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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JOURNAL OF ALLOYS AND COMPOUNDS
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2021
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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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NEW JOURNAL OF CHEMISTRY
·
2023
·
IF 3.3
Ming Gao,Chang Bian,Hongjie Zhao,Huili Wang,Xuedong Wang
p-aminophenol nitrophenol (p-AP) is widespread in various aquatic environments with teratogenic effects, nephrotoxicity, and genotoxicity. Hence, developing a quick, sensitive, and focused approach for p-AP detection is crucial. In this study, monodisperse, evenly dispersed fluorescent sulfur quantum dots (SQDs) with a 5 - 10 nm size were produced via the "assembly-fission" technique. Tyrosinase (Tyr) catalyzes the oxidation of p-AP to 4-amino-1, 2-benzoquinone, which efficiently quenches the fluorescence of SQDs through the internal filtering effect (IFE) between the oxidative product and SQDs. The quenching mechanism of the SQDs/Tyr/p-AP system is demonstrated by analyzing fluorescence, Zeta potential, and UV-Vis absorption spectrum overlap. When the concentration of p-AP is between 0.5 and 120 μM in the presence of Tyr, the fluorescence quenching efficiency of SQDs exhibits a strong linear relationship. The limit of detection is 0.15 μM, which is comparable to most other methods, and also shows a wider linear range with less matrix interference. With outstanding recoveries of 93.2 ~ 105.8% and relative standard deviations (RSDs) of 1.8 ~ 3.7% and 3.6 ~ 6.6%, respectively, the newly proposed approach has been effectively used to detect p-AP in a variety of waters. Overall, this proposed method is having high recoveries and low detection limits for the great potential application of actual determination of p-AP in different waters.
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INORGANICA CHIMICA ACTA
·
2023
·
IF 2.8
Qiu Lv,Qing Lin Guan,Xiao Yu Tang,Jing Jin,Feng Ying Bai,Yong Heng Xing
Nitrogen heterocyclic polycarboxylic acid is a type of ligands with excellent coordination ability and rich conformations. Two metal complexes, ([Co 2 (L 1 ) 2 (CH 3 COO)(H 2 O) 3 ]‧(CH 3 COO)‧H 2 O ( 1 ) (HL 1 = 4-[2,6-bis(pyrazin-2-yl) pyrid-4-yl]benzoic acid)) and (Cu 2 (L 2 )(H 2 O) ( 2 ) (H 4 L 2 = 5-[6-(3,5-dicarboxy phenylamino)pyrid-2-ylamino]benzene-1,3-dicarboxylic acid)) were synthesized with transition metal salts and nitrogen heterocycle polycarboxylic acid ligands by solvothermal method. Both complexes were characterized by infrared and ultraviolet spectroscopy, powder X-ray diffraction analysis, and thermogravimetric analysis. The X-ray single crystal structural analysis shows that complex 1 is a one-dimensional double-chain supramolecular structure built by intermolecular hydrogen bonds. While complex 2 is a three-dimensional framework with multiple channels, where the two independent Cu(II) metals are five-coordinated to form a square pyramidal coordination geometry. In addition, in order to investigate the functional properties of the two complexes, catalytic reduction experiments towards p-nitrophenol were carried out preliminarily. The reduction efficiency above 96 % demonstrates their potential as catalysts.
