Advanced Composites and Hybrid Materials
·
2021
·Vol. 4
·期 4
·1270-1280
·
IF 5.693
Xu Manman,Huang Yunqing,Chen Ruwei,Huang Quanbo,Yang Yang,Zhong Linxin,Ren Junli,Wang Xiaohui
There is an urgent need to find green and efficient technologies for the sustainable reuse of the Chinese medicine residues due to their abundant annual production companied with serious environment problems. Herein, we synthesized a three-dimensional hierarchically porous carbon from Ganoderma lucidum residues for the application of supercapacitor electrodes via a molten alkali treatment activation/carbonization process. The resulting porous carbon samples had large surface areas (1347.7 m 2 g −1 ), a hierarchical pore structure, and excellent capacitance and were obtained using much less corrosive activator compared with other studies. When used for supercapacitor, the Ganoderma lucidum residues–derived porous carbon electrode presented outstanding electrochemical performance, with specific capacitances of up to 365.6 F g −1 at 1 A g −1 , and cycling stability of up to 99% after 10,000 cycles at a current density of 2 A g −1 . This work broadens the application of Chinese medicine residues in the field of energy storage and provides a new avenue for high value conversion of waste resources. Graphical abstract
Using Chinese Medicine Residues as precursor, a convenient activation/carbonization process is proposed to synthesize porous carbon as supercapacitor electrode materials.
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CELLULOSE
·
2021
·Vol. 28
·期 11
·7465-7481
·
IF 5.044
Xiao Mengyuan,Guo Yingbin,Zhang Jiayue,Liu Yansong,Ren Yuanlin,Liu Xiaohui
Ammonium salt of diethylene triamine penta methylene phosphonic acid (ADTPMPA), a novel flame retardant, was synthesized and grafted on the lyocell fabric to obtain a kind of flame retardant lyocell fabric (FR-lyocell). Then FR-lyocell was coated by Ag nanoparticles (Ag NPs) to fabricate flame retardant and antibacterial lyocell fabric (FR-Ag-lyocell). The elemental composition, surface morphology, combustion behavior and antibacterial activity of the lyocell fabric before and after modification were investigated. The flame retardant and antibacterial mechanism of FR-Ag-lyocell fabric was also analyzed. The limiting oxygen index (LOI) values of FR-Ag-lyocell fabric before and after 20 laundering cycles (LCs) reached 44.8% and 31.3%, respectively. The treated lyocell fabric possessed lower peak of heat release rate (pHRR) and total heat release (THR) values compared with control lyocell fabric. The FR-Ag-lyocell fabric exhibited excellent antimicrobial ability against Staphylococcus aureus ( S. aureus ) and Escherichia coli ( E. coli ), even after 10 LCs. These results indicated that FR-Ag-lyocell fabric had durable flame retardant and antibacterial properties. Graphic abstract
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JOURNAL OF NANOPARTICLE RESEARCH
·
2021
·Vol. 23
·期 6
·1-11
·
IF 2.253
Lv Fangfang,Jin Yan,Feng Xiaochen,Fan Miao,Ren Cui,Dai Xinyue,Zhang Jinchao,Li Zhenhua,Jin Yi,Liu Huifang
Tumor vaccine has shown outstanding advantages and good therapeutic effects in tumor immunotherapy. However, antigens in tumor vaccines can be easily cleared by the reticuloendothelium system in advance, which leads to poor therapeutic effect of tumor vaccines. Moreover, it was still hard to monitor the fate and distribution of antigens. To address these limitations, we synthesized a traceable nanovaccine based on gold nanocluster-labeled antigens and upconversion nanoparticles (UCNPs) for the treatment of melanoma in this study. PH-sensitive Schiff base bond is introduced between UCNPs and gold nanocluster-labeled ovalbumin antigens for monitoring antigens release. Our studies demonstrated that UCNPs conjugated metallic antigen showed excellent biocompatibility, pH-sensitive and therapeutic effect.
