Scientific Reports
·
2016
·Vol. 6
·期 1
·1-7
·
IF 5.228
Jin Xiaoting,Yu Xiangyang,Zhu Guangyan,Zheng Zuntao,Feng Fayun,Zhang Zhiyong
A high capacity of laccase from Trametes versicolor capable of degrading pesticides has been revealed. The conditions for degrading of five selected pesticides including chlorpyrifos, chlorothalonil, pyrimethanil, atrazine and isoproturon with the purified laccases from Trametes versicolor were optimized. The results showed that the optimum conditions for the highest activity were pH at 5.0 and temperature at 25 °C. The best mediators were violuric acid for pyrimethanil and isoproturon, vanillin for chlorpyrifos, and acetosyringone and HBT for chlorothalonil and atrazine, respectively. The laccase was found to be stable at a pH range from 5.0 to 7.0 and temperature from 25 to 30 °C. It was observed that each pesticide required a different laccase mediator concentration typically between 4.0–6.0 mmol/L. In the experiment, the degradation rates of pyrimethanil and isoproturon were significantly faster than those of chlorpyrifos, chlorothalonil and atrazine. For example, it was observed that pyrimethanil and isoproturon degraded up to nearly 100% after 24 hours while the other three pesticides just reached up 90% of degradation after 8 days of incubation.
研究领域:
环境生物学
·
酶学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CHEMICAL PHYSICS LETTERS
·
2019
·
IF 1.901
Fan Li,Wanjun Xu,Linyi Lu,Kai Zhou,Zhining Xia
The high-quality sulfur-doped graphite (SGi) was prepared from concentrated sulfuric acid-graphite intercalation compounds (H 2 SO 4 -GICs) by solid-state microwave irradiation, where H 2 SO 4 was the sulfur (S) source and S-doping occurred within a minute. The preparation of H 2 SO 4 -GICs was a key step for S-doping and exfoliation process. Notably, it was found that S-doping was influenced by the dosage of H 2 SO 4 , where the lower dosage of H 2 SO 4 was beneficial for the S-doping. The exfoliation efficiency was greatly affected by the temperature and dosage of oxidant, where lower temperature and lower dosage of KMnO 4 guaranteed efficient exfoliation.
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
RESEARCH ON CHEMICAL INTERMEDIATES
·
2013
·Vol. 40
·期 4
·1633-1636
·
IF 0.88
Qin Qi-xue,Yang Jian,Yang Bo
Abstract A facile and simple procedure for the synthesis of norathyriol using Pd(II) as a catalyst via two steps under mild conditions is described. The major advantages of this method are the use of a commercially available catalyst, short reaction times, and the simplicity of the reaction and work-up. The overall yield of 36.6 % is acceptable. Graphical Abstract All reactions were monitored by TLC . The UV-Vis spectra of the product and the intermediate are as follows:
研究领域:
有机化学
·
药物化学
✓ 已验证
DOI
高影响因子
ENERGY & FUELS
·
2025
·
IF 5.3
Jinsong Luo,Tianci Xiao,Xiang Li,Qingyu Wang,Xusheng Zheng,Jiuzhong Yang,Chengyuan Liu,Yang Pan
The methanol-to-hydrocarbon (MTH) reaction offers a promising non-fossil fuel pathway for the production of olefins and aromatics. A formaldehyde (HCHO) intermediate has attracted great attention due to its critical role in the aromatization and coking process of the MTH reaction. However, because of the difficulty in the direct detection of HCHO, details on the impact of reaction condition on its formation and conversion were seldom studied. Here, synchrotron radiation photoionization mass spectrometry (SR-PIMS) was applied to thoroughly study the changes in HCHO and other relevant species under different reaction conditions, including contact time, temperature, zeolite acidity, and methanol concentration. It is revealed that higher temperature and acidity promoted the formation of HCHO and its transformation to aromatics and coke, whereas higher methanol concentration mainly enhanced hydrogen transfer reactions, resulting in a higher yield of polyunsaturated species and, consequently, more aromatics. Combining the results from SR-PIMS and soft X-ray absorption spectroscopy of the spent catalyst, it is verified that HCHO formation promoted coke formation, but the presence of olefinic species can shift the methanol conversion pathway toward methylation reactions and then limit the level of HCHO yield. Therefore, we proposed a butanol cofeeding strategy that can limit the contribution of HCHO-induced coke formation and extend the catalyst lifetime by up to ∼60%.
