CHROMATOGRAPHIA
·
2019
·Vol. 82
·期 6
·953-960
·
IF 1.552
Zhang Xiaoyu,Chen Jie,Lian Lili,Wang Xiyue,Guo Xiaoyang,Chen Huijun,Zhu Bo,Hou Shuang,Lou Dawei
A novel needle extraction device packed with heat-resistant fibers coated with perhydroxy cucurbit[6]uril by sol–gel technology was first developed for the analysis of polycyclic aromatic hydrocarbons in actual water samples. Its performance was tested via purge and trap microextraction coupled with gas chromatography. The strong adsorption affinity between polycyclic aromatic hydrocarbons and (OH) 12 Q[6] was attributed to C–H··· π interactions and π – π interactions. The parameters of the extraction device, such as extraction volume, extraction temperature, desorption time, ionic strength, and fiber number, were optimized. Under optimized conditions, the as-prepared extraction device showed good linearity within 0.5–1,500 µg L −1 with low detection limits (0.03–0.2 µg L −1 ). Moreover, the durability of the needle extraction device was excellent and can be used for 60 cycles. Furthermore, the loss rates of the coating fiber were less than 10% after storage for 3 days at room temperature, and the RSD was less than 6.4%.
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2022
·
IF 5.518
Huanhuan Liu,Meng Chen,Yingnan Duan,Xiaohuan Jiang,Jiayu Liao,Mengkui Tian
In this work, macrocyclic molecule cucurbit[6]uril (CB[6])-modified two-dimensional black phosphorus nanosheets (BPNSs) used as photoactivated support were synthesized by a simple solvothermal method . Palladium nanoparticles were anchored on the surface of BP-CB[6] to obtain the composite material Pd/BP-CB[6] by using a chemical reduction method. Then, the electrocatalytic activity of the composite material modified electrode in the ethanol oxidation reaction (EOR) was investigated. The Pd/BP-CB[6] catalyst exhibits a high mass activity (1420 mA·mg Pd −1 ), which is 4.1 times higher than commercial Pd/C. Impressively, the ethanol oxidation activity of the Pd/BP-CB[6] electrode under visible light irradiation (1900 mA·mg Pd −1 ) is 1.34 times higher than under dark conditions. The result is obtained through a series of evaluations, including cyclic voltammetry , chronopotentiometry , chronoamperometry , and electrochemical impedance spectroscopy , in which the prepared Pd/BP-CB[6] shows higher catalytic activity and stability than Pd/BP. These results suggest that the synergistic effect of photocatalysis and electrocatalysis improves the electron transport kinetics of the Pd/BP-CB[6] electrode in the EOR process. Two-dimensional black phosphorus nanosheets can be used as promising photoactivated supports, to which functional material CB[6] is fixed by hydrogen bonding . Meanwhile, the electrostatic interaction between CB[6] and noble metal helps to improve the stability of the catalyst. This work provides a new idea for developing efficient photoresponsive electrode material in direct ethanol fuel cells.
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POLYMER INTERNATIONAL
·
2021
·Vol. 70
·期 9
·1376-1385
·
IF 2.99
Yanli Li,YeFang Yang,Xinqi Pei,Yu Li,Yuhui Yuan,Xiaoling Huang
Cucurbit[6]uril-derivatized vinyl monomer (cucurbit[6]uril methacrylate) was synthesized. Acrylic acid (AA) was used as the comonomer for copolymerization with the cucurbit[6]uril-derivatized monomer. A series of copolymers of poly(acrylic acid- co -cucurbit[6]uril methacrylate) (PAA- co -CB[6]MA) were synthesized by free radical polymerization. The cucurbit[6]uril-derivatized monomer and PAA- co -CB[6]MA copolymers were characterized by 1 H NMR spectra, high-resolution mass spectroscopy and gel permeation chromatography. The solution behavior was examined using UV–visible spectroscopy and dynamic light scattering. The PAA- co -CB[6]MA showed an upper critical solution temperature (UCST) in water. The UCST-type thermoresponsive behavior of these CB[6]-derivatized copolymers was highly dependent on the composition of the copolymer. For the same type of copolymer, changes in its composition gave rise to different UCSTs. Additionally, the PAA- co -CB[6]MA copolymers were successful in trapping azocarmine B. The stimuli-responsive release of encapsulated azocarmine B was achieved by a combination of temperature and pH value stimuli. According to the results, the novel PAA- co -CB[6]MA copolymers can be used as carriers. © 2021 Society of Industrial Chemistry.
