CHEMICAL ENGINEERING JOURNAL
·
2011
·
IF 3.074
Ting Wu,Xiang Cai,Shaozao Tan,Hongye Li,Jiesheng Liu,Weidong Yang
In order to explore the potential of graphene (G) in removal of hazardous chemicals in waste water, chemically reduced graphene oxide was employed as the adsorbent and the adsorption characteristics of graphene toward acrylonitrile (AN), p-toluenesulfonic acid (p-TA), 1-naphthalenesulfonic acid (1-NA) and methyl blue (MB) were evaluated under laboratory conditions. The results showed that the organic chemicals with larger molecule size and more benzene rings possessed a higher adsorption speed and a higher maximum adsorption capacity on G. The maximum adsorption capacities of p-TA, 1-NA and MB on G are ∼1.43 g/g G, ∼1.46 g/g G and ∼1.52 g/g G at 30 °C, respectively, which are the highest values of p-TA, 1-NA or MB adsorption on different kinds of today's nanomaterials. Under the maximum adsorption capacity, the absorption quantity of MB on G was dependent on the initial concentration of MB, and higher temperature could facilitate the adsorption process. The G efficiency remains almost constant during the first five cycles of the adsorption–desorption process. In addition, the fluorescence spectra implied that the adsorption of MB on G was a π–π stacking adsorption process. In conclusion, the G could serve as a promising adsorbent for the removal of chemicals containing benzene rings in waste water.
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高影响因子
JOURNAL OF CHEMICAL THERMODYNAMICS
·
2018
·
IF 2.631
Jun Wang,Deyan Wang,Chunxiang Huang,Xueni Sun,Xiaoyong Yue,Hui Shao,Yixin Leng
Isobaric vapour–liquid equilibrium (VLE) data for two binary systems of p-Cresol (PC) + diethanolamine (DEA) and m-Cresol (MC) + DEA were measured at 20.0 kPa. The Herington area method was used to check the binary VLE data, and the results showed good thermodynamic consistency. Meanwhile, the Wilson, NRTL, UNIQUAC models and the chemistry theory proposed by Dolezalek were used to correlate the VLE data. The binary energy interaction parameters for activity models, and reaction equilibrium constants for chemistry theory were obtained. With help of the parameters obtained in this work, the NRTL model was used to predict the VLE data of the two binary systems at the pressure of 8.33 kPa. The predictive results were compared with the literature’s data. At same time, the excess Gibbs free energy for the two binary systems, and infinite dilution activity coefficients for MC and PC in DEA were estimated. The calculated results showed that the DEA had slightly stronger interaction with PC than MC.
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高影响因子
ACS Applied Materials & Interfaces
·
2019
·
IF 8.456
Pengfei Song,Li Kang,Hao Wang,Rong Guo,Rongmin Wang
The electrocatalytic conversion of nitrogen gas at ambient conditions represents a novel approach for ammonia synthesis to the sustainable society. It is critical to understand the detailed pathways and mechanisms of this promising process to develop a highly efficient catalyst. Herein, the N, P co-doping carbon (NP-C-MOF-5) catalyst was prepared for electrocatalytic N2 reduction in acid electrolytes under ambient temperatures and pressures. Experimental results showed that there are two products including NH3 and N2H4·H2O on the NP-C-MOF-5 cathode at −0.1 V versus RHE with the yield of 1.08 and 5.77 × 10–4 μg h–1 mgcat.–1, respectively. Moreover, an electrocatalytic pathway on NP-C-MOF-5 was investigated by the electrochemical in situ Fourier transform infrared technique. The results confirmed the formation of N2Hy (1 ≤ y ≤ 4) intermediates on NP-C-MOF-5 cathode surfaces, suggesting an associative pathway for the N2 reduction reaction.
