JOURNAL OF ALLOYS AND COMPOUNDS
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2021
·
IF 5.316
Hai Yu,Miao Zhang,Jianguo Lv,Yanfen Wang,Lei Yang,Yanmei Liu,Qian Gao,Gang He,Zhaoqi Sun
In this study, we fabricated TiO 2 nanorod arrays (TiO 2 ), which were decorated with AgVO 3 quantum dots (QDs) on and a layer of V 2 O 5 film, forming a heterojunction material for removal pollutants and photoelectrochemical (PEC) water splitting. The AgVO 3 /V 2 O 5 -TiO 2 nanorod arrays (AgVO 3 /V 2 O 5 -TiO 2 ) synthesized by the secondary hydrothermal method were grown on conductive glass to form one-dimensional (1D) nanorod and p-n junction structures. Through experimental characterisation and testing, optical, morphological photocatalysis and PEC characteristics of the materials were measured and studied. The TiO 2 modified with AgVO 3 and V 2 O 5 can significantly improve the visible light optical absorption, the reduce the electron-hole pair binding rate and shorten the band gap (3.07–1.41 eV) of TiO 2 . The resulting photocurrent density (116 uA/cm 2 ) and photodegradation efficiency (rate constant, k = 0.025 min −1 ) of AgVO 3 /V 2 O 5 -TiO 2 are approximately 20 (6 uA/cm 2 ) and 5 times (0.005 min −1 ) higher than those of bare TiO 2 , respectively. The AgVO 3 /V 2 O 5 -TiO 2 achieved a current density of 10 mA at an overpotential of 246.2 mV and exhibited excellent oxygen evolution reaction (OER) performance. The systematic PEC experiments concluded that the optimized of the TiO 2 interface by AgVO 3 and V 2 O 5 could promote the separation and transport of charge carriers.
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CERAMICS INTERNATIONAL
·
2021
·
IF 4.527
Tianxing Gong,Tingyu Li,Lisha Meng,Yadong Chen,Tao Wu,Jingqiu Zhou,Guoxiu Lu,Zhiguo Wang
Native bone is piezoelectric in nature and generates abundant surface charges under mechanical compression, which regulate osteoblast proliferation, differentiation, adhesion, and so on. Poly (vinylidene fluoride) (PVDF) is becoming one of the most popular piezoelectric polymers because of its easy processability and good biocompatibility. Unfortunately, because only the β and γ crystal phases of PVDF have piezoelectricity, post-treatments, for example, polarizing at high temperature, are required to enhance the piezoelectricity of PVDF scaffolds after fabrication. In this study, we reported a phase-separation-hydration method to fabricate a calcium phosphate silicate (CPS)-doped PVDF scaffold. Our method fabricated a better piezoelectric scaffold than native bone without further processing (∼ 3 pC/N vs. 0.7 pC/N). In addition, the scaffold was mechanically compatible (∼ 7 MPa) with the cancellous bone with sufficient porosity (∼ 45%) to facilitate osteoblast infiltration and bone ingrowth. The in vitro biocompatibility analyses proved that the prepared CPS-PVDF scaffold was biocompatible with osteoblast cells and encouraged osteoblast redifferentiation. In conclusion, our results suggest that this CPS-PVDF scaffold is a promising candidate for bone tissue engineering applications.
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WASTE MANAGEMENT
·
2021
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IF 7.145
Zishang Tian,Xiaojie Shao,Jiaojiao Zhang,Lijuan Su,Yingxiong Wang,Tiansheng Deng,Yuqi Wang,Xianglin Hou
Poly-p-phenylene terephthamide (PPTA) is widely applied in bulletproof products and composite materials because of its high strength, high modulus, high temperature resistance and creep resistance. The PPTA molecule with highly symmetrical and regular structure is linear structure formed by the alternating connection of benzene ring and amide bond, and the amide bonds between the molecular chains form strong hydrogen bonds. Therefore, the dissolution and depolymerization of PPTA is very challenging. In this work, an efficient catalytic system was developed for the controllable degradation of waste PPTA, and the high-value added monomers terephthalic acid (TPA) and p-phenylenediamine (PPD) were recovered. The results show that the amide bonds of PPTA can be selectively cleaved by the strong Brönsted base catalysts in alcohols, especially in the NaOH/ n -butanol system. Under the optimal degradation conditions (5 wt% NaOH in n -butanol, 180 °C, 6 h), the percentage degradation of PPTA is 100%, and the yields of TPA and PPD are 92.0% and 91.5%, respectively. In addition, it is found that the wettability of n -alcohols on PPTA monofilament and the addition of a small amount of water have important influences on the degradation of PPTA. The work elucidates the degradation mechanism of PPTA, and reveals the important factors affecting the depolymerization of PPTA.
