Frontiers in Chemistry
·
2020
·
IF 3.693
Wang Xiaodong,Hu Weizhao,Hu Yuan
In this study, h-BN@PDA@TiO2 hybrid nanoparticles were prepared and used as functional fillers to prepare PVA nanocomposites, and the effects of hybrid particles on PVA thermal conductivity and flame retardant properties were studied. The results showed that hybrid particles could significantly improve the thermal conductivity and flame retardant performance of PVA composites, and effectively inhibit the release of toxic gases such as combustible pyrolysis products and CO, which enhanced the fire safety of PVA composites. When the addition amount of hybrid particles is 5 wt%, the thermal conductivity of PVA composites is 239.1% higher than that of the pure PVA and the corresponding temperature of PVA composites with a mass loss of 5 wt% was 16.2°C higher than that of the pure PVA. This is due to the barrier effect of h-BN and the protective effect of dense carbon layer catalyzed by TiO2.
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高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2020
·
IF 10.652
Kezhu Xu,Jin Wu,Qunling Fang,Linfeng Bai,Jinyu Duan,Jiaxing Li,Huajian Xu,Ailing Hui,Lingyun Hao,Shouhu Xuan
The organic pollutants and heavy metal ions are critical harmful substances in waste water because they destroy the ecological systems and lead diseases to animals and human beings. Unfortunately, the simultaneously remove of them in one system is still a challenge due to their different treating mechanism. Herein, a novel magnetic h-Fe 3 O 4 @Au/Polydopamine (Au/PDA) hybrid hollow nanosphere which can both absorb the potentially toxic U(VI) ions and catalyze the reduction of the 4-nitrophenol is reported. By using a simple in situ redox-oxidizing polymerization method, the h-Fe 3 O 4 hollow nanosphere is well encapsulated by the Au/PDA hybrid shell to form the dual-functional magnetic hollow nanocomposites. Owing to the hollow interior, uniform and functional PDA coating, and high active Au nanocrystals, the final h-Fe 3 O 4 @Au/PDA hollow nanosphere possesses high potential in nanocatalysis, heavy metal ions adsorption, and drug delivery. Because of the PDA protection, the h-Fe 3 O 4 @Au/PDA nanosphere can even keep 90% activity after 7 cycling catalytic reactions on reduction of 4-nitrophenol. Similarly, the h-Fe 3 O 4 @Au/PDA exhibits a good adsorption effect for U(VI) in nuclear waste and its adsorption capability reaches to 82.9 mg·g −1 by 6 successive adsorption–desorption experiments. Due to the facile magnetic separation, the h-Fe 3 O 4 @Au/PDA nanosphere can be easily collected by applying an external magnetic field. In summary, such a multifunctional recyclable h-Fe 3 O 4 @Au/PDA nanosphere with green and facile synthesis, easy manipulation, efficient adsorption performance and good catalytic activity possesses broad application potential in treatment of coexisting toxic water pollution.
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MATERIALS LETTERS
·
2022
·
IF 3.574
Feifei Zhou,Ganghua Pan,Haining Meng,Hailong Sun
For preparing finer and well-dispersed calcium-silicate-hydrate (C-S-H) seeds at a lower cost, the waste solution of acid treatment of recycled concrete aggregates (RCAs) and black liquor from pulping were used for the synthesis of C-S-H seeds. The results show that C-S-H seeds can be successfully fabricated by chemical co-precipitation reaction using the two waste solutions. Interestingly, it was globular rather than traditional foil-like. Furthermore, C-S-H seeds synthesized using the two waste solutions had smaller particle size and better dispersibility. More importantly, it had a more prominent accelerating effect to the strength development of mortar, significantly enhancing the early and long-term compressive strength of mortar.
