JOURNAL OF MEMBRANE SCIENCE
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2026
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IF 8.8
Xupeng Li,Hyeon Keun Cho,Shuai Yang,Shuwei Li,Gang Wang,Young Moo Lee
This research was dedicated to the development of high-performance proton exchange membranes (PEMs) via the synthesis of two sulfonated poly(benzothiazole)-b-poly(benzimidazole) (sPBTx-PBI) block copolymers.The structural difference between them is primarily in the length of their hydrophilic chains. Excellent solubility was achieved through the incorporation of hexafluoroisopropyl and phenylphosphine oxide units. Partially cross-linked PEMs (sPBTx-PBI-y) were subsequently fabricated via thermal cross-linking of the hydrophobic PBI segments. The elongation of the hydrophilic block was found to promote water uptake, swelling, and proton conductivity at the expense of oxidative stability. Cross-linking effectively mitigated swelling and greatly improved durability while preserving high proton conductivity. The proton conductivity of the sPBT12-PBI-20% membrane reached 0.115 S cm −1 at 80 °C and 100% RH—exceeding Nafion 117—and maintained a stable operating voltage of 0.79 V over 20 h. Under anhydrous 200 °C conditions, single-cell power densities reached up to 510 mW cm −2 . These results demonstrate that partially cross-linking of sPBT-PBI block copolymers provides a promising pathway toward mechanically robust and highly conductive PEMs for wide-temperature fuel cell applications.
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CHEMICAL ENGINEERING JOURNAL
·
2025
·
IF 13.2
Mingxi Yang,Zhenlong Zhang,Huafang Zhang,Yuefeng Liu,Huiping Gao,Yanli Mao
The two-step sequential deposition method has been widely applied to fabricate the perovskite films due to its better reproducibility and easy operation. The perovskite film is formed by a reaction of the pre-deposited PbI 2 film with organic amine salts. Therefore the microstructure and crystal orientation of the pre-deposited PbI 2 are crucial for preparing high-quality perovskite film. However, controlling the growth of the pre-deposited PbI 2 is a challenge. Herein, we added an additive of 1, 4-dichlorobenzene (DCB) to the PbI 2 precursor solution. The DCB molecule connects two crystal planes of the PbI 2 through an interaction between the Pb 2+ and the two Cl − in DCB, which induces the formation of a layered structure PbI 2 , and the growth along with the (001) plane to form an orientated PbI 2 film. Thus high-quality perovskite films with reduced defect states, improved charge transfer efficiency, and better energy level structure were obtained. Consequently, a high efficiency of 24.27% was achieved for the perovskite solar cells (PSCs) with DCB additive. Moreover, the stability of the PSCs was improved. The unencapsulated devices remain 82.6% of the initial efficiency after aging for 1100 h in air.
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TALANTA
·
2026
·
IF 6.1
Chu Zeng,Hong-Tao Jiang,Ming Xu,Zhi-Yuan Gu
Flexible metal–organic frameworks (MOFs) with dynamic adaptability offered exciting opportunities for advanced separation, yet their tendency to undergo void collapse severely limited their application as gas chromatography (GC) stationary phases. Here, we overcame this challenge by stabilizing the scu -topology Zr-MOF NU-903 through a linker installation strategy. By incorporating biphenyl-4,4′-dicarboxylic acid (BPDC) into the vacant coordination pockets along the c-axis, the resulting material, NU-903-BPDC, exhibited markedly enhanced stability and structural rigidity, retaining its porosity even at 250 °C. Comprehensive characterization confirmed that the original structure was preserved, while framework flexibility was effectively suppressed. Fluorescence spectroscopy further revealed restricted ligand dynamics, corroborating the rigidified framework environment. When employed as a GC stationary phase, NU-903-BPDC delivered significantly improved resolution for C 7 hydrocarbons and dichlorobenzene isomers, benefitting from stronger thermodynamic interactions and reduced band broadening. Crucially, NU-903-BPDC maintained stable separation performance after thermal treatment, in sharp contrast to the pronounced degradation observed for pristine NU-903. This work demonstrated linker installation as an effective strategy to modulate framework flexibility, opening a general pathway toward robust, high-performance MOF-based stationary phases for chromatographic separations.