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高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2021
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IF 8.128
Shenghe Zhang,Fukai Chu,Zhoumei Xu,Yifan Zhou,Yong Qiu,Lijun Qian,Yuan Hu,Bibo Wang,Weizhao Hu
Herein, three different phosphorus-containing compounds (methyl phosphoryl dichloride, phenyl phosphoryl dichloride and phenyl dichlorophosphate) were reacted with 2-aminobenzothiazole respectively, and a series of synergistic flame retardants with phosphorus, nitrogen and sulfur elements were synthesized, named MPBT, PPBT and POBT respectively. Then, they were added to prepare flame-retardant flexible polyurethane foam (FPUF). Through the analysis of thermal stability, pyrolysis, heat release and smoke release behavior, the influence of different phosphorus-containing structures on the flame-retardant performance of FPUF was studied, and their flame-retardant mechanism was explored in detail. Among them, MPBT had the highest flame retardant efficiency with the same addition amount (10 wt%). The limiting oxygen index (LOI) value of PU/10.0% MPBT reached 22.5 %, and it successfully passed the vertical burning test. Subsequently, the addition amount of MPBT was increased and the best comprehensive performance of flame-retardant FPUF was explored. The results showed that the LOI value of PU/15.0% MPBT was increased to 23.5%. As for PU/15.0% MPBT, the peak heat release rate (PHRR) was 453 KW/m 2 , which was reduced by 46.64 %; and the flame retardancy index (FRI) value was also increased to 6.88. At the same time, the mechanical properties of flame-retardant FPUF were studied. The tensile strength of PU/15.0% MPBT reached 170 KPa, and the permanent deformation of FPUF/10% MPBT was only 4 %, showing its excellent resilience. The above results show that this phosphorus-containing element hybrid synergistic flame retardant (MPBT) has a very good application prospect in the field of flame-retardant polymer materials.
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高影响因子
Journal of Materials Chemistry A
·
2021
·Vol. 9
·期 46
·26010-26018
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IF 12.732
Junhao Jiang,Jinpeng Li,Jun Qian,Xiaoyun Liu,Peiyuan Zuo,You Yuan,Qixin Zhuang
Polymer nanocomposites with high energy density have become a research hotspot in the field of dielectric materials. However, the huge compatibility contrast between nanofillers and polymers always hinders the further improvement of dielectric properties. Meanwhile, next-generation dielectrics should possess excellent thermal stability to cope with the development of high-temperature applications. Herein, a novel polymer nanocomposite based on heat-resistant poly(p-phenylene benzobisoxazole) (PBO) and high-permittivity CaCu3Ti4O12 (CCTO) nanoparticles was prepared by the solution method. In this process, electroactive polymer poly(2-isopropenylbenzoxazole) (P(2-IBO)), which has a chemical structure similar to PBO and contains numerous permanent dipoles, is selected as the modifier to optimize the electric field behavior at the interface, and it is coated on the surface of CCTO nanoparticles via surface-initiated reversible addition–fragmentation chain transfer (RAFT) polymerization for achieving controllable dielectric properties. The results demonstrate that the dielectric properties can be adjusted by changing the thickness of the P(2-IBO) shell. The breakdown strength and energy density of the modified CCTO/PBO nanocomposites are much higher than those of the unmodified CCTO/PBO nanocomposites. Under an electric field of 200 kV mm−1, the maximum discharge energy density reaches 3 J cm−3, which is about 500% that of pure PBO (0.6 J cm−3). Moreover, the dielectric properties are nearly independent of the testing temperature (25 to 200 °C), indicating that this nanocomposite is an ideal candidate for high-temperature dielectric materials.