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PubMed
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MICROCHIMICA ACTA
·
2021
·Vol. 188
·期 10
·1-9
·
IF 5.833
Jia Jing,Lu Wenjing,Cui Sai,Dong Chuan,Shuang Shaomin
N, Cl-doped carbon dots (N, Cl-CDs) were prepared by hydrothermal method from rhodamine B (RhB) and ethylenediamine (EDA). The resulting N, Cl-CDs exhibited fascinating solvent dependence and strict excitation independence. As the polarity of the solvent increased (from tetrahydrofuran (THF) to water), the emission spectrum of N, Cl-CDs was redshifted and the fluorescence efficiency decreased, which were attributed to hydrogen bond-induced aggregation. Taking advantage of these attributes, the N, Cl-CDs were used as suitable probes for fluorescence and colorimetric dual-mode detection of water in THF. The linear relationship was 0.5–100% water with the detection limit down to 0.093%. Moreover, the sensing platform was converted into a paper-based sensor for handy, real-time, and visible humidity sensing. N, Cl-CDs/PVA films were fabricated and realized continuously tunable solid-state fluorescence, further expanding their practical application. Graphical abstract
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CHINESE JOURNAL OF POLYMER SCIENCE
·
2021
·Vol. 39
·期 12
·1634-1644
·
IF 3.603
Yuan Meng-Jie,Hu Zhao-Yu,Fang Hong,Li Shu-Jing,Guo Hong-Tao,Hu Ru-Bei,Jiang Shao-Hua,Liu Kun-Ming,Hou Hao-Qing
Polynaphthalimide (PNI) with six-membered imide ring ( 6 -PI) has better chemical resistance than five-membered imide ring ( 5 -PI), but is difficult to be processed into nanofibers due to the poor processability. In this work, we proposed a template strategy to fabricate nanofiber 6 -PI membranes and their composite membranes. Neat 6 -PI and 6 -PI composite fibrous membranes were prepared using high-molecular-weight polymers 5 -PAA and PVP as templates by electrospinning. FTIR, DMA, TGA and tensile tests were used to characterize their chemical structures, thermal stability and mechanical properties. Further eye-observation, micro-morphology investigation and tensile tests were applied to evaluate the chemical resistance of nanofibrous membranes in strong acid, strong alkaline, and concentrated salt. The results demonstrated that 6 -PI nanofibrous membranes possessed the best thermal stability, best acid, alkaline, and salt resistance with the highest mechanical retention. This study will provide basic information for high-performance electrospun 6 -PI nanofiber membranes and provide opportunities for applications of PIs in different chemically harsh environments.
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CATALYSIS LETTERS
·
2021
·Vol. 152
·期 6
·1844-1853
·
IF 3.186
Li Zihan,Yang Lingbin,Zhu Lijun,Xia Daohong
Novel B-doped NiP/Hβ (Hβ is the hydrogen proton exchanged β molecular sieve) catalysts were prepared and the catalytic performance for n-C 6 (n-hexane) isomerization was studied firstly. It was found that the mole ratio of Ni, P and B in preparing B-doped NiP had important influence on the crystalline structure and catalytic activity of NiPB. When the mole ratio of Ni, P and B was 1:1:1, the prepared NiPB was amorphous and NiPB/Hβ had the best catalytic activity with the conversion rate of n-C 6 , the yield and selectivity of isoparaffins being 79.93%, 78.34% and 98.01% respectively. It was also showed that the preparation conditions of catalyst including NiPB loading on carrier and calcination temperatures were the key factors for the catalytic performance of NiPB/Hβ. In controlled experiments, ammonia poisoned acid sites on the catalyst led to the markedly reducing of catalytic performance and metal sites were essentially for the dehydrogenation-hydrogenation reaction. The isomerization of n-C 6 catalyzed by NiPB/Hβ is a continuous alternating process of acid catalysis and metal catalysis, and the matching of acid sites and metal sites is of importance. Graphic Abstract
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JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
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2021
·Vol. 32
·期 18
·22910-22920
·
IF 2.478
Zhao Yuan,Zhang Mengqi,Wang Wei,Song Wenli,Jiang Kanrui,Zhang Xiaojuan
Ti 3+ /N-co-doped TiO 2 was successfully synthesized in situ by one-step hydrothermal method using tetrabutyl titanate (TBOT) as the titanium source and hydrazine hydrate as the reducing agent and nitrogen source. Afterward, the microstructure and physicochemical properties of the catalysts were characterized by transmission electron microscopy, X-ray diffraction, Raman spectroscopy, X-ray photoelectron spectroscopy, UV–vis diffuse reflectance spectroscopy, and photoluminescence spectroscopy. Results indicated that nitrogen was effectively doped into the lattice of TiO 2 and Ti 3+ was stably presented in the prepared TiO 2 , which reduced the band-gap TiO 2 (2.96–2.75 eV) and enhanced photo-induced charge separation efficiency under visible light. In addition, the photocatalytic activity was evaluated by degradation of rhodamine B under xenon lamp with 420 nm filter. With the amount of hydrazine hydrate increased, the photocatalytic degradation performance of the sample increased first and then decreased. When the volume ratio of hydrazine hydrate to TBOT was 1:5, the sample showed the best photocatalytic performance.
