SEPARATION AND PURIFICATION TECHNOLOGY
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2014
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IF 3.065
Lidan Lv,Jie Zhang,Chongpin Huang,Zhigang Lei,Biaohua Chen
The removal of dimethyl disulfide from model liquefied petroleum gas using metal salt impregnated zeolite as the adsorbent was studied in a fixed-bed adsorption equipment. Effects of different carrier, metal iron species and content of active component, mass space velocity, temperature, as well as adsorption selectivity and regeneration performance were all investigated by performing the breakthrough experiment. Among all these adsorbents, 5 wt.%Ag 2 O/NaY showed the highest breakthrough sulfur capacity. The adsorption selectivity of Ag 2 O/NaY was studied by the infrared spectra. It was found that the direct S–Ag(I) interaction was the essential reason for the evidently improved adsorption ability and selectivity of Ag 2 O/NaY for removing disulfide from solutions containing olefin . Regeneration study indicated that the saturated adsorbent was regenerated under the temperature of 550 °C for 8 h in the air atmosphere. After five times regeneration, the adsorbent Ag 2 O/NaY still shows high breakthrough sulfur capacity.
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JOURNAL OF RARE EARTHS
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2022
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IF 4.632
Yandi Cai,Peng Yang,Qinglong Liu,Kaili Ma,Wenxin Ma,Wang Song,Qiuhui Qian,Fei Gao,Wei Tan,Lin Dong
Sulfation treatment has been widely used to promote the catalytic performance of ceria (CeO 2 ) based catalysts for the selective catalytic reduction of NO by NH 3 (NH 3 -SCR of NO). Praseodymium oxide (PrO x ), another commonly used rare earth material with similar structural properties as CeO 2 , also shows satisfactory redox properties due to the facile redox cycle of Pr 3+ ↔ Pr 4+ . In this work, gas phase sulfation treatment with varied duration was performed on PrO x at 200 °C, and the NH 3 -SCR activity of sulfated PrO x was evaluated. Based on the results of systematic characterizations (e.g., N 2 -physisorption, NH 3 oxidation , NO oxidation, in situ diffuse Fourier transform infrared spectroscopy), it is revealed that the catalytic performance of sulfated PrO x is highly dependent on the sulfation time (or the amount of sulfate species deposited on PrO x ), which has a significant impact on the competitive reaction between NH 3 oxidation and NH 3 -SCR of NO, thus determining the NH 3 -SCR activity of PrO x . This work provides new insight into tuning the interaction between PrO x surface and reactants (NO, NH 3 ) via sulfation treatment, which cam guide the design and application of PrO x based catalysts for NH 3 -SCR of NO in the future.
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Heliyon
·
2023
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IF 4
Liangliang Tian,Xin Qu,Dongmei Huang,Yongfu Shi,Cong Kong,Yuan Wang
This research aimed to develop an effective method for detecting semivolatile earthy-musty odors without using the conventional sample processing equipment used for volatile compounds. The concurrent isolation of 2-methylisoborneol (2-MIB), trans -1,10-dimethyl-trans-9-decalol (geosmin, GSM), 2-isopropyl-3-methoxy pyrazine (IPMP), and 2-isobutyl-3-methoxy pyrazine (IBMP) in tap water was successfully achieved by employing a combination of n-hexane liquid‒liquid extraction (LLE) and silica solid-phase extraction (SPE) techniques. Gas chromatography–mass spectrometry (GC-MS) was utilized for the identification of these targets, with the inclusion of borneol (BN) as an internal reference. This robust method was optimized and validated. It was found that the method showed good linearity in the range of 0.5–100 ng/mL and produced good recoveries (84.6 %–103 %) with satisfactory relative standard deviations (1.50 %–10.1 %). The determined limits of detection (LODs) for the group of four substances were found to vary from 0.3 to 0.9 ng/L, whereas the limits of quantitation (LOQs) exhibited variations between 1 and 3 ng/L. The subsequent implementation of this methodology to evaluate the four previously described off-flavor chemicals in tap water resulted in satisfactory results.