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TALANTA
·
2019
·
IF 4.916
Yujuan Cao,Song Wang,Wei Wu,Hong Peng,Ying Yu,Debin Zhu
An efficient fluorescent probe based on cucurbit[6]uril modified CdTe quantum dots (CB[6]@QDs) was prepared. This novel probe showed significant and selective fluorescence quenching and complexation capacity to p-nitroaniline, its interaction mechanism was studied by both experimental and theoretical methods. Furthermore, a fluorescent method was developed for the determination of p-nitroaniline in different environmental samples. The fluorescence intensity of CB[6]@QDs showed a good linearity response to p-nitroaniline in the concentration range of 2.5 × 10 −7 -3.0 × 10 −6 mol/L with a correlation coefficient (R 2 ) of 0.9976, the limit of detection (LOD) was 6 × 10 −8 mol/L and the limit of quantification (LOQ) was 2 × 10 −7 mol/L. Moreover, about 0–1.5 × 10 −6 mol/L p-nitroaniline were determined in environmental samples, the recoveries were in the range of 88–109% with the relative standard deviations (n = 3) of 1.2–4.5%. Compared with previous fluorescent methods, the present method shortened and simplified the sample pretreatment as well as enhanced the sensitivity and selectivity of analytical method. No further sample pretreatment procedure is needed and the LOD of present method was one order of magnitude less than previous fluorescent methods, showed it is a simple, selective and sensitive method.
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Journal of Water Process Engineering
·
2025
·
IF 6.7
Liling Zeng,Xianyan Ao,Manli Xu,Yunqian Zhang,Zhu Tao
The synergistic removal of organic pollutants by adsorption and photocatalysis can be achieved by adsorption of enriched pollutants, followed by photocatalytic degradation to decompose the pollutants into non-toxic substances. In this work, a category of adsorption-photocatalytic bifunctional composite materials Q[6]-HPAs have been developed through the self-assembly of cucurbit[6]uril (Q[6]) and heteropoly acids (HPAs) like phosphomolybdic acid (PMA), phosphotungstic acid (PTA) and silicotungstic acid (STA). These composites exhibit enhanced surface area, structural stability, and extended light absorption into the visible range. Notably, Q[6]-HPAs have surface charge properties that attract cations and an energy band structure suitable for the generation of reactive oxygen species, thus possessing the potential for efficient adsorption and photodegradation of cationic pesticides. Among which, Q[6]-PMA and Q[6]-PTA removed over 95 % of diquat and paraquat through sequential adsorption and photodegradation. Electrostatic attraction drives the adsorption process, and ·O 2 − and ·OH radicals detected via Electron Spin Resonance (ESR) are the key to photodegradation. Ultimately, Liquid Chromatography-Mass Spectrometer (LC-MS) analysis revealed potential degradation intermediates and products, and toxicity analysis was performed.
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RSC Advances
·
2021
·Vol. 11
·期 6
·3470-3475
·
IF 3.361
Ye Meng,Weiwei Zhao,Jun Zheng,Daofa Jiang,Jie Gao,Yanmei Jin,Peihua Ma
Since the first reportal on decamethylcucurbit[5]uril (Me10Q[5]) in 1992, substituted cucurbit[n]urils have attracted considerable research interest. In this study, the host–guest modes between the tetramethyl cucurbit[6]uril (TMeQ[6]) as a host and 4-chloroaniline and 4,4′-diaminostilbene (G1 and G2) as guests were investigated by single-crystal X-ray diffraction, NMR, ITC, UV-Vis spectrum, and MALDI-TOF mass spectrometry analyses. The experimental results showed that TMeQ[6] formed a 1 : 1 inclusion compound with G1, and the carbonyl portal of TMeQ[6] formed a 1 : 1 self-assembly with G2. Further, multi-dimensional supramolecular frameworks were formed driven by weak interaction forces in the system (hydrogen bonding, C–H⋯π interactions, ion–dipole interactions, and dipole–dipole interactions).
