MICROPOROUS AND MESOPOROUS MATERIALS
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2022
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IF 5.876
Huijie Xie,Wei Xu,Saiai Ran,Xiaolong Li,Bin Li,Yanyan Li,Lei Wang
Green synthesis of zeolite has been made much progress due to solvent-free grinding methods. Although solid-state synthesis is a simple green process with a high yield, its kinetics of the solid-phase crystallization process is still slow and the precursor materials are not uniformly heated throughout the reactor resulting into the poor uniformity of the particles. Herein, we report a high-efficiency organotemplate-free synthesis of ZSM-5 combining solid state grinding and steam-assisted crystallization. Solid state grinding (SSG) of aluminosilicate precursor avoids usage of solvent and steam-assisted conversion (SAC) in an organic-template-free condition grants a fast crystallization rate of ZSM-5. More importantly, the vapor fulfilled in the reactor ensures uniform heating of solid feedstock for crystallization of ZSM-5, leading the high crystallinity and the uniform particle size distribution . This combination can guarantee 100% relative crystallinity of ZSM-5 in 12 h, compared to that of 80% crystallinity from sole solid state at the same crystallization temperature (180 °C). Furthermore, this combination can achieve 83% relative crystallinity of ZSM-5 at 160 °C, compared to that of 37% crystallinity from the solid state alone. Highly dispersed ZSM-5 zeolite with adjustable SiO 2 /Al 2 O 3 ratio is prepared by steam-assisted crystallization of grinding solid raw materials. The catalytic activity of ZSM-5 catalyst from this combination strategy for the acetalization of cyclohexanone is superior to that of the solid-state method alone. This sustainable and green synthesis method provides a potential way for the preparation of zeolites in an industrial scale.
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SCIENCE OF THE TOTAL ENVIRONMENT
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2022
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IF 10.753
Shanqi Zhou,Mengru Fu,Kailun Luo,Zhihua Qiao,Cheng Peng,Wei Zhang,Juying Lei,Siyuan Ling,Bingsheng Zhou
Due to the characteristics of persistent organic pollutants (POPs), some legacy brominated flame retardants (LBFRs) were prohibited from use, and then gradually replaced by novel brominated flame retardants (NBFRs). However, till now little research focused on the effects of NBFRs on the benthos . In the present study, 0.5, 5, and 50 mg/kg dw of pentabromotoluene (PBT), hexabromobenzene (HBB), 1,2-bis(2,4,6-tribromophenoxy) ethane (BTBPE), decabromodiphenyl ethane (DBDPE) and decabromodiphenyl ether (BDE209) were added into sediments to test freshwater clams ( Corbicula fluminea ). In the 35-day exposure experiment, C. fluminea had different enrichment behaviors in three treatment groups. It was conjectured that in the lower dose group, the clams ingested contaminants and tended to be stable over time. While in higher dose groups, the clams were induced by the chemicals, leading to the changes in physiological activities so that the concentrations showed a downward trend first and then went up. The half-lives of contaminants in freshwater clams were between 0.911 and 11.6 days. DBDPE showed stronger bioaccumulation ability than BDE209 in this study. Parabolic relationships were observed between log BSAF and log K ow values in clam tissues. Debromination, hydroxylation, and methoxylated products were detected. Additionally, the gill samples of C. fluminea exposed to 50 mg/kg dw of single substance were observed by scanning electron microscope (SEM), indicating that the adhesions, tissue hyperplasia, and messy cilia occurred on the surface. Our research potentially contributes to further evaluations of the environmental risks posed in sediments contaminated by PBT, HBB, BTBPE, DBDPE, and BDE209, particularly the benthic organisms.
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JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
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2022
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IF 6.364
Yulong Yang,Wanyi Fu,Xixi Chen,Li Chen,Congyu Hou,Yanyi Wang,Tianhao Tang,Xihui Zhang
Silica sol is widely used in the preparation of mullite-based fiber porous ceramics (MFPCs), but it aggregates at the top surface of MFPCs during the drying process. This leads to the decrease in mechanical strength and porosity. To overcome the problem and fabricate homogeneous MFPCs, the sodium silicate solution and glass fibers were applied in the fabrication process of MFPCs. The effects of concentrations of sodium silicate solution and silica sol, amounts of glass fibers and sintering temperatures on the properties of prepared MFPCs were studied. The sodium silicate solution consolidated the silica sol and mullite fibers, forming a homogeneous structure and ensuring the even distribution of silica sol. Compared with other reported MFPCs, this process required low sintering temperature while maintaining high compressive strength (2.14 MPa) and porosity (75.93%). This study provides an effective method for preparing MFPCs with high strength, uniformity and porosity.
