MATERIALS RESEARCH BULLETIN
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2017
·
IF 2.446
Hua Liu,Zumin Wang,Haiyan Li,Hao Wang,Ranbo Yu
Industrial wastewater containing both organic and inorganic pollutants is being generated all the time. Efficient materials are highly needed to purify the polluted water. Thus, a hierarchical structured α-Fe 2 O 3 with excellent adsorptive property has been synthesized by using a facile hydrothermal method. It can be prepared in macroscopic quantity. The as-synthesized α-Fe 2 O 3 with silkworm cocoon-like morphology shows high efficiency in adsorbing Congo red (CR), Methyl orange (MO) and Cr(VI). The removal efficiency of CR, MO and Cr(VI) can reach 99.2%, 83.9% and 100% under appropriate conditions. Besides, this α-Fe 2 O 3 shows high adsorptive ability for mixed CR and Cr(VI) in aqueous solution and the final removal rates can reach 94.7% and 97.9%, respectively. The adsorption kinetics fits well with the pseudo-second-order kinetic model. The results indicate that the product may find potential application in purification of wastewater containing both organic and inorganic pollutants.
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JOURNAL OF SEPARATION SCIENCE
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2017
·Vol. 41
·期 3
·797-805
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IF 2.557
Hui Zhang,Xiaojing Zhang,Huijie Jiang,Cong Xu,Shengqiang Tong,Jizhong Yan
Shenqi Jiangtang Granule, a well-known traditional Chinese herbal preparation, has been widely used for the treatment of type II diabetes mellitus. In this work, an ultrafiltration liquid chromatography with quadrupole time-of-flight mass spectrometry method was proposed for the rapid identification of bioactive ingredients from Shenqi Jiangtang Granule using α-glucosidase as an example. First, the chemical profile of this preparation was clarified, including 37 saponins, 17 flavonoids, 37 lignans, and seven other compounds. After incubation with α-glucosidase in vitro, the methanol extract with an IC 50 value of 0.19 mg/mL exhibited significant inhibitory activity. Then, 18 specific binding peaks were screened, and 15 peaks were identified. Among these, ten compounds were reported to have potential α-glucosidase inhibitory activity for the first time. Subsequently, the inhibitory activities of these active compounds were evaluated by ultraviolet spectrophotometry with p -nitrophenyl α -d- glucopyranoside as a substrate. As a result, gomisin J and gomisin D exhibited stronger α-glucosidase inhibitory activities than other active compounds with IC 50 values of 77.69 and 133.85 μM, respectively. The results demonstrated that the integrated ultrafiltration liquid chromatography with mass spectrometry method was an effective and powerful tool for the discovery of active ingredients in Shenqi Jiangtang Granule.
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APPLIED CATALYSIS B-ENVIRONMENTAL
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2017
·
IF 9.446
Jian-guo Guo,Ying Liu,Ying-juan Hao,Yi-lei Li,Xiao-jing Wang,Rui-hong Liu,Fa-tang Li
Heterostructured Bi 3 O 4 Br/α-Bi 2 O 3 nanocomposites are prepared via in situ one-step self-combustion of ionic liquids. Tetrabutylammonium bromide (TBAB) is employed to be fuel, complexing agent for ionic liquids, as well as the reactant supplying Br for the objective material. The ratio of Bi 3 O 4 Br/α-Bi 2 O 3 can be easily adjusted by controlling the amount of TBAB. The heterojunctions show higher photocatalytic ability towards both azo dye methyl orange (MO) and colorless pollutant phenol . The electron spin resonance (ESR) test and p-nitro blue tetrazolium chloride (NBT) degradation result indicate that generation amounts of superoxide anion radicals ( O 2 − ) over heterojunctions are less than that over pure Bi 3 O 4 Br. Photoelectrochemical measurements show that separation efficiencies of photo-generated electrons and holes are decreased after the combination of Bi 3 O 4 Br and α-Bi 2 O 3 . Work function test and scavenger experiments display that holes play key role for pollutant degradation and the position of holes on α-Bi 2 O 3 is lowered via hybridization. Thus, the enhanced photocatalytic activity over composites can be attributed to the position decline of α-Bi 2 O 3 valence band, thus improving the reactivity of holes in direct oxidation of pollutants. In this case, valence band position is confirmed to be more important than separation efficiency of charge carriers in affecting photocatalytic performance.