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高影响因子
Frontiers of Chemical Science and Engineering
·
2024
·Vol. 18
·期 10
·1-10
·
IF 4.3
Jia Hongwei,Yue Xiaoyang,Hou Yuying,Huang Fei,Cao Cuiyao,Jia Feifei,Liu Guanhua,Zheng Xiaobing,Liu Yunting,Jiang Yanjun
Unspecific peroxygenases exhibit high activity for the selective oxyfunctionalization of inert C(sp 3 )-H bonds using only H 2 O 2 as a clean oxidant, while also exhibiting sensitivity to H 2 O 2 concentration. CdS-based semiconductors are promising for the photosynthesis of H 2 O 2 owing to their adequately negative potential for oxygen reduction reaction via a proton-coupled electron transfer process, however, they suffer from fast H 2 O 2 decomposition on the surface of pristine CdS. Therefore, [Cp*Rh(bpy)H 2 O] 2+ , a highly selective proton-coupled electron transfer catalyst, was anchored onto a supramolecular polymer-grafted CdS nanoflower to construct an efficient integrated photocatalyst for generating H 2 O 2 , mitigating the surface issue of pristine CdS, increasing light absorption, accelerating photonic carrier separation, and enhancing oxygen reduction reaction selectivity to H 2 O 2 . This photocatalyst promoted the light driven H 2 O 2 generation rate up to 1345 µmol·L −1 ·g −1 ·h −1 , which was 2.4 times that of pristine CdS. The constructed heterojunction photocatalyst could supply H 2 O 2 in situ for nonspecific peroxygenases to catalyze the C-H oxyfunctionalization of ethylbenzene, achieving a yield of 81% and an ee value of 99% under optimum conditions. A wide range of substrates were converted to the corresponding chiral alcohols using this photo-enzyme catalytic system, achieving the corresponding chiral alcohols in good yield (51%–88%) and excellent enantioselectivity (90%–99% ee).
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高影响因子
JOURNAL OF POWER SOURCES
·
2024
·
IF 8.1
Zixuan Li,Dequan Bao,Wei Zhao,Wenxuan Xu,Yingheng Huang,Xiyong Chen,Hao Zhang,Xuhui Sun
Gel polymer electrolytes (GPEs) have emerged as a highly promising alternative to conventional liquid electrolytes for stable lithium-metal batteries (LIBs). However, their inherent poor mechanical properties and limited interfacial compatibility with lithium metal usually lead to unexpected growth of lithium dendrites , hindering commercial viability. Herein, an asymmetric polymer electrolyte with h-BN (HGPE) as protective layer was fabricated via a facile one-step coating strategy. Compared to pure GPE, the asymmetric polymer electrolytes exhibit significantly enhanced mechanical strength from 4.4 MPa to 7.4 MPa, effectively suppressing lithium dendrite growth. Furthermore, the HGPE improves interfacial compatibility with the anodes by preventing direct contact between GPE and lithium metals. The addition of h-BN also enhances the lithium-ion transfer number (t Li+ ), reaching 0.87 compared to 0.53 for pure GPE, attributed to the hindrance of anion movement by the protective layer. Consequently, the Li symmetric battery assembled with HGPE demonstrate exceptional long-term stability, maintaining performance over 1600 h at 0.1 mA cm −2 . Furthermore, the assembled Li|LiFePO 4 battery can deliver a high-capacity retention rate of 93.8 % after 500 cycles at room temperature, showcasing the promising potential of asymmetric polymer electrolytes for high-performance LMBs.
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高影响因子
Journal of the American Chemical Society
·
2026
·
IF 16.6
Jian-Hua Chen,Zi-Tong Long,Kun-Yu Cai,Hui-Jie Tu,Hong-Cai Wu,Fei-Qin Bian,Lin-Dong Liu
Fenton-like reactions are fundamental to environmental remediation, yet conventional electron-centric frameworks overlook critical proton transfer contributions. Here, we demonstrate that strategic modulation of proton transfer enhances heterogeneous Fenton-like reactivity by two orders of magnitude through validated proton-coupled electron transfer (PCET) mechanisms. Two complementary strategies emerged: modifying catalyst surface hydroxyl density and tuning solution pH. Mechanistic investigations revealed that hydroxyl modifications alter the surface O–H bond dissociation free energy (BDFE), while pH adjustments follow Brønsted–Evans–Polanyi (BEP) relationships. We developed electrochemical methods for quantifying BDFE alongside techniques for measuring net H• transfer rates involving surface hydroxyl groups. This paradigm transcends electron-centric approaches by establishing comprehensive theoretical frameworks for reaction enhancement and by providing transformative proton-transfer-based modulation strategies to overcome inherent activity limitations in practical Fenton-like applications.
