Materials Today Chemistry
·
2023
·
IF 7.3
Hari Bandi,Ashok Kumar Kakarla,Kedhareswara Sairam Pasupuleti,R. Shanthappa,P.P. Waifalkar,Moon-Deock Kim,Jae Su Yu
Vanadium-based metal oxides are used in different fields like gas sensors, supercapacitors , and lithium (Li)-ion batteries due to their availability, layered structure, and facile synthesis. Herein, we report a temperature-effective strategy to synthesize hexagonal-shaped zinc vanadate (Zn 2 VO 4 (ZVO)) nanostructures (NSs) via a facile hydrothermal method without any further doping of an element or carbon additive. The synthesized ZVO NSs provide large surface area, low energy band gap, and fast Li + diffusion. When compared with the ZVO-120 (synthesized at 120 °C) and ZVO-160 samples, the ZVO-140 sample shows a lower energy band gap value of 2.57 eV with higher surface area (37 m 2 g −1 ) and porous nature. As an anode material for Li-ion batteries, the ZVO-140 demonstrates superior rate capability (126 mA h g −1 at 1.5 A g −1 ) and excellent cycling performance (576 mA h g −1 after 100 cycles at 0.05 A g −1 and 327 mA h g −1 after 2000 cycles at 1 A g −1 ) as well as good Li + diffusion coefficient (2.61 × 10 −8 cm 2 s −1 ). Due to these synergistic benefits, ZVO NSs are used for NH 3 gas sensing application. The ZVO-140 sample exhibits excellent sensitivity (47.3%) at 190 °C with fast response/recovery time (136 s/128 s) and reliable stability towards NH 3 gas (100 ppm) at 190 °C, when compared with counterparts (ZVO-120 and ZVO-160). This preparation strategy may initiate the design of advanced ZVO-based materials for multifunctional applications.
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SEPARATION AND PURIFICATION TECHNOLOGY
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2023
·
IF 8.6
Xixi Cen,Yuxiu Sun,Caijiao Yu,Chenxu Geng,Zhenjie Gu,De Ao,Zhengqing Zhang,Zhihua Qiao,Chongli Zhong
Large-area metal–organic framework (MOF) single crystal membrane materials hold great appeal in gas separation field due to their outstanding separation selectivity and permeability. Nevertheless, it is currently difficult to prepare MOF single crystals large enough for gas separation tests owing to the limited manufacturing processes. In this work, we fabricate a self-supporting MOF single crystal (Co-btec SC) membrane with 0.3 × 0.1 cm 2 dimension via a facile supersaturation synthesis strategy. Benefiting from the one-dimensional (1D) transmission pathway and three-dimensional (3D) connection network, the obtained Co-btec SC has ultra-high permeability of 47,647 Barrer. Besides, the H 2 O molecules firmly filled in the pore channels greatly improve the affinity and solubility for CO 2 , and thus Co-btec SC yields CO 2 preferential permeation in CO 2 /H 2 mixture with superior CO 2 /H 2 selectivity of 18.79. In addition, the Co-btec SC shows dramatic high-temperature and high-humidity separation stabilities. To demonstrate the versatility of this strategy, we also successfully fabricated hydrogen-bonded organic framework single crystals (HOF SCs) with the size of about 0.4 cm. This supersaturation strategy opens a new way to fabricate the large-area MOF single crystal membranes.
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JOURNAL OF APPLIED POLYMER SCIENCE
·
2023
·Vol. 140
·期 38
·e54441
·
IF 3
Yunxiao Dong,Yong Yang,Jinggang Wang,Qianfeng Wang,Xiaoqin Zhang,Han Hu,Jin Zhu
In this work, we prepared a series of bio-based poly(butylene adipate- co -furandicarboxylate) (PBAF) copolyesters with BF segments ranging from 20 to 80 mol% through a two-step polycondensation. Then, their thermal, mechanical, gas barrier, and degradable properties were investigated. With the increase of BF content, the glass transition temperatures ( T g ) and melting temperatures ( T m ) of PBAFs increase constantly. Besides, PBAF copolyesters exhibit excellent mechanical performance with elongation at break in the range of 140% to 870%. The elastic modulus and tensile strength of PBAF60 are 138 and 17 MPa respectively, which are comparable to those of commercial poly(butylene adipate- co -terephthalate) (PBAT). Moreover, thanks to the structural characteristics of the furan ring, the barrier performances against CO 2 , O 2 , and H 2 O of PBAFs are 4.6–147.5 folds, 4.0–76.0 folds, and 0.8–8.7 folds of PBAT, respectively. Finally, the degradation tests reveal that the weight losses of PBAFs increase with decreasing BF contents. It is worth emphasizing that although the compost degradation rate of PBAF60 is slightly lower than that of PBAT, it is still a prospective alternative to PBAT due to its improved barrier properties. And it provides a possibility for applications in food packaging, mulch films, and structural elements.
