JOURNAL OF NANOPARTICLE RESEARCH
·
2022
·Vol. 24
·期 12
·1-14
·
IF 2.533
Lu Junfeng,Li Donglin,Chen Xianjia,Peng Xiaolin,Li Jing,Yang Yanting,Hong Bo,Wang Xinqing,Jin Dingfeng,Jin Hongxiao
Here, we demonstrate room temperature NO 2 sensors based on ZnO/rGO nanocomposites by a facile hydrothermal method. The ZnO nanoparticles (20 ~ 50 nm) were wrapped by film-like rGO with different contents (0.5, 1.0, 2.0, 3.0 wt %). They all exhibit p-type sensing toward NO 2 at room temperature. The content of rGO shows an obvious effect on the sensing properties. The ZnO NPs-1% rGO has a high response of 5.21 to 10 ppm NO 2 with a response/recovery time of 198/144 s. The sensing mechanism is discussed. The gas-sensitive properties are derived from the strong synergistic effect between the smaller particles of ZnO and rGO.
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KOREAN JOURNAL OF CHEMICAL ENGINEERING
·
2022
·Vol. 39
·期 11
·3039-3047
·
IF 3.146
Zhang Pan,Zhao Yuetong,Tian Xiangfeng,Ji Yanxi,Shu Yuxuan,Fu Kun,Fu Dong,Wang Lemeng
Tetramethylammonium glycine ([N 1111 ][Gly]) can be completely ionized into cation [N 1111 ] + and anion [Gly] - in aqueous solution. The anion contains an amino -NH 2 and a carboxyl -COO - , both of which can react with hydrogen sulfide (H 2 S). Therefore, [N 1111 ][Gly] was used to promote the selective absorption of H 2 S in coke oven gas (COG) by N-methyldiethanolamine (MDEA). The absorption performance and selectivity of H 2 S in the aqueous solution of MDEA-[N 1111 ][Gly] were investigated. The effects of MDEA mass fraction, [N 1111 ][Gly] mass fraction, temperature, H 2 S partial pressure and CO 2 partial pressure on the absorption capacity and selectivity were clarified. The results showed that an aqueous solution of MDEA-[N 1111 ][Gly] has good selectivity for H 2 S in COG. The absorption capacity was large and the mass fraction of the solute in the absorbent reached more than 0.55, thereby having outstanding advantages in the aspects of saving energy consumption and operating cost and having a good application potential.
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高影响因子
Journal of Bioresources and Bioproducts
·
2020
·
IF 0
Haibo Huang,Long Mao,Zhihan Li,Yuejun Liu,Shuhong Fan,Yao Jin,Jianda Xie
In this study, polypyrrole-silver coated layered double hydroxides (LDHs@PPy-Ag) was prepared by chemical polymerization of pyrrole (Py) with silver ions. Silver nanoparticles (AgNPs) could be uniformly reduced onto PPy coatings in situ by redox reaction during simultaneous polymerization process. And LDHs@PPy-Ag/poly(ε-caprolactone) (PCL) nanocomposites were fabricated by solution casting method. It is revealed that spherical AgNPs are loaded on PPy coatings uniformly. Particularly, compared with pure PCL, LDHs@PPy-Ag/PCL nanocomposites with incorporation of only 1 wt% LDHs@PPy-Ag show a 17% increase in tensile strength (36.5 MPa) and a 29% increase in elongation at break (822%). Upon PPy-Ag coatings onto original LDHs, oxygen relative permeability of LDHs@PPy-Ag/PCL nanocomposites decreases to 52% with the same addition. Meanwhile, due to the double antibacterial activity of PPy and AgNPs, the antibacterial rate of LDHs@PPy-Ag reaches 100%. And the corresponding LDHs@PPy-Ag/PCL nanocomposites also show outstanding antibacterial activity. Considering the superiority of their comprehensive performance, antibacterial LDHs@PPy-Ag/PCL nanocomposites can be used further for the application as biodegradable polymeric active packaging materials.
