Polymers
·
2021
·Vol. 13
·期 3
·365
·
IF 4.329
Yi Li,Guoyong Huang,Cong Chen,Xue-Wei Wei,Xi Dong,Wei Zhao,Hai-Mu Ye
Big spherulite structure and high crystallinity are the two main drawbacks of poly(butylene succinate) (PBS) and hinder its application. In this work, a new type of copolyester poly(butylene succinate-co-butylene acetylenedicarboxylate) (PBSAD) is synthesized. With the incorporation of acetylenedicarboxylate (AD) units into PBS chains, the crystallization temperature and crystallinity are depressed by excluding AD units to the amorphous region. In contrast, the primary nucleation capability is significantly strengthened, without changing the crystal modification or crystallization kinetics, leading to the recovery of total crystallization rate of PBSAD under the same supercooling condition. The existence of specific interaction among AD units is found to be crucial. Although it is too weak to contribute to the melt memory effect at elevated temperature, the interaction continuously strengthens as the temperature falls down, and the heterogeneous aggregation of AD units keeps growing. When the aggregating process reaches a certain extent, it will induce the formation of a significant amount of crystal nuclei. The unveiled nucleation mechanism helps to design PBS copolymer with good performance.
✓ 已验证
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2019
·
IF 5.107
Nengwen Gao,Wei Fan,Zhi-Kang Xu
Protein separation and purification is important in biotechnology and food processing industries. Ceramic membranes have shown great potentials for this task. But membrane fouling remains a barrier to their widespread application due to the irreversible adsorption of protein onto the membrane. In this work, one-step co-deposition of dopamine (DA) and diglycolamine (DGA) was conducted on the ceramic membranes for fabricating protein-resistant surfaces. CuSO 4 /H 2 O 2 was used as a trigger to shorten the deposition time and to improve the deposition efficiency. The effect of DA/DGA mass ratio on the membrane structures and properties was studied by FESEM, FTIR, XPS and contact angle measurements. The results indicate that the optimal DA/DGA mass ratio in the co-deposition solution is 1:4. The modified membranes show improved hydrophilicity and negatively charged property. In dynamic protein filtration, these ceramic membranes exhibit a higher permeate flux, a higher water flux recovery, and a lower water flux reduction compared to the original membrane. Moreover, the antifouling property of the modified membrane is preserved after the membranes are treated with high speed water scouring. As a result, this one-step co-deposition method is a simple and effective way to prepare durable fouling-resistant ceramic membranes for protein removal.
✓ 已验证
DOI
高影响因子
ChemCatChem
·
2021
·Vol. 13
·期 21
·4610-4617
·
IF 5.686
Yifei Yang,Linsen Zhou,Jun Chen,Ruizhi Qiu,Yunxi Yao
Graphical Highly dispersed Pt clusters supported on TiN substrates favor the formation of highly reactive dual sites. Molecular O 2 dissociatively adsorbs on the Ti−Ti bridge sites to form titanium oxynitride (TiN x O y ) skin and the oxygen atom binding on Ti sites readily react with the adjacent CO adsorbed on Pt to attain the catalytic cycle. The interfacial synergistic effect between Pt and TiN results in superior performance in the low-temperature CO oxidation. The metal-support interfacial synergistic catalysis allows the competitive reaction steps to occur in close proximity at different sites, thus decreasing the activation barrier and improving the catalytic efficiency. Combining the structural characterization, reactivity assessments and density functional theory (DFT) calculations, it is found that highly dispersed Pt clusters on TiN substrates favor the formation of Pt−TiN interfacial dual sites, which are highly reactive for the low-temperature CO oxidation with an apparent activation energy as low as 38.7 kJ mol −1 , much less than that on the traditional Pt/TiO 2 or Pt/SiO 2 catalysts. At low temperature, the surface sites of Pt are saturated with CO adsorption due to its high adsorption energy and the molecular O 2 dissociatively adsorbs on the Ti sites to form the titanium oxynitride (TiN x O y ) skin with a low barrier of 0.1 eV. The O atoms binding on Ti sites readily react with the adjacent CO molecules adsorbed on the perimeter of Pt clusters to attain a catalytic cycle with a reaction barrier of 0.5 eV. The interfacial synergistic effect between Pt and TiN is the origin of the low temperature CO oxidation activity on the metal-nitride catalysts.