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RSC Advances
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2021
·Vol. 11
·期 60
·38003-38015
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IF 3.361
Mengdi Tang,Yonggang Zhang
Degradation of nonbiodegradable organic compounds into harmless substances is one of the main challenges in environmental protection. Electrically-activated persulfate process has served as an efficient advanced oxidation process (AOP) to degrade organic compounds. In this study, we synthesized three nitrogen-doped carbon materials, namely, nitrogen-doped activated carbon plus graphene (NC), and nitrogen-doped activated carbon (NAC), nitrogen-doped graphene (NGE), and three nitrogen-doped carbon material-graphite felt (GF) cathodes. The three nitrogen-doped carbon materials (NC, NGE, NAC) were characterized using X-ray diffraction, Raman spectroscopy, X-ray electron spectroscopy, and nitrogen desorption–adsorption. The electron spin resonance technique was used to identify the presence of hydroxyl radicals (˙OH), sulfate radicals (SO4˙−) and singlet oxygen (1O2) species. The results showed that NC was more conducive for the production of free radicals. In addition, we applied NC-GF to an electro-activated persulfate system with the degradation of p-nitrophenol and investigated its performance for contaminant degradation under different conditions. In general, the nitrogen-doped carbon electrode electro-activated persulfate process is a promising way to treat organic pollutants in wastewater.
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ACS Applied Energy Materials
·
2021
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IF 6.024
Tuo Zhao,Chuan Long,Zhiqian Wang,Hong Zhu
As a key component of anion exchange membrane fuel cells (AEMFCs), anion exchange membranes (AEMs) have been investigated in the last decades. Herein, a series of multication cross-linkers were introduced into side-chain-type poly(p-terphenyl isatin) to develop high-performance and long-term stable AEMs. Additionally, the effects of the hydrophilic cross-linker length on the membrane performance were systematically investigated. The resulting cross-linked membranes possess a low swelling ratio (<18% at 80 °C) and high tensile strength (51.1–58.3 MPa). Notably, the cross-linker length influences the AEM internal morphology. With hexyl as the spacer between backbones and cation groups in the cross-linker, 0.9q-PTI-6C exhibits the highest hydroxide ion conductivity of 118.5 mS/cm at 80 °C, which is ascribed to well-developed ion channels. Furthermore, alkyl spacer chains and cross-linked networks contribute to the excellent alkali stability of membranes. After immersion in 2 M NaOH for 1200 h at 80 °C, 0.9q-PTI-8C only shows 11 and 12.7% losses in ion conductivity and ion exchange capacity (IEC), respectively. The fuel cell fabricated using 0.9q-PTI-6C can achieve the maximum power density of 310 mW/cm2 at 80 °C.
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RSC Advances
·
2021
·Vol. 11
·期 43
·26502-26508
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IF 3.361
Meirong Fu,Mingqiang Li,Yingying Zhao,Yunxiang Bai,Xingzhong Fang,Xiaolong Kang,Min Yang,Yanping Wei,Xia Xu
Precious metal nanometric catalysts are widely used in the removal of harmful substances. In the process of synthesis and catalytic reaction, it is particularly important to study green and simple synthesis methods and high catalytic efficiency. In this paper, a green one-step method was used to synthesize the Fe(OH)3/Fe2O3@Au composite catalyst, in which Au was single atom-dispersed. The removal of 4-nitrophenol (4-NP), a typical dangerous chemical widely existing in factory waste gas, waste water and automobile exhaust gas, was catalysed by Fe(OH)3/Fe2O3@Au. The catalytic performance of Fe(OH)3/Fe2O3@Au with different synthesis conditions (different amounts of MES, NaBH4, FeSO4, Au and Pt) on the 4-NP reduction reaction were systematically studied. Finally, the stability and recyclability of Fe(OH)3/Fe2O3@Au composite nanocatalyst were investigated thoroughly.
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高影响因子
Nanoscale Advances
·
2021
·Vol. 3
·期 16
·4851-4857
·
IF 4.553
Xiaoli Yang,Shaodong Sun,Jie Cui,Man Yang,Qing Yang,Peng Xiao,Shuhua Liang
Heterojunction engineering is an effective strategy to enhance the photodegradation activity via improving the spatial charge separation. However, the poor interface interactions and stability limit the photocatalytic activity and stability of traditional heterojunctions. Herein, robust BiOCl/ZnO p–n heterojunctions with semi-coherent interfaces were prepared by a one-pot hydrothermal method to improve the activity and stability toward photocatalytic degradation than that of the counterpart, in which the semi-coherent interfaces exhibited lower phase boundary energy, resulting in highly-stable interfaces between BiOCl and ZnO as well as the formation of the built-in electric field in this robust p–n heterojunction for enhanced charge separation. The cycle test results verified that the BiOCl/ZnO heterojunctions with semi-coherent interfaces can maintain the photocatalytic degradation activity at the initial level even after 10 cycles, while deactivation of the sample without semi-coherent interfaces occurred after 3 cycles only. Optical and electrical properties revealed that BiOCl/ZnO heterojunctions with semi-coherent interfaces possessed the highest electron migration and charge separation efficiency, resulting in the highest photodegradation activity. Density functional theory (DFT) calculations and electron spin-resonance (ESR) results verified that the enhanced charge separation was assigned to the type-II photocatalytic mechanism, leading to the enhancement of ˙OH and ˙O2− reactive oxygen species. This work would provoke the development of one-step construction of new highly active BiOX (X = Cl, Br, and I)-based heterogeneous photocatalysts with stable semi-coherent interfaces.