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高影响因子
Science Bulletin
·
2026
·
IF 20.7
Ying Feng,Zhiquan Hou,Peijie Ma,Xiaohui Yu,Xun Wang,Kun Zheng,Yuxi Liu,Zhihua Wang,Zhenxia Zhao,Jiguang Deng,Hongxing Dai
The activation of C–H bonds is a fundamental process in various chemical reactions, while faces significant challenge under mild conditions due to the high bond energy and low polarity. An ultrathin (∼3 nm) amorphous oxygen-containing carbon layer inserted into Pt/TiO 2 yields C–O–M (M = Pt and Ti) dual interfaces. The photothermocatalytic consumption rate of n -heptane over Pt/C/TiO 2 at 140 ℃ is 8.8 and 61.8 times higher than that over Pt/TiO 2 and Pt/C, respectively. Temperature-programmed desorption (TPD) and density functional theory (DFT) calculations reveal that the constructed C–O–M interfaces significantly enhance the adsorption of hydrocarbon reactant, and decrease the C–H bond scission energy barrier. The photothermal X-ray photoelectron spectroscopy (XPS), femtosecond transient absorption (fs-TA) and electron paramagnetic resonance (EPR) experiments demonstrate that the C–O–Ti interface accelerates the electron migration and transforms the adsorbed oxygen into the superoxide species, thus efficiently oxidizing the reactant. Furthermore, introduction of an amorphous carbon layer to Pt/Al 2 O 3 , Pt/CeO 2 , Ce/TiO 2 or Cu/TiO 2 remarkably enhances the photothermal catalytic performance for propane, pentane, octane, toluene or hexanal oxidation. The unique effect of C–O–M dual interfaces induced via the ultrathin amorphous carbon layer provides a guideline for designing catalysts with efficient C–H bond activation ability.
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高影响因子
Journal of Environmental Chemical Engineering
·
2026
·Vol. 14
·期 2
·121666
·
IF 7.5
Jianjun Chen,Qian Zhao,Hongxing Shi,Ying Li,Limin Wang
The coexistence of cationic and anionic dyes in wastewater necessitates the development of amphoteric adsorbents. Herein, amphoteric hydrogel microspheres SA-S@PDA-H was successfully fabricated for their simultaneous removal. The microspheres were synthesized by crosslinking sodium alginate (SA) with Ca²⁺, followed by coating with polydopamine (PDA) and stearyl trimethyl ammonium chloride (STAC). The microspheres prepared through acid treatment to replace STAC was labeled SA-S@PDA-H, endowing the microspheres with enhanced adsorption capacity. FT-IR, SEM, zeta potential was utilized to characterize the structure and morphology of SA-S@PDA-H. The adsorption behavior and mechanism of SA-S@PDA-H for cationic and anionic dyes was investigated in depth. The results show SA-S@PDA-H exhibit 127.3 % of swelling ratio. The adsorption of SA-S@PDA-H for MB and MO reaches equilibrium at about 300 min followed by PSO model. The adsorption process of SA-S@PDA-H for MB and MO followed Temkin and Dubinin-Radushkevich model, respectively, and the maximum adsorption capacity displayed 869.1 mg/g at 45°C and 730.9 mg/g at 15°C, for MB and MO, respectively. MB adsorption increased with higher temperature and pH, while MO adsorption increased with lower temperature and pH. Adsorption of both dyes decreased at high ionic strength, and Cu 2 + and Fe 3+ had a significant inhibitory for MB than K + , while the inhibitory effects of SO 4 2- or CO 3 2- is more obvious for MO than Cl - . SA-S@PDA-H exhibited excellent adsorption performance for mixed cationic and anionic dyes through synergistic effects including electrostatic interactions, hydrogen bonds, π-π stacking and micropore filling. The microspheres maintained over 80 % removal efficiency after five consecutive adsorption-desorption cycles.