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JOURNAL OF CHROMATOGRAPHY A
·
2023
·
IF 4.1
Ziqi Sun,Meiling Qi
This work reports the investigation of a new poly(propylene-carbonate) copolymer terminated by the adamantane cages (APPC) as the stationary phase for gas chromatographic (GC) analyses. In GC, the selectivity of a stationary phase is the key factor that governs the column separation performance for analytes, particularly those of high similarity in structures and properties. As such, we employed more than a dozen of isomer mixtures of separation difficulty for investigating the separation performance of the APPC column, involving the isomers of alkanes, alkylbenzenes, halobenzenes phenols and anilines. Meanwhile, the column coated with poly(propylene carbonate) diol (PPCD) differing from APPC only in their terminal groups and two commercial columns coated with polyethylene glycol (PEG) and polysiloxane, respectively, were used as the reference columns. The separation results evidenced the distinctly advantageous performance of the APPC column over the reference columns. Moreover, the APPC column showed excellent repeatability and reproducibility with the relative standard deviation (RSD) values over the range of 0.01%–0.04% for run-to-run, 0.15%–0.28% for day-to-day and 3.4%–3.9% for column-to-column ( n = 4). Its application to GC–MS analysis of the verbena essential oil demonstrated its separation advantages for a wide range of components in practical samples. Up to date, the adamantyl-terminated poly(ether-carbonate) copolymers have not been reported in any fields. Its high-resolution performance demonstrates the feasibility of adamantyl-terminated block copolymers as highly selective stationary phases for GC analyses, which offers a vast room for fundamental researches and applications.
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SCIENCE OF THE TOTAL ENVIRONMENT
·
2023
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IF 9.8
Belay Tafa Oba,Xuehao Zheng,Moses Akintayo Aborisade,Akash Kumar,Ashenafi Yohannes Battamo,Jiashu Liu,Azhar Ali Laghari,Peizhe Sun,Yongkui Yang,Lin Zhao
Soil pollution caused by complex organochloride mixtures has been increasing in many parts of the world in recent years; as a result, countless numbers of people are exposed to dangerous pollutions; hence, the treatment of organochlorides-polluted soils is gaining considerable attention. In this study, the potential of unactivated peroxymonosulfate (KHSO 5 ) in remediating soil co-contaminated with trichlorophenol, para-dichlorobenzene, and para-chloro-meta-cresol was investigated. In addition, the treatment's collateral effect on critical soil properties was explored. The result revealed that treating 10 g of soil with 20 mL of 5 mM KHSO 5 for 60 min could oxidize 70.49% of the total pollutants. The pH of the soil was decreased following the treatment. The significant decrease, ( p < 0.05), in the soil organic matter following the remediation has affected cation exchange capacity, and available nitrogen. It was also observed that the treatment reduced the β-glucosidase, urease, invertase, and cellulase activities significantly, ( p < 0.05). The treatment, on the other hand, brought negligible effects on available phosphorus, available potassium, and particle size distribution . The phytotoxicity tests, which included seed germination and root elongation and soil respiration tests revealed that the treatment did not leach toxins into the treated soil. The treatment method was found to be relatively ecofriendly and cost effective.
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Materials Today Communications
·
2023
·
IF 3.8
Jin Han,Taolei Qiu,Dan Wu,Yue Zhai,Michael R. Bockstaller,Xiaolin Zhang,Jianchao Zhao
Dimethyl phenol (DMP) oligomers are a side product of industrial poly(phenylethyl ether) (PPE) fabrication and significantly contribute to the environmental burden associated with PPE application. Here, a new process for the upcycling of waste-derived DMP into hyper-crosslinked porous polymer networks through Friedel-Crafts alkylation with p - dichloroxylene as an external crosslink agent is presented. The resulting hypercrosslinked porous polymers exhibited a maximum BET surface area of 740 m 2 /g and displayed and adsorption capacity of 5.9 wt% and 0.85 wt% towards CO 2 (at 1.0 bar, 298 K) and H 2 (at 1.0 bar, 77.3 K), respectively. Form stability of micro- and mesopores was attributed to the rigidity of the aromatic network structure. The results suggest new opportunities for the upcycling of DMP-waste components for applications such as carbon capture that could reduce the negative environmental const associated with the fabrication and application of PPE and related engineering polymers .