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ChemCatChem
·
2022
·Vol. 14
·期 15
·e202101954
·
IF 5.497
Lulu Bai,Hao Sun,Qiang Wu,Weifeng Yao
Graphical Photocatalytic H 2 O 2 evolution : A new P-doped carbon nitride loaded with ruthenium single atoms and clusters was successfully synthesized by photoreduction method. It has exhibited an excellent photocatalytic activity toward H 2 O 2 evolution. This study surmounts people‘s understanding that precious metal loading is not conducive to H 2 O 2 selectivity and provides ideas for the design of extremely active and stable single-atom and clusters. Photocatalytic H 2 O 2 evolution via two-electron oxygen reduction is a promising path for renewable and on-the-spot H 2 O 2 production compared with the traditional anthraquinone method. However, the efficiency of photocatalytic production of H 2 O 2 is usually very low. Herein, P-doped carbon nitride loaded with ruthenium single atoms and clusters (Ru atom /P-CN) is reported as an efficient photocatalyst for H 2 O 2 production. The yield of H 2 O 2 over Ru atom /P-CN (385.8 mmol g −1 h −1 ) is about 4.3 times higher than that of P-CN (88.9 mmol g −1 h −1 ) and 3.6 times higher than that of ruthenium nanoparticles loaded P-CN (105.9 mmol g −1 h −1 ). Further mechanistic study indicates that the presence of Ru in the form of single atoms and clusters not only improves the separation efficiency of photogenerated carriers and inhibits the recombination of photogenerated electron-hole pairs, but also increases the reactive sites of this catalytic system. This study breaks through people‘s understanding that precious metal loading is not conducive to H 2 O 2 selectivity and provides a new way to prepare low-metal loading, high-activity photocatalysts for H 2 O 2 production.
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高影响因子
ACS Applied Nano Materials
·
2024
·
IF 5.3
Tianyue Su,Junsheng Wang,Chun Cai
The nickel phosphides have garnered increasing attention as an excellent catalytic site in the fields of electrocatalysis and hydrotreating, but their application in organic synthesis remains infrequent. In this study, ammonium phosphate and nickel chloride were employed as the doping sources for the first time to synthesize the Ni-based ZIF-8 precursor via the host–guest method. Subsequently, the precursor was pyrolyzed to obtain Ni2P nanoparticles (NPs) supported on N, P co-doped carbon. The composite materials exhibit elevated metal loading and effective dispersion due to the synergistic combination of phosphorus and nickel. Specifically, compared with Ni-NC, the optimal Ni2P-NCP-1 exhibits enhanced catalytic activity in the α-alkylation of arylacetonitriles with alcohols using KOH as the base. It shows a wide broad substrate scope at 140 °C for 12 h in n-octane using a hydrogen borrowing strategy. Through characterizations and mechanistic studies, it has been discovered that the introduction of P source not only provides more basic sites on carbon matrix but also leads to the formation of Ni2P NPs, which facilitates the catalytic efficiency by modifying the electronic structure of Ni. Compared with the metallic Ni species, the synergistic effect between Ni2P and acid-basic sites significantly influences the dehydrogenation of alcohols to generate Ni–H species. This study successfully achieves simultaneous phosphating of both the metal and support, and it also demonstrates that the N2P-NCP-1 catalyst has significant potential in the heterogeneous organic transformation field.
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JOURNAL OF APPLIED POLYMER SCIENCE
·
2013
·Vol. 130
·期 1
·645-653
·
IF 1.395
Wenlong Qin,Gang Wu,Peipei Yin,Hongzheng Chen
RGB tricolor organic pigments were in situ modified by stearyl methacrylate-2-(dimethylamino)ethyl methacrylate-styrene random copolymer [P(SMA-DMA-St)] through solution polymerization. The modified particles were charged in tetrachloroethylene (TCE) with the aid of suitable charge control agent. The structure and electrophoretic property of ink particles were characterized by FTIR, TEM, PALS, et al. P(SMA-DMA-St) modification decreased the particles size and enhanced the suspending stability of the pigments in tetrachloroethylene due to the repulsive forces among the treated pigment particles resulting from the extending polyacrylate chain in the media. Partial crosslinking the P(SMA-DMA-St) on the pigment surface with ethylene glycol dimethacrylate (EGDMA) helped to increase the Zeta potential and electrophoresis mobility of RGB electrophoretic particles. The maximum values of the Zeta potential for red, green, and blue electrophoretic particles reached −36.2, −57.7, and −42.7 mV, respectively. The obtained RGB electrophoretic particles could be applied in the color/white dual-particle electronic ink together with charged TiO 2 to show vivid color and white images under a DC electric field. © 2013 Wiley Periodicals, Inc. J. Appl. Polym. Sci., 2013
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CERAMICS INTERNATIONAL
·
2019
·
IF 3.45
Chunyan Su,Yazhou Zhou,Lili Zhang,Xiaohui Yu,Shuai Gao,Xiujuan Sun,Chao Cheng,Qinqin Liu,Juan Yang
Graphitic carbon nitride (g-C 3 N 4 ) has been demonstrated to be a rising star among semiconductor materials for photocatalytic hydrogen (H 2 ) production. However, pristine g-C 3 N 4 usually suffers from inferior activity due to the inadequate visible light harvesting capacity and quick charge recombination. Herein, porous P doped g-C 3 N 4 nanosheets (PCNNSs) were fabricated via a simple thermal condensation of adenosine phosphate and urea followed by thermal exfoliation method. The synergetic effect of the porous structure and P dopant can provide abundant active sites for the photocatalytic reaction, which can enhance light absorption range extending from 450 nm to 700 nm attributed to the n→π* electronic transition, and improve hydrophilicity for easier water molecules adsorption via introducing hydroxyl groups. Furthermore, impurity level caused by the P dopant would change the excitation process and accelerate the charge separation efficiency. Therefore, the PCNNSs exhibited significantly elevated photocatalytic H 2 generation performance (9523.7 μmolg -1 h -1 ) under visible-light (λ > 420 nm) irradiation, which was about 20 times that of unmodified g-C 3 N 4 (458 μmol -1 h -1 ).
