CARBOHYDRATE POLYMERS
·
2019
·
IF 6.044
Shouping Xu,Hao Li,Huan Ding,Zhouxiang Fan,Pihui Pi,Jiang Cheng,Xiufang Wen
Smart hydrogels with dual network were presented since a new allylated chitosan was conceived. As a double network hydrogel, its first network consisted of poly( N -isopropylacrylamide) worked as the gel matrix, and its second network with Schiff base bond enabled itself function as a molecular switch through the formation and break of the bond. When only the intestinal fluid was used, the second network could provide efficient protection for the loaded drug, and the drug release mechanism conformed to the non-Fickian type diffusion. While pre-treated with simulated gastric fluid, the switch would be opened and the mechanism was the Fickian type, which increased the cumulative percentage of drug release by about 25% and the release time by about 300 min. Besides, the hydrogel was characterized by 1 H NMR, FT-IR and SEM. The effects of allylated chitosan, pH and crosslinker on the swelling ratio and morphology of hydrogel were also studied.
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PubMed
高影响因子
POLYMER BULLETIN
·
2019
·Vol. 77
·期 2
·963-974
·
IF 1.858
Yang Xu,Sun Zhaojie,Gao Jingru,Yang Chunhui,Tang Dongyan
Temperature-responsive films of poly( N -isopropylacrylamide) (PNIPAM) were facilely fabricated by one-step plasma-initiated polymerization and then functionalized by self-polymerization of dopamine on the surface. High retention of the monomer structure and temperature-responsive properties in PNIPAM films were confirmed. After plasma-initiated polymerization, PNIPAM films formed protrusions and ridges surfaces. Moreover, cross-linker of N , N ′-methylenebisacrylamide with different dosage was introduced into the systems to effectively modulate the roughness of PNIPAM films and to supply better adhesive surface. Furthermore, in cell culture, satisfactory survival rate of the attached Hela cells was obtained on PNIPAM films, and the cell viability was improved further on PNIPAM/PDA films. The results indicated that such films might be applicable in medical treatment and tissue engineering, due to their adjusted adhesion ability and less toxicity to cells.
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FOOD AND AGRICULTURAL IMMUNOLOGY
·
2019
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IF 2.398
Xiangren Meng,Dejun Ji,Wei Zhang,Lixia Fu,Hengpeng Wang,Peng Wu
The nitrofurans were recently banned from use in livestock production due to their potential carcinogenicity in humans. Therefore, the screening of foods from animal origins for nitrofurans became mandatory. A rapid, specific and sensitive method based on immunochromatographic strip test has been developed for the determination of 3.5-dinitro-N’-(5-nitrofurfurylidene) salicylic acid hydrazide (DNSH) residues in fish. Fish samples were prepared by ultrasonic bath extraction, centrifugation, filtration, drying and res-suspension. The antigen (DNSH-glutaraldehyde-ovalbumin) and a goat anti-mouse IgG antibody were drawn onto a nitrocellulose membrane as the test and control line, respectively. Under optimal conditions, the DNSH cut-off limits for the test strips were determined as 10 ng/mL in 0.01 M phosphate buffered saline and 25 ng/mL in fish samples, with results obtained within 5min. Our data suggests this immunochromatographic assay can be used for the sensitive, rapid, and specific on-site screening of DNSH in fish products.
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JOURNAL OF ALLOYS AND COMPOUNDS
·
2019
·
IF 4.175
Zhenglu Zhu,Kaikai Bai,Haibin Zuo,Enyu Ma,Zhiqiang Xu,Lincheng Liu
Rapid technological advancements and increasing demand for the efficient utilisation of global resources have promoted the design and development of sustainable anode materials to achieve batteries with high specific capacities and excellent rate capability for energy-storage devices. Herein, a high-performance MnO nitrogen-doped carbon anode material for lithium-ion battery based on coffee residues, potassium permanganate, and urea is presented. MnO and N are uniformly embedded inside the carbon material, connected by N–Mn bonds. The introduction of N not only hinders the aggregation of Mn nanoparticles generated during lithiation, but also enhances the electrochemical activity of carbon and improves the electrical conductivity for better reaction kinetics. These benefitting factors promote the high reversible specific capacity of 768 mA h g −1 at the current density of 0.3 A g −1 , as well as superior cyclic and stability performance. The demonstrated high-performance and low-cost anode material also provides a sustainable route for the high-value-added utilisation of waste biomass.
