CELLULOSE
·
2021
·Vol. 28
·期 4
·2433-2443
·
IF 5.044
Zhou Yihang,Wang Kai,Hu Dongbo
A previous study on consolidation of waterlogged archaeological wood (WAW) via surface initiated ARGET ATRP of the cell walls has shown its potential of maintaining the dimensional stability. But the defects lie in the unsuitable initiator immobilization methods and polymerization conditions, which impedes its application. Therefore, we are proposing a novel functionalization method for initiator immobilization in water or water/ethanol solution and an improved thermo-initiated ARGET ATRP system. First, mercaptoethylamine (MEA) was used to functionalize WAW with amino groups in water under circumneutral conditions. Then, quinone-based initiators reacted with those amino groups realizing its immobilization. Finally, by using less active reductants such as ascorbic acid 2-glucoside and glucose, monomer, catalyst, and reductant were able to permeate into the WAW samples at room temperature and polymerization was initiated by heating to 60 °C (for ascorbic acid 2-glucoside) or 80 °C (for glucose). Both satisfying uniformity and dimensional stability (77.0–85.1% ASE) can be achieved through the described approach. Moreover, the described functionalization methods may also provide reference for WAW consolidation material designs and applications in other lignocellulosic materials in the future.
✓ 已验证
产品关联
DOI
高影响因子
Nano Research
·
2020
·Vol. 14
·期 4
·1218-1227
·
IF 8.183
Huang Pengfei,Zhang Shunlong,Ying Hangjun,Yang Wentao,Wang Jianli,Guo Rongnan,Han Weiqiang
Pillaring technologies have been considered as an effective way to improve lithium storage performance of Ti 3 C 2 T x MXene. Nevertheless, the pillared hybrids suffer from sluggish Li + diffusion kinetics and electronic transportation due to the compact multi-layered MXene structure, thus exhibiting inferior rate performance. Herein, the few-layered Ti 3 C 2 MXene (f-Ti 3 C 2 MXene) which is free from restacking can be prepared quickly based on the NH 4 + ions method. Besides, Fe nanocomplex pillared few-layered Ti 3 C 2 T x (FPTC) heterostructures are fabricated via the intercalation of Fe ions into the interlayer of f-Ti 3 C 2 MXene. The f-Ti 3 C 2 MXene which is immune to restacking can provide a highly conductive substrate for the rapid transport of Li + ions and electrons and possess adequate electrolyte accessible area. Moreover, f-Ti 3 C 2 MXene can efficiently relieve the aggregation, prevent the pulverization and buffer the large volume change of Fe nanocomplex during lithiation/delithiation process, leading to enhanced charge transfer kinetics and excellent structural stability of FPTC composites. Consequently, the FPTC hybrids exhibit a high capacity of 535 mAh·g −1 after 150 cycles at 0.5 A·g −1 and an enhanced rate performance with 310 mAh·g −1 after 850 cycles at 5 A·g −1 . This strategy is facile, universal and can be extended to fabricate various few-layered MXene-derived hybrids with superior rate capability.
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF RADIOANALYTICAL AND NUCLEAR CHEMISTRY
·
2020
·Vol. 327
·期 1
·39-47
·
IF 1.137
Liu Peng,Yu Qiang,Zhang Xu,Chen Jiaqi,Xue Yun,Ma Fuqiu
Amidoxime (AO) based adsorbents have been proposed as low cost and efficient adsorbent for U(VI). Herein, we present a simple strategy for preparing AO modified artificial zeolite. The composition and morphology of the materials have been confirmed via XRD, FT-IR, TGA and SEM. The AO-artificial zeolite was synthesised as an efficient adsorbent for adsorbing U(VI). The critical factors affecting U(VI) adsorption from aqueous solution were exploited, such as pH, contact time, temperature and adsorbent dosage. This study reveals AO-artificial zeolite, along with a low-cost, environmentally friendly and facile synthesis, can be regarded as a promising material for uranium-containing wastewater treatment.
✓ 已验证
产品关联
DOI
高影响因子
Marine Life Science & Technology
·
2020
·Vol. 3
·期 1
·85-93
·
IF 0
Chen Rui,Huang Wen-Can,Wang Wei,Mao Xiangzhao
Chitin nanofibers have recently received increased attention and are considered to be a promising material for a wide range of applications because of their excellent characteristics. In this study, 2,2,6,6-tetramethylpiperidine-1-oxyl (TEMPO)-oxidized chitin nanofibers (CNFs) with various oxidation times were prepared and characterized. CNFs with different oxidation times were then utilized for enzyme immobilization, using chymotrypsin as a model enzyme. The effects of oxidation time on enzyme immobilization were explored. Results showed characteristics of chitin nanofibers can be controlled by adjusting oxidation time. CNFs treated with TEMPO for 360 min showed the lowest crystallinity (79.13 ± 1.43%), the shortest length (241.70 ± 74.61 nm), the largest width (12.67 ± 3.43 nm), and the highest transmittance (73.01% at 800 nm). The activity of immobilized enzymes and enzyme loading showed good correlation to the carboxylate content of CNFs. The enzyme efficiency based on CNFs and the content of carboxylate groups peaked at the oxidization time of 60 min. When the additional amount of chymotrypsins (CTs) was 500 or 2000 mg/g carrier, the highest loading amount of CTs was 307.17 ± 4.08 or 726.82 ± 12.05 mg/g carrier, respectively.