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IONICS
·
2024
·
IF 2.4
Gu Chengyang,Zhang Zhenzhong,zhang Xiaomin,Zhao Fangxia,Chen Haoyi,Tang Xingfeng
In order to determine the optimal crystalline form of manganese-based catalysts for zinc-air battery cathodes, in this paper nano-α-MnO 2 and amorphous manganese dioxide (AMO) materials were successfully synthesised by hydrothermal and liquid-phase co-precipitation methods, respectively. The results show that the spherical AMO material has larger specific surface area and more mesopores than the rod-like α-MnO 2 . Moreover, AMO has abundant structural defects and short-range ordered atomic arrangements that can enhance the ion diffusion kinetics and improve the catalytic performance of the materials. Through electrochemical tests, it is found that the AMO materials have better catalytic properties compared to α-MnO 2 . At a current of 10 mA/cm 2 , its discharge-specific capacity reached 575.2 mAh/g, which is 11.1% higher than that of 517.8 mAh/g for α-MnO 2 . And AMO have higher peak power density and smaller charge/discharge voltage gaps. In the long-cycle test, the initial round-trip efficiency of the electrode prepared of AMO is also better than that of α-MnO 2 . However, when the AMO electrodes are charged and discharged for a long time, part of the AMO will be converted to α-MnO 2 , which lead to a gradual decrease in the cycling stability of the AMO electrodes. Therefore, this paper concludes that AMO materials are superior to α-MnO 2 as catalysts for zinc-air batteries.
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Food Bioscience
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2024
·
IF 4.8
Linwei Zhao,Donghua Wang,Jiaye Yu,Xu Wang,Tong Wang,Dianyu Yu,Walid Elfalleh
In this study, proanthocyanidins (PA) and α-tocopherol (α-TOC) were co-encapsulated in complex phospholipid liposomes, to improve the chemical stability of PA and α-TOC and the antioxidant properties of the liposomes. The results showed that the liposome had a spherical microstructure with no adhesions. The encapsulation efficiency of PA and α-TOC reached 78.02% ± 2.02% and 81.67% ± 1.25%, respectively, and interacted with the phospholipid bilayer through hydrogen bonding. The addition of hydrogenated soybean lecithin (HSL) conferred better stability to the liposomes and improved their protection against PA and α-TOC. The retention of PA and α-TOC in liposomes remained above 60% after 30 d of storage at 4 °C. Due to the synergistic antioxidant effect of PA and α-TOC, the DPPH radical scavenging activity of PA-TOC-CPL reached 87.52%, which was significantly higher than that of single-embedded PA and α-TOC liposomes. The release of PA and α-TOC from PA-TOC-CPL during simulated digestion was low and the release pattern could be described by the Ritger-Peppas model. This serves as a reference to guide the utilization of HSL and the development of liposomal products with higher antioxidant properties.
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JOURNAL OF ELECTROANALYTICAL CHEMISTRY
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2024
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IF 4.1
Xintong Li,Zhichuan Yang,Xin Zhao,Min Gao,Yu Liu
The use of high-surface-area materials in loading α-Fe 2 O 3 nanoparticles presents an intriguing approach to improve the electrocatalytic efficiency of overall water splitting. Nevertheless, the effective management of α-Fe 2 O 3 nanoparticle size to prevent their agglomeration continues to pose a significant challenge. This study used bio-based porous carbon with a specific surface area of 2876 m 2 /g and a mesoporous ratio of 95 % as a carrier to effectively disperse and inhibit the growth of α-Fe 2 O 3 nanoparticles. The Fe 2 O 3 /NSC -30 was synthesized using urea as a precipitant through an ethylene glycol-assisted hydrothermal method accompanied by high-temperature calcination, with the α-Fe 2 O 3 nanoparticle size being approximately 5.5 nm. The synergistic effect between the ultra-small nanoparticles and the mesoporous structure facilitates the effective diffusion of electrolyte and exposes more catalytic active sites. The Fe 2 O 3 /NSC -30 exhibited remarkable catalytic performance in the OER and HER, as evidenced by the respective low overpotentials of 270 mV and 250 mV at 20 mA cm −2 . Furthermore, when Fe 2 O 3 /NSC -30 was utilized in the overall water-splitting reaction, a low cell voltage of 1.70 V was sufficient to achieve a current density of 20 mA cm −2 . In this study, a new method was proposed for loading ultra-small nanoparticles onto bio-derived mesoporous carbon for promoting overall water splitting with remarkable efficiency.
