Energy Technology
·
2017
·Vol. 6
·期 7
·1342-1351
·
IF 2.789
Ying Zhang,Ronglan Zhang,Fei Yang,Jianshe Zhao
Four kinds of binuclear metal phthalocyanines (MPcs) complexes M 2 (PcTN) 2 Nap and M 2 (PcTA) 2 Nap (M=Ni II , Zn II ) are synthesized and used in Li/SOCl 2 battery as electrocatalysts to enhance capacity and discharge voltage. Density functional theory (DFT) calculations are carried out to investigate the improvement in electrochemical performance by carefully observing the shape of the frontier molecular orbitals (MOs). It is confirmed that a close relationship exists between MOs and catalytic performance of MPcs. The variation in reduction potentials of electrolyte SOCl 2 are also related to the MOs. Based on cyclic voltammetry measurements and the energy gap of MOs, a reaction mechanism that involves an irreversible two-step electron transfer process can be deduced, and a better strategy for the selection of catalysts is obtained.
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INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2018
·
IF 3.141
Yongwei Chen,Houxiao Wu,Daofei Lv,Renfeng Shi,Yang Chen,Qibin Xia,Zhong Li
In the petrochemical industry, ethane/ethylene (C2H6/C2H4) separation is one of the most important processes. Herein, we reported an iron-based metal–organic framework MIL-142A for efficiently trapping C2H6 from C2H6/C2H4 mixture, exhibiting preferential adsorption of C2H6 over C2H4. After various characterization techniques to confirm the successful preparation of MIL-142A, the C2H6 and C2H4 adsorptive separation performance was systematically investigated. Results showed that MIL-142A had remarkably higher C2H6 adsorption capacities than that of C2H4 at 298, 288, and 278 K, such as C2H6 and C2H4 adsorption capacities of 3.8 and 2.9 mmol/g at 298 K and 100 kPa, respectively. In addition, the C2H6 and C2H4 adsorption heats were relatively low and in the corresponding ranges 27.3–25.1 and 26.2–23.8 kJ/mol, which is a favorable property for the regeneration of MIL-142A with less energy penalty. Furthermore, it was inferred that the difference between the adsorption heat for C2H6 and C2H4 with the MIL-142A framework governed the selective adsorption of C2H6 over C2H4. The ideal adsorbed solution theory (IAST) selectivity of C2H6/C2H4 was high up to 5.8 in the initial low pressure and then decreased to 1.5 at 298 K and 100 kPa. Besides, breakthrough experiments also corroborated its efficient separation of C2H6/C2H4 mixture. Additionally, MIL-142A had excellent moisture stability, and its framework remained still intact after being exposed to humid conditions (80% RH) for 15 days. These comprehensive properties demonstrated that this unique material MIL-142A, as a high-performance C2H6-selective adsorbent, can be potentially used for highly adsorptive separation of the C2H6/C2H4 mixture.
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RSC Advances
·
2018
·Vol. 8
·期 18
·9762-9769
·
IF 2.936
Chen Li,Yun-shan Wei,Peng Wen,Kun Feng,Min-hua Zong,Hong Wu
A novel electrospun colon-specific delivery system for salmon calcitonin (SCT) was developed to improve its stability and bioavailability. Firstly, the pectin-coated SCT liposomes were prepared by film dispersion method and then a liposomes/sodium alginate/polyvinyl alcohol fiber mat was fabricated by electrospining. Scanning electron microscopy analysis indicated that the obtained nanofibers were uniform and smooth with an average diameter of about 350 nm. The release of SCT in different simulated digestive fluids was studied and corresponding release kinetics models were built. It was found that the fiber mat containing pectin-coated SCT liposomes had better stability and colon-specific properties compared with that containing uncoated SCT liposomes and the release of SCT in the colon followed the case II transport mechanism. In addition, there is no significant change in the bioactivity of released SCT measured by ELISA. This study shows that the electrospun colon-specific fiber mat is a potential delivery system for bioactive peptides.