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RENEWABLE ENERGY
·
2019
·
IF 5.439
Shaokai Zhang,Xun Ke,Tong Zeng,Yonghao Ni,Xiaolin Luo,Hui-Chao Hu,Lihui Chen,Liulian Huang
An ammonia-assisted headspace gas chromatography (HS-GC) method was developed to determine the N-methyl morpholine (NMM) concentration in biomass fractionation processes. The use of ammonia gas increased the detection sensitivity of NMM, and minimized the interfering effect of other substances during the analysis. Results showed that, by adding 1.5 mL ammonium hydroxide (28–30%, w/w) and a 0.125 mmol of sodium hydroxide into a 4.0 g of sample solution containing 43.3% N-methylmorpholine N-oxide (NMMO), the gas-liquid equilibration of NMM was obtained within 30 min at 80 °C. The optimum sample size and the NMMO content in the sample solutions were 6.0 g and 43.3%, respectively. The present method was proved to be of high precision (RSD = 4.33%), sensitivity (LOQ = 71.9 mg/kg), and with recovery accuracy of 96.0–102%. The present method was rapid, accurate, which will be a powerful tool to optimize the reaction conditions in NMMO-based biomass pretreatment process for enhancing the cost effectivity.
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RSC Advances
·
2019
·Vol. 9
·期 21
·11676-11682
·
IF 3.049
Yong Wei,Jijiang Fu,Hao Song,Ben Zhang,Chaoran Pi,Lu Xia,Xuming Zhang,Biao Gao,Yang Zheng,Paul K. Chu
Efficient and stable non-precious metal based electrocatalysts are crucial to the hydrogen evolution reaction (HER) in renewable energy conversion. Herein, CoxP nanoparticles (NPs) are uniformly embedded in N-doped TiO2 nanotube arrays (CoxP/N-TiO2 NTAs) by low-temperature phosphorization of the precursor of metallic cobalt NPs embedded in N-doped TiO2 NTAs (Co/N-TiO2 NTAs) which were fabricated by phase separation of CoTiO3 NTAs in ammonia. Owing to the abundant exposed surface active sites of CoxP NPs, tight contact between the CoxP NPs and TiO2 NTAs, fast electron transfer in N-doped TiO2, and channels for effective diffusion of ions and H2 bubbles in the tubular structure, the CoxP/N-TiO2 NTAs have excellent electrocatalytic activity in HER exemplified by a low overpotential of 180 mV at 10 mA cm−2 and small Tafel slope of 51 mV dec−1 in 0.5 M H2SO4. The catalyst also shows long-term cycling stability and is a promising non-precious metal catalyst for HER.
