JOURNAL OF SOLUTION CHEMISTRY
·
2022
·Vol. 51
·期 7
·735-751
·
IF 2
Zhao Zhongqian,Chen Xiumin,Wu Jian,Wang Wenjing,He Bingyang,Yin Qi,Xu Peilin,Liu Li
Density functional theory was used to study the effect of N , N -diethylacetamide (DEAc) in the preparation of ferrous oxalate dihydrate. The calculation results indicated that DEAc molecules can affect the growth of ferrous oxalate dihydrate crystals by hydrogen bonding and van der Waals forces with \({\text{C}}_{2} {\text{O}}_{4}^{2 - }\) or H 2 O in ferrous oxalate dihydrate crystals. DEAc encases ferrous oxalate dihydrate crystals to inhibit crystal growth, and preferentially binds to both sides of \({\text{C}}_{2} {\text{O}}_{4}^{2 - }\) to control the axial growth of ferrous oxalate dihydrate crystals. The experimental program was conducted based on these theoretical calculation results. Rod-shaped particles with a particle size of 100 nm were obtained by adding DEAc during the preparation of ferrous oxalate dehydrate. Therefore, DEAc had a significant effect on the particle size of the ferrous oxalate dihydrate. The theoretical calculations were thus confirmed by the experimental results. And this work explains the growth mechanism of the ferrous oxalate dihydrate.
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Small
·
2022
·Vol. 18
·期 15
·2106581
·
IF 15.153
Zhaolin Gou,Huiqi Qu,Hanfang Liu,Yiru Ma,Lingbo Zong,Bin Li,Congxia Xie,Zhenjiang Li,Wei Li,Lei Wang
2D heterostructures provide a competitive platform to tailor electrical property through control of layer structure and constituents. However, despite the diverse integration of 2D materials and their application flexibility, tailoring synergistic interlayer interactions between 2D materials that form electronically coupled heterostructures remains a grand challenge. Here, the rational design and optimized synthesis of electronically coupled N-doped mesoporous defective carbon and nitrogen modified titanium carbide (Ti 3 C 2 ) in a 2D sandwiched heterostructure, is reported. First, a F127-polydopamine single-micelle-directed interfacial assembly strategy guarantees the construction of two surrounding mesoporous N-doped carbon monolayers assembled on both sides of Ti 3 C 2 nanosheets. Second, the followed ammonia post-treatment successfully introduces N elements into Ti 3 C 2 structure and more defective sites in N-doped mesoporous carbon. Finally, the oxygen reduction reaction (ORR) and theoretical calculation prove the synergistic coupled electronic effect between N-Ti 3 C 2 and defective N-doped carbon active sites in the 2D sandwiched heterostructure. Compared with the control 2D samples (0.87–0.88 V, 4.90–5.15 mA cm −2 ), the coupled 2D heterostructure possesses the best onset potential of 0.90 V and limited density current of 5.50 mA cm −2 . Meanwhile, this catalyst exhibits superior methanol tolerance and cyclic durability. This design philosophy opens up a new thought for tailoring synergistic interlayer interactions between 2D materials.
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Frontiers in Chemistry
·
2023
·
IF 5.5
Jia Liu,Su-Hang He,Hugues Lambert,Tung-Chun Lee
Resazurin (Alamar Blue, RZ) is a widely utilized fluorescent probe for biological sensing, whose fluorescent intensity can be modulated by changing its redox states; thereby, electrochemical reactivity of RZ is of significance when designing a sensing assay. Herein, we report novel two-way electrochemical reactivity modulation of RZ using host-guest complexation with rigid molecular containers cucurbit[ n ]uril (CB n , n = 7, 8). The complexation between CB n and RZ is confirmed by 1 H NMR measurements and supported by computational simulation, and the binding constants are determined via UV-vis titration. Notably, the voltametric data highlights that the redox reactivity of RZ can be activated or deactivated upon encapsulation by CB8 or CB7, respectively. This two-way reactivity modulation is hypothesized to be mediated by the difference in cavity volume that favors or hinders the approach of water molecules to the encapsulated reaction center during the reduction process. Despite the similar cavity size to CB, molecular containers such as cyclodextrins (CDs) exhibit considerably weaker modulation effects. Our approach can potentially be applied to other redox processes that involve proton transfer, and open new possibilities in supramolecular electrochemistry.