✓ 已验证
DOI
高影响因子
MICROCHEMICAL JOURNAL
·
2022
·
IF 5.304
Jing Tang,Tao Hu,Nali Li,Yanli Zhu,Jie Li,Shengbiao Zheng,Jiahao Guo
Electrochemical determination of luteolin is vital to food industry owing to its bioactive properties such as anti-viral, anti-ulcer. However, bare electrode of traditional electrochemical sensors generally have narrow linear range and low sensitivity, which sets limit on their practical application. Accordingly, a new nano-architecture fabricated with Ag doped CoNi-bimetal metal–organic frameworks (Ag-CoNi-MOF) is developed as a material for electrochemical determination of luteolin. The introduction of Ag to three-dimensional (3D) flower-like hierarchical structure greatly increases specific surface area and electrical conductivity, which subsequently provides more excellent active sites for luteolin oxidation. Under optimal conditions, Ag-CoNi-MOF sensor presents a broader linear response to luteolin concentration of 0.002 – 1.0 μM with the detection limit as low as 0.4 nM (S/N = 3). Ag-CoNi-MOF has good anti-interference according to compared amperometric current response of luteolin within different organic analytes and metal ions. Finally, the sensor platform is implemented directly to determine luteolin in human urine for evaluation of its practical application. In general, Ag-CoNi-MOF sensors fabricated perform larger linear range with high sensitivity and anti-interference properties, which can be used as a potential material for electrochemical determination of luteolin.
✓ 已验证
DOI
高影响因子
APPLIED CATALYSIS A-GENERAL
·
2021
·
IF 5.706
Min Zhao,Yihui Li,Ziang Zhao,Yuan Lyu,Wei Lu,Hejun Zhu,Yunjie Ding
Mn-doped spinel oxides CoAl 2 O 4 marked as CMA-m (m = Co/Mn atom ratio) herein were synthesized and evaluated for the first time as supports of Co-based Fischer-Tropsch synthesis (FTS) catalysts. HAADF-STEM images showed that Mn doping caused more crystal defects on the surface of CMA-m grains, which may provide more attachment sites for cobalt loading, leading to much smaller Co 0 particle size of 15Co/CMA-m than that of 15Co/CoAl 2 O 4 . Data of H 2 /CO chemisorption showed that the interaction of highly dispersed Co 0 with lattice Mn-doped CMA-m grain has a promotive effect on CO adsorption capability. FTS evaluation results demonstrate that 15Co/CMA-20 showed the highest CO conversion, C 5+ selectivity and C 5+ STY, benefiting from its high Co 0 dispersion and CO chemisorption capability as a result of suitable Mn doping into the lattice of CoAl 2 O 4 , which was confirmed very different from the influence of impregnated Mn oxide over CoAl 2 O 4 .