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高影响因子
Journal of Environmental Chemical Engineering
·
2026
·Vol. 14
·期 5
·123598
·
IF 7.5
Di Li,Huimin Zhu,Yuan Zhang,Shaofei Yang,Ruiyu Zhu,Jiaoe Dang,Fang Song,Jun Zhou
The escalating global energy crisis and environmental pollution has drawn increasing attention. As a green and sustainable alternative, photocatalytic H 2 O 2 synthesis has attracted widespread interest. In this study, we has designed a novel exciton-regulated photocatalyst (Bi@g-C 3 N 4 /ST-NS) by integrating bismuth-doped graphitic carbon nitride with porphyrin-based supramolecular nanostructures (ST-NS). The composite was synthesized through a sequential process involving solvothermal reaction, high-temperature calcination, and solution-phase self-assembly. We systematically investigated its crystal structure, photoelectronic properties, and the mechanistic basis of photocatalytic H 2 O 2 production. Characterization results confirmed the successful incorporation of Bi single atoms into the sixfold cavities of g-C 3 N 4 , forming a p-n heterojunction with ST-NS while preserving the crystallinity of the host matrix. The built-in interfacial electric field not only promoted efficient charge separation but also extended the visible-light absorption range and prolonged the carrier lifetime. Performance evaluations revealed that Bi@g-C 3 N 4 /ST-NS exhibited significantly enhanced H 2 O 2 generation activity compared to pristine Bi@g-C 3 N 4 , with optimal performance achieved at a 10:1 mass ratio. Under visible-light irradiation, the H 2 O 2 concentration reached 1134 μM in the reaction solution, representing a 2.5-fold improvement over Bi@g-C 3 N 4 . Mechanistic studies indicated that the heterojunction facilitated efficient intersystem crossing from singlet to triplet excitons. Rather than following the conventional superoxide radical (·O 2 - ) pathway, these triplet excitons activated ground-state oxygen to generate singlet oxygen ( 1 O 2 ) via resonance energy transfer. The subsequent highly selective two-electron reduction of 1 O 2 yielded H 2 O 2 , effectively circumventing the high-energy barrier steps associated with traditional pathways. This work thus presented a promising strategy for the rational design of high-efficiency photocatalytic systems through exciton regulation.
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高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2022
·Vol. 139
·期 24
·52335
·
IF 3.057
Hao Zhang,Ying Jun Li,Jun Zeng,Hui Ping Liu,Yuan Lin Zhou
In order to solve the problem of poor thermal conductivity of polymer-based radiation shielding composite materials, h-BN@PDA@PbWO 4 hybrid powders were prepared by combining h-BN with high thermal conductivity and PbWO 4 with γ shielding. With the assistance of polydopamine, PbWO 4 particles were synthesized in situ on the h-BN surface. The effects of h-BN@PDA@PbWO 4 on thermal conductivity, γ-ray shielding, and mechanical properties of chloroprene rubber were studied. The results showed that the hybrid particles had better dispersibility than the pure mixing of h-BN and PbWO 4 in chloroprene rubber and significantly improved the thermal conductivity gamma-ray shielding performance and mechanical properties of CR composites. When the filler content of the hybrid powder reaches 40 wt%, the thermal conductivity of the composite is about 3.16 times that of the pure CR. The γ shielding rates at 86.5 KeV and 105.3 KeV photon energies increase by 14.14% and 17.61% compared with the pure CR. Compared with pure CR, the tensile strength of the composites increased by 4.79 MPa, and the elongation at break decreased slightly. These were because h-BN@PDA@PbWO 4 shows had an excellent synergistic effect in CR substrate. The new kind of CR/h-BN@PDA@PbWO 4 composite can be used for thermal management and gamma shielding.
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Journal of Materials Chemistry A
·
2013
·Vol. 1
·期 16
·5031-5036
·
IF 0
Chu Liang,Yongfeng Liu,Mingxia Gao,Hongge Pan
In this paper, we report a KOH-doped Mg(NH2)2–2LiH system with low operating temperatures and good cycling stability. The Mg(NH2)2–2LiH–0.07KOH sample can reversibly desorb/absorb ∼4.92 wt% hydrogen with a starting and peak dehydrogenation temperature of ∼75 °C and ∼120 °C, respectively, the lowest in the current Mg(NH2)2–2LiH system studied. Moreover, the cycling stability of de-/hydrogenation is also remarkably improved by KOH doping as the average capacity degradation of the Mg(NH2)2–2LiH–0.07KOH system is of only 0.002 wt% per cycle within 30 cycles. Detailed structural investigations reveal that during ball milling, the doped KOH can react with Mg(NH2)2 and LiH to convert to MgO, KH and Li2K(NH2)3, which work together to provide the synergistic effects of thermodynamics and kinetics on hydrogen desorption and absorption of the Mg(NH2)2–2LiH system upon heating, consequently inducing a significant improvement in hydrogen storage properties.
研究领域:
材料科学
·
氢气储存
·
能源材料
·
固态化学
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PHOSPHORUS SULFUR AND SILICON AND THE RELATED ELEMENTS
·
2017
·
IF 0.809
Huili Ma,Shuyun Liu,Shaohua Zhu,Wenzhu Bi,Xiaolan Chen,Yufen Zhao
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