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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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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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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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 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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SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
·
2019
·
IF 2.931
Yue Hu,Yong Jia,Yunwen Liao,Xiaohui Jiang,Zhengjun Cheng
Poly(sodium-p-styrenesulfonate)-enhanced and D-penicillamine stabilized Ag nanoclusters (PSS-DPA-AgNCs) were prepared using one-step ultraviolet irradiation combined with microwave heating method, and the effects of the AgNCs photo-luminescence performance based on different types of polyelectrolytes and energy suppliers were studied detailedly. The as-prepared AgNCs can be used as a viable fluorescent probe for monitoring indirectly iron(II) lactate hydrate (ILH) and ammonium ferric citrate (AFC), respectively. The fluorescence (FL) quenching of PSS-DPA-AgNCs by Fe 3+ (it is obtained from oxidized ILH/ionized AFC) mainly derives from a dynamic quenching process. Excellent linear relationships exist between the FL quenching degree of the AgNCs and the concentrations of ILH/AFC in the range of 0.17–6.00/0.067–3.33 μmol·L −1 , and corresponding limit of detection (at 3σ/slope) is 12.4/6.04 nmol·L −1 . Moreover, the AgNCs probe was extended to the assays of ILH in tablets, solid beverage or ILH additive and AFC in two kinds of edible salts or syrup with satisfactory results compared with the standard 1, 10-phenanthroline method. In addition, the AgNCs probe reveals a good temperature sensing capability.
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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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高影响因子
MINERALS ENGINEERING
·
2019
·
IF 3.315
Wenjie Zou,Lu Gong,Jun Huang,Zhijun Zhang,Chunbao Sun,Hongbo Zeng
Selective flocculation separation has been widely used in fine coal flocculation. In order to promote the adsorption selectivity of flocculants onto coal surface, hydrophobically modified polyacrylamide P(AM-NaAA-C 16 DMAAC) was synthesized. The adsorption of P(AM-NaAA-C 16 DMAAC) on model clay and coal surfaces (i.e., silica, alumina and asphaltene surfaces) was investigated using quartz crystal microbalance with dissipation (QCM-D) monitoring technique. Floc size distribution, Fourier transform infrared spectrum, zeta potential measurement and selective flocculation flotation test were also conducted to study the performance of P(AM-NaAA-C 16 DMAAC) in the separation of fine coal. QCM-D measurements showed that a thin and rigid adsorption layer was formed on silica and alumina surfaces after injecting 1 mM sodium hexapolyphosphate (Calgon). This pre-formed layer inhibited the further adsorption of P(AM-NaAA-C 16 DMAAC) on silica and alumina. Meanwhile, the asphaltene surface could not be passivated by calgon due to the weak and reversible adsorption. Thus, a significant amount of P(AM-NaAA-C 16 DMAAC) (20 mg/L) absorbed on the calgon-treated asphaltene surface in 100 mM KCl solution was detected. With 20 mg/L P(AM-NaAA-C 16 DMAAC) in 100 mM KCl and 1 mM calgon solution, the maximum diameters of 10%, 50% and 90% of the cumulative volume distributions of the floc, i.e., d 10 (20.29 μm), d 50 (45.55 μm) and d 90 (89.99 μm) of the coal floc were 7.42, 3.20 and 2.19 times of those of kaolinite floc, respectively. Clean coal with a combustible recovery of 80.87% and ash content of 9.78% was obtained at a dosage of 5 g/t of P(AM-NaAA-C 16 DMAAC) and 900 g/t kerosene. Experimental results demonstrated that selective flocculation flotation with P(AM-NaAA-C 16 DMAAC) could enhance the recovery of fine coal particles with a lower dosage of collector. Our work sheds lights on the fundamental and practical understanding of the hydrophobic interactions in the selective flocculation of coal in the industries, and rational development of flocculants with better selectivity and flocculation efficiency.