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JOURNAL OF MEMBRANE SCIENCE
·
2020
·
IF 7.183
Jing Cai,Xue-Li Cao,Yi Zhao,Fu-Yi Zhou,Zhaoliang Cui,Yong Wang,Shi-Peng Sun
In this work, annular supramolecular cucurbit[6]uril (CB6) and dendritic polyamidoamine (PAMAM) were employed to construct high-performance nanofiltration (NF) membranes via one-step interfacial polymerization (IP) process. The obtained membrane features not only the enlarged polyamide tunnels based on the large steric hindrance of CB6 and PAMAM but also the novel hydrophobic rotaxane tunnels based on the host-guest chemistry between CB6 and piperazine (PIP) or PAMAM. The CB6/PAMAM-modified membrane achieved nearly four times enhancement of pure water permeability (PWP) compared to the unmodified traditional membranes with still high Na 2 SO 4 rejection. This indicates the positive contribution of CB6/PAMAM-modification to overcome the “trade-off” effect limiting NF development. In addition, the modified membrane shows the industry-leading separation performance for monovalent and bivalent anions due to the cooperation between the modified pore-size and surface charge. More valuably, CB6/PAMAM-modified membrane manifests the strong anti-fouling property not only in inorganic salt system but also in organic pollutant system based on the modified surface characteristics, indicating its broader application fields. This provides a feasible method to prepare a high-performance anti-fouling NF membrane.
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TALANTA
·
2018
·
IF 4.244
Qian Zhang,Dong-Dong Zhou,Jia-Wei Zhang,Die Gao,Feng-Qing Yang,Hua Chen,Zhi-Ning Xia
In this study, a novel amino-terminated supramolecular cucurbit [6] uril (CB [6]) pseudorotaxane motif coated magnetic nanoparticles (MNPs) was successfully fabricated through cucurbit [6] uril promoted azide-alkyne cycloaddition. The physicochemical properties of the obtained functional MNPs were investigated by scanning electron microscope, transmission electron microscope, energy dispersive X-ray spectroscopy, Fourier transform infrared spectroscopy, X-ray diffractometer, vibrating sample magnetometer, thermal gravimetric-derivative thermogravimetric analysis , and Zeta potential analyzer. Due to the abundant carboxyl groups in the structure of CB [6] and amino residue on the surface of the pseudorotaxane motif MNPs, the prepared materials were employed to extract salvianolic acids (SAs) for the first time. A series of significant parameters in the extraction and elution process, including sample pH, acetonitrile percentage, ionic strength and extraction temperature, as well as eluent type and desorption time, were examined systematically. Based on the results, the electrostatic interaction , van der Waals interaction , hydrophilic interaction and hydrogen bonding formation between the analytes and sorbent were speculated. The equilibrium state of static adsorption study indicated the outstanding adsorption capacity of pseudorotaxane motif MNPs toward six SAs to be 15–80 mg/g, providing much better adsorption affinity for SAs compared with MNPs only modified with amino, and their adsorption behaviors were all fitted with Freundlich adsorption isotherm model. In addition, the developed pseudorotaxane motif MNPs offered good recyclability and stability. Taking advantage of these merits, four SAs from Salvia miltiorrhiza Bunge were successfully extracted using the prepared pseudorotaxane motif MNPs with relative recovery in the range from 95.1% to 106.5% and RSDs below 9.7%. These results demonstrated that the synthesized pseudorotaxane motif MNPs showed potential as a candidate in the extraction of SAs.
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JOURNAL OF MEMBRANE SCIENCE
·
2025
·
IF 9
Mei-Ling Liu,Ying Tang,Lu Li,Yuanyuan Rao,Shi-Peng Sun,Weihong Xing
The adhesion of bacteria from aquatic environments onto membrane surfaces can severely compromise the membrane’s fluorinated compound rejection efficiency. While graphene oxide membranes demonstrate potential for pollutant separation, their practical application is constrained by interlayer swelling and interfacial instability. This study developed a reduced graphene oxide (rGO) composite membrane cross-linked via supramolecular host-guest interactions and ionic synergy, using cucurbit[6]uril (CB6) and silver ions, supported on polyaniline/polyimide electrospun nanofibers. CB6 formed stable complexes through ion-dipole interactions of polar carbonyl groups with silver ions, while cation-π interactions of silver ions with rGO establish a ternary cross-linked network, effectively suppressing interlayer swelling and precisely tuning nanochannel size. The membrane achieves a 98.2% rejection rate for perfluorooctanoic acid. Additionally, silver ions, CB6, and rGO endow the membrane with long-lasting antibacterial properties, exhibiting a 99.6% inhibition rate against Escherichia coli . This supramolecular synergistic strategy offers a novel approach for designing multifunctional membranes with high-efficiency separation and anti-biofouling performance.