研究领域:
化学工程
·
催化科学
✓ 已验证
产品关联
DOI
高影响因子
Frontiers of Environmental Science & Engineering
·
2020
·Vol. 14
·期 3
·1-13
·
IF 4.053
Jiang Chaojin,Jiang Xiaoqian,Zhang Lixun,Guan Yuntao
A new technique of zero-valent zinc coupled with ascorbic acid (ZVZ/AA) was developed and applied to debrominate the 2,2′,4,4′-Tetrabromodiphenyl ether (BDE-47), which achieved high conversion and rapid debromination of BDE-47 to less- or non-toxic forms. The reaction conditions were optimized by the addition of 100 mg/L ZVZ particles and 3 mmol/L AA at original solution pH = 4.00 using the solvent of methanol/H 2 O (v:v = 4:6), which could convert approximately 94% of 5 mg/L BDE-47 into lower-brominated diphenyl ethers within a 90 min at the ZVZ/AA system. The high debromination of BDE-47 was mainly attributed to the effect of AA that inhibits the formation of Zn(II)(hydr)oxide passivation layers and promotes the corrosion of ZVZ, which leads to increase the reactivity of ZVZ. Additionally, ion chromatography and gas chromatography mass spectrometry analyses revealed that bromine ion and lower-debromination diphenyl ethers formed during the reduction of BDE-47. Furthermore, based on the generation of the intermediates products, and its concentration changes over time, it was proposed that the dominant pathway for conversion of BDE-47 was sequential debromination and the final products were diphenyl ethers. These results suggested that the ZVZ/AA system has the potential for highly efficient debromination of BDE-47 from wastewater.
研究领域:
环境科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
INTEGRATED FERROELECTRICS
·
2017
·
IF 0.457
Shuai Zhang,Guo-Ling Li,Hai-Lin Cong,Bing Yu,Xing-Yu Gai
Monodispersed silica spheres were prepared by an effective method, which an ethanolic solution of tetraethyl orthosilicate (TEOS) was continuously supplied to the reaction mixture containing KCl electrolyte, water, TEOS, ethanol and ammonia. The particle size of the silica spheres ranged from 2.0 to 4.5 µm. In addition, the effects of reaction conditions such as temperature and amount of ammonia on microsphere morphology were studied.
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF SOLID STATE CHEMISTRY
·
2023
·
IF 3.3
Tong Yongchun,Feng Min,Wei Jihong,Huang Qiaozhen,Wang Qingyun
A novel low-cost solvent-thermal method was proposed for the preparation of cobalt blue (CoAl 2 O 4 ) pigments. The effects of solvent composition , reaction time, reactant molar ratio, and reaction temperature on the structure and tone of the synthesized pigments were investigated. The results revealed that the optimal process conditions for the synthesis of uniform, vibrant cobalt blue pigments were obtained when the volume ratio of alcohol-water was 1:1, the molar ratio of Co 2+ to Al 3+ was 1:3, the reaction time was 4 h, and the reaction temperature was 200 °C. This solvothermal synthesis method is mild, cost-effective, and easily controllable, thus making it highly suitable for industrial applications.
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
RSC Advances
·
2017
·Vol. 7
·期 25
·15272-15277
·
IF 3.108
Yunhua Li,Juan Fu,Binghui Chen
Ni2P supported catalysts have extensively been studied for various hydrodeoxygenation (HDO) reactions. However, the main products are cyclohexane or cyclohexanol for lignin-derived compounds HDO over these catalysts. In this study, we investigate the catalytic conversion of anisole, phenol and guaiacol to benzene over Ni2P/SiO2 by probing the reaction conditions. The results show that a lower reaction temperature and higher H2 pressure favour the hydrogenation of these model chemicals to cyclohexane, whereas a higher reaction temperature and lower H2 pressure aid the generation of benzene. The cyclohexane and benzene yields are 89.8% and 96.0% at 1.5 MPa and 573 K and 0.5 MPa and 673 K, respectively. By eliminating the influence of internal and external diffusion, the low intrinsic activation energy of 58.2 kJ mol−1 is obtained, which explains the high catalytic activity. In addition, although guaiacol HDO has a low conversion due to the space steric effect of its substituents, it presents a similar reaction pathway to obtain anisole and phenol, which is dependent on reaction conditions. The long-run evaluation experiment shows that the activity and selectivity of anisole HDO to benzene changes slightly for 36 h.