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CHEMICAL ENGINEERING JOURNAL
·
2023
·
IF 15.1
Guoxiong Zhan,Bingling Yuan,Yuanmeng Duan,Yongfeng Bai,Jianjun Chen,Zhen Chen,Junhua Li
Amine-based chemisorption technology with water-lean solvent is a promising route towards low-cost CO 2 capture. Optimized water-lean amine-based solvent, composed of blend amines and physical solvent, is adopted to verify the performance of split-flow heat exchange strategy for CO 2 -rich solvent regeneration. A rigorously validated process simulation method is proposed for operational optimization and comprehensive economic, exergy, environment, energy (4E) analysis of the capture process on an industrial scale. The experimental and simulation results indicated that the optimal ratio of split-flow was 0.55–0.70, with this ratio resulting in the reflux temperature increasing from 90 to 112 °C. The proportion of total energy duty that went to reaction heat was increased to 71% from 52% in the benchmark case; this increase was ascribed to the synergistic promotion of physical solvent and split-flow heat exchange configuration. The water-lean solvent could operate at a regeneration duty of 2.07 GJ/t CO 2 with a total capture cost of US $50.40/t CO 2 (27% lower than the benchmark value) from coal-fired flue gas. In summary, the net CO 2 reduction can be increased by 28%, taking the utility heat-cold consumption into account. This research indicates a feasible method of taking full advantage of water-lean solvent to achieve efficient CO 2 capture.
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JOURNAL OF MATERIALS SCIENCE
·
2023
·Vol. 58
·期 27
·11016-11028
·
IF 4.5
Xiao Xue,Jin Wei,Tang Cao,Qi Xin,Li Rui,Zhang Yi,Zhang Wusheng,Yu Xue,Zhu Xiaodong,Ma Yanqing,Ma Lei
Reduced graphene oxide (rGO) has attracted an enormous interest as a promising candidate for gas detection due to its large specific surface area, abundant oxygen-containing functional groups and scalable production. Although intense works have been conducted on rGO-based gas sensors, there is still much room for improvement on both their response speed and thorough exploration. In this work, thermal reduced graphene oxide (TRGO) is fabricated by spinning dilute graphene oxide (GO) suspension combined with subsequent in situ thermal reduction. TRGO sheets with size of more than 10 μm are uniformly dispersed and smoothly coated on Au interdigitated electrodes. The ammonia sensing performance indicates that 250 °C-TRGO exhibits the shortest response time of 11 s to 100-ppm ammonia. Besides, 130 °C-TRGO shows strong response to low concentration ammonia with the calculated limit of detection (LOD) of 0.9 ppm. After being exposed to air for 3 months, it still maintains 74.23% of its initial responsivity demonstrating the excellent long-term stability. Moreover, the systematic investigation on the effect of annealing temperature to the sensing performance of TRGO elaborates that with the increase in thermal reduction temperature, the responsivity monotonically decreases while the response time will decrease initially and then gradually increase after the turning point of 250 °C. These results shed a light on developing TRGO-based ammonia sensors (TBASs) for future practical applications.
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MICROPOROUS AND MESOPOROUS MATERIALS
·
2023
·
IF 5.2
Yu-Jie Lai,Jun-Yang Ji,Hui-Fang Wang,Zheng Niu,Jian-Ping Lang
Adsorption sites play an essential role in gas separation. We introduce N-oxide groups into MOFs to investigate the binding interactions between N-oxide groups and light saturated hydrocarbons for the first time. MOF-808-INO with N-oxide groups shows great performance to separate the mixture of methane, ethane and propane. Remarkably, MOF-808-INO exhibits a very low heat of adsorption of propane, which is important for pre-activation. The cycling experiments reveal that subsequent activation is only required at room temperature with nitrogen purging for several hours, indicating that MOF-808-INO has immense potential applications for recycled materials.