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高影响因子
COMPOSITES PART B-ENGINEERING
·
2022
·
IF 11.322
Feichong Yao,Wenhao Xie,Chao Ma,Dedong Wang,Zeinhom M. El-Bahy,Mohamed H. Helal,Hu Liu,Ai Du,Zhanhu Guo,Hongbo Gu
The polymer nanocomposites with 3-dimensional (3D) nanofillers can form a 3D network and attain a uniform distribution of nanofillers, which benefits the transfer of charge carriers and phonons as well as the dispersion of stress at a very low loading of nanofillers. These polymer nanocomposites with high mechanical properties would have great potential for thermal and electrical conduction as well as electromagnetic interference (EMI) shielding. In this paper, the 3D epoxy nanocomposites are manufactured by stuffing epoxy resin into 3D p -phenylenediamine-aniline copolymer nanofibers@Cu foam (P-PANI@f-Cu) hybrid nanofillers that are constructed by electrophoretic deposition of phosphoric acid doped P-PANI copolymer nanofibers onto the surface of sodium hydroxide oxidized Cu foam. Benefiting from 3D continuous network of P-PANI@f-Cu hybrid nanofillers, the electrical conductivity and thermal conductivity of 3D P-PANI@f-Cu/epoxy nanocomposites with the P-PANI loading of 0.262 wt% could achieve 7.71 ± 0.04 S cm −1 and 5.4670 ± 0.0085 W m −1 K −1 , respectively, which are much better than that of pure epoxy (insulator and 0.2310 ± 0.0017 W m −1 K −1 , respectively) and epoxy composites filled with only Cu foam (4.46 ± 0.03 S cm −1 and 2.7907 ± 0.0057 W m −1 K −1 , respectively). Meanwhile, with a thickness of 1.8 mm, the average total EMI shielding effectiveness (SE T ) of 3D P-PANI@f-Cu/epoxy nanocomposites in the X-band range reaches a high value of 66.14 dB, which is capable of effectively shielding the electromagnetic signal between Bluetooth earphone and smartphone in the practical application. Furthermore, the 3D P-PANI@f-Cu hybrid nanofillers can efficiently prevent the crack growth in the epoxy nanocomposites and improve their mechanical properties including hardness and elastic modulus .
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CHEMISTRY OF MATERIALS
·
2020
·
IF 9.567
Huanhuan Jia,Xinmiao Liang,Tao An,Linfeng Peng,Jiwen Feng,Jia Xie
Finding sodium solid electrolytes (SSEs) with good performance is key to building all-solid-state sodium batteries. In the development of solid electrolytes, halogen doping has been shown to be an effective approach. However, it has rarely been applied to chalcogenide-based SSEs, possibly because of strict structure constraints. In this work, the strategy of halogen doping is successfully demonstrated on Na3.67[Sn0.67Si0.33]0.67P0.33S4, a novel SSE with high structural tolerance. The halogen-doped samples formulated as Na3.57[Sn0.67Si0.33]0.67P0.33S3.9X0.1 (X = Cl, Br, and I) exhibit higher ionic conductivities and lower activation energies than the pristine sample. Na3.57[Sn0.67Si0.33]0.67P0.33S3.9I0.1, the I-doped sample, has the highest ambient ionic conductivity of 1.08 mS cm–1 and the lowest activation energy of 0.24 eV. Structure analysis indicates that the high electronegativity of Cl atoms plays an important role in improving the conduction of Na+ ions in Cl-doped samples. The large atomic radius and high polarizability of I are more important factors to accelerate the transportation of Na+ ions in the I-doped counterpart. Furthermore, the all-solid-state sodium batteries assembled with Na3.57[Sn0.67Si0.33]0.67P0.33S3.9I0.1 as solid electrolytes show decent cyclic stability at 30 °C with a current density of 0.15 A g–1. This work systematically manifests the effect of halogen doping in SSEs, providing a versatile method to develop novel SSEs.