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COMBUSTION AND FLAME
·
2018
·
IF 4.494
Xiaoyuan Zhang,Lili Ye,Yuyang Li,Yan Zhang,Chuangchuang Cao,Jiuzhong Yang,Zhongyue Zhou,Zhen Huang,Fei Qi
Acetaldehyde oxidation was investigated in a jet-stirred reactor at temperatures from 460 to 900 K, equivalence ratios from 0.5 to 4.0 and pressures of 710–720 Torr. Reactive intermediates under low-temperature conditions, such as methylperoxy, methylhydroperoxide and ketohydroperoxide were detected using synchrotron vacuum ultraviolet photoionization mass spectrometry (SVUV-PIMS). A kinetic model for acetaldehyde oxidation was constructed by incorporating recent theoretical and modeling progress of acetaldehyde kinetics, as well as the calculated results of H-atom abstraction reactions of acetaldehyde by acetylperoxy, methylperoxy and methoxy in this work. The present model was then comprehensively validated against the measurements in this work and the experimental data from literature. Modeling analysis reveals that the main chain-branching pathways of acetaldehyde under low-temperature oxidation conditions are the decomposition of acetylhydroperoxide and methylhydroperoxide. The second O 2 -addition process was verified to exist in the low-temperature oxidation of acetaldehyde as ketohydroperoxide was observed, while its contribution to the overall reactivity was found to be minor under present investigated conditions. On the other hand, the sub-mechanism of acetylperoxy is crucial in the low-temperature regime while the methyl oxidation mechanism dominates in the negative temperature coefficient (NTC) region at all equivalence ratios investigated in this work.
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NEW JOURNAL OF CHEMISTRY
·
2018
·Vol. 42
·期 6
·4324-4330
·
IF 3.201
Zhonghua Xue,Lulu Xiong,Hao Peng,Honghong Rao,Xiuhui Liu,Xiaoquan Lu
Rapid determination of cysteine in aqueous solution is important for the diagnosis and treatment of some diseases. We herein present a simple yet facile colorimetric indicator-displacement assay for cysteine in aqueous solution with a sensitive optical readout based on the competitive binding affinity between the 1-(2-pyridylazo)-2-naphthol (PAN) indicator and cysteine target towards the host Zn2+. In the absence of cysteine, Zn2+ can induce an appreciable yellow-to-pink color change for the PAN solution through the formation of a PAN–Zn2+ complex. However, adding cysteine to the above PAN–Zn2+ complex solution resulted in a ligand exchange reaction between PAN and cysteine with about 57 nm blue-shift in the absorbance maximum (from 527 nm to 470 nm), accompanied by a visible color change of the solution from pink to yellow. The obtained indicator-displacement assay provides a good detecting performance for cysteine with a detection limit of 7.32 μM (S/N = 3) using a UV/vis spectrometer as well as with a good linear range from 25 to 1000 μM. In particular, the proposed sensing system could be successfully used for the fabrication of a colorimetric INHIBIT logic gate and converted into the test paper and image capture analytical devices for the onsite visual determination of cysteine in practical applications.
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CHEMICAL RESEARCH IN CHINESE UNIVERSITIES
·
2018
·Vol. 34
·期 1
·95-100
·
IF 1.248
Fu Xianwei,Liu Yang,Liu Zhi,Dong Ning,Zhao Tianyu,Zhao Dan,Lian Gang,Wang Qilong,Cui Deliang
Although organic semiconductors have attracted extensive interest and been utilized to fabricate a variety of optoelectronic devices, their electrical transportation characteristics under high pressure have rarely been investigated. However, the weak intermolecular interaction of organic semiconductors endows them with a pressure-sensitive crystal structure and electrical transportation performance, especially the latter. Herein, a new pressure-sensitive transistor was fabricated from an organic semiconductor 1,1′-dibutyl-4,4′-bipyridinium diiodide. It was found that this transistor exhibited increasing resistance as the pressure gradually increased and that it eventually shut off under a pressure of 288 MPa. Such a characteristic makes this organic semiconductor a potential candidate for the use in the fabrication of pressure-sensitive switches and regulators. In addition, these results shed light on the electrical performance of flexible organic optoelectronic devices working under high pressure levels resulted from the bending force.