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Journal of Environmental Chemical Engineering
·
2021
·
IF 5.909
Tao Li,Lin Dai,Yixin Huang,Siwen Pan,Zijun Pang,Jing Zou
Nowadays, a number of spectrophotometric methods for Cr(VI) determination have been developed. Whereas most of them are sensitive to pH, metallic ions, temperature, etc, which render them out of feasibility and may result in erroneous measurement. Therefore, to overcome these drawbacks, a new spectrophotometric method with rapid detection, high accuracy and strong anti-interference ability was established. This method is based on the oxidative coloration of N,N -diethyl- p -phenylenediamine (DPD) and Cr(VI) to generate pink-colored DPD •+ radicals which showed maximum absorbance at 551 nm. Accordingly, different reaction parameters were optimized, the calibration curves (linear range 0.85–60 µM) were established with a high sensibility of (3.05 ± 0.02) × 10 4 M −1 cm −1 . The LOD and LOQ were determined to be 0.26 µM and 0.85 µM respectively, accompanied with a stoichiometric coefficient of near 1:3 (1:2.78). The DPD method exerted a satisfactory accuracy in natural water samples and a pretty good anti-interference performance towards various common co-existing metallic ions. Moreover, this method was successfully applied in the Cr(VI)-sulfite and Cr(VI)-hydroxylamine systems. Overall, the study highlights the DPD method as a promising approach for the Cr(VI) determination and provides a new perspective for the practices of spectrophotometry .
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JOURNAL OF CHEMICAL AND ENGINEERING DATA
·
2021
·
IF 2.694
Xiaoyu Wang,Jiale Wang,Lijun Ji,Bin Wu,Kui Chen,Yanyang Wu
Wastewater containing DMF (N,N-dimethylformamide) and salt is generated in production of many chemicals and medicines. The composition of phase equilibrium should be known primarily for the recovery of DMF from salt-containing wastewater by solvent extraction. In this study, liquid–liquid equilibrium (LLE) and solubility data of water + DMF + chloroform in the presence of NaCl with various concentrations of 0, 2.5, 5.0, 7.5, 10.0, and 13.3 wt % and Na2SO4 with concentrations of 1.5 and 2.5 wt % were determined at T = 298.2 K and atmospheric pressure. Besides, the salt effect on the LLE data was investigated. Compared with the salt-free system, the salt led to an enhancement in the maximum DMF distribution coefficient by 13.4–102.6% for 2.5–13.3 wt % NaCl and 16.2–31.7% for 1.5–2.5 wt % Na2SO4, respectively. Since the distribution coefficient of water increased concurrently, the separation factor barely changed and the two-phase region expanded outward slightly. At the same salt mass fraction, the order of salting-out effect strength on extraction was Na2SO4 > NaCl, which was in good agreement with the Hofmeister series. The reliability of the experimental values was verified through the Eisen–Joffe equation. The NRTL thermodynamic model was applied to correlate the experimental data with a root-mean-square deviation less than 0.0062. The coherent consistency of the model parameters for the salt-free system was checked by topological analysis based on the Gibbs tangent plane test.
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JOURNAL OF CHEMICAL THERMODYNAMICS
·
2020
·
IF 2.888
Meng-Ling Dai,Zhi-Gao Sun
The isochoric stepwise heating method is used to study the effect of liquid hydrocarbon n -tetradecane and n -tetradecane/ n -heptadecane on the equilibrium dissociation conditions of carbon dioxide hydrate. The addition of n -tetradecane or n -tetradecane/ n -heptadecane reduces carbon dioxide hydrate phase equilibrium pressures . As the temperature increases, the promotion effect of the liquid hydrocarbons is more obvious. The promotion effect of n -tetradecane is stronger than that of the mixture of n -tetradecane and n -heptadecane at higher temperature. The quadruple point of carbon dioxide hydrate with the mixture of n -tetradecane and n -heptadecane ( w = 0.3363) is almost the same as that of carbon dioxide hydrate in pure water.