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高影响因子
Journal of Cleaner Production
·
2021
·
IF 9.297
Chuankun Yin,Siji Zhou,Keyi Zhang,Jiale Bai,Yangyang Lv,Xuewen Zhang,Xiaoxia Li,Aihua Xu
p-Nitrophenol (PNP) is one of the highly toxic and mutagenic pollutants existed in aquatic environment. In this work, the crednerite CuMnO 2 nanoflake was prepared and used to degrade PNP with peroxymonosulfate (PMS) as the oxidant. It was found that CuMnO 2 exhibited much higher activity than other Cu-based catalysts such as CuO, Cu 2 O, CuFe 2 O 4 and CuFeO 2 , with 90% of PNP degraded after 10 min under mild reaction conditions. The catalyst was also stable during five successive runs. Sulfate and hydroxyl radicals produced from PMS reduction by Cu(I) species, as well as superoxide ions and single oxygen, contribute to the degradation of PNP. More importantly, the interactions between Mn and Cu species in CuMnO 2 were identified by X-ray photoelectron spectroscopy (XPS), fourier transform infrared spectroscopy (FT-IR) and linear sweep voltammetry (LSV), and were further confirmed by the control experiment with the mixture of Cu 2 O + Mn 2 O 3 . The results implied that the high valent Mn(III) species acted as Lewis acids to withdraw electron from PMS, resulting that the Cu(I) species can be easier oxidized to Cu(II) by PMS with the formation of radicals. These findings provide an ideal bimetallic heterogeneous catalyst and a new mechanism for PMS-mediated reaction.
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高影响因子
CELLULOSE
·
2019
·Vol. 26
·期 12
·7553-7567
·
IF 3.917
Liu Mingsheng,Huang Shuo,Zhang Guangxian,Zhang Fengxiu
Abstract A durable and effective flame retardant (FR) was synthesized in this work by taking advantage of the high reactivity of a cyclodiphosphazane derivative, without the use of formaldehyde. The FR is halogen-free and has the synergistic effect of phosphorus, nitrogen and silicon. Fire resistance of the cotton fabrics is significantly enhanced after the FR treatment. The limiting oxygen indices of cotton treated with 30% FR increase from 18.2 to 52.9% and decrease to 27.2% after 50 launder cycles, demonstrating that the proposed material is a durable FR. The thermo-gravimetric analysis results indicate that compared with the control cotton, the degradation process of the treated cotton occurred at a lower temperature range, the degree of degradation was lower, and the residue is improved. The total heat release and the effective heat combustion values are notably lower for the treated cotton than the control cotton. Furthermore, mechanical property tests demonstrate that the tensile strength is largely retained, while the bending length of the treated cotton partly increases. The surface morphology of the treated cotton is investigated with scanning electron microscopy. Fourier transform infrared and elemental analysis show that the FR was successfully grafted onto the surface of the cotton fabric. 1 H, 13 C, and 31 P nuclear magnetic resonance verify the chemical structure of the FR.
Graphic abstract
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CHEMOSPHERE
·
2022
·
IF 8.943
Zhi Li,Qingxiang Zhou,Shuangying Li,Menghua Liu,Yanhui Li,Chunmao Chen
In this study, a label-free “turn off” fluorescent sensor has been resoundingly fabricated using carbon dots (CDs) for ultrasensitive detection of copper ions (Cu 2+ ). CDs are prepared by solid phase carbonization method using p-toluidine and l -cysteine as the precursors. The synthesized CDs exhibited the highest fluorescence intensity with excitation and emission wavelengths set at 300 nm and 400 nm, respectively. The CDs were selective and sensitive to Cu 2+ due to the static quenching mechanism. The concentration of CDs, and solution pH and incubation time were important parameters for the developed sensor. The experimental results showed that 20 mgL −1 was enough for the analysis. As the solution pH was concerned, it was apparent that the sensor was endowed with an excellent response signal to Cu 2+ and provided high sensitivity at pH 12. The interaction occurred very quickly, and the incubation time could be set at 1 min. The sensor provided a two-stage calibration curve to Cu 2+ in the range of 0.05–0.7 and 0.7–4 μM with a limit of detection of 47 nM. The obtained results clearly demonstrated that this facile method was fast, reliable and selective for detecting Cu 2+ , which would explore a prospective strategy for developing effective and low-cost sensors for monitoring metal ions in aqueous environments.
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