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JOURNAL OF THE BRAZILIAN CHEMICAL SOCIETY
·
2018
·Vol. 29
·期 1
·2-10
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IF 1.444
Wang Jian,Tian Lili,Yan Yanan,Liu Yaru,Zhang Yan,Yang Chun
An estradiol templated core-shell magnetic molecularly imprinted cryogel (MMIC) was synthesized to selectively extract and analyze estradiol in milk powder. The microsphere of Fe3O4@SiO2 was firstly prepared on Fe3O4 with ethyl silicate and 3-methyl propyl trimethoxy silane. Then the polymerization of α-methacrylic acid and ethylene glycol dimethyl acrylate was carried out on Fe3O4@SiO2 at −20 ºC for 24 h with estradiol as template. The morphology and microstructure of MMIC were investigated by transmission electron microscopy and infrared spectrogram. When used as chromatographic stationary phase, MMIC showed good selectivity and chromatographic performance for the template. Spiked milk powder samples were used to examine the adsorption capacity and selectivity of MMIC, giving recoveries of 92-101% and limit of detection 0.8-1.2 ng g−1. Experimental results indicate good reproducibility with relative standard deviation from 2.2 to 4.5% (n = 3) at spiked levels of estradiol 10, 50, and 100 ng g-1.
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Energy & Environmental Science
·
2018
·Vol. 11
·期 2
·407-416
·
IF 30.067
Yingfang Yao,Zhe Xu,Feng Cheng,Wenchao Li,Peixin Cui,Guangzhou Xu,Sheng Xu,Peng Wang,Guodong Sheng,Yadong Yan,Zhentao Yu,Shicheng Yan,Zhaoxu Chen,Zhigang Zou
Graphene-based electrocatalytic materials are potential low-cost electrocatalysts for the oxygen evolution reaction (OER). However, substantial overpotentials above thermodynamic requirements limit their efficiency and stability in OER-related energy conversion and storage technologies. Here, we embedded CrN crystals into graphene and in situ electrochemically oxidized them to construct graphene materials with encapsulated Cr6+ ions (Cr6+@G). These Cr6+@G materials exhibit the lowest OER overpotential of 197 mV at 10 mA cm−2 and excellent stability over 200 h at a high current density of about 120 mA cm−2 in an alkaline electrolyte. Spectroscopic and computational studies confirm a stable ion coordination environment significantly benefiting the downshift of the graphene Fermi level via hybridization of C p orbitals with d orbitals of Cr6+ ions that enhances the OER activity and stability.
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MOLECULES
·
2024
·Vol. 29
·期 20
·4862
·
IF 4.2
Li Song,Yan Liang,Yilin Li,Tingting Guo,Hui Li,Shuxuan Liang
With the advantages of a high specificity, a long half-life, and a high safety, the use of antibody biologic drugs, including camrelizumab, has been rapidly increasing in clinical practice. Camrelizumab, an immune checkpoint inhibitor and humanized monoclonal antibody, is used to treat several advanced solid cancers. Measuring its concentration supports personalized dosage adjustments, influences treatment decisions for patients, strengthens the control of disease activity through therapeutic drug monitoring, and helps evaluate and prevent drug interactions in combination therapy. Because antibodies are present in complex biological matrices, quantifying monoclonal antibody drugs is challenging, and must rely on precise, selective, and reliable analytical methods. In this study, a quadrupole time-of-flight mass spectrometry TripleTOF 6600+ (AB SCIEX, Framingham, MA, USA) system equipped with a Turbo V ion source was used for the qualitative analysis of monoclonal antibodies using the data-dependent acquisition (IDA) MS/MS mode, followed by quantitative analysis using a targeted MRMHR workflow. This method showed a good linear relationship within the range of 4–160 μg/mL, with a correlation coefficient of R2≥ 0.996. It demonstrated an acceptable accuracy (88.95–101.18%) and precision (≤15%). Furthermore, the lower limit of quantification was found to be 4 μg/mL, with the lowest detection limit of 0.3217 μg/mL, indicating that this method is rapid, accurate, and reliable for the quantitative analysis of camrelizumab in human serum.