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Crystals
·
2020
·Vol. 10
·期 6
·528
·
IF 2.404
Chao Liu,Weiwei Zhang,Gaigai Cai
Two copper coordination compounds bearing an N,N’-dibenzylethylenediamine ligand, namely [Cu3L(CH3COO)6]n(1) and [(CuCl4)∙(C6H5CH2NH2CH2)2] (2) (L=N,N’-dibenzylethylenediamine) were synthesized by the ethanol refluxing method. Powder X-ray diffraction (PXRD), infrared spectra (IR), elemental analyses, and single crystal X-ray diffraction were used to characterize and verify their structures. Structural analyses showed that the asymmetric unit of compound (1), composed of two Cu(II) cations, three acetate anions, and half of the ligand, was bridged by one acetate to obtain an infinite 1D chain structure. The analyses further showed that the asymmetric unit of compound (2), composed of two crystallographically independent [C6H5CH2NH2CH2]+units, four chloride anions, and one central Cu(II) cation is connected into an infinite 2D network structure by the hydrogen bonding interactions. The copper compounds were used to catalyze the decomposition of H2O2,and the results showed that both of the compounds exhibited excellent catalytic activities under optimized conditions.Keywords:N,N’-dibenzylethylenediamine;crystal structure;catalyst;coordination compound
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MICROCHIMICA ACTA
·
2019
·Vol. 186
·期 12
·1-9
·
IF 5.479
Zhang Cong,Liu Di,Zhang Han,Tan Xingrong,Chen Shihong
A ratiometric electrochemiluminescent (ECL) assay is described for the determination of the calcium(II) regulator calcitonin (CT). The method is making use of (a) graphite-like carbon nitride (g-C 3 N 4 ) as the cathodic luminophore, (b) N-(aminobutyl)-N-(ethylisoluminol) (ABEI) as the anodic luminophore, and (c) peroxodisulfate and dissolved oxygen as coreactants. The luminous potential of g-C 3 N 4 and ABEI can be well distinguished because of their different luminescent properties. Energy transfer between g-C 3 N 4 and ABEI is not observed, and the coreactants peroxodisulate and oxygen do not interfere with each other. Au nanoparticles were functionalized with g-C 3 N 4 and placed on the electrode to serve as a matrix for immobilization of primary antibody (Ab 1 ). In the presence of CT, it will bind to the electrode. Then secondary antibody (Ab 2 ) modified with polyaniline (PANI) and ABEI is incubated onto the electrode. With the increase in the concentration of CT, the blue ECL of g-C 3 N 4 is quenched by PANI, while the blue luminescence of ABEI is enhanced. This enables ratiometric detection of calcitonin by ratioing the internsities at 460 and 475 nm. Response is linear in the 0.1~40 pg·mL −1 CT concentration range, and the limit of detection is 23 fg·mL −1 . The method breaks the limitation of common ECL ratiometric strategy, namely, two luminophores often share the common coreactant.
Schematic representation of an immunoassay where polyaniline (PANI) in a BSA-Ab 2 -ABEI-Au@PANI composite quenches the cathodic signal of a graphitic carbon nitride (Au-g-C 3 N 4 ) modified with gold nanoparticles (Au), while N-(aminobutyl)-N-(ethylisolumino) (ABEI) in the BSA-Ab 2 -ABEI-Au@PANI composit produces an anodic signal that enables quantitation of calcitonin.