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JOURNAL OF MATERIALS SCIENCE
·
2019
·Vol. 54
·期 17
·11417-11434
·
IF 3.442
Wang Dadao,Li Jian,Xu Zhifeng,Zhu Yeran,Chen Guoxin,Cui Zheng
A novel three-dimensional ball-flower-like g-C 3 N 4 /NiO (GN) photocatalyst was firstly fabricated by a simple two-step calcination method for enhanced degradation capability. Our investigation focuses on the construction of p–n heterojunction and specific ball-flower-like structure to overcome limitations of single-component semiconductors, such as low surface area, poor light response and fast recombination of the photogenerated electrons and holes. Detailed photocatalytic experiments revealed that the novel ball-flower-like GN (50%) exhibited much higher activity for the removal of TC and Cr 6+ than single g-C 3 N 4 , NiO and traditional layered GN. The trapping experiments proved that the superoxide radicals ( \( ^{ \cdot } {\text{O}}_{2}^{ - } \) ), holes (h + ) and electrons (e − )were the main active species in the photodegradation process. Moreover, three different degradation pathways and fourteen intermediate products of TC were also determined by the LC/MS analysis and these intermediates could be further degraded completely into CO 2 , H 2 O, \( {\text{NH}}_{4}^{ + } \) , carboxylic acids and any other inorganic intermediates. These results will benefit the fabrication of other 3D p–n heterojunction photocatalysts and their potential application in treatment of organic pollutants.
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ELECTROCHIMICA ACTA
·
2019
·
IF 5.383
Shifu Wang,Zuoyi Xiao,Shangru Zhai,Guoxiang Wang,Qingda An,Dongjiang Yang
To effectively enhance the overall electrochemical performance of supercapacitors , a high-temperature phosphorization strategy was developed to fabricate core-shell Ni-Ni x P y @C nanocomposite-immobilized sponge-like P-doped porous carbon (Ni-Ni x P y @C/P-HPC). The Ni-Ni x P y @C/P-HPC was successfully constructed by a cross-linking process and subsequent high-temperature calcination . During the pyrolysis process in N 2 multiple steps, including phosphating metal ions to Ni-Ni x P y nanoparticles , forming core-shell Ni-Ni x P y @C nanocomposites, doping P element into carbon skeleton and immobilizing core-shell Ni-Ni x P y @C nanocomposites onto porous carbon, were achieved simultaneously. The Ni-Ni x P y @C/P-HPC was studied using various characterization techniques. The results revealed that the obtained material integrated the advantages of interconnected P-doped framework (fast ion transport), nickel and nickel phosphide species (high theoretical specific capacitance), and graphene-like shell (excellent electrical conductivity and effective protection for activate sites). Therefore, the as-prepared hybrid delivered the outstanding electrochemical performance with ultrahigh specific capacity of up to 1275 F g −1 at 1 A g −1 and an excellent cycling stability with 92.5% capacity retention after 5000 cycles. Besides, the asymmetric supercapacitor using Ni-Ni x P y @C/P-HPC-900 and activated carbon as the anode and cathode materials exhibited a high energy density of 49.4 W h kg −1 at 250 W kg −1 , and remained as high as 30.6 W h kg −1 even at 5000 W kg −1 . Our research will open up a new way to synthesize transition metal phosphide@carbon composites with excellent electrochemical properties.
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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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DALTON TRANSACTIONS
·
2018
·Vol. 47
·期 36
·12759-12768
·
IF 4.099
Kun Qian,Xuguang Lv,Sheng Chen,Hang Luo,Dou Zhang
Dielectric polymer-based nanocomposites have attracted significant attention in recent years for energy storage applications because of their potential high permittivity and breakdown strength. The coupling effect of a nanofiller/matrix interface plays a crucial role in the dielectric and electric properties of polymer-based nanocomposites. In this paper, three kinds of side-chain liquid crystalline fluoric-polymers, denoted as P-nF (n = 3, 5 or 7, which is the number of terminal fluoric groups), were grafted on the surface of BaTiO3 nanoparticles by a surface-initiated reversible-addition–fragmentation chain transfer polymerization method. The nanocomposite films were prepared via core–shell BaTiO3 nanoparticles dispersed in a poly(vinylidene fluoride-trifluoroethylene-chlorotrifluoroethylene) P(VDF-TrFE-CTFE) polymer matrix. The frequency dependent dielectric properties and energy storage capability of the polymer nanocomposites were studied. The results showed that the permittivity and energy densities of the polymer nanocomposites depended on the molecular structure of the modifier, especially the number of electron-rich fluoric groups. Firstly, all modified BaTiO3 nanoparticles were homogeneously dispersed in the polymer matrix, resulting in the polymer nanocomposites presenting a higher breakdown strength compared with the unmodified BaTiO3 nanoparticles. Secondly, the changes in the nanocomposites’ permittivity exhibited diversity for three modifiers due to many influential factors. Thirdly, compared with neat P(VDF-TrFE-CTFE), the discharge energy densities of the polymer nanocomposites are all significantly improved. The highest discharge energy densities of nanocomposites with 5 vol% P-3F@BT reached 14.5 J cm−3. These findings suggest that the optimal interfacial modifier should be carefully decided by combining various properties of the nanocomposites for energy storage.
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