COMPOSITES PART B-ENGINEERING
·
2019
·
IF 6.864
Xianghua Wu,Xing Yang,Hu Yang,Zeping Guo,Jinpei Lin,Wei Wu,Xiaoguang Liang,Yun He
Composite fibers synthesized via the electrospinning technique have been extensively investigated as the adsorbent for the volatile organic compounds (VOCs) because of their synergistic effect . Herein, the novel hierarchically structured polyvinylpyrrolidone (PVP) porous fibers embedded with microporous NaY zeolite are fabricated by employing the electrospinning method . The parameters such as the electrospinning voltage and flow rate as well as the particle sizes of NaY zeolite are optimized further for the preparation of composite fibers featured with homogeneous morphology and superior property. Consequently, the composite fibers with large specific area synthesized under the optimized process present an excellent benzene adsorption capacity of 667 mg/g, which can be attributed to synergistic effect originated from the hierarchical structure configured with porous PVP and microporous NaY zeolite. Our work does not only demonstrate the promising potential of the as-fabricated composite fibers for VOCs due to its advantages of low cost and large-scale production, but also provides valuable insights into the design and utilization of zeolite/polymer composite fibers for practical applications.
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2023
·
IF 15.1
Juntao Tang,Mengying Fu,Yidan Mao,Shuyi Yang,Wei Lin,Yan Yu,Shuang Song
Photocatalysis is regarded as a promising in situ air purification technology for the removal of volatile organic compounds. However, the deactivation of photocatalysts remains a serious issue that needs to be addressed. Herein, we report a novel dual-functional photocatalyst (TiO 2 @HYZ) with spatially separated catalytic sites and adsorption sites, which has been obtained by combining hydrophilic {0 0 1} TiO 2 nanosheets with hydrophobic NaY zeolite. TiO 2 @HYZ showed excellent photocatalytic activity for the degradation of gaseous toluene under UV irradiation in humid air. The optimized TiO 2 @HYZ-2 (containing 45.7 wt% TiO 2 ) achieved 96.6% toluene removal and 87.4% mineralization within 120 min. The specific reaction rate constant of TiO 2 @HYZ-2, pristine TiO 2 and P25 normalized by the unit amount of TiO 2 during the photocatalytic degradation process were calculated to be 0.481, 0.230 and 0.250 min −1 g −1 , respectively. Moreover, TiO 2 @HYZ-2 showed superior durability, maintaining stable performance over repeated toluene degradation processes, even at high toluene concentration, whereas pristine TiO 2 incurred severe deactivation with increasing number of photocatalysis cycles. The significantly enhanced activity and anti-deactivation property was attributed to a synergistic effect between HYZ and TiO 2 in the catalyst structure, which strengthened the adsorption of toluene on HYZ and facilitated effective separation of photoexcited charge carriers on TiO 2 , thus avoiding the deposition of degradation intermediates on the active sites and simultaneously improving mineralization. This work provided a new perspective for the design of efficient and deactivation-resistant photocatalysts for air pollution remediation.
研究领域:
环境科学
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材料科学
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2022
·
IF 16.744
Yushan Li,Qingqing Xie,Mengyu Wang,Zhenyang Wang,Jiefeng Liu,Yiyao Du,Dongpei Zhang,Mengyuan Liu,Guangyu Zhang,Xin Jin,Chaohe Yang
Solketal is known as a promising non-BPA plasticizer . However, fast and robust synthesis of solketal from bio-oxygenates remains a grand challenge, as strong surface polarization often deactivates acidic catalysts. We proposed and validated a dual designing strategy, involving (1) Fe 3+ modified Bronsted acidity and (2) chlorotrimethylsilane (CTS) altered hydrophilicity for enhanced activity and stability of NaY catalysts. As one of the key findings, Fe 3+ exchanged NaYs display an unusual shortened Si-OH bond and electronically reconfigured Fe 3+ sites for a 4-fold activity enhancement. Furthermore, CTS modified FeY materials further alleviate surface passivation of glycerol and water, leading to an 18-fold activity improvement and better durability for acetalization of glycerol. CTS modified FeY catalysts display remarkable stability against varies impurity molecules. The dual modification methodology provides useful information on rational design of durable catalysts for synthesis of various other non-BPA derivatives.