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JOURNAL OF PETROLEUM SCIENCE AND ENGINEERING
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2022
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IF 5.168
Peng Fang,Jia Wu,Botian Li,Bin Cheng,Daofu Song,Ningning Zhong
Asphaltenes are the heaviest compound group in crude oil. The complex and porous macromolecular network of asphaltenes both adsorbs and occludes small hydrocarbon molecules, which are considered source-related petroleum biomarkers as they are shielded from secondary alterations. The current method to isolate the occluded content involves mild oxidative degradation of asphaltenes with CH 3 COOH/H 2 O 2 , but it is generally not suitable for quantitative studies, as side reactions that chemically alter the bound hydrocarbons are difficult to mitigate. In the current study, we compared the performance of dispersive solid-phase extraction (DSPE) and mild oxidative degradation in isolating asphaltene-occluded hydrocarbons, using Lower Cambrian solid bitumen from northwestern Sichuan and Ordovician crude oil from the Tazhong area of Xinjiang, China. We demonstrated that DSPE was effective in extracting occluded hydrocarbons from asphaltene aggregates without undesirable chemical alterations, thereby allowing subsequent quantitative analysis. Further investigations revealed that the chemical composition of the occluded n -alkanes provided useful information with regard to the origin of the petroleum. Importantly, the enrichment of aromatic hydrocarbons inside the asphaltene aggregates, particularly the relative abundance of different methylphenanthrene isomers, provided crucial experimental evidence in support of our earlier hypothesis that the occluded hydrocarbons were protected from secondary alterations, and therefore had remained relatively stable over a long geologic period.
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NEW JOURNAL OF CHEMISTRY
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2022
·Vol. 46
·期 33
·15959-15966
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IF 3.925
Kai Zong,Ke Li,Ziyue Zhou,Lei Gong,Dongshun Deng
The uptake of NH3 in the industrial tail gas will improve the environmental quality for human health and ecology. Adsorption separation has the advantages of simple operation and low energy consumption. However, the relatively low adsorption capacity severely hinders its practical utilization. In this work, four glycerol-based deep eutectic solvents (DESs) were incorporated into porous silica gels (SGs) and Al2O3 with a large surface area and pore structure to form novel DES/SG and DES/Al2O3 composites. The obtained materials were systematically characterized by FTIR, SEM, BET, and TGA and further evaluated for NH3 adsorption. The results showed that the acidic GuSCN:Gly DES played an indispensable role for the high adsorption ability of the composite. 40 wt% GuSCN : Gly (1 : 3) DES/SG can capture 115.40 mg NH3 per gram adsorbent, which is better than most of the solid adsorption materials reported in the literature and even 30% higher than the original SG. The high adsorption capacity, outstanding thermal stability, and good reusability confirm the success of the present strategy. This study will provide a useful idea for designing DES-supported composites for NH3 separation applications.
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MICROPOROUS AND MESOPOROUS MATERIALS
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2022
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IF 5.876
Shiqing Li,Xiaomeng Si,Rusi Peng,Huang Pan,Hao Xu,Jingang Jiang,Yanhang Ma,Peng Wu
Hierarchical Beta zeolite (named ECNU-41) was directly synthesized with commercially available ionic liquid 1-butyl-1-methylpyrrolidinium hydroxide as organic structure-directing agent (OSDA) in the absence of any surfactants or polymers. The ECNU-41 crystals were composed of nanorods through a unique stacking manner, exhibiting a morphology resembling the Chinese traditional toy “burr puzzle”. The orderly crisscrossed stacking ECNU-41 possesses high hydrothermal stability, abundant intercrystal mesoporosity, and enriched phase of polymorph B. In comparison to conventional nanosized Beta zeolites, ECNU-41 aluminosilicate and titanosilicate exhibited more remarkable and competitive catalytic performances in a variety of reactions, including benzene alkylation , methanol to propylene , and alkenes epoxidation. With improved diffusion rate and mass transfer due to the hierarchical structure, ECNU-41 is expected to serve as promising catalysts for those reactions involving bulky molecules.