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FIBERS AND POLYMERS
·
2021
·Vol. 23
·期 1
·1-9
·
IF 2.153
Liu Shangpeng,Yu Yi,Jiang Shasha,Li Jiwei,Wang Shuang,Chen Shaojuan,Ma Jianwei
This study developed a partially water-soluble carboxymethyl chitosan (PWCS) fibers by ethanol-water exhaustion method. Sodium carboxylate was successfully introduced into chitosan fibers, as evidenced by FTIR, which enhanced natural chitosan water solubility. SEM-EDS revealed that the sodium carboxylate groups presented in a gradient distribution from the exterior to the interior of the PWCS fibers, which leads to a controllable swelling performance. Moreover, the PWCS fibers had excellent antibacterial ability against S. aureus and E. coli bacteria comparing with origin CS fibers. The cytotoxicity assay (CCK-8) and fluorescence staining confirmed that all developed samples showed non-toxicity towards MRC-5 and exhibited a surprising promoting effect on cell proliferation, corroborating their biocompatibility. Besides, due to its excellent controllable water selling ability and protonated amine groups, the PWCS fibers possessed an efficient hemostatic performance. In conclusion, PWCS fibers could become a promising material in hemostatic and wound healing applications.
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CHEMICAL PAPERS
·
2021
·Vol. 75
·期 12
·6477-6485
·
IF 2.097
Ren Xiaohui,Feng Xiaoxiang,Li Xuandong,Li Xin
A large number of pesticides left in the crops and water affect the environment and human health. The combination of surface-enhanced Raman scattering (SERS) technology and molecular imprinting technology (MIT) was presented to apply to the detection of target molecules in water. However, the thickness of the imprinted layer and the inhomogeneity of the shell package have a great influence on SERS detection. To overcome the above problems, a new method is proposed to control the imprinted layer within 5 nm by taking the large-scale Ag as the core, reducing the amount of reagent, increase the oscillation time of polymerization, and so on. The obtained Ag@molecular imprinted polymers (Ag@MIPs) were applied for rapid detection of carbendazim. Besides, the SERS intensity of Ag@MIPs for carbendazim was higher than that of Ag, exhibiting limit detection as low as 1 × 10 −9 M. Also, Ag@MIPs is used as SERS substrate achieved high selectively and satisfactory reusability. Based on the above, the experiment results proved that the Ag@MIPs with a thin imprinted layer provided a reliable approach for carbendazim detection.
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Journal of Central South University
·
2021
·Vol. 28
·期 6
·1652-1664
·
IF 1.716
Jiang Chun-lu,Wang Rui,Chen Xing,Zheng Liu-gen,Cheng Hua
Chitosan-coated fly ash (CWF) was prepared by the acid leaching-coating method. Chitosan and fly ash were crosslinked in the solution of acetic acid and sulfuric acid. The microstructure of CWF was conducted by scanning electron microscope (SEM) and X-ray diffraction (XRD). The removal of Cr(VI) from water by CWF was studied by adsorption experiments. The composite prepared by the experiment developed a pore structure and a crystal structure similar to SiO 2 and chitosan chain-like coating was formed on the surface of fly ash. The new modified material has larger surface roughness, specific surface area and more adsorption channels. The Cr(VI) was enriched in modified materials by electrostatic adsorption between CrO 4 2− , CrO 7 2− and —NH 3 + group and surface acid functional groups. The movement of Cr(VI) in solution is a diffusion process from the main body of the liquid phase to the surface of the liquid film.