研究领域:
催化化学
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绿色化学
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材料科学
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2020
·
IF 10.652
Aihu Feng,Le Mi,Yang Yu,Yunzhen Cao,Yun Yu,Lixin Song
Volatile organic compounds have seriously affected the natural environment and human health, and adsorption is one of the most effective method for controlling VOCs pollution. In this work, the NH 4 HF 2 -etched NaY-s-x zeolites with intracrystalline mesoporosity are obtained via the surfactant-templating process in weak base NH 4 OH solution. The morphology, microstructure, and toluene adsorption property of as-prepared hierarchical Y zeolites are systematically characterized. It is found that the structural and textural properties of NH 4 HF 2 -etched NaY samples are significantly changed by the simple surfactant-templated approach and the large-sized mesopores inside NH 4 HF 2 -etched NaY sample disappear to form the surfactant-templated mesoporosity with a size of ~4 nm. It is demonstrated that the intracrystalline mesoporosity obviously improves the toluene molecular adsorption properties of zeolite samples. Moreover, the mechanism of the surfactant-templating process is elucidated.
研究领域:
材料科学
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环境科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
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2024
·Vol. 35
·期 18
·1251
·
IF 2.8
Zheng Jinjie,Shen Honglie,Li Yufang,Li Hechao,Yue Zhen
Novel efficient visible and near-infrared emitting phosphors NaY(MoO 4 ) 2 (NYM):Ln 3+ (Ln = Ce and Yb) were proposed in this work. The crystal structure, lattice vibration characteristics, morphology, and luminescent properties of NaY(MoO 4 ) 2 phosphors were described. Sensitization of Ln 3+ from the host with various doping concentrations was investigated. The yellow-green emission was achieved in Ce 3+ single-doped NYM phosphors at UV ultraviolet excitation sensitized by the MoO 4 2− group. Under UV excitation, characteristic emissions of Ce 3+ at 400–700 nm and Yb 3+ at 1000 nm of NYM:Ce,Yb were observed, enabling the spectral down-conversion applications. With the increasing concentration of Yb 3+ , the emission intensity as well as the lifetime of Ce 3+ decreased, confirming the energy transfer from Ce 3+ ions to Yb 3+ ions. And the energy transfer coefficient was 27% for NYM:0.01Ce,0.10Yb phosphor. These results indicate that the as-prepared phosphors have potential applications in optical and photonic devices.
研究领域:
材料科学
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光学材料
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发光学
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无机化学
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光子学
✓ 已验证
DOI
高影响因子
MICROCHEMICAL JOURNAL
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2019
·
IF 3.206
Chi Chen,Zhuang Fu,Weiying Zhou,Qiushi Chen,Chenzhao Wang,Lu Xu,Zhibing Wang,Hanqi Zhang
The ionic liquid-immobilized NaY zeolite was prepared by means of impregnation approach and used as the dispersant of matrix solid phase dispersion for the extraction of aloe-emodin, emodin, chrysophanol and physcion in Rheum palmatum L.. High performance liquid chromatography coupled with diode-array detection was used for the separation and determination of target analytes. The ionic liquid-immobilized NaY zeolite was further characterized by SEM, FT-IR, TG, XRD and BET. The experimental parameters, such as type and content of ionic liquid, mass ratio of sample to dispersant, type of washing solvent, and type and volume of elution solvent, were optimized. The results revealed that the prepared ionic liquid-immobilized NaY zeolite presents suitable properties and can be used as the dispersant of matrix solid phase dispersion for the extraction of anthraquinones. Good linearities ( r > 0.9995) were obtained in the range of analyte concentration investigated. The recoveries were 73–98% with the relative standard deviations lower than 6%. Compared with ultrasound-assisted extraction and heat reflux extraction, the present method requires less sample, organic solvent and extraction time. The present method can be applied to the determination of anthraquinones from medicinal plant.
研究领域:
分析化学
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药学
✓ 已验证
产品关联
DOI
高影响因子
ENVIRONMENTAL SCIENCE & TECHNOLOGY
·
2024
·
IF 10.8
Yibing Xie,Xueqian Wang,Zan Qu,Ping Ning,Langlang Wang,Haomiao Xu,Wenjun Huang,Jichang Lu,Jianfei Luo
The transformation of toxic arsine (AsH3) gas into valuable elemental arsenic (As0) from industrial exhaust gases is important for achieving sustainable development goals. Although advanced arsenic removal catalysts can improve the removal efficiency of AsH3, toxic arsenic oxides generated during this process have not received adequate attention. In light of this, a novel approach for obtaining stable As0 products was proposed by performing controlled moderate oxidation. We designed a tailored Ni-based catalyst through an acid etching approach to alter interactions between Ni and NaY. As a result, the 1Ni/NaY-H catalyst yielded an unprecedented proportion of As0 as the major product (65%), which is superior to those of other reported catalysts that only produced arsenic oxides. Density functional theory calculations clarified that Ni species changed the electronic structure of oxygen atoms, and the formed [NiIII–OH (μ-O)] active centers facilitated the adsorption of AsH2*, AsH*, and As* reaction intermediates for As–H bond cleavage, thereby decreasing the direct reactivity of oxygen with the arsenic intermediates. This work presents pioneering insights into inhibiting excessive oxidation during AsH3 removal, demonstrating potential environmental applications for recovery of As0 from toxic AsH3.
