JOURNAL OF APPLIED POLYMER SCIENCE
·
2015
·Vol. 133
·期 6
·
IF 1.768
Maolin Li,Yuhua Zhong,Zheng Wang,Andreas Fischer,Florian Ranft,Dietmar Drummer,Wei Wu
A novel flame-retardant composite was prepared by introducing a phosphorus-nitrogen flame retardant and DOPO-SiO 2 into PA6. DOPO-SiO 2 was synthesized successfully in a one-step process. PA6/OP1314/DOPO-SiO 2 achieved a UL 94 V-0 rating with an LOI value of 31%. The maximum mass loss rate of decomposition decreased significantly and char residue increased to 11.6 wt % compared with that of pure PA6. The compacted and dense char was formed due to the combination of the P-N flame retardant and DOPO-SiO 2 . The complex viscosity of PA6/OP1314/DOPO-SiO 2 increased considerably which tend to prevent the dripping phenomenon. The flame-retardant mechanism of PA6/OP1314/DOPO-SiO 2 was also investigated by Fourier transform infrared spectroscopy FTIR at different temperatures and the pyrolysis products were investigated by pyrolysis gas chromatography/ mass spectrum (Py-GC/MS). It was assumed that DOPO-SiO 2 and the hypophosphite of OP1314 possess excellent flame retardancy during the gaseous phase. Meanwhile, melamine and phosphate reacted with the pyrolytic products of PA6 to protect the matrix during the condensed phase. © 2015 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2016 , 133 , 42932.
研究领域:
材料科学
·
高分子化学
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DOI
高影响因子
SCIENCE OF THE TOTAL ENVIRONMENT
·
2022
·
IF 10.753
Qiao Li,Xinyue Ma,Chengsi Qi,Rui Li,Wei Zhang,Jiansheng Li,Jinyou Shen,Xiuyun Sun
Effective removal of Sb(III) and Sb(V) has long been an urgent task for protecting human health and environment. In this study, novel magnetic mesoporous Fe Mn binary oxides (MMFMs) were fabricated via calcinating the Mn encapsulated carboxymethyl cellulose-Fe(III) hydrogel, and the structure of MMFMs were closely related to the Fe:Mn ratio. Owing to the mesoporous structure together with synergistic effect of Fe Mn binary component, the MMFMs exhibited excellent mass transfer and adsorption ability to Sb(III) and Sb(V). MMFM 3 achieved a maximum Sb(III) and Sb(V) adsorption capacity of 281.5 and 204.6 mg/g, respectively. Co-existing anions of Cl − , NO 3 − and SO 4 2− exhibited marginal influence on the adsorption for both Sb(III) and Sb(V), except the PO 4 3− for Sb(III) and SiO 3 2− or PO 4 3− for Sb(V). X-ray photoelectron spectroscopic investigation revealed that high valence Mn(IV) was mainly responsible for the oxidation transformation of the highly toxic Sb(III) into less toxic Sb(V), while the FeO x content played major role for the adsorption of Sb(V). The generated inner-sphere Fe O Sb complex between Fe-OH groups and Sb(III/V) dominantly contributed to the removal of Sb(III/V). Overall, mesoporous structure, magnetic separation ability, excellent adsorption performance together with exceptional regeneration properties demonstrated the great potential of MMFMs for Sb(III/V) remediation.
研究领域:
环境科学
·
材料科学
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DOI
PubMed
高影响因子
BIORESOURCE TECHNOLOGY
·
2022
·
IF 11.889
Liping Zhang,Yingbo Dong:,Junfei Liu,Wei Liu,Yanrong Lu,Hai Lin
Iron-loaded porous biochar (FPBC) was synthesized by co-pyrolysis method using sawdust and potassium ferrate at 500 (FPBC500) and 800°C (FPBC800), then characterized and applied to eliminate antimonite (Sb(III)) and antimonate (Sb(V)) in aqueous. Due to alkali erosion on feedstock and K/Fe-oxides attacking carbon, FPBC800 obtained a larger specific surface area (SSA) (515.49 m 2 ·g −1 ) that was 5.48-fold that of PFBC500, meaning the exposure of more active sites. Fe 3 O 4 was formed on FPBC500, but Fe 0 and Fe 3 C were generated on FPBC800. FPBC800 showed the optimal sorption performance for Sb(III) (144.48 mg·g −1 ) and Sb(V) (45.29 mg·g −1 ), which were much higher than that of FPBC500. Noteworthily, Sb(III) anchored on FPBC was oxidized to Sb(V) with less ecotoxicity; moreover, FPBC800 with Fe 0 showed stronger oxidization. Although pH-dependent sorption of Sb(III)/Sb(V) on FPBC occurred, the resistance to environmental factors showed a potential for eliminating actual pollution, demonstrating an easy-to-operate construction strategy for modified biochar.