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PubMed
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EUROPEAN POLYMER JOURNAL
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2022
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IF 5.546
Qianfeng Wang,Jinggang Wang,Yunxiao Dong,Xiaoqin Zhang,Han Hu,Lionel OYoung,Di Hu,Jin Zhu
Copolyesters based on 2,5-furandicarboxylic acid (FDCA) have attracted particular attention due to their outstanding gas barrier properties and biodegradability compared with commodity degradable polymers. This study provides the first comprehensive assessment of the effect of the segmental lengths of aliphatic diols on the properties of FDCA-based copolyesters. A series of poly(alkylene adipate- co -furanoate) (PAAF) copolyesters comprised of different aliphatic diols were prepared via melt polycondensation reaction and their comprehensive properties, including thermal properties, mechanical properties, gas barrier properties, degradability, and antibacterial activities were thoroughly investigated. NMR and GPC results confirm the successful synthesis of high-molecular-weight random copolyesters (their M w varies from 67,500 to 126,500 g·mol −1 ). The glass transition temperatures ( T g ) of PAAFs decreases with increasing diol segmental lengths whereas a zig-zag variation in the melting temperatures ( T m ) is observed due to the odd–even effect. All PAAFs exhibit good ductility and excellent mechanical properties with tensile moduli between 27 and 102 MPa. The gas barrier performances of PAAFs are 2.1 to 13.4 folds for O 2 and 2.4 to 13.6 folds for CO 2 better than those of poly(butylene adipate- co -terephthalate) (PBAT), respectively. All PAAFs can be rapidly biodegraded within 25 days under enzymatic hydrolysis conditions.
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PHYSICAL CHEMISTRY CHEMICAL PHYSICS
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2013
·Vol. 15
·期 21
·8228-8236
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IF 3.829
Shaofeng Zhang,Feng Ren,Wei Wu,Juan Zhou,Xiangheng Xiao,Lingling Sun,Ying Liu,Changzhong Jiang
Composite materials containing different components with well-defined structures may cooperatively enhance their performance and extend their applications. In this work, core–shell γ-Fe2O3@SnO2 hollow nanoparticles (NPs) were synthesized by a low-cost and environmentally friendly seed-mediated hydrothermal method. Firstly, the γ-Fe2O3 hollow NPs were synthesized by a template-free method. Then they were used as the cores for the growth of SnO2 shells. The thickness of the shell can be simply tailored by controlling the reaction time. Various techniques, including SEM, XRD, TEM and HRTEM, were employed to investigate the morphology, structure and formation process of the special core–shell hollow structures. The combination of magnetic semiconductor (γ-Fe2O3) and wide band-gap semiconductor (SnO2) endowed them with great potential to be used as recyclable photocatalysts. Experiments on photo-degradation of Rhodamin B (RhB) dye in the presence of the samples showed that the hybrid structures possessed higher photocatalytic activities than the monomer structures of SnO2 and γ-Fe2O3 materials indicating a strong coupling enhancement effect between the wide and narrow band-gap semiconductors. Moreover, the gas sensing tests of the γ-Fe2O3@SnO2 hollow NPs revealed that the samples exhibited fast response and recovery rates, which enable them to be promising materials for gas sensors.
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ANALYTICAL AND BIOANALYTICAL CHEMISTRY
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2025
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IF 3.8
Sun Tao,Shen Xin,Yang Xinyu,Qi Haolong,Yang Kexin,Xing Yilin,You Mengyi,Duan Mengyao,Cai Zhiqiang,Nardiello Donatella,Quinto Maurizio,Liu Xianming,Zhang Shusheng
Cyclotriveratrylene (CTV) possesses a rigid and bowl-shaped architecture with a π -electron-rich cavity. In this work, CTV modified with C10 alkyl chains (CTV-C10) has been synthesized and used for the first time as a stationary phase for gas chromatography (GC) analysis. The statically coated CTV-C10 column showed moderate polarity and high column efficiency (3446 plates m −1 , determined by n -dodecane at 120 °C). Due to its nanoscale channels, the CTV-C10 column displayed a strong affinity for aromatic compounds. Compared with CTV and commercial HP-5 and HP-35 columns, the CTV-C10 column exhibited better performance for the critical resolution of dibromobenzene, dichlorobenzene, and chloronitrobenzene isomers. Moreover, CTV-C10 columns showed 0.02%, 0.09%, and 4.96% repeatability RSD values for intra-day, inter-day, and between-columns, respectively. This study demonstrated the feasibility of CTV-C10 columns, providing a new perspective for developing selective nanoscale separation channels through CTV stationary phases in chromatographic analysis. Graphical abstract
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JOURNAL OF MEMBRANE SCIENCE
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2025
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IF 9
Linjun Wu,Yanying Xiu,Zhiqiang Shen,Yuexi Zhou,Jiane Zuo
This research introduces an innovative series-connected two-stage submerged gas permeable membrane (STSGPM) system for anaerobic digestate treatment, integrating ammonia recovery, digestate concentration, and water reclamation. The system achieved over 99 % ammonia removal across various temperature gradients, with the 65/55/25 °C gradient showing optimal water flux, where the average water flux of the first-stage SGPM (SGPM1) was recorded at 3.43 L/m 2 /h, while the second-stage SGPM (SGPM2) maintained a consistent flux of 4.25 L/m 2 /h. STSGPM achieved interception rates of 99.8 % and 99.41 % for inorganic ions and organic matter, respectively. After 10 cycles, SGPM2 remained stable, but SGPM1 experienced fouling from gel-like organic deposits (proteins, microbial products, fulvic acid), which were fully removed post-cleaning. The high-purity (NH 4 ) 2 SO 4 , the concentrated digestate meeting agricultural standards, and the reclaimed water compliant with urban miscellaneous water use standards highlight the effective reutilization of the three by-products. This aligns with the zero-discharge objective, underscoring the potential of STSGPM to advance resource recovery from anaerobic digestate. Additionally, the recovery of (NH 4 ) 2 SO 4 and high-quality water generates potential profits, reducing the net operating cost of the STSGPM system to $0.155 per kilogram of NH 3 recovery. Overall, the STSGPM process represents a cost-effective and efficient ammonia recovery strategy with significant potential for widespread application.
