang,Li Weihao,Pang Hao
The degradation and recycling of waste epoxy resin products is an urgent environmental problem. To solve this issue, we use acid-/base-degradable 1,1′,1″-(1,3,5-hexahydro-s-triazine-1,3,5-triyl) tris(3-ethylamino-propan-1-one) (TAHT-EA) as curing agent to introduce the hexahydro-s-triazine (HT) ring structure into the cross-linking network to prepare degradable epoxy resin. Specifically, 1,3,5-triacryloylhexahydro-1,3,5-triazine (TAHT) and ethylamine quickly complete the Aza-Michael addition reaction at the interface of chloroform and water droplets under the catalysis of water. The FTIR spectra, NMR spectrum and mass spectrum show that mono- and bis-addition products of ethylamine coexist in the product in which the content of the primary addition product reaches 97%. TAHT-EA can be decomposed by acid and base solutions. Through NMR analysis of the degradation products, it can be explained that the degradation mechanisms are different. The breaking of amide bonds and HT rings in acid solution and the cracking of amide bonds in base solution are speculated to be the main mechanisms under these two different circumstances, respectively. We tested the mechanical, thermal and degradation properties of the epoxy resin cured by TAHT-EA, and compared it with the epoxy resin cured by 4,4′-diaminodiphenylmethane and triethylenetetramine. TAHT-EA-cured epoxy resin shows comparable mechanical properties with Young’s modulus up to 2.05 GPa and tensile strength up to 70.9 MPa. What is more, it degrades completely by 1 M H + /OH − solution at 60 °C within 36 h. Nevertheless, it exhibited a relatively low crosslinked density (633 mol/m 3 ) and low heat resistance (the initial decomposition temperature is lower than 205 °C). Overall, TAHT-EA cured epoxy resin has the potential to gradually replace traditional thermosetting resin, thereby solving the environmental problems caused by discarded epoxy resin products.
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APPLIED ORGANOMETALLIC CHEMISTRY
·
2021
·Vol. 35
·期 12
·e6445
·
IF 4.105
Yijun Du,Faliang Gou,Danning Gao,Zhifeng Liu,Linjun Shao,Chenze Qi
In this study, palladium-encapsulated poly(amic acid) (Pd@PAA) nanofibers were prepared by electrospinning, followed by thermal imidization to synthesize palladium-encapsulated polyimide (Pd@PI) nanofibers. Scanning electron microscopy (SEM) images confirmed the preparation of uniform and smooth Pd@PAA and Pd@PI nanofibers. Thermogravimetric analysis (TGA) results reveal that the Pd@PI nanofibers possessed excellent thermal stability. The dispersion of palladium nanoparticles in the polyimide nanofibers was characterized by transmission electron microscopy (TEM) and X-ray diffraction (XRD). The catalysis results show that this Pd@PI fibrous catalyst was very efficient to catalyze the cross-coupling reactions of aromatic iodides with n -butyl acrylate (Heck reaction) or phenylboronic acid derivatives (Suzuki reaction) to afford the desired products in good to excellent yields. Moreover, the Pd@PI catalyst could be easily separated and recovered from the reaction mixture by simple filtration due to the regular fibrous structure and reused for 10 times for both Heck and Suzuki reactions without obvious loss of its initial catalytic activity. Thus, the Pd@PI nanofiber catalyst holds great potential in chemical industry in terms of its excellent catalytic activity and stability.
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危险品化学品经营许可证（带存储）