研究领域:
环境科学
·
材料科学
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DOI
PubMed
高影响因子
POLYMERS FOR ADVANCED TECHNOLOGIES
·
2021
·Vol. 32
·期 9
·3515-3522
·
IF 3.665
Yifan Xiao,Jiaxuan Li,Jun Wu,Liang Song,Yuxi Han,Zhongwei Wang,Qing Yu
Glass fiber reinforced polyethylene terephthalate (PET/GF) with enhanced flame retardancy was prepared with few-layer black phosphorus (BPs) for the first time. The performance of red phosphorus (RP) modified PET/GF was also investigated for comparison. Results show that PET/GF with 0.9 wt% BPs (PET/GF@BP-0.9) can eliminate the ignition of cotton by dripping. The addition of 2.7 wt% of BPs can make the PET/GF sample pass UL 94 V-0 classification, while a much higher of 6.3 wt% RP was needed to pass the same classification. Compared with neat PET/GF, the peak heat release rate (PHRR) and total heat release (THR) rate of PET/GF@BP-2.7 decreases ca. 52.5% and 34.8%, respectively. The studies of char residues reveal that BPs could act as a catalyst for char formation and the formed char could roughen the surface of GF and thus restrain the “wick effect.” Thermogravimetric analysis/infrared spectrometry shows that the addition of BPs significantly inhibited the release of gas-phase products. The attractive abilities of BPs as flame retardant provide a novel and effective way of PET/GF modification.
研究领域:
材料科学
·
化学工程
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DOI
高影响因子
CHEMOSPHERE
·
2018
·
IF 4.427
Li Li,Jun Huang,Xuebin Hu,Sai Zhang,Qin Dai,Hongxiang Chai,Li Gu
Sodium percarbonate (SPC)-based advanced oxidation process has been applied to the wastewater treatment in recent years. In the present study, a novel catalyst utilization of vanadium(V) was investigated for the activation of SPC for aniline degradation. The mechanism of SPC activation by V(IV) was demonstrated, and the major free radicals were identified through scavenging tests and electron paramagnetic resonance (EPR) analysis. The performance of aniline degradation was evaluated in the V(IV)/H 2 O 2 and V(IV)/H 2 O 2 /Na 2 CO 3 systems and compared with that of the V(IV)/SPC system. The influences of initial pH and effects of inorganic anions were also studied. The results show that aniline could be decomposed efficiently by SPC activated with V(IV) and the degradation efficiency increased with the increase in V(IV) and SPC dosage. O 2 − , CO 3 − , and OH were found to participate in aniline degradation, and O 2 − and CO 3 − were confirmed to be the predominant species. The decomposition of aniline was enhanced when equal amount of H 2 O 2 was utilized instead of SPC under acidic condition while a comparative behavior was achieved in the V(IV)/H 2 O 2 /Na 2 CO 3 system. Furthermore, aniline degradation was not impacted significantly by the initial pH and addition of Cl − , SO 4 2− and NO 3 − , while HCO 3 − led to a betterment of aniline removal. These results indicate that the V(IV)/SPC system is an effective and promising approach for the removal of aniline from water for its feasibility and stability, which achieves eliminating contaminants by another waste.
研究领域:
环境科学
·
化学工程
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DOI
PubMed
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2023
·Vol. 140
·期 46
·e54674
·
IF 3
Yingting Yin,Mao Feng,Wei Li,Jinbo Yao,Jiarong Niu
To improve the flame retardancy and solid content of waterborne polyurethane (WPU), AOT, and AOD series of WPU were synthesized and characterized. Carboxylic acid/nonionic composite units were used as hydrophilic groups, and OP550/THPO and OP550/DOPO-HQ combinations were used as flame retardant modifiers, respectively. The results revealed that the flame retardant-modified WPU emulsions still had excellent dispersion, stability, and fluidity. The UL-94 rating of modified WPU could reach V-0, and the AOD series samples had better flame retardancy than the AOT series, where AO 10 D 3 -WPU containing 3% DOPO-HQ had an limiting oxygen index value up to 30.5%. Besides, the peak heat release rate and total heat release of AO 10 D 3 -WPU were respectively decreased by 32% and 34%, compared with the control sample in the conical calorimetric test. The TGA, TG-IR, and SEM-EDS exhibited that the flame retardants functioned in the condensed phase by promoting carbon formation. The tensile strength of AOT series samples was excellent with a range of 15.84–27.47 MPa, while the elongation at break of AOD series samples was relatively high with a distribution of 850.8%–913.11%, which could be selected to suit the needs of different application scenarios.