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JOURNAL OF CHROMATOGRAPHY A
·
2022
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IF 4.601
Ziqi Sun,Meiling Qi
This work presents the investigation of a novel CO 2 -based poly(ether-carbonate) copolymer, namely poly(propylene ether-carbonate)diol (PPCD), for gas chromatographic (GC) analyses. The PPCD column exhibited column efficiency of 4000 plates/m determined by naphthalene at 120 ℃ with the retention factor 6.23. Its separation performance was investigated by adopting a wide variety of analytes and isomers, including the isomer mixtures of alkanes, substituted benzene isomers with diverse groups, phenols and anilines, and the mixtures of organic solvents of high volatility, aliphatic amines and N-heterocycles. As a result, the PPCD column displayed distinctly higher resolving capability than the commercial columns described herein and achieved high column inertness towards acidic/basic analytes without involving any deactivation procedure. Additionally, it displayed excellent separation repeatability and reproducibility with the relative standard deviation (RSD) values less than 0.01% for within-day and in the range of 0.26% – 0.36% for between-day and 3.0% – 4.1% for between-column ( n = 4). Further, the PPCD column (30 m) was used to GC–MS analysis of the lemongrass essential oil and resolved more components well than the indicated commercial columns, evidencing its outstanding separation performance for analyses of complex samples. Up to date, the CO 2 -based poly(ether-carbonate) copolymers are not reported in the field of chromatography. This work demonstrates their promising future as a new type of selective and inert stationary phases for practical GC analyses.
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RSC Advances
·
2022
·Vol. 12
·期 25
·16131-16140
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IF 4.036
Qiu-Ping He,Ying-Ying Wang,Peng-Fei Wang,Xiao-Ming Dou
Zeolite–polymer composite membranes have become promising and effective materials for the pervaporative separation of liquids, especially for isomeric mixtures. In this paper, silicalite-1/PDMS composite membranes have been used to investigate the separation of dichlorobenzene (DCB) isomers via pervaporation for the first time. Silicalite-1 zeolites modified by the silane coupling agent, NH3–C3H6–Si(OC2H5)3, have been incorporated into polydimethylsiloxane (PDMS). Then, the silicalite-1/PDMS composite membranes have been successfully prepared on porous polyvinylidene fluoride (PVDF) supports. The morphology and structure of the silicalite-1 zeolites and silicalite-1/PDMS composite membranes have been characterized by XRD, FTIR, SEM and BET techniques. The results show that the modified silicalite-1 zeolite particles have smaller pore sizes dispersed more uniformly in the active layers of the silicalite-1/PDMS composite membranes and present fewer aggregation and pinholes formed by the accumulation of zeolite particles. The silicalite-1/PDMS composite membranes are all dense and continuous with good homogeneity. To evaluate the pervaporative separation performance of the DCB isomers, the unmodified and modified silicalite-1/PDMS composite membranes have been further tested in single-isomer and binary-isomer systems at 60 °C. The modified silicalite-1/PDMS composite membranes present higher DCB isomer separation factors. The separation factors of the modified silicalite-1/PDMS composite membranes in the binary-isomer systems for p-/o-DCB and p-/m-DCB are 3.53 and 5.63, respectively. The permeate flux of p-DCB through the modified silicalite-1/PDMS composite membranes in the p-/o-DCB binary-isomer system is 116.7 g m−2 h−1 and in the p-/m-DCB binary-isomer system, it is 93.5 g m−2 h−1. The result provides a new approach towards the pervaporative separation of DCB isomers from their mixture for future industrialization applications.
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ENVIRONMENT INTERNATIONAL
·
2022
·
IF 13.352
Yahui Liu,Zhijuan Wang,Wan Wang,Jiangtao Xing,Qing Zhang,Qiang Ma,Qing Lv
This paper reports the non-targeted analysis of unknown volatile chemicals in medical masks through headspace gas chromatography-Orbitrap high-resolution mass spectrometry. In view of the difficulties that may be encountered in the qualitative analysis of unknown substances, several typical cases and the corresponding reliable solutions are given from the perspective of comprehensive score and retention index, chemical ionization identification molecular formula, fragment ion detail comparison for distinguishing isomers, and identification of alkanes. With this method, 69 volatile substances were identified in 60 masks. The identified substances were divided into nine categories. Alkanes, esters, benzenes, and alcohols were the top four groups of substances identified in masks and accounted for 34.8%, 15.9%, 10.1%, and 7.2% of the total substances, respectively. In addition, ketones, ethers, phenolics, amides, and other substances were identified. Ethanol, 1,4-dichlorobenzene, toluene, m -xylene, dimethyl glutarate, and N,N-dimethylacetamide had high detection rates. The identified substances were further filtered and screened according to their detection rate, toxicity, and response intensity. Finally, 12 high-risk volatile chemicals in medical masks were listed. This study could serve as a reference for identifying unknown substances and a guide for monitoring volatile chemicals in masks and promoting chemical safety improvements in products.
