DYES AND PIGMENTS
·
2020
·
IF 4.613
Sujie Han,Xipao Chen,Yaoping Hu,Lei Han
As a newly discovered photoluminescent material, carbon dots (CDs) have shown promising performance in many fields. However, due to aggregation-caused fluorescence quenching, most of CDs are poorly emissive in the solid state, which severely restricts their wide applications, especially in the optoelectronic devices . To overcome this problem, herein, we design a novel kind of self-quenching-resistant N , P -doped CDs, using polyethyleneimine (PEI), phosphoric acid , and ethanol as raw ingredients. The as-synthesized CDs are amorphous and contain abundant surface PEI chains which properly separate the individual carbon core and prevent the direct π–π interaction. Such a unique structure conquers self-quenching during aggregation, and gives CDs a bright blue fluorescence in solid state without any other additional matrices. By taking advantage of their excellent optical properties , the CD powers, combined with red emissive europium metal-organic frameworks, are successfully employed as hybrid phosphors for construction of white light-emitting diodes exhibiting a Commission Internationale de L'Eclairage (CIE) coordinate of (0.33, 0.33).
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MICROPOROUS AND MESOPOROUS MATERIALS
·
2020
·
IF 4.551
Yu-Hua Wu,Kai Xue,Qiao-Ling Ma,Ting Ma,Yu-Long Ma,Yong-Gang Sun,Wen-Xin Ji
As the bulk of solid waste from coal chemical industry, coal gasification fine slag (CGFS) mainly consists of aluminosilicates and residual carbon. Currently, the common transformation strategy for CGFS entails the preparation of porous materials. However, this method utilizes only a part of the effective components in the slag. Specifically, either the silicon is used to synthesize zeolites , or the porous carbon is obtained through intensified separation. Therefore, it is highly desirable to achieve the simultaneous utilization of silicon and carbon resources in CGFS. In this work, CGFS was used as a low-cost raw material to prepare the P-zeolite/carbon composite in situ. The composite was characterized via XRD , 27 Al and 29 Si NMR, SEM, FT-IR, and Raman technique. Furthermore, the adsorption removal of crystal violet onto the composite was studied. The adsorption capacity was as high as 625.00 mg g −1 , which was much larger than the CGFS and most reported adsorbents.
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高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2020
·Vol. 137
·期 37
·49090
·
IF 2.52
Jianwen Cheng,Huajun Duan,Shuang Yang,Jun Wang,Qianqian Zhang,Guoping Ding,Yefa Hu,Siqi Huo
A P/N-containing flame retardant (PPT) constructed by phosphaphenanthrene, phosphonate, and triazole groups was successfully synthesized and used as a reactive co-curing agent for epoxy resin (EP). The curing behavior, thermal property, combustion behavior, and flame retardant mechanism of EP thermosets were comprehensively investigated. According to the analysis of DSC and TGA, PPT accelerated the crosslinking reaction and enhanced the charring ability for EP thermosets at high temperature. The results of combustion test indicated that PPT endowed epoxy thermoset with outstanding flame retardancy. When the phosphorus content was 0.71 wt%, EP/DDS/PPT-2 achieved a LOI value of 33.2% and passed V-0 rating in UL-94 test, and its peak heat release rate and total heat release were decreased by 63.7 and 30.5%, respectively, relative to EP/DDS. Moreover, the FIGRA of EP/DDS/PPT-2 was reduced from 9.7 to 3.5 kW m −2 s −1 , manifesting the significantly improved fire safety of EP thermoset. The flame retardant mechanism was summarized as two parts: (a) the barrier effect of continuous phosphorus-rich char layers in condensed phase, (b) the quenching effect of phosphorous radicals and diluting effect of nonflammable gases in gaseous phase.
