E-POLYMERS
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2020
·Vol. 20
·期 1
·303-316
·
IF 1.675
Haihua Yu,Xiuhang Xu,Yunfei Xia,Mingzhen Pan,Nighat Zarshad,Bo Pang,Anis Ur Rahman,Min Wu,Henmei Ni
According to the concept of fire life cycle assessment (LCA), a new type of intumescent flame retardant was designed and synthesized by chemically bonding chitosan, phosphorus pentoxide and melamine. The resultant compound, chitosan ethoxyl melamine phosphate (CEMP), was characterized by FTIR, 1 H NMR, 31 P NMR, XRD and SEM. The performance of CEMP and organic montmorillonite (OMMT) was evaluated in the substrate of epoxy resin (EP) with limited oxygen index (LOI), UL-94, cone calorimetric test (CCT), TGA and TG-IR. As a result, intumescent flame retardant EP (EP3) containing 30.6% LOI and V-0 rating was prepared by adding 3 wt% OMMT and 15 wt% CEMP. The CCT results indicated that CEMP and OMMT reduced the peak of heat release rate (PHRR) to about one fourth that of pure EP and total heat release (THR), 1/2. Decomposition of EP and EP3 was traced from 100 to 600°C by TG-IR.
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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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Journal of Materials Chemistry C
·
2020
·Vol. 8
·期 42
·14723-14731
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IF 7.059
Lele Li,Liwei Yang,Si Zhang,Yuping Sun,Fen Li,Tengteng Qin,Xiaoqiang Liu,Yanmei Zhou,Subbiah Alwarappan
Herein, we designed a NiCo2S4@N/S–CeO2 composite with amplified electrocatalytic oxygen reduction (OR) capability by the in situ growth of NiCo2S4 nanoparticles on CeO2 nanospheres with simultaneous doping of nitrogen and sulfur. After optical characterization of the composite, it was then employed as the signal amplification label for constructing an electrochemical aptasensor. The composite provides a biocompatible and large surface platform to load biomolecules and retain their bioactivity. More importantly, the composite shows a comparable electrocatalytic OR capability similar to a commercial Pt/C catalyst and far better than CeO2, attributed to the NiCo2S4 deposition and oxygen vacancies introduced by N and S doping. Furthermore, the Koutecky–Levich plots indicate a nearly four-electron transfer pathway of the ORR. The as-prepared aptasensor exhibited a highly sensitive and selective determination of a model analyte-sulfadimethoxine with a wide linear range of 0.05–180 nM, a low detection limit of 0.02 ± 0.0011 nM and good feasibility for real-sample detection. This work paved an effective way for the design of highly efficient electrocatalysts with bright prospects in bioanalytical applications.
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DALTON TRANSACTIONS
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2020
·Vol. 49
·期 31
·10918-10927
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IF 4.174
Yaru Yang,Hao Wan,Gen Chen,Ning Zhang,Junhui Li,Wei Ma,Xiaohe Liu,Renzhi Ma
Because of their low cost and Earth-abundant characteristics, materials based on 3d transition metals have attracted great research interest and are considered as promising electrocatalysts for the oxygen evolution reaction (OER), besides the commercial noble metal-based materials, in recent years. In order to improve electrocatalytic activity, it is necessary to design the structures and compositions of electrocatalysts. In this study, a series of multi-shelled CoxNi1−x oxide/phosphide hollow spheres with tunable element ratios were prepared. The electrocatalytic activity of the multi-shelled CoxNi1−x oxide/phosphide is strongly dependent on the molar ratio of Co and Ni. Based on the combined advantages of complex structures and compositions, the multi-shelled Co0.5Ni0.5 oxide/phosphide displays outstanding electrocatalytic performance in terms of high activity and stable durability for the OER, surpassing those of RuO2 and multi-shelled CoxNi1−x oxide/phosphide with other element ratios of Co and Ni. This result suggests a great possibility of rationally designing the composition for highly efficient electrocatalysts.