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Acta Biomaterialia
·
2023
·
IF 9.7
Chenyi Huang,Jia Tang,Yuanqi Liu,Ting Chen,Junyang Qi,Shengjie Sun,Huisong Hao,Weiwei Zeng,Jing Zhao,Meiying Wu
Nitric oxide (NO) is a crucial gaseous medium for tumor growth and progression, but it may also cause mitochondrial disorder and DNA damage by drastically increasing its concentration in tumor. Due to its challenging administration and unpredictable release, NO based gas therapy is difficult to eliminate malignant tumor at low safe doses. To address these issues, herein, we develop a multifunctional nanocatalyst called Cu-doped polypyrrole (CuP) as an intelligent nanoplatform ( [email protected] ) to deliver the NO precursor BNN6 and specifically release NO in tumors. Under the aberrant metabolic environment of tumors, [email protected] catalyzes the conversion of antioxidant GSH into GSSG and excess H 2 O 2 into ·OH through Cu + /Cu 2+ cycle, which results in oxidative damage to tumor cells and the concomitant release of cargo BNN6. More importantly, after laser exposure, nanocatalyst CuP can absorb and convert photons into hyperthermia, which in turn, accelerates the aforesaid catalytic efficiency and pyrolyzes BNN6 into NO. Under the synergistic effect of hyperthermia, oxidative damage, and NO burst, almost complete tumor elimination is achieved in vivo with negligible toxicity to body. Such an ingenious combination of NO prodrug and nanocatalytic medicine provides a new insight into the development of NO based therapeutic strategies. Statement of significance A hyperthermia-responsive NO delivery nanoplatform ( [email protected] ) based on Cu-doped polypyrrole was designed and fabricated, in which CuP catalyzed the conversion of H 2 O 2 and GSH into ·OH and GSSG to induce intratumoral oxidative damage. After laser irradiation, hyperthermia ablation and responsive release of NO further coupled with oxidative damage to eliminate malignant tumors. This versatile nanoplatform provides new insights into the combined application of catalytic medicine and gas therapy.
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PubMed
高影响因子
JOURNAL OF FOOD COMPOSITION AND ANALYSIS
·
2023
·
IF 4.3
Peng Sun,Zhao Yu,Chao Wang,Shuo Li
The cholesterol, cholestanol, brassicasterol , ergosterol , campesterol , stigmasterol , β-sitosterol, and stigmastanol content of rapeseed was determined herein. The sterols were isolated after derivatization and determination using pressurized liquid extraction coupled with gas chromatography–mass spectrometry. The results revealed a good linear relationship between the peak area and the corresponding mass concentration of the eight sterols in the range of 2–1000 mg/L, with correlation coefficients greater than 0.9991, detection limits of 1.12–1.52 mg/kg, quantification limits of 3.73–4.98 mg/kg, and satisfactory mean relative recoveries determined at 5–20 mg/kg and 200–1000 mg/kg. The mean relative recoveries were 92.5–104 % at the mg/kg supplemental level, and the precision was under 4.8 %. The developed method was efficient, simple, and accurate, suitable for the qualitative and quantitative analysis of sterols in rapeseed and providing a method for their rapid determination.
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CHEMICAL ENGINEERING JOURNAL
·
2023
·
IF 15.1
Ying Sun,Ju Bai,Peijun Zheng,Qi Wu,Zhili Cai,Tianliang Han,Linglong Shan,Shuangjiang Luo,Suojiang Zhang
Highly permeable and selective synthetic polymer membranes are attractive for energy-efficient gas separations, while fabricating such membranes with well-defined micropore architecture and interconnectivity remains a significant challenge. We report the design and fabrication of highly crosslinked and microporous polymer nanofilms via engineering the bridged-bicyclic triptycene triamine moieties into the interfacially polymerized networks. The integrated polyamide nanofilms exhibited hierarchical pore structures with finely tuned microporosity (pore size 0.7–1.0 nm), ultramicroporosity (pore size 0.4–0.7 nm), and submicroporosity (pore size < 0.4 nm) and enhanced micropore interconnectivity due to triptycene-induced non-coplanar orientation and configurational free volume in the networks. Consequently, the composite membranes comprising polyamide nanofilms display exceptional gas separation performance for He and H 2 recovery with enhanced permeances and selectivities as well as notable plasticization resistance compared to current state-of-the-art highly crosslinked TFC membranes. It is also proved that the microporosity and gas transport properties of the composite nanofilms are highly tailorable by regulating the reaction conditions. Incorporating hierarchical triptycene units with well-defined and interconnected microvoids provides the potential to fabricate highly permselective thin-film composite membranes applicable for various important gas separations.