✓ 已验证
DOI
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
·
2012
·
IF 4.173
Min Yang,Aijuan Han,Junling Duan,Zhipeng Li,Yongchao Lai,Jinhua Zhan
In this study, an imprinted silica matrix of pentachlorophenol (PCP) co-loaded with Fe 3 O 4 nanoparticles and ZnS:Mn 2+ quantum dots (QDs) was fabricated. The introduction of Fe 3 O 4 nanoparticles to the imprinted matrix provided an easy way to separate PCP under an external magnetic field. ZnS:Mn 2+ QDs offered a readout signal to monitor the amount of PCP bound to the imprinted matrix and evaluate the efficiency of imprinting. X-ray diffraction, transmission electron microscopy, Fourier transform infrared spectroscopy were used to characterize the imprinted matrix. The low angle X-ray diffraction and N 2 adsorption–desorption analysis indicated a periodic mesoporous structure. The as-synthesized imprinted matrix preferred to adsorb PCP rather than the other aromatic compounds like 2,4-dichlorophenoxy acetic acid, 2,4-dichlorophenol and phenol. The recoveries of spiked PCP in spring water and tap water with Fe 3 O 4 –ZnS:Mn 2+ co-loaded MIPs are 101% and 97%, respectively.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Pharmaceuticals
·
2024
·Vol. 17
·期 4
·489
·
IF 4.3
Hao Wang,Chenxuan Zheng,Fanyu Tian,Ziyao Xiao,Zhixiong Sun,Liye Lu,Wenjuan Dai,Qi Zhang,Xuefeng Mei
Curcumin (CUR) is a natural polyphenolic compound with various pharmacological activities. Low water solubility and bioavailability limit its clinical application. In this work, to improve the bioavailability of CUR, we prepared a new co-crystal of curcumin and L-carnitine (CUR-L-CN) via liquid-assisted grinding. Both CUR and L-CN have high safe dosages and have a wide range of applications in liver protection and animal nutrition. The co-crystal was fully characterized and the crystal structure was disclosed. Dissolution experiments were conducted in simulated gastric fluids (SGF) and simulated intestinal fluids (SIF). CUR-L-CN exhibited significantly faster dissolution rates than those of pure CUR. Hirshfeld surface analysis and wettability testing indicate that CUR-L-CN has a higher affinity for water and thus exhibits faster dissolution rates. Pharmacokinetic studies were performed in rats and the results showed that compared to pure CUR, CUR-L-CN exhibited 6.3-times-higher AUC0–tand 10.7-times-higher Cmax.
✓ 已验证
DOI
PubMed
高影响因子
ACS Applied Nano Materials
·
2025
·
IF 5.5
Haocheng Zhai,Baoshan Wu,Shoaib Muhammad,Qihui Sun,Hanrui Tian,Yifan Liu,Panfeng Zhao,Chunhong Mu,Nasir Mahmood,Xian Jian
An ideal microwave absorption material involves multilevel precise regulation and construction at multiple scales, which remains a great challenge. For the first time, we develop a host–guest self-assembling strategy via the entrapment of fullerene C60 molecule guest in a zeolitic imidazolate framework-67 (ZIF-67) host to design the hierarchical structure for a high-performance microwave absorber covering the molecular scale, nanoscale, and microscale synergistic effects. Typically, the two-dimensional orientation growth of microscale ZIF-67 precursors in solution is achieved by introducing C60 molecules. After the accurate pyrolysis process, Co nanoparticles derived from C60@ZIF-67 are embedded into ultrathin carbon flake (CF) substrates, favoring uniformity, size diminishment, and surface stability. These as-synthesized uniformly dispersed C60/Co/CF composites possess advantages of dual dielectric and magnetic loss functions, exhibiting the great microwave absorption properties with a minimum reflection loss of −58.03 dB and the effective absorption bandwidth of 5.94 GHz. This proposed host–guest self-assembling strategy has great potential for the synthesis of other metal–organic framework materials in the field of microwave absorption.
✓ 已验证
DOI
高影响因子
Small
·
2015
·Vol. 11
·期 24
·2893-2902
·
IF 8.368
Yuefei Wang,Renliang Huang,Wei Qi,Yanyan Xie,Mengfan Wang,Rongxin Su,Zhimin He
The wetting and drying of drops on flexible fibers occurs ubiquitously in nature, and the capillary force underlying this phenomenon has motivated our great interest in learning how to direct supramolecular self-assembly. Here, the hierarchical co-assembly of two aromatic peptides, diphenylalanine (FF) and ferrocene-diphenylalanine (Fc-FF), is reported via sequential, combinatorial assembly. The resulting dandelion-like microstructures have highly complex architectures, where FF microtube arrays serve as the scapes and the Fc-FF nanofibers serve as the flower heads. Homogeneous FF microtubes with diameters tailored between 1 and 9 μm and wall thickness ranging from 70 to 950 nm are initially formed by controlling the degree of supersaturation of the FF and the water content. Once the FF microtubes are formed, the growth of the dandelion-like microstructures is then driven by the capillary force, derived from the wetting and drying of the Fc-FF solution on the FF microtubes. This simple and ingenious strategy offers many opportunities to develop new and creative methods for controlling the hierarchical self-assembly of peptides and thus building highly complex nano and microstructures.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Nanoscale