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JOURNAL OF MEMBRANE SCIENCE
·
2024
·
IF 8.4
Xi Chen,Zhenggang Wang,Zhuo Yang,Guozhen Liu,Guining Chen,Gongping Liu,Xiuxia Meng,Naitao Yang,Wanqin Jin
Towards natural gas purification , polymeric membranes generally face challenges of trade-off between permeability and selectivity , as well as CO 2 -induced plasticization effect. Previous works demonstrated that incorporating high-performing nanofillers and crosslinking the polymers are effective methods to overcome these two issues, respectively. In this work, we aimed to simultaneously improve permeability, selectivity and plasticization resistance of polymeric membranes by incorporating surface-engineered nanoporous fillers for CO 2 /CH 4 separation. DD3R zeolite nanoparticles with high purity were synthesized and then surface-functionalized by 3-aminopropyl trimethoxysilane (APTMS) to serve as the filler. Mixed-gas permeation measurements showed that DD3R zeolites offered CO 2 -selective channels in 6FDA-DAM polyimide based on molecular sieving effect of zeolitic aperture. 30 wt% DD3R-APTMS zeolite imparted the membrane with CO 2 permeability of 1661 Barrer (increased by 71.7%) and CO 2 /CH 4 selectivity of 28.0 (increased by 44.5%), which was beyond the upper-bound of polymeric membranes. Meanwhile, the hydrogen bond interaction between amino groups on APTMS and carboxyl groups on 6FDA-DAM rendered the resulting DD3R-APTMS MMMs highly enhanced plasticization resistance over 40 bar when equimolar CO 2 /CH 4 mixture as the feed. This work demonstrates a facile approach to simultaneously enhance separation performance and mitigate the plasticization effect.
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Journal of Materials Chemistry C
·
2024
·
IF 5.7
Xuehao Guo,Xiulian Fan,Xilong Zhou,Wenlong Chu,Chenyang Niu,Liqi He,Shizhen Bin,Yu Zhou
Group-IVB transition metal dichalcogenides such as HfS2 and ZrS2 demonstrate the most promising the semiconducting properties, with moderate band gaps and high predicted carrier mobilities. However, lateral growth of large domain-size single crystalline ZrS2 nanosheets still lack to be developed, which limited various electronic and optoelectronic applications. Here, we report a new precursor strategy for the synthesis of large-sized 2D ZrS2 nanosheets with lateral orientations. The stable precursor volatilization of high melting point zirconium carbide was controlled by the assistance of remote gas-phase alkali halide, which avoid the high nucleation density and vertical orientation at the initial stage. The 2D ZrS2 nanosheets were regulated by adjusting the growth parameters with the lateral size up to 22 μm and thinnest thickness of 8 nm, exhibiting high crystalline qualities and uniform surface. Field effect transistors of 2D ZrS2 nanosheets exhibited n-type transport characteristics with high on/off ratio and reasonable carrier mobilities. Our new precursor and chemical design pave a way for the synthesis of high-performance Group-IVB transition metal dichalcogenides wafers.
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APPLIED CATALYSIS A-GENERAL
·
2024
·
IF 4.7
Chenyang Zhao,Yujia Liu,Yupeng Tian,Yahui Li,Junjie Feng,Wei Xu,Ning Shi,Zhe Yang,Bing Sun
Direct epoxidation of propylene (C 3 H 6 ) with hydrogen (H 2 ) and oxygen (O 2 ) over Au/TS-1 catalyst was promising way for the synthesis of propylene oxide (PO). However, high selectivity of PO (>95 %) and conversion of C 3 H 6 (>5 %) cannot be achieved at the same time. The industrialization process was severely restricted. In this paper, Au/TS-1 catalysts were synthesized by deposition precipitation method with alkali metal promoter. And alkaline gases and silane coupling post-treatment were performed to promote the catalytic activity. The prepared samples exhibited a much better C 3 H 6 conversion (6.5 %) and PO selectivity (95.1 %) compared with general catalyst using normal synthetic technology. Cs 2 CO 3 was beneficial to increasing Au nanoparticles uptake efficiency. Both NH 3 and triethoxyvinylsilane post-treatment were good for smaller and more uniform loading of Au nanoparticles. The decreasing in surface hydroxyl density effectively alleviated the occurrence of PO ring opening isomerization. The increased hydrophobicity of TS-1 surface was conducive to the rapid desorption of generated PO and significantly increased PO selectivity. Multiple pretreatment was also favorable for extending the lifetime of Au/TS-1 catalyst.