✓ 已验证
产品关联
DOI
PubMed
MICROCHIMICA ACTA
·
2020
·Vol. 187
·期 11
·1-13
·
IF 6.232
Wang Zelan,Meng Zhe,Zhao Mengxin,Men Xiuqin,Yang Jinhui,Li Jiguang
A novel magnetic hollow bimetallic zinc/cobalt-based zeolitic imidazolate framework (MHB-Zn/Co-ZIF-8) was prepared via a microwave-assisted chemical etching in methanol. The structure, morphology, and specific surface area were characterized by X-ray diffraction and FTIR spectroscopy, scanning and transmission electron microscopy, and N 2 adsorption. The hollow nanostructures with high internal specific surface area, abundant active sites, and reduced aggregation of nanoparticles endow the hollow zeolitic imidazolate framework (ZIF) nanoparticle with high chemical stability, desirable durability, and excellent adsorption abilities. The MHB-Zn/Co-ZIF-8 nanoparticle was used as an effective sorbent for magnetic solid-phase extraction (MSPE) of trace aflatoxins B 1 , B 2 , G 1 , and G 2 from fruit juice and fruit samples. The main parameters affecting the efficiency of MSPE procedures were investigated and optimized. The results show that, under optimized conditions, enrichment factors ranging from 67- to 355-fold are obtained for the target analytes. The method is linear in the range 1.0 to 100.0 ng mL −1 with correlation coefficients ( R 2 ) from 0.9960 to 0.9992. The limits of detection of four aflatoxins are in the range 0.18 to 1.50 ng mL −1 and the average recoveries range from 75.1 to 102.4%, with relative standard deviations (RSDs) less than 13.6%. This work presents the excellent extraction performance of aflatoxins B 1 , B 2 , G 1 , and G 2 on MHB-Zn/Co-ZIF-8. In addition, the applicability of the MSPE coupling with ultrahigh-performance liquid chromatography-ion trap tandem mass spectrometry (UHPLC-IT-MS n ) for trace analysis in complex matrices is shown.
Schematic presentation of magnetic hollow bimetallic zinc/cobalt zeolitic imidazolate framework as sorbent for efficiently enriching aflatoxins B 1 , B 2 , G 1 , and G 2 from fruit juice samples prior to ultrahigh-performance liquid chromatography-ion trap tandem mass spectrometry (UHPLC-IT-MS n ) determination.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Nature Communications
·
2020
·Vol. 11
·期 1
·1-16
·
IF 12.121
Xu Hongjiao,Zhao Qian,Song Nazi,Yan Zhibin,Lin Runfeng,Wu Shuohan,Jiang Lili,Hong Sihua,Xie Junqiu,Zhou Huihao,Wang Rui,Jiang Xianxing
Chronic nonalcoholic steatohepatitis (NASH) is a metabolic disorder that often leads to liver fibrosis, a condition with limited therapy options. Adiponectin is an adipocytokine that regulates glucose and lipid metabolism via binding to its receptors AdipoR1 and AdipoR2, and AdipoRs signaling is reported to enhance fatty acid oxidation and glucose uptake. Here, we synthesize and report an adiponectin-based agonist JT003, which potently improves insulin resistance in high fat diet induced NASH mice and suppresses hepatic stellate cells (HSCs) activation in CCl 4 induced liver fibrosis. Mechanistic studies indicate that JT003 simultaneously stimulates AdipoR1- and AdipoR2- mediated signaling pathways as well as the PI3K-Akt pathway. Moreover, JT003 treatment significantly improves ER-mitochondrial axis function, which contributes to the reduced HSCs activation. Thus, the AdipoR1/AdipoR2 dual agonist improves both NASH and fibrosis in mice models, which provides the pharmacological and biological foundation for developing AdipoRs-based therapeutic agents on liver fibrosis.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Nature Communications
·
2020
·Vol. 11
·期 1
·1-11
·
IF 12.121
Hao Shaoyun,Liu Min,Pan Junjie,Liu Xiangnan,Tan Xiaoli,Xu Nan,He Yi,Lei Lecheng,Zhang Xingwang
Designing highly durable and active electrocatalysts applied in polymer electrolyte membrane (PEM) electrolyzer for the oxygen evolution reaction remains a grand challenge due to the high dissolution of catalysts in acidic electrolyte. Hindering formation of oxygen vacancies by tuning the electronic structure of catalysts to improve the durability and activity in acidic electrolyte was theoretically effective but rarely reported. Herein we demonstrated rationally tuning electronic structure of RuO 2 with introducing W and Er, which significantly increased oxygen vacancy formation energy. The representative W 0.2 Er 0.1 Ru 0.7 O 2-δ required a super-low overpotential of 168 mV (10 mA cm − 2 ) accompanied with a record stability of 500 h in acidic electrolyte. More remarkably, it could operate steadily for 120 h (100 mA cm − 2 ) in PEM device. Density functional theory calculations revealed co-doping of W and Er tuned electronic structure of RuO 2 by charge redistribution, which significantly prohibited formation of soluble Ru x>4 and lowered adsorption energies for oxygen intermediates.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF NANOPARTICLE RESEARCH