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Advanced Materials Interfaces
·
2020
·Vol. 7
·期 7
·1901933
·
IF 4.948
Qianfang Tang,Min Zhong,Hao Liu,Xiangying Chen,Zhongjie Zhang,Shuanghong Chen
In present work, commercial microporous carbon materials are modified on the surface with phosphorus/oxygen species by using phytic acid as sole dopant, which plays crucial effect on the carbon structure, wettability, electrical conductivity, and capacitive behaviors. It reveals that with increasing the content of heteroatoms, the porosity and contact angle are decreased but the conductivity turns much larger. Furthermore, p- aminophenol is introduced to serve as redox additive, which can produce more active surface sites by forming hydrogen bond and complexation with the surface functional groups, further providing additional pseudo-capacitance. As a result, the energy density of carbon sample by phosphorus/oxygen doping in 1 m H 2 SO 4 electrolyte with p- aminophenol is as high as 9.2 Wh kg −1 , which is 2.6 than that of pristine carbon. What is more, in terms of the simple operation and effective performance, the integration of surface modification toward carbon materials and redox additive can be favorable for largely enhancing the supercapacitor performance.
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高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2020
·
IF 3.99
Qingwen Long,Feng Liu,Yanjie Yuan,Yuting Dai,Chunli Wang,Xuheng Li,Jing Zhang
In this study, heterogeneous Fenton-like catalyst, nano-Fe° encapsulated in hydrothermal carbon (Fe°/HTCC), was prepared via a green chemistry route, aiming at increasing the degradation efficiency of p-chlorophenol (4-CP) by controlling the stability of the catalyst and Fe(III)/Fe(II) cycling in the advanced oxidation process. The degradation of 4-CP by heterogeneous Fenton reactions was conducted with the assistance of visible light, which was monitored with the aid of the HPLC and total organic carbon analysis. The results revealed that Fe°/HTCC composite markedly enhanced both the degradation (100 %) and the mineralization efficiency (∼73.9 %) for 100 mg/L 4-CP within 60 min at pH 4.0. More importantly, the catalyst presented a high stability to resist the side oxidation, where the removal efficiency was maintained even after 5 successive cycling experiments. Electron spin resonance confirmed that in the presence of both HTCC and visible light irradiation greatly enhanced the production of •OH for the degradation and mineralization of 4-CP, which can be attributed to the enhancement of Fe(III)/Fe(II) cycling. This study paves a new way toward the rational design of Fe°–carbon composites as heterogeneous Fenton-like catalysts for potential applications into wastewater treatment.
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Journal of Materials Research and Technology-JMR&T
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2020
·
IF 5.289
Yufei Liu,Siyuan Jiang,Wei Yan,Jun Qin,Min He,Shuhao Qin,Jie Yu
In order to expand its application range in electronics and membrane industries, this paper aimed to develop polyamide 6 (PA6)/P ( N -(4-carboxyphenyl) maleimide-alt-triallyl isocyanurate) (PCT) composites with heat-resisting, thermally conductive and anti-moisture, by employing PCT as a reactive reinforcement material and applying irradiation for solid-state interfacial reaction (SSIR) between PCT and PA6. According to the results, the SSIR occurred between PA6 and PCT. Compared with non-SSIR PA6, the PA6/PCT composite with SSIR showed the highest heat resistance, thermal conductivity and anti-moisture absorption and its relative crystallinity ( X c ), glass transition temperature ( T g ), and heat deflection temperature ( HDT ), thermal conductivity and anti-moisture absorption were improved by 61.4, 24.0, 83.9, 18.5 and 40.2%, respectively. This is because that the chemical bond between the PCT surface and the PA6 matrix is formed by SSIR, which provides a theoretical basis either for the development of PA6 or other semi-crystalline polymers.
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NEW JOURNAL OF CHEMISTRY
·
2019
·Vol. 44
·期 4
·1446-1454
·
IF 3.069
Jin Xiao Li,Qing Lin Guan,Yu Wang,Zi Xin You,Yong Heng Xing,Feng Ying Bai,Li Xian Sun
A facile strategy was used to construct a series of composite materials with color-tunable and white light emission by encapsulating 1,3,6,8-tetrakis(p-benzoic acid)pyrene (H4TBAPy) into framework material [Eu(MCTCA)1.5(H2O)2]·1.75H2O (Eu-MCTCA), which is synthesized based on Eu(NO3)3·6H2O and 5-methyl-1-(4-carboxylphenyl)-1H-1,2,3-triazole-4-carboxylic acid (H2MCTCA). A slight adjustment of the emission color can be easily fulfilled by simply altering the concentration of H4TBAPy or regulating the excitation wavelength. Notably, white light emitting Eu-MCTCA@H4TBAPy can be realized by encapsulating H4TBAPy with a concentration of 0.75 mM, when the excitation wavelength is 350 nm. Furthermore, based on the favorable luminescence and stable structure of Eu-MCTCA@H4TBAPy in water or organic solvents, Eu-MCTCA@H4TBAPy can be used as a potential luminescent probe for detecting Fe3+, Cr2O72− and colchicine.