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FIBERS AND POLYMERS
·
2021
·Vol. 22
·期 12
·3261-3270
·
IF 2.153
Liu Kainan,Cao Liqin
Nylon mesh has been applied in various fields because of its intrinsic mechanical and chemical stability. However, its application is limited by its surface property. In this work, nylon mesh was first designed to integrate with a zeolitic imidazolate framework-67 (ZIF-67) with a distinct hydrophobic property. Herein, the mechanically stable nylon mesh/carboxymethyl chitosan/ZIF-67 (NY/CMCS/ZIF-67) composite membranes were prepared via layer-by-layer self-assembly of CMCS surface functional groups to coordinate with cobalt ion and in situ growth of ZIF-67. The prepared NY/CMCS/ZIF-67 membranes were characterized by Fourier-transform infrared spectroscopy, X-ray diffraction, scanning electron microscopy, and thermogravimetric analysis. After modifications, the ZIF-67 content in the membranes reached 22 %. The water contact angle increased from 47.5 ° for nylon mesh to 128.8 ° for NY/CMCS/ZIF-67. The NY/CMCS/ZIF-67 composite membranes exhibited good oil-water emulsion separation property and oil absorption ability. After 15 oil absorption-drying cycle experiments, the oil absorption ability of the membrane was still greater than 95 %, and the oil absorption rate was 6.8 g/g. The modified nylon mesh could still be used for dye removal, the adsorption capacity of the membrane increased by 50 % compared with that of NY/CMCS, and the adsorption processes followed the pseudo-second-order model. Thus, this research provides new insights into the preparation of efficient modified nylon film with great application potential for filtration and separation in complex environments.
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Microbial Cell Factories
·
2021
·Vol. 20
·期 1
·1-13
·
IF 5.328
Zhang Yanfeng,He Yongzhi,Zhang Nan,Gan JiaJia,Zhang Shan,Dong Zhiyang
Background Melatonin has attracted substantial attention because of its excellent prospects for both medical applications and crop improvement. The microbial production of melatonin is a safer and more promising alternative to chemical synthesis approaches. Researchers have failed to produce high yields of melatonin in common heterologous hosts due to either the insolubility or low enzyme activity of proteins encoded by gene clusters related to melatonin biosynthesis. Results Here, a combinatorial gene pathway for melatonin production was successfully established in Escherichia coli by combining the physostigmine biosynthetic genes from Streptomyces albulus and gene encoding phenylalanine 4-hydroxylase (P4H) from Xanthomonas campestris and caffeic acid 3- O -methyltransferase (COMT) from Oryza sativa . A threefold improvement of melatonin production was achieved by balancing the expression of heterologous proteins and adding 3% glycerol. Further protein engineering and metabolic engineering were conducted to improve the conversion of N -acetylserotonin (NAS) to melatonin. Construction of COMT variant containing C303F and V321T mutations increased the production of melatonin by fivefold. Moreover, the deletion of speD gene increased the supply of S-adenosylmethionine (SAM), an indispensable cofactor of COMT, which doubled the yield of melatonin. In the final engineered strain EcMEL8, the production of NAS and melatonin reached 879.38 ± 71.42 mg/L and 136.17 ± 1.33 mg/L in a shake flask. Finally, in a 2-L bioreactor, EcMEL8 produced 1.06 ± 0.07 g/L NAS and 0.65 ± 0.11 g/L melatonin with tryptophan supplementation. Conclusions This study established a novel combinatorial pathway for melatonin biosynthesis in E. coli and provided alternative strategies for improvement of melatonin production.
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