研究领域:
化学工程
·
催化科学
✓ 已验证
DOI
高影响因子
AUSTRALIAN JOURNAL OF CHEMISTRY
·
2023
·Vol. 76
·期 4
·194-200
·
IF 1.1
Zhijun Yuan,Yunshi Liang,Yiting He,Huiying Deng,Haiting Wu,Bohong Lin,Jing Zhang
AlCl3-mediated protodeboronation of arylboronic acids and esters is reported herein. This method features mild reaction conditions, high reaction yields, as well as short reaction times. Mechanistic studies based on 11B NMR spectroscopy suggest that it might proceed through initial boron activation by coordination of AlCl3 to the oxygen atom of arylboronic acid or ester groups.
研究领域:
有机化学
·
催化化学
✓ 已验证
DOI
高影响因子
BIORESOURCE TECHNOLOGY
·
2015
·
IF 4.494
Yue Shen,Jian-Kui Sun,Yu-Xuan Yi,Bo Wang,Feng Xu,Run-Cang Sun
A simple and effective route for the production of levulinic acid (LA) from cellulose has been developed in SO 3 H-functionalized ionic liquids. The effects of ionic liquid structures, reaction conditions and combination of metal chlorides with ILs on the yield of LA were investigated, where the highest yield of 39.4% was obtained for 120 min in the presence of 1-(4-sulfonic acid) butyl-3-methylimidazolium hydrogen sulphate ([BSMim]HSO 4 ) with addition of H 2 O. The catalytic activities of ionic liquids depended on the anions and decreased in the order: CF 3 SO 3 − > HSO 4 − > OAc − , which was in good agreement with their acidity order. The ILs play a dual solvent-acid role for the cellulose conversion into LA and exhibited favorable catalytic activity over four repeated runs.
研究领域:
化学工程
·
可再生能源
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CRYSTENGCOMM
·
2020
·Vol. 23
·期 3
·671-677
·
IF 3.117
Sanzhao Song,Jian Sun,Jing Zhou,Chengzhi Guan,Zhiwei Hu,Ting-Shan Chan,Xian-Long Du,Xiao Lin,Jun Hu,Linjuan Zhang,Jian-Qiang Wang
Molten salts have been reported to be excellent media for the preparation of multicationic oxides, which require harsh conditions to crystallize. Molten salt synthesis provides a wider operational temperature range (usually extends to 1000 °C) and faster mass transport and nucleation processes, thus allowing the preparation of crystalline solids, which require higher temperatures, such as perovskites. However, the mechanisms that control the solid-state formation and phase selection are poorly understood. Herein, several typical molten alkali metal halide (Cl−) and oxosalt (CO32− and SO42−) systems were employed as the reaction media for the synthesis of LaCoO3 (LCO) crystals, and the effects of ionic salt species on the morphological, geometric and electronic structures of LCO crystals were examined by using X-ray diffraction (XRD), scanning electron microscopy (SEM) and X-ray absorption spectroscopy (XAS). The LCO perovskite was successfully synthesized in a molten NaCl–KCl eutectic mixture at 700 °C, which was lower than that used for the conventional mixed oxide synthesis. Our results show that in the molten salt synthesis, the type of reaction medium, calcination temperature, the ratio of salt, and reaction time govern the microscopic mechanisms in the preparation of multicationic oxides. Most importantly, we observed that LaOCl was formed as an intermediate, which plays a key role in the reaction pathway for the phase-selective synthesis of perovskite LCO.
研究领域:
材料科学
·
化学
✓ 已验证
产品关联
DOI
高影响因子
HETEROCYCLIC COMMUNICATIONS
·
2023
·Vol. 29
·期 1
·
IF 2.3
Mingyu Zhang,Yuqi Tang,Rui Xu,Dong Yan,Shuangping Xu,Yanqing Qu,Jingyu Xu,Hongge Jia
Due to the chemical properties of Group VIII transition metals and their importance in catalytic processes, the reactions of rhodium and its neighboring organic complexes have received much attention as model systems. In the present experiments, we successfully prepared two new rhodium complexes named [Rh(cod)(TTP)Cl] and [Rh(cod)(CDP)Cl] using tri( o -tolyl)phosphine and clohexyldiphenylphosphine as ligands, respectively, and the proofs of their structures were completed using 1 H NMR and 13 C NMR. Subsequently, it was applied to the polymerization reaction of phenylacetylene (PA), and the effects of different solvents, time, and temperature on the yield and molecular weight of the polymerization reaction products were discussed. The experimental results show that both complexes can play a catalytic role in the polymerization of PA. From the point of view of polymer molecular weight, the best reaction conditions for both catalysts were 3 h at 20°C in THF solvent (molecular weight up to 2.40 × 10 5 ). From the point of view of yield, the best reaction conditions for both catalysts were 4 h at 35°C in THF solvent (yield up to 89.2%).
研究领域:
化学
·
材料科学
✓ 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）