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POLYMER
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2012
·
IF 3.438
Chunhui Luo,Bin Zhao,Zhibo Li
Four kinds of well defined poly( N -methacryloyl-L-amino acid)s were prepared via reversible addition fragmentation chain transfer polymerization . The effects of molecular structure, molecular weight , and end-group on their responsive properties in water were investigated. We found that the monomer structure is critical for the polymer to exhibit stimuli-responsive properties in water; only polymers derived from aspartic acid showed defined dual thermo- and pH-responsive properties. To study the effects of molecular weight and end group on the lower critical solution temperature behavior of poly( N -methacryloyl- L -β-isopropyl aspartic acid) (PMAIPAC), a series of PMAIPAC homopolymers with controlled molecular weights and narrow polydispersities were prepared and treated with excess radical initiators to give defined end groups. The cloud point of PMAIPAC was found to increase with the increase of solution pH, due to the ionization of carboxylic acid groups, and decrease with the increase of molecular weight. The structure of end groups also affects the cloud point of PMAIPAC particularly for low molecular weight samples at low pH.
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RSC Advances
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2016
·Vol. 6
·期 44
·38447-38453
·
IF 3.289
Qian Zhao,Qingyang Liu,Huihui Xu,Yiling Bei,Shengyu Feng
A series of α-amine ketoximesilanes were prepared and used as auto-catalyzed cross-linkers in one component room temperature vulcanized (RTV) silicone rubber. The synthesized α-amine ketoximesilanes were characterized by Fourier transform infrared spectroscopy (FT-IR) and nuclear magnetic resonance (NMR). Better performances of RTV silicone rubber including tack free time, viscosity, mechanical performances and thermal stability using α-amine ketoximesilanes as cross-linkers were successfully obtained, in comparison to those performances of RTV silicone rubber using commercial methyltris(methylethylketoxime)silane (MOS) as a cross-linker and dibutyltin dilaurate as a catalyst. Further, we applied density function theory (DFT) method to confirm α-amine ketoximesilanes plays a autocatalytic effect in the hydrolytic reaction of α-amine ketoximesilanes with H2O. The experimental results showed that using α-amine ketoximesilanes as cross-linkers is a practical way to obtain RTV silicone rubber with excellent properties, as well as avoiding using high chemical toxicology of organic metal catalyst in curing system.