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ACS Applied Materials & Interfaces
·
2023
·
IF 9.5
Wen-Chao Deng,Hai-Long Qian,Cheng Yang,Shu-Ting Xu,Xiu-Ping Yan
Covalent organic frameworks (COFs) are promising as stationary phases for gas chromatography (GC). The successful anchoring of COFs to the inner walls of the capillary with good uniformity is an important prerequisite to ensure the excellent separation performance of columns. However, current methods for the fabrication of COF-based capillary columns cannot always meet this requirement when faced with different COFs, which hampers the further development of COF-based GC stationary phases. Here, we show a general two-step method for the fabrication of COF-bound capillary column. The first step enables the formation of uniform amorphous polymer layer on the inner walls of capillary, while the second step allows the facile transformation of the amorphous polymer layer into a highly crystalline COF layer. COF-bound capillary columns with different framework structures were fabricated successfully by the developed two-step method. Impressively, the COF layers bound on the inner walls of these capillary columns showed good uniformity and high crystallinity. More importantly, as an example, the fabricated Tab-DHTA-bound capillary column showed good resolution (R > 1.5) and high column efficiency (700–39,663 plates m–1) for the tested isomers of ethylbenzene, xylene, dichlorobenzene, chlorotoluene, pinene, 1,3-dichloropropene, and propylbenzene with good precision (RSD, run-to-run, n = 5) (retention time, 0.2–0.6%; peak area, 0.5–1.1%; and peak height, 0.5–1.4%). In general, the fabricated Tab-DHTA-bound capillary column exhibited better performance for the separation isomers than commercial columns DB-5 and HP-FFAP. These results indicate that the two-step method is an efficient way to fabricate the COF-bound capillary column with excellent separation performance.
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SENSORS AND ACTUATORS B-CHEMICAL
·
2023
·
IF 8.4
Shishi Shao,Jiaqiang Zhao,Wei Wang,Hanbing Nie,Yan Jie Li,Xuepeng Zhang,Cheng Zhi Huang,Peng Fei Gao
Host-guest doping room-temperature phosphorescence (RTP) materials have showed excellent potential for ultra-sensitive detection due to its bright luminescence in presence of trace guests. However, the inherent signal fluctuation of solid-state sensors restricts their widespread applications. Herein we constructed a simple internal standard method to overcome the signal fluctuation problem in RTP spectral analysis. Ultralong organic RTP can be obtained by using 1,4-dichlorobenzene (DCB) as a host and trace gaseous NL as a guest through the host-guest doping strategy. In this study, a dual-emission ratiometric phosphorescent probe pyrene (Py)/pentachloropyridine (PCP)-DCB was constructed by using the Py/PCP system fabricated via melt-casting as the reference afterglow and using the DCB as the stimuli-responsive unit of gaseous NL. This probe can be used for visual identification and content detection of NL in commercial mothballs. The ratio of phosphorescence intensity (I485/I595) was linearly related to the mass of added NL (mNL) within the range of 0.05–1.45 mg in this ratiometric RTP platform, and had a low detection limit of 0.012 mg. Furthermore, the NL content of five commercially available mothballs with different NL content was detected by this Py/PCP-DCB platform, and it had good performance compared to the gas chromatography (GC) analysis results.
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CHEMICAL ENGINEERING JOURNAL
·
2023
·
IF 15.1
Xiaoying Feng,Yixin Kuang,Suxin Zhou,Juan Zheng,Gangfeng Ouyang
The substitution position of functional group is potential to affect the microstructure and adsorption performance of functionalized polystyrene (PS) nanospheres, yet to be explored. In this study, a series of hyper-crosslinked PS nanospheres with isomeric chlorine substitution have been prepared by emulsion polymerization and Friedel-Crafts reaction. The detailed characterizations indicated that the substitution position of chlorine greatly influenced the pore volume and specific surface area of constructed PS nanospheres, and the hyper-crosslinked ortho -Cl-functionalized nanospheres ( o - x ClFNs) possessed the highest specific surface area and largest pore volume, followed by para - and meta -Cl-functionalized nanospheres ( p - x ClFNs and m - x ClFNs). Besides, these PS nanospheres were fabricated as even solid phase microextraction (SPME) coatings to study their extraction performance for substituted benzenes, chlorobenzenes, polychlorinated biphenyls (PCBs) and polybrominated biphenyls (PBBs). The experimental results showed that the p - x ClFNs possessed the most outstanding extraction efficiencies for halogenated organic pollutants, and it was combined with gas chromatography-mass spectrometry (GC–MS) to develop a highly sensitive method, realizing the precise quantifications of trace PCBs and PBBs in environmental water. Our work provided invaluable insights on the choice of functional monomer to construct high-performance adsorbent, also demonstrated the important function of PS on the enrichments of organic pollutants.
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