研究领域:
材料科学
·
高分子化学
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产品关联
DOI
高影响因子
Journal of Environmental Chemical Engineering
·
2024
·
IF 7.4
Shengguo Zhang,Xiaodong Wang,Qiuye Li,Jianjun Yang
In this paper, V-Mo co-doped akaganeite (β-FeOOH) was prepared by one-pot hydrothermal method and the oxidative desulfurization (ODS) of dibenzothiophene over the catalyst was carefully investigated. 0.07 g (ca. 0.35 wt% of model oil) of catalyst induced 100 % of DBT removal in 60 min with a O/S of 20:1 under 60 °C for the model oils with any of the sulfur contents, 100 ppm, 500 ppm, or 1000 ppm. Moreover, the DBT removal after recycling 4 times is still 100 % and it only declines to 98.04 % in the fifth cycle, which indicates that the catalyst has a good stability and recycling performance. Doping V species in Mo doped β-FeOOH not only initiates a micro-variation in catalyst structure and the resultant more active •OH species but also forms a more stable structure of the catalyst, enabling the catalyst to exhibit a higher ODS reaction rate and a better reusability. The GC-MS analyses demonstrated that the DBT was converted to DBTO 2 by two steps: (1) DBT→ DBTO; (2) DBTO→ DBTO 2 , and the former is the rate-limiting step.
研究领域:
化学工程
·
催化材料
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DOI
高影响因子
Small Methods
·
2019
·Vol. 3
·期 11
·1900356
·
IF 0
Tongwei Wu,Wenhan Kong,Ya Zhang,Zhe Xing,Jinxiu Zhao,Ting Wang,Xifeng Shi,Yonglan Luo,Xuping Sun
As a sustainable alternative technology to the Haber–Bosch process, electrochemical N 2 reduction offers the hope of directly converting N 2 to NH 3 at ambient conditions. However, its efficiency greatly depends on screening high-active electrocatalysts for the N 2 reduction reaction (NRR). Here, the recent experimental finding that V is an effective dopant to greatly improve the NRR performances of TiO 2 toward ambient N 2 -to-NH 3 fixation with excellent selectivity is reported. In 0.5 m anhydrous lithium perchlorate, V-doped TiO 2 nanorods attain a high Faradic efficiency of 15.3% and a large NH 3 yield of 17.73 µg h −1 mg cat. −1 at −0.40 and −0.50 V versus reversible hydrogen electrode, respectively, rivaling the performances of most reported aqueous-based NRR electrocatalysts. Density function theory (DFT) calculations are performed to gain further insight into the catalytic mechanism.
研究领域:
材料科学
·
化学工程
·
理论计算
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DOI
ACS Applied Energy Materials
·
2024
·
IF 5.4
Shuaishuai Chen,Hua Li,Yihan Tang,Jingkun Yan,Zhaoxin Lu,Yi Wan,Chun Jiang,Xiaoyi Wang,Xiong Zhao,Zhenlian Chen,Jiliang Wu,Deyu Wang
Bulky substitutions with transition-metal elements are widely used to improve the comprehensive performance of ternary oxide cathodes. As the Ni content increases to 90% and higher, the modification strategies should be reconsidered since the regular remedies have difficulty addressing their inherent drawbacks. Here, we propose the influence of vanadium substitution, which is rarely used in bulky substitution. This modification obviously improves the durability of LiNi0.90Co0.05Mn0.05O2 at high rate and slightly lowers its reversible capacity. As the best sample, the 2% V-substituted sample delivers 174.4 mA h/g in the first cycle and still maintains 72.5% in the 200th cycle under 5 C, respectively. This variation should be dependent on the abated Δc during operation and the enhanced Li+ diffusion coefficient. Furthermore, the ameliorated mechanical behavior is further proved by the intact particles of the 2% V-substituted sample after 200 cycles. Our results demonstrate that vanadium substitution should be one of the potential strategies to modify Ni-rich materials due to their complementarity.