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NATURAL PRODUCT RESEARCH
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2022
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IF 2.488
Junping Chen,Yichen Li,Jianguo Cao,Jinwen Huang,Can Jiang,Xiling Dai,Guozheng Huang
Phytochemical investigation of Adiantum flabellulatum L. led to the isolation of four natural compounds, including a novel unsaturated fatty acid with a cyclopropane moiety, i.e. (S,E)-7-(2-octylcyclopropylidene)heptanoic acid (1), together with three known compounds, isoadiantol B (2), stigmast-4-en-6β-ol-3-one (3), β-sitosterol (4). Compound 3 was isolated from the A. flabellulatum L. for the first time. The structure of 1 was elucidated following a comprehensive analysis of spectroscopic analyses including MS, 1 D and 2 D NMR, and by a mass spectrometry experiment of the dimethyl disulfide (DMDS) adduct, while the known compounds were identified by comparisons with those reported in the literature. Enzyme evaluation of 1 indicated this compound possesses anti- protein tyrosine phosphatase (PTP1B) activity with an IC50 value of 6.99 ± 0.41 μM in vitro.
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Frontiers in Chemistry
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2022
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IF 5.545
Zhang Changsheng,Chu Shaoqi,Jiang Jie,Zhao Jinchong,Wen Song,Sun Bing,Xu Wei
Synthesis of zeolites in more efficient and greener methods is of great significance in both industrial and academic fields. However, the relative long time for zeolite crystallization and much consumption of water solvent make the target challengeable. Herein, a route for ultrafast synthesis of nano Silicalite-1 zeolites in 10 min with much less water consumption has been developed. Comprehensive characterizations, i.e., X-ray powder diffraction, N2 sorption, scanning electron microscope, and NMR, confirm the high quality of such obtained Silicalite-1 zeolites. In the catalytic deoxygenation of O2-containing ethylene (mixture of O2 and ethylene), these reported Silicalite-1 zeolite samples show the comparable performance with the conventional Silicalite-1 zeolites synthesized under hydrothermal conditions. This research therefore provides a new trial toward the ultrafast synthesis of zeolite materials in an environment-friendly route.
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Greenhouse Gases-Science and Technology
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2022
·Vol. 12
·期 2
·305-320
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IF 2.518
Zichen Liu,Shuman Xu,Jing Hao,Lina Song,Mingben Chong,Dang-Guo Cheng,Fengqiu Chen
The conversion of CO 2 into high-value chemicals has drawn a great deal of consideration, of which the most ideal product is lower olefins. However, the modified Fischer–Tropsch (F-T) synthesis with CO as an intermediate shows poor selectivity for lower olefins. Here, a list of bifunctional catalysts consisting of SAPO-34 zeolites with adjustable silicon contents and In 2 O 3 /ZrO 2 were synthesized. In the reaction process, CO 2 is first hydrogenated to methanol over an In 2 O 3 /ZrO 2 catalyst, and then the generated methanol rapidly diffuses to the adjacent zeolite catalyst to react to lower olefins. The selectivity of lower olefins (88.3%) and conversion rate of CO 2 (23.3%) was achieved over In 2 O 3 /ZrO 2 and SAPO-34-0.05 at 633 K, a gas hourly space velocity (GHSV) of 4500 ml·gcat –1 ·h –1 , and H 2 /CO 2 /Ar = 3:1:1. The catalytic performance remained stable after 50 h of reaction. Characterization analysis showed that Si content affected the content of Brønsted acid sites (BAS) and morphology of SAPO-34, resulting in different distribution of reaction intermediates. Tetramethyl-benzenes, as important intermediate species, had a slower conversion rate on the SAPO-34 with low Si content and nanosheet morphology, which led to high lower olefins selectivity. © 2022 Society of Chemical Industry and John Wiley & Sons, Ltd.