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高影响因子
CERAMICS INTERNATIONAL
·
2021
·
IF 4.527
Qingming Meng,Wenna Liu,Juan Jiang,Xinle Zhang
CuO/ZnO p-n heterojunction nanofibers were fabricated by coupling p-type CuO with n-type ZnO nanofibers for efficacious elimination of pyridine in fuel oil. The structural and photoelectric characteristics of the as-synthesized nanofibers were systematically studied. The photodegradation system was appropriate for the oxidation of pyridine from fuel oil utilizing the ambient air without mixing with other oxidants. Under visible light illumination, more than 90% of the pyridine (100 mL, 100 μg/g) could be degraded within 60 min by 17.5 mg of MCuZn-0.5 (the photocatalyst with a Cu/Zn molar ratio of 0.5 at%). The visible-light-induced photocatalytic denitrification efficiency of the MCuZn-0.5 nanofibers was nearly 1.5 times as high as that of ZnO alone. The superior denitrification activity of p-CuO/n-ZnO heterojunction nanofibers could be attributed to the enhanced optical absorption capacity and efficacious separation of photoexcited charge pairs. In addition, five-cycle experiments confirmed that MCuZn-0.5 nanofibers also displayed satisfactory photocatalytic denitrification properties. Mechanistic investigations proposed that the photoexcited holes played a dominant role in the formation of reactant intermediates, while superoxide radicals promoted the ultimate mineralization process of pyridine.
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INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2021
·
IF 5.816
Bin Qu,Ye Tao,Lan Yang,Yihui Liu
Transition metal phosphide based orange-like Pd@Co@P nanoparticles supported on reduced graphene oxide (Pd@Co@P/rGO) have been synthesized by a one-pot co-reduction at room temperature using methylamine borane (MeAB) as the reducing agent. The prepared Pd@Co@P/rGO nanoparticles were characterized by powder X-ray diffraction (XRD), transmission electron microscope (TEM), X-ray photoelectron spectroscopy (XPS), Fourier transform infrared spectroscopy (FT-IR), selected area electron diffraction (SAED) and confocal Raman microscopy (Raman). Compared with Pd/rGO and Pd@Co/rGO, the Pd@Co@P/rGO catalyst has higher catalytic activity for the hydrolytic production of ammonia borane (AB) with the turnover frequency value (TOF) of 127.57 min −1 and the activation energy of 39.05 kJ mol −1 . This excellent catalytic performance may be caused by the orange-like structure and good dispersion of Pd@Co@P/rGO nanoparticles, and the synergistic electron interactions between palladium , cobalt, and phosphorus.
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ANALYTICA CHIMICA ACTA
·
2021
·
IF 6.558
Meiyan Zhu,Xiaotong Dong,Ming Li,Liangbin Jia,Ye Ma,Minggang Zhao,Hongzhi Cui
Detection of pollutants in seawater faces a great challenge of strong interference, and the facile detection method is lacked. The CoMn 2 O 4 /β-MnO 2 p-n junction oxidase mimetics were successfully prepared for colorimetric detection of hydroquinone in seawater. The catalysis ability was enhanced significantly by the photo-induced p-n junction interface effect. It not only promoted the formation of H 2 O 2 by suppressing the recombination of photon-generated carriers, but also provided the driving force for electron transport . The colorimetric detection of hydroquinone was achieved by fading and exhibited good adaptability in seawater. The obtained good recovery rate (97.23%–101.37%) in seawater makes it an inspiring method for practical application. The photo-induced p-n junction interface effect provides an opportunity for developing the application of colorimetric sensing in seawater detection.
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