研究领域:
材料科学
·
电化学
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产品关联
DOI
高影响因子
ADVANCED FUNCTIONAL MATERIALS
·
2024
·
IF 18.5
Liu Gao,Fujie Li,Guangrong Zeng,Xin Jin,Zhenyou Li,Chao Wang
Elevating the charging cut-off voltage is an effective strategy to increase the energy density of LiCoO 2 . However, unstable interfacial structures and unfavorable phase transitions in bulk are inevitably triggered during deep de-lithiation at high voltage. Herein, an integrated surface-to-bulk Ti-modification strategy is applied to LiCoO 2 , enabling uniform Li 2 TiO 3 coating on the surface and gradient Ti-doping toward the structural bulk. The resultant Ti-modified LiCoO 2 (T-LCO) electrode can be stably cycled up to 4.6 V, providing a high-rate capability of 137 mAh g −1 at 5C and a long-life stability with 80.5% capacity retention after 400 cycles at 1C, far outperforming the unmodified LiCoO 2 electrode with only 50.7% capacity retention. In situ X-ray diffraction characterization and density functional theory calculation reveal that the synergistic modification of T-LCO enhances Li + diffusion, facilitates the construction of high-quality cathode/electrolyte interphase, reduces the phase transition from O3 to H1-3 and Co3d/O2p band overlap, and restrains layer-to-spinel phase distortion, thus improving structural stability at 4.6 V. This work presents a “two birds one step” strategy to enhance the cycling stability and achievable capacity of high-voltage LiCoO 2 for developing high energy density lithium-ion batteries.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
Catalysts
·
2026
·Vol. 16
·期 2
·188
·
IF 4.5
Lian Yi,Qiulin Chen,Wen Zhang,Rongshu Zhu
The construction of Z-scheme heterojunctions is regarded as one of the most effective modification strategies for photocatalysts. However, how to improve the interfacial charge transfer efficiency to further enhance the photocatalytic activity remains an urgent issue to be addressed. In this study, sulfur vacancy-enriched ZnIn2S4/MoS2Z-scheme heterojunctions (V-ZIS/MS) containing interfacial Mo-S bonds was successfully synthesized using a hydrothermal method. The V-ZIS/2%MS showed the highest hydrogen evolution rate, achieving 19.21 ± 0.78 mmol·g−1·h−1under visible light and 112.89 ± 10.98 mmol·g−1·h−1under full-spectrum illumination, which are 5.07 and 4.41 times higher than ZIS (3.79 ± 0.79 mmol·g−1·h−1) and V-ZIS (4.36 ± 0.98 mmol·g−1·h−1) under visible light, respectively, outperforming most reported ZIS-based photocatalysts. This is because the composite of V-ZIS and MS enhanced its light absorption performance. More importantly, the formation of Mo-S bonds at the V-ZIS/MoS2interface facilitated efficient charge transfer and reduced interfacial resistance, leading to significantly improved photocatalytic activity. Cycling experiments further demonstrate that V-ZIS/2%MS exhibits considerable photocatalytic stability. X-ray diffraction analysis before and after the reaction further confirmed the structural stability of the catalyst. This work provides a certain reference for the preparation of high-performance ZIS-based photocatalysts.
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DOI
高影响因子
ACS Nano
·
2026
·Vol. 20
·期 31
·21975-21983
·
IF 17.3
Li Zhaohui,Dai Chunlong,Li Yi,Wang Fei,Xiang Yuhao,Ding Yu,Xue Tong,Zhang Tong,Ran Lei,Hu Linyu,Xu Maowen
Selenium (Se) is an attractive cathode candidate for
rechargeable
batteries owing to its high theoretical capacity and favorable electronic
conductivity. However, conventional Se batteries relying on alkali
metal-ion charge carriers are plagued by low operating voltages (<2.1
V), sluggish kinetics, and polyselenide shuttling. In this study,
we extend copper-ion-mediated selenium electrochemistry from aqueous
systems to nonaqueous electrolytes by identifying a Cu(ClO 4 ) 2 /carbonate electrolyte that enables reversible Cu-mediated
Se conversion. The copper-ion mediation mechanism produces insoluble
and highly conductive Cu x Se intermediates,
which effectively suppress polyselenide dissolution and shuttling
while enabling rapid reaction kinetics, as reflected by the low polarization
of ∼0.1 V. Moreover, this approach elevates the selenium redox
potential from below −0.5 V to +0.5 V vs SHE, enabling a hybrid
lithium–selenium battery with a 3.5 V discharge voltage, compared
to ∼2.0 V in conventional alkali metal-Se systems. This work
demonstrates the feasibility of implementing Cu-mediated selenium
electrochemistry in nonaqueous media and achieves a high-voltage Se-based
battery.
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产品关联
DOI
PubMed
高影响因子
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