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PubMed
高影响因子
Water
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2020
·Vol. 12
·期 6
·1838
·
IF 2.544
Kangquan Qi,Mei Chen,Ruobin Dai,Qiang Li,Miaoju Lai,Zhiwei Wang
The removal of pharmaceutical and personal care products (PPCPs) from water and wastewater is of great significance for eco-system safety. In this study, an electrochemical ceramic membrane bioreactor (ECMBR) was developed for removing seven groups (24 kinds in total) of PPCPs from real wastewater. In the presence of an electric field (2 V/cm), the ECMBR could enhance the removal efficiencies for most targeted PPCPs without having adverse impacts on conventional pollutant removal and membrane filtration. The ECMBR achieved higher removal efficiencies for fluoroquinolones (82.8%), β-blockers (24.6%), and sulfonamides (41.0%) compared to the control (CMBR) (52.9%, 4.6%, and 36.4%). For trimethoprim, ECMBR also significantly increased the removal to 66.5% compared to 15.6% in CMBR. Furthermore, the exertion of an electric field did not cause significant changes in microbial communities, suggesting that the enhanced removal of PPCPs should be attributed to the electrochemical oxidation of the built-in electrodes in the ECMBR.Keywords:pharmaceutical and personal care products;electrochemical membrane bioreactor;advanced oxidation process;membrane filtration;wastewater treatment
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TRANSITION METAL CHEMISTRY
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2020
·Vol. 45
·期 7
·493-500
·
IF 1.366
Yang Xinda,Gu Shunxin,Jiang Qin,Wang Yanqing,Wang Daqi,Shi Pengfei
Abstract A Cu(II) complex [Cu 2 (phen) 2 (NAB) 2 (HO)] n (phen = 1, 10-phenanthroline and NABH = p -N, N-(2-hydroxyethyl)amino benzoic acid) was synthesized, and its structure was confirmed by X-ray diffraction. The structure of the complex appeared to be clamp-like, in which Cu(II) atoms adopt distorted square pyramidal geometry. Each Cu(II) is coordinated by two nitrogen atoms in phen ligand and two carboxyl oxygen atoms from each of the two NABH ligands. The clamp-like coordination units are bridged by adjacent hydroxyethyl groups into infinite 1D chain, which are further linked by extensive O···H hydrogen bonds and π–π interactions to form 3D networks. The titled complex displayed weak double-stranded DNA interaction activity. Spectroscopic and theoretical simulation results indicated that the complex attached onto DNA surface through hydrogen bonding with base pairs. Graphic abstract A novel benzoic acid derivative with two extremity hydroxyethyl groups was designed and used as auxiliary ligand to synthesize mixed coordinating clamp-like Cu(II)-phenanthroline complex. Hydrogen bonding played crucial role in bridging the clamps into infinite 1D chain and also the DNA complex interaction mode.
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Materials Today Energy
·
2020
·
IF 5.604
Qi Sun,Shaoying Wang,Liangling Sun,Jia Liang,Balaji Devakumar,Xiaoyong Huang
At present, near-ultraviolet-pumped white light-emitting diodes (LEDs) based on tri-color (blue, green, and red) phosphors still suffer from insufficient color rendering index (CRI), due to the presence of cyan gap in the 480–520 nm spectral range. To solve this problem, it is urgent to develop an efficient cyan phosphor with emission peak around 490 nm and absorption band in the near-ultraviolet range of 380–420 nm. Herein, a highly efficient cyan-emitting Ca 2 GdHf 2 (AlO 4 ) 3 :Ce 3+ (CGHA:Ce 3+ ) garnet phosphor with internal quantum efficiency as great as 80% is reported. Impressively, the CGHA:1%Ce 3+ sample showed a broad excitation band ranging from 350 to 470 nm with a maximum at 408 nm, and upon 408 nm excitation it exhibited an intense broad cyan emission band in the 420–700 nm wavelength range with peak at 489 nm and a full width at half-maximum of 103 nm. Importantly, by applying the newly discovered cyan-emitting CGHA:1%Ce 3+ phosphors as color converter, the CRI value of the fabricated warm-white LED device is greatly enhanced from 80.5 to 91.6. This work demonstrates that the novel developed CGHA:Ce 3+ cyan phosphors could compensate for the cyan gap and realize full-visible-spectrum lighting, which have a bright prospect in high-quality solid-state white lighting.
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ACS Sustainable Chemistry & Engineering
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2020
·
IF 7.632
Heng Liu,Qiulin Li,Bing-Huan Zhang,Long-Cheng Zhang,Guo-Rong Hou,Maowen Xu,Shu-Juan Bao
Fe–N–C catalysts exhibit promising activity toward the catalytic oxygen reduction reaction (ORR). However, applicability of such catalysts is limited by serious oxidative corrosion via the Fenton reaction. In this feature work, we prepared manganese–nitrogen species by pyrolyzing a bimetal CdMn and P-phenylenediamine organic complex (CdMn–PPD) under different atmospheres for the first time. The experimental results suggest that the carbonized atmosphere deeply affects the graphitization degree, pore structure of carbon, and the formation of Mn–N active sites. Of the three prepared catalysts, Mn@NPC–NH3 exhibited the greatest Mn–N and pyridinic N content and delivered excellent ORR activity (Eonset: 0.95 V, E1/2: 0.83 V). Even more impressive, the Fenton reaction was substantially restrained by this catalyst. Overall, the Mn@NPC–NH3 offers superior stability to that of Fe–N–C catalysts, providing new insight for further explorations of excellent non-noble metal ORR catalysts.