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ChemSusChem
·
2019
·Vol. 13
·期 4
·741-748
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IF 7.804
Mengfei Qiao,Ying Wang,Xamxikamar Mamat,Anran Chen,Guoan Zou,Lei Li,Guangzhi Hu,Shusheng Zhang,Xun Hu,Damien Voiry
Graphical Hierarchical electrocatalyst : Co-supported, N-doped, 3D-ordered porous carbon (Co-NOPC) is obtained by carbonization of the ordered porous metal–organic framework ZIF-67 prepared by forced molding of a polystyrene sphere (PS) template. The hierarchical porosity of Co-NOPC results in significantly improved performance as an electrocatalyst for the oxygen reduction reaction (ORR) under both alkaline and acidic conditions compared with its counterpart prepared from conventional ZIF-67. Developing highly active nonprecious-metal catalysts for the oxygen reduction reaction (ORR) is of great significance for reducing the cost of fuel cells. 3D-ordered porous structures could substantially improve the performance of the catalysts because of their excellent mass-diffusion properties and high specific surface areas. Herein, ordered porous ZIF-67 was prepared by forced molding of a polystyrene template, and Co-supported, N-doped, 3D-ordered porous carbon (Co-NOPC) was obtained after further carbonization. Co-NOPC exhibited excellent performance for the ORR in an alkaline medium with a half-wave potential of 0.86 V vs. reversible hydrogen electrode (RHE), which is higher than that of the state-of-the-art Pt/C (0.85 V vs. RHE). Moreover, the substantially improved catalytic performance of Co-NOPC compared with Co-supported, N-doped carbon revealed the key role of its hierarchical porosity in boosting the ORR. Co-NOPC also exhibited a close-to-ideal four-electron transfer path, long-term durability, and resistance to methanol penetration, which make it promising for large-scale application.
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Nano-Micro Letters
·
2019
·Vol. 11
·期 1
·1-13
·
IF 9.043
Yang Chengdong,Zhou Mi,He Chao,Gao Yun,Li Shuang,Fan Xin,Lin Yi,Cheng Fei,Zhu Puxin,Cheng Chong
Abstract To overcome the ever-growing organic pollutions in the water system, abundant efforts have been dedicated to fabricating efficient Fenton-like carbon catalysts. However, the rational design of carbon catalysts with high intrinsic activity remains a long-term goal. Herein, we report a new N -molecule-assisted self-catalytic carbonization process in augmenting the intrinsic Fenton-like activity of metal–organic-framework-derived carbon hybrids. During carbonization, the N -molecules provide alkane/ammonia gases and the formed iron nanocrystals act as the in situ catalysts, which result in the elaborated formation of carbon nanotubes (in situ chemical vapor deposition from alkane/iron catalysts) and micro-/meso-porous structures (ammonia gas etching). The obtained catalysts exhibited with abundant Fe/Fe–N x /pyridinic-N active species, micro-/meso-porous structures, and conductive carbon nanotubes. Consequently, the catalysts exhibit high efficiency toward the degradation of different organic pollutions, such as bisphenol A, methylene blue, and tetracycline. This study not only creates a new pathway for achieving highly active Fenton-like carbon catalysts but also takes a step toward the customized production of advanced carbon hybrids for diverse energy and environmental applications.
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CELLULOSE
·
2019
·Vol. 27
·期 2
·825-838
·
IF 3.917
Liao Jing,Huang Huihua
In this study, a novel temperature/pH dual responsive hydrogel, based on Hericium erinaceus residue carboxymethyl chitin (HCMC) and poly ( N -isopropylacrylamide) (PNIPAm), was synthesized by sequential IPN technique. Series of IPN hydrogels were obtained by varying initial N -isopropylacrylamide (NIPAm) concentrations. The structure, morphology, thermal property, transparency, mechanical property, swelling kinetics, temperature/pH responses and 5-Fu release behavior of the prepared hydrogels were systematically investigated. The structure analysis results showed that the IPN hydrogels were successfully synthesized. The prepared hydrogels showed more compact network structure and enhanced mechanical property as NIPAm concentration increased, but reduced transparency, swelling degree and 5-Fu release ratio. More importantly, HCMC and PNIPAm ensured the pH and temperature responses, respectively. 5-Fu could be gradually released from the prepared hydrogels, which followed Fickian diffusion model. Therefore, the prepared hydrogels may be served as promising materials for drug delivery systems.