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SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
·
2026
·
IF 4.8
Weiting Zhao,Xue Zhang,Yunsheng Shang,Qianxia Wang,Xuemei Wang,Lu-Lu Qu,Guohai Yang,Yingqiu Gu
A Raman-microfluidic sensor was developed for perfluorooctanoic acid detection. • Au/TiO 2 nanocomposite substrate significantly amplifies Raman signals. • The detection probe enables specific recognition of perfluorooctanoic acid. • The sensor achieves a low detection limit of 2.57 × 10 −8 M. Per - and polyfluoroalkyl substances (PFAS) are widely employed in diverse industrial applications owing to their exceptional stain resistance, thermal stability, mechanical durability, and intrinsic non-biodegradable nature. Among this class of compounds, perfluorooctanoic acid (PFOA) stands as a representative and extensively investigated PFAS congener. However, given the high toxicity of PFOA and its severe adverse effects such as carcinogenicity, hepatic injury and immune dysfunction, the highly sensitive detection of PFOA is of vital importance. In this study, a microfluidic device for the highly sensitive detection of PFOA was fabricated using self-assembled p -phenylenediamine nanoparticles (SAp-PD) and an Au/TiO 2 substrate. The device consists of two key parts: an Au/TiO 2 -based signal amplification system (spherical hollow mesoporous TiO 2 modified with Au NPs, immobilized on a silicon wafer to enhance surface-enhanced Raman scattering (SERS) signals) and a SAp-PD-based detection mechanism (PFOA disrupts SAp-PD's self-assembled structure, reducing its Raman intensity). The method achieved a low limit of detection (LOD) of 2.57 × 10 −8 M. Real sample detection successfully identified PFOA in fire-retardant fabrics, demonstrating the device's potential for quantitative PFOA detection in real environments and providing a practical approach. A Surface-Enhanced Raman Scattering-microfluidic device was constructed for ultrahigh-sensitivity detection and identification of perfluorooctanoic acid in real flame-retardant fabric samples. Download: Download high-res image (191KB) Download: Download full-size image
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2023
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IF 9.9
Xiaoyun Zhang,Fan Yang,Siyuan Sun,Kexin Wei,Hongchen Liu,Guohua Li,Yang Sun,Xi Li,Jinxiu Qian,Shaoxiong Du,Mingjie Li,Yi Lu,Chuangui Xia,Sai Che,Yongfeng Li
An electrocatalyst of single-atomic Mn sites with MnP nanoparticles (NPs) on N, P co-doped carbon substrate was constructed to enhance the catalytic activity of oxygen reduction reaction (ORR) through one-pot in situ doping-phosphatization strategy. The optimized MnSA-MnP-980℃ catalyst exhibits an excellent ORR activity in KOH electrolyte with a half-wave potential (E 1/2 ) of 0.88 V (vs. RHE), and the ORR current density of MnSA-MnP-980℃ maintained 97.9 % for over 25000 s chronoamperometric i-t measurement. When using as the cathode, the MnSA-MnP-980℃ displays a peak power density of 51 mW cm −2 in Zinc-Air batteries, which observably outperformed commercial Pt/C (20 wt%). The X-ray photoelectron spectroscopy reveal that the doped P atoms with a strong electron-donating effectively enhances electron cloud density of Mn SAs sites, facilitating the adsorption of O 2 molecules. Meanwhile, the introduction of MnP NPs can regulate the electronic structure of Mn SAs sites, making Mn SAs active sites exist in a low oxidation state and are less positively charged, which can supply electrons for ORR process to narrow the adsorption energy barrier of ORR intermediates. This work constructs novel active sites with excellent ORR properties and provides valuable reference for the development of practical application.
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PubMed
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ACS Sustainable Chemistry & Engineering
·
2023
·
IF 8.4
Zhenpu Shi,Juhong Xu,Yujiao Wang,Yudong Pang,Wanli Zhao,Hongyun Yue,Zongxian Yang,Shu-Ting Yang,Yanhong Yin
Lithium polysulfides (LiPSs) shuttling effect is the main problem to be solved for cathode materials of lithium–sulfur batteries. The adsorption and catalytic conversion of LiPSs by host materials have become the main focus of cathode materials. In this work, transition metal phosphides are combined with three-dimensional carbon nanosheets to form an efficient and stable sulfur host material. The designed composite material is effective in solving the problems of slow reaction kinetics of Li–S batteries and LiPSs shuttling. Here, through the supramolecular self-assembly process of melamine and phytic acid, combined with soluble salt template technology, N- and P-codoped three-dimensional hierarchical porous carbon materials with uniformly dispersed CoP nanoparticles were efficiently synthesized. The catalytic effect of CoP nanoparticles improves the reaction kinetics effectively of LiPS conversion. The strong polarity of CoP nanoparticles is beneficial to the adsorption of polysulfide ions. Moreover, the high specific area provides more LiPS adsorption sites, and the doping of N and P heteroatoms further increases the active sites of the composites. The experimental results and theoretical calculations show that the introduction of CoP promotes the conversion of LiPSs and accelerates the nucleation rate of Li2S, thereby improving the electrochemical performance of the composite as a sulfur host for lithium–sulfur batteries.