·
2025
·
IF 5.1
Xue Wang,Lu-Kang Zhao,Si-Yao Li,Ran Wei,Xuanwen Gao,Zhaomeng Liu,Wenbin Luo
The electrocatalytic reduction of carbon dioxide (CO2) and different nitrogenous substances has shown a broad prospect in replacing the traditional urea synthesis process, but there are still serious challenges in mass transfer at the gas-liquid-solid interface. Unlike conventional CO2 as a carbon source, the conversion of HCO3- and NO3- to urea by C-N coupling process under environmental conditions is a promising alternative to traditional industrial urea synthesis. However, initiating the C-N coupling reaction through the adsorption and activation of HCO3- and NO3- is considerably challenging. Designing and engineering highly selective and active electrocatalysts is necessary to accelerate electrochemical urea synthesis. Herein, we construct a Mott-Schottky heterogeneous catalyst by loading Cu nanoparticles onto WN nanosheets (Cu-WN), achieving the excellent Faradic efficiency (FE) of 15.9% and urea yield rate of 421 µg h-1 mgcat-1 at -0.3V (vs. RHE), outperforming the majority of reported electrocatalysts. The results show the spatial charge region induced by Mott-Schottky heterostructure facilitates the simultaneous adsorption and activation of HCO3- and NO3-, accelerating the multiple-electron transfer process. This work furnishes a promising impetus for the advancement of urea electrosynthesis via electrochemical C-N coupling under ambient conditions.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2025
·
IF 9
Ziyi Deng,Xiaohan Li,Gaosheng Zhang,Guicong Xiao,Yuan Xie,Ru Nie,Shenglin Mai,Jianyou Long,Ziqing Xiao,Ping Zhang,Huosheng Li
Hypochlorite (ClO − )-based chlorination has shown effectiveness in oxidizing and purifying ammonium nitrogen (NH 4 + -N) and thallium (Tl) individually. However, the co-removal of these contaminants remains understudied. Addressing this gap, our study investigated the behaviors and mechanisms of NaClO-based breakpoint chlorination in oxidizing and removing both Tl and NH 4 + -N. The interaction among thallous ions (Tl + ), NH 4 + -N and NaClO in wastewater created a synergistic oxidation effect, which led to high removal efficiencies, exceeding 97 % for both Tl and NH 4 + -N, achieved with a NaClO concentration of 7 mmol/L, across a pH range of 6 to 10 in less than 5 min. Notably, the presence of Tl + , rather than Tl 3+ or Tl 2 O 3 , significantly enhanced the conversion of hypochlorite alongside NH 4 + -N. This coupled process generated chloramines and nitroxyl, along with oxygen-independent hydroxyl radicals formation, which further transformed into chloride radicals, dichlorine radical anions, and chlorine oxide radicals. Introducing these highly reactive species into the binary-pollutant system marked a substantial improvement over single-pollutant systems, yielding significantly higher removal efficiencies. These findings shed new light on the role of Tl in breakpoint chlorination for wastewater containing both Tl and NH 4 + -N.
✓ 已验证
产品关联
DOI
高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2025
·
IF 3.9
Shengbin Dong,Man Wang,Hu Li,Hui Fu,Jie Yang,Minghui Zhu
Low-temperature catalytic oxidation has emerged as one of the most effective methods for removing carbon monoxide due to its economic feasibility. Copper-based (Cu-based) catalysts are increasingly regarded as viable alternatives to noble metal catalysts. While the incorporation of indium (In) into Cu-based catalysts has gained popularity, the impact of the In oxide (In2O3) phase on catalyst performance remains unclear. In this study, we prepared two different In2O3 with cubic (cb) and rhombohedral (rh) phases. Cu is supported on In2O3 via the impregnation method. The Cu/In2O3 catalyst with a cubic phase exhibited a higher CO oxidation activity (T90 = 122 °C). The primary reason for this enhanced activity is that the cubic phase of the In2O3 support promoted the generation of the surface Cu+ species. Based on the in situ DRIFTS results, Cu+ species and Cu+-CO species serve as active sites and active intermediates, respectively, in the CO oxidation reaction.
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）