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SEPARATION AND PURIFICATION TECHNOLOGY
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2022
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IF 9.136
Wentao Li,Jianwei Guo,Haojie Du,Dong Wang,Jianwei Cao,Zhi Wang
Remove of trace Al 3+ from rare earth solutions is a challenging task. In the present study, an aluminum ion imprinted polymer (Al (III)-IIP) has been fabricated by surface-imprinting method. Al (III)-IIP was obtained by grafting silica gel with aminopropyl triethoxysilane and acrylic acid (AA). The structure and morphology of the polymer were characterized by Fourier transform infrared spectroscopy (FT-IR), scanning electron microscopy (SEM), and thermogravimetric analysis (TG). The densification degree and the number of grafted functional groups were regulated by changing the synthesis conditions, and the optimal synthesis conditions are obtained as template ion: functional monomer: crosslinker = 1:8:8, and the optimal synthesis temperature is 333.15 K. The adsorption performance and selectivity properties of Al (III)-IIP were also investigated. The results show that at 298.15 K, the optimal pH for Al 3+ adsorption is 4. The maximum adsorption capacity is 106.0 mg·g −1 at an Al 3+ ion concentration of 1000 mg·L −1 , which is 50% higher than that of reported recently. In addition, the adsorption process reaches equilibrium within 180 min. Furthermore, among many adsorption models and isothermal models, pseudo-second-order (PSO) adsorption model and Langmuir isothermal model are more suitable for the adsorption process. The selectivity coefficient of the Al 3+ ion in binary mixtures of Nd 3+ , Ca 2+ or Mg 2+ are 17.76, 16.72 and 11.09, respectively. In addition, the adsorption mechanism of Al 3+ is most probably caused by the formation of ionic bond between the Al 3+ ions and the carboxyl functional groups on Al (III)-IIP and template effect. Results show that Al (III)-IIP has a great potential for a selective separation of aluminum ions from rare earth solutions.
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JOURNAL OF RADIOANALYTICAL AND NUCLEAR CHEMISTRY
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2022
·Vol. 331
·期 2
·673-681
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IF 1.754
Xie Kangjun,Hua Rong,Dong Zhen,Wang Nan,Zhang Manman,Qi Wei,Zhai Maolin,Yang Jun,Zhao Long
Selective adsorption of TcO 4 − from radioactive waste is important for the nuclear industry. In this work, three 1-vinyl-3 benzylimidazole chloride modified mesoporous silica bearing different pore volumes and specific surface areas were synthesized using radiation grafting. The effect of pore structure on the adsorption properties of the three adsorbents were studied. The adsorbents with bigger specific surface area and pore volume were conducive to ReO 4 − adsorption in terms of both adsorption rate and capacity. The prepared adsorbents displayed good radiation resistance under gamma rays in dry or wet conditions, and they could selectively remove ReO 4 − from simulated Hanford wastewater in column experiments.
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DYES AND PIGMENTS
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2022
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IF 5.122
Le Wang,Xiaohong Pan,Shuzhi Tang,Yaqi Wang,Haixing Shi,Huanhuan Wang,Wenzhen Liu,Zhuo Chen
The skin microbiota is an inseparable component of the skin barrier structure, which participates in the stabilization or impairment of the barrier function as well as the development of many skin diseases. In order to maintain the stability of skin bacteria community structure, people pay more and more attention to protecting probiotics, such as bacilli, and killing pathogens, such as Gram-positive cocci. We herein report a negatively charged photosensitizer TPA-3NBA with aggregation-induced emission (AIE) characteristics, which was synthesized by one-step reaction, can selectively and rapidly stain (within 0.5 min) and effectively kill Gram-positive cocci (killing 6.0 log 10 of Staphylococcus aureus at a concentration of 1 μM) without affecting bacilli under white light irradiation. This selective bacterial imaging makes it possible to quickly identify locally bacterial infection. Furthermore, the normal concentration of divalent ion (Ca 2+ ) in human body can significantly promote the absorption of TPA-3NBA by Gram-positive cocci, thus improving its antibacterial activity. To the best of our knowledge, this is the first photosensitizer to be reported with good performance in selective bacterial imaging and removal of Gram-positive pathogenic cocci, indicating its potential application prospect in targeted antimicrobial therapy.
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