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JOURNAL OF HAZARDOUS MATERIALS
·
2019
·
IF 7.65
Jiafeng Ding,Shihuan Lu,Lilai Shen,Ruopeng Yan,Yinan Zhang,Hangjun Zhang
Polychlorinated dibenzo- p -dioxins (PCDDs), characterized by their high persistency and bioaccumulation, are widely detected in the environment. In this study, high-performance g-C 3 N 4 /NiO heterojunctions were fabricated to degrade 2-chlorodibenzo- p -dioxin (2-CDD) under ultraviolet-visible (UV–vis) light illumination. Experiments revealed that the pure g-C 3 N 4 and range of g-C 3 N 4 /NiO heterojunctions were synthesized by the mixing and heating method, and then were characterized by XRD, TEM, XPS and PL etc. The composites exhibited enhanced dechlorination activities under anoxic conditions. After comparison, the g-C 3 N 4 /NiO (4:6) showed optimal dechlorination performance such that 70.4% of 2-CDD was removed within 8 h and 52.3% of 2-CDD was transformed to dibenzo- p -dioxin (DD), about fourfold higher than the pristine g-C 3 N 4 . The transformation of 2-CDD was accompanied by the resale of Cl ion, and the additional oxygen was proven to be able to consume electrons and hydrogen ions, thus greatly inhibiting the degradation of PCDD in systems. The g-C 3 N 4 /NiO (4:6) can be reused at least seven times, and the mechanism was proposed in detail to promote photoinduced electrohole separation and provide active sites. This study extends the use range of g-C 3 N 4 /NiO heterojunctions and develops a new technology to degrade PCDDs with striking activity and stability.
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PubMed
高影响因子
Materials Horizons
·
2023
·Vol. 11
·期 1
·271-282
·
IF 13.3
Peiyuan Zuo,Jinpeng Li,Donglin Chen,Lingzhi Nie,Liang Gao,Jingyu Lin,Qixin Zhuang
The all-organic high-temperature polymer dielectrics with promising scale-up potential have witnessed much progress in the energy storage area, etc. However, the electron suppression trap mechanisms behind many all-organic dielectrics are still unclear, especially for high temperature resistant poly(p-phenylene benzobisoxazole) (PBO) polymers. To resolve this tough issue, we herein innovatively prepared PBO-based all-organic thin films containing sulfone-based polyimide (P(DSDA-ODA)) functioning as an electron trap phase using a facile and scalable co-curing method. The great linear dielectric properties of the prepared P(DSDA-ODA)/PBO films hold high dielectric thermal stability over the temperature range from 25 °C to 200 °C. The 60 wt% P(DSDA-ODA) systems yield the lowest leakage current (3.8 × 10−8 A cm−2). The tight structure and reduced leakage current enable an enhanced breakdown strength of 60 wt% P(DSDA-ODA)/PBO (470 kV mm−1), which is 1.7 times that of pure PBO. Meanwhile, it can reach 4.16 J cm−3 of energy density, which is 257% higher than that for pure PBO thin films while concurrently maintaining a long stable charge–discharge cycle (at least 5000 times) and high charge–discharge efficiency at 85.10%. Moreover, P(DSDA-ODA)/PBO still exhibits excellent energy storage performance at high temperature compared to PBO. This innovative strategy is further verified by replacing P(DSDA-ODA) with P(6FDA-ODA), and therefore lays a solid foundation for more investigation on scalable all-organic dielectrics.