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JOURNAL OF MEMBRANE SCIENCE
·
2023
·
IF 9.5
Shuyue Pang,Yanhong Li,Xiaofang Chen,Aisheng Huang
The fabrication of mixed matrix membranes (MMMs) by intermixing suitable fillers with organic polymers is an effective strategy to surmount the well-known trade-off effect between gas permeability and selectivity, which can promote separation performance of membranes to a great extent. Two-dimensional (2D) metal-organic frameworks (MOFs) are considered as potential fillers for strengthening the separation performance of MMMs as they possess high aspect ratio and distinctive chemical characteristics. However, it remains challenging in engineering the morphology of the MOFs with desired pore structure and high aspect ratio. In this study, we firstly prepare c-axis oriented ZIF-95 sheets with lateral dimension exceeding 22 μm and thickness of around 3 μm by the solvothermal method. And then the ZIF-95 sheets are incorporated into the polyimide (PI) matrix to fabricate highly c -axis oriented ZIF-95@PI MMMs (denoted as COZIF-95@PI MMMs thereafter). Attributing to the straight permeation channel of ZIF-95 (3.6 Å) for gas permeation as well as its high compatibility with polyimide substrates, the COZIF-95@PI MMMs show a high gas separation capability. At 373 K and 100 kPa for the COZIF-95@PI MMM with 40 wt% loading, the mixture separation factors of H 2 /CH 4 and H 2 /CO 2 are 134 and 58, respectively, and the H 2 permeability exceeds 967 barrer , which is hopeful for the separation and purification of hydrogen.
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Molecular Catalysis
·
2023
·
IF 4.6
Muyao Li,Zhaolian Zhu,Shiyu Yuan,Liya Ji,Tianhe Zhao,Yan Gao,Hailing Wang
In order to improve the efficiency and reusability of gas diffusion electrodes for hydrogen peroxide (H 2 O 2 ) electrosynthesis, we modified the graphite felt with nitric acid and constructed nitrogen-oxygen co-doped graphite felt/polytetrafluoroethylene/gas diffusion electrodes. The graphite felts before and after nitric acid modification were characterized by SEM, contact angle measurements, FTIR, and XPS, which showed that nitric acid modification resulted in a significant increase of oxygen- and nitrogen-containing functional groups (such as carboxyl groups and pyridinic nitrogen), which could improve the H 2 O 2 yield and current efficiency. The H 2 O 2 yield of the electrode prepared under the optimized modification conditions can reach 42.2 mg·L −1 ·cm −2 , and the current efficiency can be maintained at about 80.0%. The electrode shows relatively stable performance of H 2 O 2 electrogeneration during 13 cycles, and has a promising application prospect.
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高影响因子
Processes
·
2023
·Vol. 11
·期 4
·1075
·
IF 3.5
Zhaochen Huang,Guoqiang Huang
Usually, the ion implantation gases used in semiconductor production are required to be extremely high in purity. Due to the presence of trace CO2in electronic special gas BF3, the quality of the material is significantly affected, which makes it crucial to impose control on CO2content. Unlike a series of blank adsorbents reported in other studies, the zinc-loaded adsorbents prepared in this study are intended for the adsorption of CO2from CO2/BF3. Firstly, the materials were characterized by XRD, BET, SEM-EDS and TG-DSC analysis, etc., and the breakthrough curves of the adsorbents as obtained under different preparation conditions were investigated at 20 °C and 200 kPa. The results show that the adsorption performance reached the optimal level when the activation temperature was 450 °C and a 13X molecular sieve was impregnated by 0.15 mol/L Zn(NO3)2. Moreover, compared with the Zn-13X, the breakthrough time was reduced to 69% and 44% in two adsorption cycles, respectively. Finally, FTIR was used to reveal the adsorption mechanism of the carbonates produced by CO2adsorption. It was found that the adsorption performance was affected by the irreversible reduction in the number of active sites due to the continuous formation of polydentate carbonate during adsorption and regeneration.Keywords:CO2adsorption;13X molecular sieve;carbonate species
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