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高影响因子
FUEL
·
2021
·
IF 6.609
Jiandong Hong,Yanfeng Zhao,Jiang Wu,Xialin Xie,Pengcheng Zhao,Shuai Li,Hong Yao,Guangqian Luo,Zhenhao Liu,Xin Yang
Calcium oxide (CaO), as a high temperature sorbent, has been widely applied in the field of heavy metal removal due to its low price and stable chemical properties, but CaO tends to sinter at high temperature, which affects the adsorption performance. In this work, Al 2 O 3 /CaO sorbent with resistance to sintering was synthesized via citric acid and calcine method, which was innovatively employed to the adsorption of As 2 O 3 combining experiment and theoretical analysis. The experimental results demonstrate that the adsorption capacity of untreated CaO reduces immensely with the temperature rising from 1073 to 1273 K, and arsenic adsorption capacity reduces from 303 to 50 mg/kg. Whereas, arsenic adsorption capacity of Al 2 O 3 /CaO almost maintains at high level and reaches to 534 mg/kg at 1173 K, which proves that the addition of Al 2 O 3 can improve the anti-sintering ability of CaO. Meanwhile, through density functional theory (DFT), the adsorption sites of Al 2 O 3 /CaO was further studied. Al site of Al 2 O 3 /CaO was found to be the main adsorption active site and electron transfer channel, which effectively facilitates the separation of lattice oxygen. Finally, the adsorption mechanism of As 2 O 3 on Al 2 O 3 /CaO was proposed.
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MICROPOROUS AND MESOPOROUS MATERIALS
·
2022
·
IF 5.876
Mingming Hu,Junjie Liu,Jingjing Kong,Peiyu Jia,Ning Qi,Yichu Wu,Zhiquan Chen,Shan Xu,Nanwen Li
In this work, a series of hydrolyzed polymers of intrinsic microporosity (PIMs) membranes were successfully synthesized under alkaline conditions. Positron annihilation lifetime measurement is employed to analyze the pore structure of the hydrolyzed PIMs. In the original PIM-1, there are two kinds of pores, i.e. micropores with radius of 4.32 Å and ultramicropores with radius of 2.58 Å. The size of all the pores shows a continuous decrease with increasing hydrolysis time, which is confirmed by the reduced chain-to-chain spacing in the hydrolyzed PIMs measured by X-ray diffraction. Meanwhile, the fractional free volume also shows decrease after the hydrolysis process, while the relative number of ultramicropores increases. Benefiting from the smaller pore size in the hydrolyzed PIMs membrane, the gas molecules with smaller size (such as CO 2 ) can be separated more efficiently. The selectivity of CO 2 /CH 4 of hydrolyzed PIMs reaches up to 30.05 with a relatively high CO 2 permeability of 140.58 Barrer, which exceeds the Robeson’s 1991 upper bound. Our results indicate that the hydrolyzed polymers of intrinsic microporosity membranes are promising candidates for gas separation membrane in the future.
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Analytical Methods
·
2014
·Vol. 7
·期 2
·560-565
·
IF 1.938
Yun-Kai Lv,Wei Zhang,Meng-Meng Guo,Fang-Fang Zhao,Xiao-Xue Du
A home-made centrifugal microextraction tube (CMET) was developed and applied to cloud point extraction coupled with microwave-assisted back extraction and gas chromatographic separation of six phthalate esters (PAEs) from mineral water. All phthalate esters were entrapped in the micelles of the non-ionic surfactant Triton X-114 and removed from the bulk phase by centrifugation. The obtained surfactant-rich phase was treated with water-immiscible solvents, and the target analytes were back extracted by short-term microwave application and determined by GC-FID directly. The whole process was finished in the CMET. The proposed method demonstrated good performance concerning linearity (R2 = 0.9977-0.9998), precision (2.3–5.7%), the limits of detection and quantitation (LOD, 11.5-19.3 μg L−1; LOQ, 37.0-63.3 μg L−1), spiked recoveries (89.1–96.3%) and enrichment factor (71-85). The proposed method was successfully applied for the determination of trace amount of phthalate esters in mineral water. DBP and BBP were found in actual mineral water samples.