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ChemCatChem
·
2017
·Vol. 9
·期 16
·3144-3152
·
IF 4.803
Yong Yuan,Shouying Huang,Hongyu Wang,Yifan Wang,Jian Wang,Jing Lv,Zhenhua Li,Xinbin Ma
Graphical Engineered catalysts : A monodisperse nano-Fe 3 O 4 on α-Al 2 O 3 catalyst synthesized by a novel two-step method of thermal decomposition and impregnation shows enhanced activity and stability for the Fischer–Tropsch synthesis to lower olefins. The effects of promoters (K and S) and size are investigated as well. The Fischer–Tropsch synthesis to lower olefins (FTO) is a desirable nonpetroleum-based route to produce basic chemicals. A novel two-step method was applied to synthesize iron-based supported catalysts, which is to prepare nano-Fe 3 O 4 first by thermal decomposition method and sequentially load them on α-Al 2 O 3 by impregnation. TEM and XRD results manifested that the controllable, uniform Fe 3 O 4 nanoparticles are monodispersed on the surface of α-Al 2 O 3 . H 2 -TPR demonstrated that the reduction of Fe species was facilitated because of the weak interaction between Fe species and the support. These superior properties contribute to an enhanced catalytic activity and stability compared with the catalyst prepared by directly impregnating ammonium iron citrate on α-Al 2 O 3 . Then, the effect of promoters was investigated at the same Fe loading and nanoparticle size. The appropriate addition of K could enhance the catalytic activity and suppress the secondary hydrogenation. On the contrary, S has a negative impact on CO conversion and strongly decreases C 5+ selectivity. Particularly, the combination of K and S could obtain more pronounced CO conversion and higher lower olefins selectivity (≈40 %). Furthermore, size effects were explored by precisely tailoring the iron oxide particle size with the Fe loading kept constant. It was found that 12.0 nm nano-Fe 3 O 4 on α-Al 2 O 3 with or without K plus S promoters showed the best catalytic activity among the catalysts with different particle size.
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APPLIED BIOCHEMISTRY AND BIOTECHNOLOGY
·
2015
·Vol. 178
·期 8
·1471-1480
·
IF 1.735
Zheng Jian-yong,Liu Yin-yan,Luo Wei-feng,Zheng Ren-chao,Ying Xiang-xian,Wang Zhao
A new esterase-producing strain ( Bacillus cereus WZZ001) which exhibiting high hydrolytic activity and excellent enantioselectivity on rac -α-ethyl-2-oxo-pyrrolidineacetic acid methyl ester ( R , S - 1 ) has been isolated from soil sample by our laboratory. In this study, the stereoselective hydrolysis of ( R , S - 1 ) was performed using the recombinant Bacillus cereus esterase which expressed in Escherichia coli BL21 (DE3). Under the optimized conditions of pH 8.0, 35 °C, and concentration of substrate 400 mM, a successful enzymatic resolution was achieved with an e.e.
s of 99.5 % and conversion of 49 %. Immobilization considerably increased the reusability of the recombinant esterase; the immobilized enzyme showed excellent reusability during 6 cycles of repeated 2 h reactions at 35 °C. Thereby, it makes the recombinant B. cereus esterase a usable biocatalyst for industrial application.
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MATERIALS CHEMISTRY AND PHYSICS
·
2015
·
IF 2.259
Gang Jian,Fang Meng,Dongxiang Zhou,Qiuyun Fu,Zhili Du,Chao Yan
A textured CoFe 2 O 4 ceramic was fabricated by reactive template grain growth (RTGG) method using rod-like α-FeOOH particles as templates. The template particles were synthesized by hydrothermal method , the particles showed good crystallization and rod-like shape with a diameter of 0.1–0.2 μm and an aspect ratio of 20–50. { ll0 } oriented CoFe 2 O 4 ceramic was obtained after a sintering process. The ceramic sintered at 1150 °C for 4 h showed dense and oriented structure with orientation degree of 0.89. Different magnetic hysteresis loops were observed along the in-plane and out-of-plane direction of the textured CoFe 2 O 4 , which was due to anisotropy properties of the sample. The textured ceramic exhibited an in-plane M s enhancement (355 emu/cm 3 ) compared to that of the non-textured ceramics (320 emu/cm 3 ) in the same sintering conditions.
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ORGANIC & BIOMOLECULAR CHEMISTRY
·
2014
·Vol. 12
·期 18
·2969-2978
·
IF 3.487
Jiajun Zhang,Pinhua Li,Lei Wang
A novel KOAc-promoted α-position C–H activation and alkynylation of ethers with alkynyl bromides to 2-alkynyl ethers has been developed under transition-metal-free and simple reaction conditions. In addition, this methodology can also be extended to the vinylation of ethers with vinyl bromides in excellent regio- and stereo-selectivity. A wide range of direct C(sp)–C(sp3) and C(sp2)–C(sp3) bonds has been formed through this protocol, which offers a new and alternative route.
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