·
2020
·Vol. 22
·期 11
·1-13
·
IF 2.132
Wang Jing,Ma Dong-Mei,Feng Ying-Xin,Xian Yu,Qian Dong-Jin
Artificial pigments of metalloporphyrin derivatives are effective catalysts for the degradation of toxic organic dyes, phenols, and other pollutants. We reported here an interfacial layer-by-layer (LBL) assembly of multiporphyrin arrays on the surface of multi-walled carbon nanotubes (MWNTs) with the use of Na 2 PdCl 4 as a connector and manganese (III) meso-tetra(4-pyridyl)porphine acetate (MnTPyP) as a linker, respectively. Thermogravimetric analysis revealed that the relative content of organic species in the MWNT@(Pd-MnTPyP) n nanocomposites increased gradually with more layers of Pd-MnTPyP assembled. The Soret absorption band of MnTPyP displayed approximately 20-nm redshift in the nanocomposites due to the increase of porphyrin-porphyrin interaction within the Pd-MnTPyP ultrathin films. The specific surface area was about 513.1 and 47.7 m 2 /g for the original MWNTs and MWNT@(Pd-MnTPyP) 3 nanocomposites, respectively. Finally, the nanocomposites were used as heterogeneous catalysts for catalytic degradation of toxic 1-naphthol, 1,5-dihydroxynaphthalene, 5-amino-1-naphthol, and 1-naphthol-5-sulphonic acid in phosphate buffer, using H 2 O 2 as the oxidant. It was revealed that, when the nanocomposites were used, the catalytic efficiency could increase by 2 to 3 orders of magnitude. Higher catalytic efficiency was observed for the naphthols bearing the electron-donating group of hydroxyl or amino than those bearing an electron-withdrawing group of sulfonic acid.
Graphical abstract
✓ 已验证
产品关联
DOI
高影响因子
Nature Communications
·
2020
·Vol. 11
·期 1
·1-8
·
IF 12.121
Chen Kejun,Liu Kang,An Pengda,Li Huangjingwei,Lin Yiyang,Hu Junhua,Jia Chuankun,Fu Junwei,Li Hongmei,Liu Hui,Lin Zhang,Li Wenzhang,Li Jiahang,Lu Ying-Rui,Chan Ting-Shan,Zhang Ning,Liu Min
Iron phthalocyanine (FePc) is a promising non-precious catalyst for the oxygen reduction reaction (ORR). Unfortunately, FePc with plane-symmetric FeN 4 site usually exhibits an unsatisfactory ORR activity due to its poor O 2 adsorption and activation. Here, we report an axial Fe–O coordination induced electronic localization strategy to improve its O 2 adsorption, activation and thus the ORR performance. Theoretical calculations indicate that the Fe–O coordination evokes the electronic localization among the axial direction of O–FeN 4 sites to enhance O 2 adsorption and activation. To realize this speculation, FePc is coordinated with an oxidized carbon. Synchrotron X-ray absorption and Mössbauer spectra validate Fe–O coordination between FePc and carbon. The obtained catalyst exhibits fast kinetics for O 2 adsorption and activation with an ultralow Tafel slope of 27.5 mV dec −1 and a remarkable half-wave potential of 0.90 V. This work offers a new strategy to regulate catalytic sites for better performance.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Nano Research
·
2020
·Vol. 13
·期 11
·3048-3056
·
IF 8.183
Li Wei,Li Xiaofeng,Chang Wei,Wu Jing,Liu Pengfei,Wang Jianjun,Yao Xi,Yu Zhong-Zhen
Effective utilization of abundant solar energy for desalination of seawater and purification of wastewater is one of sustainable techniques for production of clean water, helping relieve global water resource shortage. Herein, we fabricate a vertically aligned reduced graphene oxide/Ti 3 C 2 T x MXene (A-RGO/MX) hybrid hydrogel with aligned channels as an independent solar steam generation device for highly efficient solar steam generation. The vertically aligned channels, generated by a liquid nitrogen-assisted directional-freezing process, not only rapidly transport water upward to the evaporation surface for efficient solar steam generation, but also facilitate multiple reflections of solar light inside the channels for efficient solar light absorption. The deliberate slight reduction endows the RGO with plenty of polar groups, decreasing the water vaporization enthalpy effectively and hence accelerating water evaporation efficiently. The MXene sheets, infiltrated inside the A-RGO hydrogel on the basis of Marangoni effect, enhance light absorption capacity and photothermal conversion performance. As a result, the A-RGO/MX hybrid hydrogel achieves a water evaporation rate of 2.09 kg·m −2 ·h −1 with a high conversion efficiency of 93.5% under 1-sun irradiation. Additionally, this photothermal conversion hydrogel rapidly desalinates seawater and purifies wastewater to generate clean water with outstanding ion rejection rates of above 99% for most ions.