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Small
·
2020
·Vol. 16
·期 39
·2002718
·
IF 11.459
Daping Qiu,Min Li,Cuihua Kang,Jinying Wei,Feng Wang,Ru Yang
The intrinsic properties of carbon-based material and the voltage window of electrolyte are the two key barriers to restrict the energy density of carbon-based supercapacitors (SCs). Herein, a cucurbit[6]uril-derived nitrogen-doped hierarchical porous carbon (CBC x ) with unique pore structure characteristics is synthesized and successfully applied to construct SCs based on different electrolyte systems. Owing to narrow pore size distribution (0.5–4 nm), colossal ion-accessible pore volume, prominent supermesopore volume, and reasonable heteroatom configuration, the CBC x -based SCs demonstrate excellent electrochemical performances with high operating voltages in two distinct systems. The optimal SCs can output a maximum energy/power density of 18 Wh kg −1 (11.1 Wh L −1 )/20 kW kg −1 (12.3 kW L −1 ) with an operating voltage of 1.2 V in potassium hydroxide aqueous electrolyte, as well as an ultralong cycle life of up to 50 000 cycles (0.046% decay per 100 cycles). Furthermore, the optimal SCs deliver an exceptionally high energy/power density of 95 Wh kg −1 (58.4 Wh L −1 )/70 kW kg −1 (43 kW L −1 ) with an ultrahigh operating voltage of 3.5 V in 1-ethyl-3-methylimidazolium tetrafluoroborate electrolyte. This work opens up a new application field for cucurbit[6]uril and provides an alternative avenue for optimizing the performances of carbon-based materials for SCs.
研究领域:
材料科学
·
能源存储技术
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CHEMISTRY-A EUROPEAN JOURNAL
·
2017
·Vol. 24
·期 9
·2242-2248
·
IF 5.317
Dandan Jiang,Xiqian Li,Qiong Jia
Graphical A facile synthetic strategy based on host–guest interactions was developed to prepare multilayer cucurbit[6]uril-based magnetic nanoparticles, MNPs-(HA-DAH 5 /HA-CB[6] 5 ). The compound was employed as a blood purification material for the removal of LDL from plasma because it had good blood compatibilitiy and could be easily separated with an external magnet. Efficient removal of low density lipoprotein (LDL) is a key challenge due to its high level in plasma as a primary risk factor in the pathogenesis of atherosclerotic cardiovascular disease. In this work, a facile synthesis strategy based on host–guest interactions was developed to prepare multilayer cucurbit[6]uril-based magnetic nanoparticles, MNPs-(HA-DAH 5 /HA-CB[6] 5 ). The compound was employed as a blood purification material for the removal of LDL from plasma because it had good blood compatibility and could be easily separated with an external magnet. The efficient removal of LDL was attributed to the electrostatic interactions between the positive charged apoB-100 domain of LDL and the negative charged adsorbent. Moreover, the prepared material exhibited high recyclability and could release LDL in physiological saline for recyclable use. MNPs-(HA-DAH 5 /HA-CB[6] 5 ) offered promising perspectives and broad applications in extracorporeal treatment for the removal of LDL.
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JOURNAL OF MOLECULAR STRUCTURE
·
2024
·
IF 4
Qiqi Wang,Mei Liu,Shuo Wang,Lulu Shi
A novel supramolecular framework [Cd(QDS) 2 ]·(CB[6]) 2 ( 1 ) based on cucurbit[6]uril (CB[6]) and 8-hydroxyquinoline-5-sulfonic acid ion (QDS − ) was successfully synthesized under solvothermal conditions. The single crystal X-ray diffraction analyses indicated that the construction of this supramolecular framework is attributed to the non-covalent interactions between the QDS − and the outer surface of CB[6]. The performance study demonstrates that 1 exhibits a remarkable sensitivity and selectivity in detecting anions Cr 2 O 7 2− , MnO 4 − , furan antibiotics nitrofurantoin (NFT) and nitrofurazone (NFZ) through fluorescence quenching with the limit of detection (LOD) were 95, 89, 132, and 113 ppb, respectively. Meanwhile, due to the remarkable fluorescent properties of 1 , anti-counterfeiting marks were incorporated into the positioning boxes of quick response (QR) codes. The anticounterfeiting signs appear yellow in daylight while exhibit bright green fluorescence when excited at 365 nm. Furthermore, 1 also have been successfully applied to real samples with satisfactory results. These remarkable findings suggest that 1 hold promise as an effective fluorescent sensor.
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