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Journal of Materials Chemistry A
·
2018
·Vol. 6
·期 45
·22580-22589
·
IF 9.931
Xiu-Qing Qiao,Zhen-Wei Zhang,Qiu-Hao Li,Dongfang Hou,Qichun Zhang,Jian Zhang,Dong-Sheng Li,Pingyun Feng,Xianhui Bu
Exploiting novel photocatalysts with high efficiency and durability for reduction of hexavalent chromium (Cr(VI)) has gained attention from fundamental science and industrial research. In this work, we synthesized novel two-dimensional (2D) n–n Bi2MoO6 & Bi2S3 heterojunctions by a facile in situ anion exchange process for remarkably efficient removal of Cr(VI). Results show that Bi2MoO6 & Bi2S3 heterojunctions with core–shell structures are formed through the intimate contact of Bi2MoO6 core and Bi2S3 shell. The prepared Bi2MoO6 & Bi2S3 heterojunctions exhibit unprecedented photocatalytic activity for reduction of Cr(VI) under visible light irradiation. The optimized BMO-S1 heterojunction displays the highest reduction efficiency (κapp = 0.164 min−1) for Cr(VI) reduction. To the best of our knowledge, it is one of the highest reduction rate achieved among reported photocatalysts for Cr(VI) reduction under visible-light irradiation. Detailed studies show that strong selective adsorption for Cr(VI) enhances this unprecedented photocatalytic activity. Moreover, the intimate heterojunction between Bi2MoO6 core and Bi2S3 shell can efficiently deteriorate the charge carrier recombination and Bi2S3 content can boost visible light harvesting, thereby contributing to the remarkable photocatalytic catalytic activity, which were proven by PL, EIS and transient photocurrent responses. Characterization of Mott–Schottky plots and DRS prove that the Bi2MoO6 & Bi2S3 heterojunctions established a type-II band alignment with intimate contact, accounting for the efficient transfer and separation of photogenerated carriers. This work provides a simple route for facial synthesis of heterojunction photocatalysts for Cr(VI) reduction in industrial applications.
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JOURNAL OF APPLIED POLYMER SCIENCE
·
2014
·Vol. 131
·期 17
·
IF 1.64
Hongming Yuan,Zaochuan Ge,Shaojun Chen,Shiguo Chen,Haipeng Yang,Haitao Zhuo
This article demonstrates a comparative investigation about the effect of diisocyanate on pyridine containing shape memory polyurethanes (Py-SMPUs), which are synthesized with N , N -bis(2-hydroxylethyl)isonicotinamide (BINA) and four different diisocyanates: 1,6-hexanediisocyante (HDI), isophorone diisocyanate (IPDI), methylene diphenyl diisocyanate (MDI), and tolylene diisocyanate (TDI). Results show that all BINA–SMPU systems have amorphous reversible phase. Comparatively, the MDI–BINA and TDI–BINA systems show higher T g ; and the HDI–BINA and IPDI–BINA systems show better thermal stability. In addition, the HDI–BINA and the IPDI–BINA systems exhibit good thermal-induced shape memory effect and good moisture-sensitive shape memory effect due to their better moisture absorption properties. Particularly, the HDI–BINA system has better response speed and better shape recovery. © 2014 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2014 , 131 , 40721.
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EUROPEAN POLYMER JOURNAL
·
2013
·
IF 2.562
Xiaohong Wang,Guohua Jiang,Zhen Wei,Xia Li,Bolin Tang
The CO 2 stimulus-sensitive nanoparticles based on poly( N , N -dimethylaminoethyl methacrylate)- b -poly styrene (PDMAEMA- b -PS) were prepared via surfactant-free miniemulsion reversible addition–fragmentation chain transfer (RAFT) polymerization. The as-prepared nanoparticles exhibited core–shell structure with about 120 nm in diameter. Their dispersion/aggregation in water can be adjusted by alternatively bubbling of CO 2 and N 2 . Drug release from these nanoparticles can be accelerated (or delayed) by bubbling (or removing) of CO 2 .
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Polymer Chemistry
·
2013
·Vol. 4
·期 14
·3963-3967
·
IF 5.231
Guoyan Zhang,Jibin Zhang,Bai Yang
Polymerizable ZnS nanoparticles (NPs) were fabricated in N,N′-dimethylacrylamide via a novel facile and effective strategy, and a series of transparent bulk nanocomposites were also prepared based on such polymerizable ZnS NPs. The structure, surface chemistry and distribution of the polymerizable ZnS NPs were studied by powder XRD, FTIR, 1H NMR and TEM. The results indicated that we have successfully synthesized the polymerizable ZnS NPs with an average size of 4–5 nm by the innovatory method and the surface of these NPs were terminated with phenyl and vinyl groups which made sure of the good dispersion in the monomers. The polymerizable ZnS NPs could be easily polymerized with the monomers and fabricated a series of bulk nanocomposites. The obtained bulk nanocomposites (3 mm) exhibit good transmittance in the visible range and its refractive index are in the range from 1.527 to 1.598 in 632.8 nm by changing the content of the polymerizable ZnS NPs from 0 to 11.1 wt%. This novel strategy opens a new gate to produce transparent bulk nanocomposites with tunable refractive indices for potential optical device applications.
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