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CHEMICAL ENGINEERING JOURNAL
·
2019
·
IF 8.355
Xiaoya Huang,Yan Zhang,Jing Bai,Jinhua Li,Linsen Li,Tingsheng Zhou,Shuai Chen,Jiachen Wang,Mohammadi Rahim,Xiaohong Guan,Baoxue Zhou
N-containing organic wastewater is harmful to human health and ecosystem while its degradation remains a huge challenge for decarburization and denitrification simultaneously. In this paper, we proposed a new photoelectrochemical method of chlorine oxide radicals production to oxidize mixture wastewater of phenol and N-ammonia into N 2 and CO 2 . The chlorine oxide radicals were generated via a rapid reaction of HClO with hydroxyl radicals or chlorine free radicals on a synergistic dual anode, in which hydroxyl radicals and chlorine free radicals generated on WO 3 side, and HClO generated on Sb-SnO 2 side, respectively. Phenol degradation rate on WO 3 -Sb/SnO 2 was 2.54 and 4.79 times than that on WO 3 and Sb/SnO 2 . Meanwhile, N-ammonia removal rate on WO 3 -Sb/SnO 2 was 5.69 and 20 times greater than that on WO 3 and Sb/SnO 2 , respectively. The effects of potential, Cl − concentration and initial pH were examined and the optimal conditions were potential 2.0 V vs Ag/AgCl, 0.05 M NaCl, pH = 5. The free radical quenching experiments and electron-spin resonance (ESR) confirmed that chlorine oxide radicals played an important role in the degradation of N-ammonia and phenol. Reasonable pathways of phenol in the WO 3 -Sb/SnO 2 system were also proposed. This work provides an exhaustive, novel, environmental-friendly photoelectrochemical system for N-containing organic wastewater treatment.
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ORGANIC PROCESS RESEARCH & DEVELOPMENT
·
2019
·
IF 3.327
Cuiling Wang,Xiao Bai,Rui Wang,Xudong Zheng,Xiumei Ma,Huan Chen,Yun Ai,Yajun Bai,Yifeng Liu
A new method for imatinib synthesis is described by using the C–N coupling reaction of 4-(4-methylpiperazine-1-methyl)benzamide with N-(5-bromo-2-tolyl)-4-(3-pyridyl)pyrimidin-2-amine to form imatinib. In this synthetic route, the high efficiency and high selectivity of nano-ZnO as a catalyst is key to the mild hydrolysis of 4-(4-methylpiperazine-1-methyl)benzonitrile into the corresponding amide. The total imatinib yield was 51.3%, and the purity was 99.9%. This simple and effective synthetic pathway avoids gene-impurity production (as classified by the FDA Center for Drug Evaluation and Research), and the synthesis is environmentally friendly with a short reaction time.
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ENERGY
·
2018
·
IF 4.968
Zhishan Zhang,Guruprasad Alva,Min Gu,Guiyin Fang
In this work, polystyrene–based form–stable composite phase change materials (CPCMs) were fabricated by a solution and reflux method. In the composites, the n–octadecane (ODE) was used as thermal energy storage material, the polystyrene (PS) acted as the supporting material, and expanded graphite (EG) was employed as thermal conductive filler to improve the thermal conductivity of the composites. The toluene was adopted as solvent. Both polystyrene and n–octadecane smoothly dissolve in toluene. EG was also easily dispersed into the matrix. CPCMs were obtained after distillation of the toluene. The differential scanning calorimeter (DSC) and a thermogravimetry analyzer (TGA) were adopted to assess the thermal properties and thermal stability of the CPCMs, respectively. Fourier transformation infrared (FT–IR) spectroscope and scanning electronic microscope (SEM) were utilized to determine the chemical structure and microstructure of the ODE/PS/EG composites. The thermal conductivity of the CPCM with 5 wt% content of EG can reach up to 1.01 W/m·K, which is nearly 7 times higher than that of the CPCM without the EG. The latent heat value of CPCM with the highest ODE content (48.5 wt%) is 98.05 J/g, the melting temperature is 27.5 °C, which is close to room temperature. Therefore, the form–stable CPCMs are promising thermal energy storage materials in solar thermal energy storage systems , such as solar heating system in buildings.
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