研究领域:
环境科学
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催化化学
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材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
FUEL
·
2023
·
IF 7.4
Siqi Wu,Rong Guo,Jianshan Chen,Runping Ye,Yeyan Qin,Hanying Wu,Shanshan Zong,Yang Liu,Yuangen Yao
Lack of high performance and stability catalysts remains a technical bottleneck for the industrialization of methyl nitrite (MN) carbonylation to dimethyl carbonate (DMC). Lewis acidity is crucial for catalytic performance in MN carbonylation reaction, but the regulation of Lewis acid sites and the effects of Lewis acid strength on catalytic performance have not been clarified. Thus, rational design of NaY zeolites with controllable acidity is an effective strategy to promote their catalytic performance. Herein, we substituted Ga for partial framework Al to produce a series of NaGaY-x (x = 0 ∼ 2) zeolites with different Ga content via direct hydrothermal method and applied in this reaction. The results showed that the Lewis acid strength increased upon an appropriate amount of Ga incorporation, thereby the electron density of Pd 2+ could be regulated. The optimal electron density of Pd 2+ promotes the carbon monoxide (CO) adsorption and activation, which contribute to the formation of the critical intermediate species *COOCH 3 . Eventually, the Ga-modified PdCu/NaY catalyst exhibited remarkable catalytic activity for MN carbonylation to DMC with the weight-time yields (WTY DMC ) of 1251 g·kg cat −1 ·h −1 , and the CO conversion to DMC (C CO ) of 69.2 % as well as the DMC selectivity based on CO (S DMC/CO ) up to 100 %. Our work paves the way to further understand the synergistic effect between Pd 2+ and Lewis acid, assists in the development of high-performance MN carbonylation catalysts.
研究领域:
催化化学
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材料科学
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2022
·
IF 16.744
Huijuan Liu,Keyan Wei,Chao Long
Y zeolite with high specific surface area and peculiar microporous channels has been regarded as a promising adsorbent in volatile organic compounds (VOCs) control. However, a scalable strategy for improving the hydrophobicity and mass diffusion of Y zeolite to remove VOCs remains a challenge. In this study, we successfully synthesized two NaY@ meso -SiO 2 core–shell composites with different shell thicknesses by coating NaY zeolite with mesoporous SiO 2 (NaY@ meso -SiO 2 -0.8 and NaY@ meso -SiO 2 -1.2), which significantly improved the hydrophobicity of NaY zeolite and diffusion of VOCs into NaY zeolite. The results of XRD, SEM, TEM, FTIR and BET confirmed the successful synthesis of core–shell composites. The adsorption equilibrium experiments showed that coating NaY zeolite with mesoporous SiO 2 effectively enhanced the hydrophobicity of NaY zeolite. Under RH = 0, the adsorption capacity of pristine NaY zeolite was the highest; while under RH = 50%, NaY@ meso -SiO 2 -1.2 exhibited stronger adsorption ability and excellent hydrophobicity. The adsorption diffusion indicated that coating NaY zeolite with mesoporous SiO 2 remarkably promoted the diffusion of VOCs into composites. Compared with the pristine NaY, core–shell composites showed higher diffusion coefficients and lower diffusion activation energy under RH = 0, particularly NaY@ meso -SiO 2 -1.2. In addition, linear solvation energy relationships (LSERs) revealed that π-/n-electron pairs interaction became weak and dipolar interactions were enhanced when water was adsorbed on the surface of NaY@ meso -SiO 2 -1.2. Hydrogen bonding decreased when RH level reached 50% and then increased with the increase of RH from 50% to 90%.