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LWT-FOOD SCIENCE AND TECHNOLOGY
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2025
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IF 6.6
Shasha Yu,Xuchao Lan,Yimiao Tang,Yiruo He,Xiaxi Pan,Liming Ge,Changdao Mu,Zhilang Xu,Defu Li
Modified Atmosphere Packaging (MAP) technology holds significant potential for preserving fruits and vegetables. In this study, we explored a novel MAP gas regulation technology that regulates selective gas permeation and achieves gas equilibrium within the package. Inspired by natural leaf stomata that regulate plant respiration, we fabricated polyethyleneimine-modified porous chitosan microspheres (PEI-PCM) that mimic the function of stomatal ‘switches’ in order to enhance respiratory regulation. And PEI-PCM were introduced into the gelatin-tannic acid (GT) film to construct a biomimetic porous chitosan microsphere-composite gelatin-based film (GT@PEI-PCM, GTPP) for the preservation of perishable fruits (litchi and waxberry). GTPP film can control and regulate gas exchange driven by CO 2 concentration levels, achieving atmospheric equilibrium within 24 h and preventing oxidative damage to fruits. In addition, GTPP films demonstrated excellent tensile strength as well as water resistance, antibacterial, and antioxidant properties. The incorporation of modified microspheres could regulate the gas permeability and selectivity (CO 2 /O 2 : 0.79–2.53) of the gelatin-based films, which successfully prolonged the freshness of litchis and waxberries. Overall, this innovative gas permeation control strategy provides a novel concept for improving MAP technology.
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JOURNAL OF MEMBRANE SCIENCE
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2025
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IF 9
Jinwei Zhang,Yujun Zhang,Ning Li,Shilin Nie,Leixin Yang,Yihao Luan,Yuchao Ma,Ge Wang,Kaihua Li,Long Jiao,Bowen Cheng
Physical aging presents a significant challenge that hinders the practical application of high-permeability polymer-based membranes. Herein, we have designed a polymer network membrane (PI–CO@Trip-TB (1:10)) featuring H-bonding interactions by regulating the ratio of the carboxyl-containing copolymer PI-CO (6FDA-FDA-DABA) to Trip-TB (Tröger's base), which significantly improved the anti-aging performance without compromising the high permeability. The introduction of PI-CO not only generates H-bonding interactions to enhance compatibility, but also the introduction of its linear chain segments effectively hinders the relaxation of the chain of the Trip-TB spatial structure. Which synergistically stabilizes the free volume elements and mitigates the rate of their temporal collapse. Compared to Trip-TB, the PI-CO@Trip-TB (1:10) polymer network membrane demonstrates outstanding anti-aging performance, in which the permeability of CO 2 and O 2 is maintained at approximately 60 % even after 90 days. Notably, the performance of both fresh and aged PI-CO@Trip-TB (1:10) membranes surpasses the 2008 Robeson upper bound (CO 2 /CH 4 ) and the 2015 Robeson upper bound (O 2 /N 2 ). Overall, this study establishes an effective strategy for designing high-permeability polymers with anti-aging properties for practical applications in separation membranes.