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DESALINATION
·
2024
·
IF 8.3
Lin Yu,Aida Aibulatova,Zhen-Liang Xu,Li Li,Changqing Hao,Rui Jia,Yin-Xin Fang,Yan Zheng,Yong-Jian Tang
Covalent Organic Framework Materials (COFs) nanofiltration (NF) membranes have extensive applications in the field of separation. In this work, high performance TpPa COFs NF membranes were prepared with catalyst pre-diffused strategy. The catalyst pre-diffused method can let catalyst attached to the membrane surface, which can promote the formation of intermediates first, and then form a complete COFs separator layer in 30 min. The optimized membrane possesses an excellent performance of CR permeability of 97.57 L⋅m −2 ⋅h −1 ⋅bar −1 with a rejection of 99.25 % for CR. The dye/salt separation selectivity α was up to 480.16 (EB-T/NaCl). This markedly decreases the reaction duration for membrane production and enhances preparation efficiency. Consequently, the catalyst pre-diffusion strategy offers an innovative approach for the fabrication of COFs nanofiltration membranes.
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SEPARATION AND PURIFICATION TECHNOLOGY
·
2024
·
IF 8.1
Jiaxin Yang,Wenju Tao,Jiaming Li,Lingyu Kong,Shaohua Wu,Jingui He,Zhaoshun Liu,Yu Sun,Chao Fan,Zhaowen Wang
Low-cost and environmentally friendly recycling methods can incorporate strategic elements from discarded lithium-containing aluminum electrolytes (LiAE), which is crucial for alleviating resource shortages and environmental footprint. This study aims to develop a method for the comprehensive utilization of LiAE through low-temperature leaching of calcification. Unlike traditional high-temperature acidification roasting/ transformation processes (320–850 °C), the calcification leaching method only involves one-step leaching and avoids high heat energy consumption. Besides, this low-temperature calcification method chemically destroys the crystal structure of metal fluorides (Li, Na, K, etc.), ensuring a high leaching rate while ensuring an alkaline environment for lithium extraction from the leaching solution without additional alkaline neutralization. The lithium extraction rate exceeds 96 %, with high-purity Li 2 CO 3 and NaOH prepared. The CaCO 3 produced by decalcification has the potential for recycling (in the form of CaO after calcination). Meanwhile, the effects of operating temperature, mass ratio of CaO to LiAE, liquid–solid ratio, and leaching time on the calcium leaching reaction were systematically studied. The economic benefits and creative evaluation of the process were evaluated. Finally, the regenerated LCO prepared from recycled Li 2 CO 3 has been proven to have good electrochemical performance compared to commercial LCO, demonstrating the feasibility of energy storage application. In summary, the comprehensive utilization of LiAE by the calcium leaching method has been proven to be feasible.
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BIOMACROMOLECULES
·
2024
·
IF 5.5
Shili Ai,Qinzong Gao,Gele Cheng,Pengfei Zhong,Peiyu Cheng,Yingying Ren,Hao Wang,Xu Zhu,Shanyue Guan,Xiaozhong Qu
Conventional embolists disreputably tend to recanalization arising from the low filling ratio due to their rigidity or instability. As a result, intelligent hydrogels with a tunable modulus may meaningfully improve the therapeutic efficacy. Herein, an injectable composite double-network (CDN) hydrogel with high shear responsibility was prepared as a liquid embolic agent by cross-linking poly(vinyl alcohol) (PVA) and carboxymethyl chitosan (CMC) via dynamic covalent bonding of borate ester and benzoic-imine. A two-dimensional nanosheet, i.e., layered double hydroxide (LDH), was incorporated into the network through physical interactions which led to serious reduction of yield stress for the injection of the hydrogel and the capacity for loading therapeutic agents like indocyanine green (ICG) and doxorubicin (DOX) for the functions of photothermal therapy (PTT) and chemotherapy. The CDN hydrogel could thus be transported through a thin catheter and further in situ strengthened under physiological conditions, like in blood, by secondarily cross-linking with phosphate ions for longer degradation duration and better mechanical property. These characteristics met the requirements of arterial interventional embolization, which was demonstrated by renal embolism operation on rabbits, and meanwhile favored the inhibition of subcutaneous tumor growth on an animal model. Therefore, this work makes a breakthrough in the case of largely reducing the embolism risks, thus affording a novel generation for interventional embolization.
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