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BIOMATERIALS
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2020
·
IF 10.317
Kaiyuan Wang,Hao Ye,Xuanbo Zhang,Xia Wang,Bin Yang,Cong Luo,Zhiqiang Zhao,Jian Zhao,Qi Lu,Haotian Zhang,Qiming Kan,Yongjun Wang,Zhonggui He,Jin Sun
Metastasis is closely associated with high breast cancer mortality. Although nanotechnology-based anti-metastatic treatments have developed rapidly, the anti-metastasis efficiency is still far from satisfactory, mainly due to the poor recognition of circulating tumor cells (CTCs) in blood. Herein, we developed an exosome-like sequential-bioactivating prodrug nanoplatform (EMPCs) to overcome the obstacle. Specifically, the reactive oxygen species (ROS)-responsive thioether-linked paclitaxel-linoleic acid conjugates (PTX-S-LA) and cucurbitacin B (CuB) are co-encapsulated into polymeric micelles , and the nanoparticles are further decorated with exosome membrane (EM). The resulting EMPCs could specifically capture and neutralize CTCs during blood circulation through the high-affinity interaction between cancer cell membrane and homotypic EM. Following cellular uptake, EMPCs first release CuB, remarkably blocking tumor metastasis via downregulation of the FAK/MMP signaling pathway . Moreover, CuB obviously elevates the intracellular oxidative level to induce a sequential bioactivation of ROS-responsive PTX-S-LA. In vitro and in vivo results demonstrate that EMPCs not only exhibit amplified prodrug bioactivation, prolonged blood circulation, selective targeting of homotypic tumor cells, and enhanced tumor penetration, but also suppress tumor metastasis through CTCs clearance and FAK/MMP signaling pathway regulation. This study proposes an integrated approach for mechanism-based inhibition of tumor metastasis and manifests a promising potential of programmable-bioactivating prodrug nanoplatform for cancer metastasis inhibition .
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PubMed
高影响因子
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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CATALYSIS LETTERS
·
2019
·Vol. 150
·期 4
·1121-1127
·
IF 2.372
Xu Siquan,Wu Ningxin,Yuan Hui,Chen Yuan,Pan Donghui,Wu Yuanfeng,Fan Jingdeng,Gao Lijing,Xiao Guomin
Abstract Silica-supported hafinum phosphide (HfP/SiO 2 ) was prepared and applied as an effective solid acid catalyst to drive furfural production from xylan. Various characterizations were employed to analyze the intrinsic properties of the HfP/SiO 2 catalyst, and the effects of process parameters on its performance were investigated in detail. The results showed that the performance of the HfP/SiO 2 catalyst was excellent, which allowed up to 85% of the furfural yield to be achieved at 180 °C for 60 min in the water (NaCl) /THF biphasic system. There was no significant decrease in the performance of the HfP/SiO 2 catalyst after seven consecutive cycles. Characterization analysis of the recovered catalyst revealed that its elemental composition and total acidity were maintained, indicating the desired hydrothermal stability of the HfP/SiO 2 catalyst. In addition, by-products produced during xylan conversion were identified as humins and soluble molecular fragments or polymers. Graphic Abstract
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ChemCatChem
·
2019
·Vol. 12
·期 2
·642-648
·
IF 4.495
Gang Yuan,Chan Wu,Guorong Zeng,Xiaopo Niu,Guoqiang Shen,Li Wang,Xiangwen Zhang,Rafael Luque,Qingfa Wang
Graphical Harvest from inexhaustible nature : Intermittent renewable electricity can be stored in chemical bonds by atomic economy production of fuels and chemicals from the aqueous solution of biomass over efficient and stable nanoscale electrodes. Electrochemical valorization of non-food biomass-derived carboxylates into fuels is promising for the conversion, storage, and distribution of renewable electricity. Herein, we demonstrate that biofuels, hydrogen, and bicarbonate can be simultaneously produced in an electrochemical cell by one-step electrolysis of free fatty acids under ambient conditions on 3D self-supported ultralow Pt loading (2 wt %) electrode. The three valuable products can naturally separate from each other during the electrolysis in the alkaline aqueous solution. The experimental suggests that Pt(100) and Pt(110) are favorable for the production of non-Kolbe and Kolbe hydrocarbons, respectively. DFT calculation further clarifies the adsorption and stabilization of the reaction intermediates on Pt(100) and Pt(110).
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