研究领域:
环境科学
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材料科学
✓ 已验证
产品关联
DOI
高影响因子
CHINESE JOURNAL OF CHEMICAL ENGINEERING
·
2023
·
IF 3.8
Meihua Zhu,Xingguo An,Tian Gui,Ting Wu,Yuqin Li,Xiangshu Chen
Pervaporation performance of NaY zeolite membranes is improved by ion-exchange with di-valent nitrate salt . Different nitrate salts, including Co(NO 3 ) 2 , Mg(NO 3 ) 2 , Zn(NO 3 ) 2 , Ca(NO 3 ) 2 , Cu(NO 3 ) 2 , KNO 3 , and AgNO 3 , have great effects on the channel structure and water affinity of the NaY zeolite membrane. When the concentration of nitrate salt, ion-exchange temperature and time are 0.1 mol·L −1 , 50 °C and 2 h, the ion-exchange degree order of NaY zeolites is Ag + > K + > Ca 2+ > Zn 2+ ≫ Co 2+ > Mg 2+ . Especially, Ag + and K + cation exchange degree of NaY zeolites are achieved to 96.54% and 82.77% in this work. BET surface, total pore capacity, pore size distribution and water contact angle of the ion-exchanged NaY zeolites are all disordered by mono- and di-valent cations. Di-valent nitrate salt is favor for increasing the dehydration performance of NaY zeolite membranes by ion-exchange. When the ion-exchange solution is Zn(NO 3 ) 2 , the total flux variation and separation factor variation of the NaY membrane (M-5) are −45% and 230% for separation of 10% (mass) H 2 O/EtOH mixture by pervaporation, and the ion-exchanged membranes showed good reproducibility.
研究领域:
材料科学
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膜分离技术
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无机非金属材料
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化学工程
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纳米材料
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吸附与扩散
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界面化学
✓ 已验证
DOI
高影响因子
HELVETICA CHIMICA ACTA
·
2025
·
IF 1.8
Sendaner Adelieti,Si-Qi Wu,Xian-Hao Wu,Rong Guo,Jian-Shan Chen,Zhi-Fang Diao,Zi-Yi Miao,Zhen-Hong Han,Ye-Yan Qin,Yuan-Gen Yao
The carbonylation of methyl nitrite (MN) to synthesize dimethyl carbonate (DMC) is a promising route, but the lack of efficient and stable catalysts remains a major challenge for large-scale applications. In this study, by adjusting the alkalinity of the initial gel, NaY zeolites with tunable acidity were synthesized, and the amount of Lewis acid sites was optimized. Appropriate amounts of Lewis acid sites facilitated the interaction between NaY zeolites and Pd species, which was beneficial for stabilizing the oxidation state of Pd and promoting CO adsorption and activation, thereby contributing to the formation of the key intermediate *COOCH3. The catalyst PdCu/NaY-1 (alkalinity in the initial gel Na2O = 9) exhibited significant improvement in catalytic performance for the synthesis of DMC, with the WTYDMC of 1604 g·kgcat-1·h-1, the conversion of CO to DMC (CCO) of 88.7%, and the DMC selectivity based on CO (SDMC/CO) up to 100%.
研究领域:
催化化学
·
材料科学
·
绿色化学
✓ 已验证
产品关联
DOI
高影响因子
MICROPOROUS AND MESOPOROUS MATERIALS
·
2019
·
IF 4.182
Meihua Zhu,Shiming Huang,Yudan Gong,Yunyan Zhou,Xinyu Chen,Yongsheng Liu,Na Hu,Fei Zhang,Xiangshu Chen,Hidetoshi Kita
Good separation performance NaY zeolite membrane was successfully prepared on the tubular mullite support by fluoride-containing precursor synthesis gel. The fluoride source had a great influence on NaY zeolite membrane growth and separation performance for EtOH/ETBE mixture, the NaF containing precursor gel was benefit for preparing high Si/Al ratio, fine reproduction quality and long-term stable NaY zeolite membrane. Solid state 19 F MAS NMR characterization results indicated that the fluorine existed in the channel of NaY zeolite crystals. Both flux and separation factor of the NaY zeolite membrane were greatly depended on the separation temperature and composition of EtOH/ETBE mixtures. The NaY zeolite membrane presented eminent long-term stability for separating 20 wt% EtOH/ETBE mixture at 60 °C, even if the test time was prolonged to 80 h, the flux and separation factor were kept 1.30 kg m −2 h −1 and 1100.
研究领域:
材料科学
·
膜分离技术
·
化学工程
·
无机非金属材料
·
功能材料
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）