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高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2025
·
IF 9.7
Qiufeng Liu,Kaihang Sun,Kun Lu,Xingwei Xie,Longzhou Zhang,Young Dok Kim,Zhongyi Liu,Zhikun Peng
Metal-support interaction (MSI) is an efficient strategy to modulate the distribution of active metal with different electronic states over the oxide-supported metal catalysts. However, the intrinsic correlation between the intensity of MSI and the electronic structure of supported metals remains inadequate. In this work, the intensity of MSI over the Cu/Y 2 O 3 catalyst was tuned by the calcination temperature, which regulated the distribution of Cu 0 , Cu + and Cu 2+ species. The Cu/Y 2 O 3 catalyst with the highest amount of Cu + exhibits the superior performance of reverse water–gas shift reaction. Due to the enhanced H 2 activation and promoted charge transfer at the interfacial Cu + /Y 2 O 3 site based on the experimental characterizations, the CO formation rate reached 220 mmol CO g cat −1 h −1 at 500 °C. The present work provides an efficient way to regulate the supported metal species with the specific electronic state.
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产品关联
DOI
PubMed
高影响因子
JOURNAL OF MOLECULAR STRUCTURE
·
2025
·
IF 4.7
Ge Zhu,Mengran Gao,Kejun Bi,Shanshan Zhao
The magnetic biochar is prepared for ciprofloxacin removal by adsorption, photocatalytic degradation and activation peroxodisulfate degradation. The magnetic biochar contains the ZnO, Fe 3 O 4 and FeNi with abundant pore structure, based on characterization analysis. According to Langmuir model analysis, the adsorption amount of ciprofloxacin is 505.16 mg/g. The adsorption mechanism analysis indicates that the surface functional group of magnetic biochar contributes to ciprofloxacin removal from wastewater. The magnetic biochar can be used as the photocatalyst for photocatalytic degradation of ciprofloxacin with removal of the 99.43 %. The ciprofloxacin can be also removed in the activation peroxodisulfate degradation system by reactive oxygen species. The magnetic biochar has excellent reusability in ciprofloxacin removal process. Bio-oil and bio-gas are produced by recycling of pyrolysis gas in the magnetic biochar preparation process. The bio-oil and bio-gas are rich in furfural and H 2 , respectively. Besides, the heating value of bio-gas is 12.35 MJ/Nm³.
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高影响因子
WOOD SCIENCE AND TECHNOLOGY
·
2025
·Vol. 59
·期 4
·1-25
·
IF 3
Ding Jiarong,Tian Shiyu,Hu Zewen,Zhao Aichen,Liu Yu,Zhu Xiaodong
Formaldehyde released from particleboard poses a serious threat to indoor air quality, and there is an urgent need to develop efficient adsorbents to reduce its release. This study introduces micro-nano chitosan (multiscale chitosan cross-linked polymers, MNCs) as a novel adsorbent, synthesized via ionic gelation and systematically characterized in terms of their specific surface area (0.301 m 2 /g), average particle size (19.96 μm), spherical morphology, and surface functional groups. The formaldehyde emission from particleboard treated with 3% MNCs was found to be reduced to 70.7% of that of the control group on day 28 by the 1 m 3 climate chamber experiment, which was a significant emission reduction effect. The adsorption kinetic analysis showed that the adsorption of formaldehyde by MNCs conformed to the pseudo-second-order adsorption kinetic model, and its chemical adsorption mechanism was attributed to the Schiff base reaction between the amino group on the chitosan ring and formaldehyde. In the C-history experiment, the C m0 of control panel was measured to be 1.94 × 10 5 mg/m 3 and D m to be 2.7 × 10 −8 m 2 /s, whereas after treatment with 3% MNCs, the C m0 ' was reduced to 0.29 × 10 5 mg/m 3 , the D m ' was reduced to 4.31 × 10 −10 m 2 /s and the partition coefficient K was enhanced from 243.9 to 855.5 in the original panels, indicating that the addition of MNCs significantly inhibited the diffusion of formaldehyde, enhanced the retention capacity of formaldehyde in the particleboards, and reduced the initial volatilizable formaldehyde reserves. This study provides theoretical basis and experimental support for the application of MNCs in the pollution control of wood-based panels, whose efficient emission reduction performance originates from the unique nanoporous structure and the active amino sites in chitosan molecules.
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高影响因子
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