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高影响因子
CHEMICAL ENGINEERING JOURNAL
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2023
·
IF 15.1
Ying-Ming Li,Wen-Juan Hu,Shuang-Lin Hu,Yi-Ran Li,De-Yi Wang
Organic aerogels take the advantages of low density, regulatable flame retardancy, excellent thermal insulation and high mechanical property, which showing an innovative strategy to endow the rigid polyurethane foam with enhanced the flame retardance, mechanical property and thermal insulation performance. Hence, in this work, an innovative strategy was developed to design organic aerogels via the polyvinyl alcohol (PVA) and adenosine triphosphate endowing the RPUF with simultaneously super thermal insulation, enhanced compressive strength , flame retardancy and smoke suppression. The compressive strength of RPUF/PVA-ATP 7 composite was 338 kPa, which was 74.2% higher than that of RPUF. It should be noted that the thermal conductivity of RPUF/PVA-ATP 7 was only 0.020 W/(m·K), which being lower than that of air and showing the characteristic of supper insulating materials. For the RPUF/PVA-ATP 5 and RPUF/PVA-ATP 7 composites, both passed the UL-94V-0 rating with a LOI of 30.0% and 36.5%. Meanwhile, the peak heat release rate (PHRR) and the peak of CO production (PCOP) of RPUF/PVA-ATP 7 composites effectively reduced by 40.7% and 61.6% respectively comparing to that of RPUF. Moreover, it was concluded that the condensed phase mechanism dominated for the RPUF/PVA-ATP 7 composites.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2023
·
IF 9.9
Jiuli Chang,Fengfeng Song,Fang Xu,Dapeng Wu,Yan Hou,Kai Jiang,Yuming Guo,Zhiyong Gao
Charge redistribution across heterointerfaces is an important tactic to enhance the catalytic activities and bifunctionality of hybrid catalysts, especially for green hydrogen production from water electrolysis and harmless electrocatalytic valorization of organics. Herein, a self-supported p-n junction catalytic electrode was constructed by tandem electrodeposition of nickel cobalt phosphide (NiCoP) and nickel iron layered double hydroxide (NiFe LDH) onto Ni foam (NF) substrate, denoted as NiCoP@NiFe LDH/NF, to enhance the electrocatalytic capabilities for water electrolysis and hydrogenation of an organic, para -nitrophenol (4-NP). Benefitting from the charge redistribution across the p-n junction, high electrocatalytic efficiencies for oxygen evolution reaction (OER, overpotential of 388 mV at 100 mA cm −2 ) and hydrogen evolution reaction (HER, overpotential of 132 mV at 10 mA cm −2 ) could be achieved concurrently by the NiCoP@NiFe LDH/NF electrode, and both overpotentials were located within the mainstream levels in this domain. The bifunctional catalytic features enabled a full water electrolysis response of 10 mA cm −2 at 1.61 V. In addition, the p-n junction electrode catalyzed the hydrogenation of 4-NP at a conversion of 100%, para -aminophenol (4-AP) selectivity of 90% and faradaic efficiency (FE) of 88% at −0.18 V. The current work offers a feasible strategy for fulfilling electrochemical H 2 production and hydrogenation valorization of 4-NP pollutant by constructing a self-supported p-n junction catalytic electrode.
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高影响因子
LUMINESCENCE
·
2023
·Vol. 39
·期 2
·e4632
·
IF 2.9
Yinhui Yi,Jieling Hou,Xiaoya Bi,Lijun Luo,Libo Li,Tianyan You
It is of great significance to develop an effective method for methyl parathion (MP) detection. Herein, a novel nitrogen-doped titanium carbide quantum dots (N-Ti 3 C 2 QDs) was prepared and used to construct a simple and sensitive fluorescence sensing platform of MP by making use of inner filter effect (IFE). The prepared N-Ti 3 C 2 QDs can exhibit strong blue fluorescence at 434 nm. Meanwhile, MP could hydrolyze to produce p -nitrophenol (p-NP) under alkaline conditions, which showed a characteristic ultraviolet-visible (UV-visible) absorption peak at 405 nm, resulting in the fluorescence of N-Ti 3 C 2 QDs is effectively quenched by p-NP. In addition, the investigation of time-resolved fluorescence decays indicated that the corresponding quenching mechanism of p-NP on N-Ti 3 C 2 QDs is due to the IFE. After optimizing the conditions, the as-developed fluorescence sensing platform displayed wide detection range (0.1–30 μg mL −1 ) and low detection limit (0.036 μg mL −1 ) for MP, and it was also successfully applied for MP analysis in real water samples, thus it is expected that this simple, sensitive and enzyme-free sensing platform shows great applications.
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高影响因子
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