✓ 已验证
产品关联
DOI
高影响因子
RARE METALS
·
2020
·Vol. 40
·期 7
·1987-1994
·
IF 2.161
Wang Ya-Ting,Liu Men,Tang Nian,Li Sheng-Jian,Sun Yan,Wang Shi-Xiong,Yang Xiang-Jun
Abstract Solvent extraction based on ionic liquids is generally considered to be an environmentally benign and effective technology for gold(I) recovery. The aim of this work is to study gold(I) extraction from aurocyanide solution using fluorine-free ionic liquids [A336][SCN], [A336][MTBA] and [A336][Mal]. Various factors that affect gold(I) extraction (including concentration of ionic liquids, equilibrium pH, concentration of the modifier tributyl phosphate (TBP), reaction time and initial concentration of gold in an aqueous solution) were studied and optimized. The results indicate that the three Aliquat 336-based ionic liquids all exhibit excellent behaviors for gold(I) extraction. More than 99.8% of gold(I) can be extracted from the aqueous phase into the ionic liquid phase. The gold-loaded ionic liquids were characterized using infrared spectroscopy and mass spectrometry to study the extraction mechanism of gold(I). The results revealed that extraction of gold(I) into the ionic liquid phase was based on an exchange reaction between the anion Au(CN)
− 2
in aqueous solution and the anion SCN − in ionic liquid [A336][SCN]. The logarithmic relationship between distribution coefficient and TBP concentration indicates that two TBP molecules are involved in the formation of the extracted complex. The extracted complex was determined to be A336 + ·Au(CN)
− 2
·2TBP. In addition, the gold(I)-loaded ionic liquids can be efficiently stripped using NH 4 SCN, 2-methylthiobenzoic acid and methyl maltol. The results establish that Aliquat 336-based ionic liquids have potential application prospects in gold(I) recovery from cyanide solutions.
✓ 已验证
产品关联
DOI
高影响因子
Drug Delivery and Translational Research
·
2020
·Vol. 11
·期 3
·1133-1143
·
IF 2.664
Li Ruirui,Shan Linwei,Yao Yanan,Peng Feifei,Jiang Shanshan,Yang Dandan,Ling Guixia,Zhang Peng
The platform of the combination chemo-photodynamic therapy has received widespread attention for enhancing anticancer efficacy and inhibiting tumor growth, which supports thermosensitive and controlled drug release. Here, an injectable thermoreversible hydrogel (BPNSs/DTX-M-hydrogel) co-encapsulating black phosphorus nanosheets (BPNSs) and docetaxel (DTX) micelles was prepared to increase drug accumulation in tumor tissue and improve anticancer efficacy. BPNSs were prepared by liquid exfoliation method with a simple and rapid preparation, and DTX micelles were prepared by the thin film dispersion method. Hydrogel was prepared with F127 as hydrogel matrix for intratumoral injection. BPNSs, DTX micelles, and BPNSs/DTX-M-hydrogel were characterized by particle size, morphology, stability and degradation, phase transition feature, and photodynamic performance. And the in vivo anticancer efficacy was evaluated in 4T1 tumor-bearing Balb/c mice. The results showed that the particle size of DTX micelles and BPNSs were about 16 and 180 nm, respectively. The hydrogel with the transformation temperature at near body exhibited great photodynamic efficacy and good biodegradability. Moreover, BPNSs/DTX-M-hydrogel with the combination of chemotherapy and photodynamic therapy exhibited unique anticancer efficacy with low toxicity. In conclusion, the combination platform of chemo-photodynamic therapy based on BPNSs could be a prospective strategy in antitumor research.
Graphical abstract
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）