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JOURNAL OF APPLIED POLYMER SCIENCE
·
2023
·Vol. 141
·期 4
·e54842
·
IF 3
Junwei Li,Qiuju Ma,Quanyi Liu,Penglun Zheng
To further enhance the fire safety of epoxy resins, a phosphorus–nitrogen synergistic flame retardant (DPVHD) with a flexible chain segment and a nitrile group was synthesized. In addition to the traditional flame retardant elements P and N, the flame retardancy of the epoxy composites is further enhanced by the cross-linking effect of the nitrile groups introduced to form an interpenetrating network with the epoxy matrix. The results showed that the sample with 10 wt% DPVHD-10/EP had a LOI of 32.3% and passed the UL-94 V-0 rating, with PHRR and THR reduced by 15.4% and 47%, respectively, compared to pure EP. It is worth noting that the introduction of flexible chain segments improves the flexural properties of the epoxy resin matrix. Compared with pure epoxy, the flexural properties of epoxy-cured compounds with DPVHD addition show a rising trend with the increase of flame-retardant additive. And the rise of DPVHD-10/EP reaches 33.6%, which greatly reduces the negative effect of flame-retardant additives on the mechanical properties of the epoxy resin matrix. This work therefore provides new ideas for exploiting the advantages of phosphorus-nitrogen synergy and nitrile-based cross-linking for flame retardancy in epoxy resins.
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APPLIED CATALYSIS B-ENVIRONMENTAL
·
2023
·
IF 22.1
Xinlei Zhang,Fei Wu,Guicun Li,Lei Wang,Jianfeng Huang,Alan Meng,Zhenjiang Li
Photocatalytic water splitting is a prospective approach to address the energy and environmental challenges. Herein, an amorphous Ni@NiS x cocatalyst has been fabricated and simultaneously assembled onto CdS to form amorphous-crystalline Ni@NiS x -CdS photocatalyst via a partial reduction strategy. Comprehensive experiments and theoretical calculations demonstrate that the synergistic effects between the electronic coupling of amorphous-crystalline interface and the gradient work function variation induced by Ni nanocluster encapsulation achieve the deeper downshift of the S p-band center to optimize H* intermediate adsorption, enhance charge extraction ability though Schottky junction and lower H* adsorption Gibbs free energy (ΔG H* ). Accordingly, the optimal Ni@NiS x -CdS photocatalyst delivers a remarkable photocatalytic H 2 production rate of 78.7 mmol·g −1 ·h −1 with an apparent quantum efficiency (AQE) of 36.74% at 420 nm, which is approximately 18.3 and 1.5 times than that of CdS and NiS x -CdS, respectively. This work offers a novel insight into the development of amorphous nanocomposite cocatalysts for promoting solar-to-H 2 energy conversion.
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SEPARATION AND PURIFICATION TECHNOLOGY
·
2021
·
IF 7.312
Yingying You,Haiguang Yuan,Yixiao Wu,Yiyang Ma,Chenchen Meng,Xuesong Zhao
Using solar energy to reduce bromate in drinking water is promising. Unfortunately, most effective photocatalysts for bromate conversion are metal-based semiconductors. Here, for the first time, metal-free hybrid composites made of red phosphorus and perylene diimide (RP/PDI) were successfully designed and constructed, and their excellent catalytic performance for removing bromate under visible light was demonstrated. Characterizations such as XRD, FTIR, Raman, SEM and XPS confirmed the successful preparation of the hybrid catalyst, and the impact of water matrices suggests that it can be used for the actual treatment of bromate. The bromate reduction rate of the prepared RP/PDI-2 was 4.2 times and 7.0 times faster than pure RP and PDI, respectively. As evidenced by EIS and EPR results, this improvement is mainly due to the formation of p-n heterojunctions , which enhanced the separation of charge carriers and inhibited the production of active species ( O 2 − and OH) with strong oxidative capabilities. Considered holistically, the current study provides not only a metal-free photocatalyst with good photoreduction performance, but also some guidance for the rational design of hybrid photocatalyst in the treatment of aqueous bromate.
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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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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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