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INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
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2025
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IF 3.9
Wenting Zhou,Yongkang Huang,Xiaofeng Gao,Zixuan Ma,Ziyu Song,Lili Lin,Ding Ma,Siyu Yao
Pt/α-MoC catalysts, synthesized by supporting platinum on α-phase molybdenum carbide (α-MoC), have emerged as promising candidates for the low-temperature water–gas shift reaction (WGSR) due to their high catalytic activity. However, their performance is often limited by insufficient density of active Pt–Mo interfacial sites and inadequate stability under reaction conditions. In this study, a ternary Pt/α-MoC/MFI catalyst was constructed by incorporating MFI-type zeolites with varying Si/Al ratios as a support component. Comprehensive characterization revealed that modulating the Si/Al ratio of the zeolite support alters the carburization process, with silica-rich supports promoting the formation of a more optimal molybdenum carbide structure and effectively suppressing carbon deposition during reaction. In addition, the use of high-silica supports increased the number of active Pt–Mo interfacial sites and enhanced key steps such as water dissociation and –OH group conversion. Consequently, the Pt/α-MoC/S-1 catalyst─synthesized using purely siliceous S-1 zeolite as the support─exhibited the highest intrinsic activity of 7.4 molCO/molPt/s at 523 K, outperforming all other zeolite-supported Pt/α-MoC catalysts as well as the bulk Pt/α-MoC catalyst.
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Journal of Future Foods
·
2025
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IF 7.2
Jinju Ma,Lijuan Yu,Kun Li,Hong Zhang,Baoshan Tang,Juan Xu,Lanxiang Liu
The rapid deterioration of fresh-cut fruits and vegetables remains a critical challenge to food safety and sustainability, highlighting the need for natural preservation strategies. Herein, we presented a bio-inspired shellac gel/chitosan (SG/CS) edible coating with gas-permeation control to extend the shelf life of fresh-cut lotus root. Molecular dynamics simulations revealed that shellac, as an atypical amphiphile, self-assembled under glucono delta-lactone induction through hydrophilic and hydrophobic interactions into transient vesicles or micelles, which aggregated into a porous gel network. Shellac gel particles incorporated into chitosan coatings retained abundant nanoporous structure upon drying on fresh-cut lotus root, modulating gas permeability and enabling a gas-permeation controlled edible coating. Acute oral toxicity tests in mice (LD₅₀ > 15,000 mg kg⁻¹) confirmed the coating to be practically non-toxic. Functionally, SG/CS coatings suppressed respiration rate, ethylene release, moisture loss, and enzymatic browning, maintaining color, texture, and nutritional quality of lotus root by modulating the surrounding gas microenvironment. Notably, the 0.1% SG/CS coating achieved superior preservation effects, extending freshness of fresh-cut lotus root to 8 days. This study introduces a safe and efficient preservation strategy and provides a promising alternative to conventional antibacterial or antioxidant coatings in the development of edible coatings for fresh-cut produce.
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JOURNAL OF MEMBRANE SCIENCE
·
2025
·
IF 9
Liyuan Chen,Guannan Chen,Zhiwei Zhao,Xiaolu Chen,Jinhui Pang,Zhenhua Jiang
Polymers of intrinsic microporosity (PIMs), as extremely promising materials for gas separation membranes, it is crucial to deeply investigate the relationship between their structures and properties. However, current efforts in PIMs structural development focus primarily on screening tetraphenol monomers with suitable contorted units, while systematic studies on the precise structural design of tetrafluorinated monomers and the corresponding structure-property relationships of the resulting PIMs remain scarce. In this study, a novel tetrafluorinated monomer featuring Schiff base units, namely 2,3,6,7-tetrafluoro-N9,N10-diphenylanthracene-9,10-diimine (TFNAD), was synthesized. A series of its derivatives with substituents of different sizes and positions (ortho-methyl, meta-methyl, meta-trifluoromethyl) was also developed. These monomers were then copolymerized with TTSBI and TFTPN to prepare a series of PIM-TFNAD-X copolymers. The influence of the substituents on the chain packing behavior, BET surface area, and pore size distribution of this series was systematically investigated, thereby revealing their impact on gas separation performance and physical aging behavior. Notably, the ortho-methyl substituted polymer (PIM-TFNAD-oMe), benefiting from the effect of the methyl in effectively disrupting the dense packing of polymer chains and restricting C-N bond rotation, significantly enhanced gas permeability while simultaneously maintaining selectivity, overcoming the permeability-selectivity trade-off to some extent. Furthermore, the separation performance of PIM-TFNAD-X was also evaluated under 15/85 CO 2 /N 2 mixed-gas conditions. This study not only introduces structurally tunable novel tetrafluorinated monomers to enrich the PIMs material library but also offers new insights into understanding their structure-property relationships.
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