Crystals
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2018
·Vol. 8
·期 2
·73
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IF 2.144
Yucun Cui,Zheng Yan,Mengli Li,Jie Zhu,Longfeng Zhu,Hong Yao,Xuebo Cao
We report a solvent-free synthesis of all silica Beta zeolite using a cheap organic template of tetraethylammonium bromide (TEABr). The method includes mixing, grinding and heating solid raw material in the absence of water solvent but the presence of zeolite seeds. The absence of water solvent significantly improves the efficiency of synthesis, while the addition of seeds remarkably enhances the crystallization rate. In addition, the use of a cheap organic template of TEABr greatly decreases the synthesis cost. The effects of the reaction compositions, including the molar ratios of NH4F/SiO2, TEABr/SiO2, and mass ratios of seeds to the silica, on the synthesis of the pure product were investigated using different temperature. Physicochemical characterizations, including XRD, SEM, TG and N2sorption, show that the zeolitic product has good crystallinity, uniform crystals, and high surface area.Keywords:zeolite;all silica Beta;solvent-free synthesis;tetraethylammonium bromide;cheap
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
APPLIED ORGANOMETALLIC CHEMISTRY
·
2020
·Vol. 35
·期 1
·e6027
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IF 3.14
Zinan Dai,Zehao Yu,Ying Bai,Jiayun Li,Jiajian Peng
A simple method for the hydrosilylation of olefins by using air-stable cobalt catalysts is developed. The catalyst system is composed of simple, cheap, and readily available cobalt(II) salts and well-defined terpyridine derivatives as cocatalysts or ligands, and the hydrosilylation processes can be processed smoothly under mild conditions without either Grignard reagents or NaHBEt 3 as activator.
研究领域:
有机化学
·
催化化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF SEPARATION SCIENCE
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2018
·Vol. 41
·期 8
·1812-1820
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IF 2.415
Qianjun Liu,Di Chen,Jiyuan Wu,Guangcai Yin,Qintie Lin,Min Zhang,Huawen Hu
A quick, easy, cheap, effective, rugged, and safe procedure was designed to extract pesticide residues from fruits and vegetables with a high percentage of water. It has not been used extensively for the extraction of phthalate esters from sediments, soils, and sludges. In this work, this procedure was combined with gas chromatography with mass spectrometry to determine 16 selected phthalate esters in soil. The extraction efficiency of the samples was improved by ultrasonic extraction and dissolution of the soil samples in ultra-pure water, which promoted the dispersion of the samples. Furthermore, we have simplified the extraction step and reduced the risk of organic solvent contamination by minimizing the use of organic solvents. Different extraction solvents and clean-up adsorbents were compared to optimize the procedure. Dichloromethane/ n -hexane (1:1, v/v) and n -hexane/acetone (1:1, v/v) were selected as the extractants from the six extraction solvents tested. C18/primary secondary amine (1:1, m/m) was selected as the sorbent from the five clean-up adsorbents tested. The recoveries from the spiked soils ranged from 70.00 to 117.90% with relative standard deviation values of 0.67–4.62%. The proposed approach was satisfactorily applied for the determination of phthalate esters in 12 contaminated soil samples.
研究领域:
环境科学
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分析化学
✓ 已验证
DOI
高影响因子
CRYSTENGCOMM
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2020
·Vol. 22
·期 28
·4790-4796
·
IF 3.117
Kaixuan Zhao,Zhijie Yang,Huiying Wei,Jinxin Guo,Yanzhao Yang,Jingjing Wei
The prevalent synthesis of colloidal metal oxide nanocrystals relies on the synthesis of various precursors, such as organometallic compounds, which are usually sensitive to moisture or oxygen and generally expensive. Based on the economic efficiency, the costs of the starting materials and synthetic process should be addressed. Herein, a general simple synthetic procedure from inexpensive and nontoxic precursors is developed. Under optimized reaction conditions, MnO nanocrystals are synthesized with commercially purchased bulk manganese oxides as starting materials, such as MnO, MnO2, and Mn3O4. The size and morphologies of nanoparticles are modulated by tuning the types and dosage of coating agents. Moreover, this synthetic strategy is further extended to other nanoparticles including Fe3O4 nanocrystals and FeMnOx nanocrystals. Furthermore, Re doped MnO nanocrystals exhibiting fluorescence properties have been synthesized with this method, which endows the fluorescence properties to these oxide nanocrystals.
研究领域:
材料科学
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纳米技术
·
化学
✓ 已验证
产品关联
DOI
高影响因子
COMPOSITES PART B-ENGINEERING
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2023
·
IF 13.1
Wen Zhang,Guang-Rui Xu,Qiong Zhang,Yingxiu Zhao,Yanyan Li,Zexing Wu,Jie Liu,Zhenjiang Li,Lei Wang
Industrial application of electrochemical hydrogen production urgently requires the development of highly efficient, stable, and inexpensive electrocatalysts that can drive a large current density. Here, Ag@Pt icosahedral nanocrystals (Ag@Pt icosahedral NCs) catalysts were successfully prepared through one-step solvothermal synthesis for addressing those challenges. The synergies of geometric effect and electronic effect triggered by the discrepancy of different components greatly enhance the electrocatalytic performance in the hydrogen evolution reaction (HER) process at large current densities over wide pH ranges. Excitingly, the Ag@Pt icosahedral NCs could reach 4000 mA cm −2 at 232 mV under the acidic medium and also showed efficient catalytic activity in 1 M KOH and 1 M phosphate buffered saline (PBS) media, improving their potential application in industrialization. Density functional theory (DFT) calculation results show that the electronic synergistic effect brought by the core-shell structure weakens the optimal free energy of hydrogen adsorption (ΔG H* ), promoting the water decomposition kinetics and greatly achieving high catalytic performance.
研究领域:
材料科学
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电化学
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催化
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纳米技术
·
能源材料
✓ 已验证
产品关联
DOI
高影响因子
GREEN CHEMISTRY
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2015
·Vol. 18
·期 6
·1738-1750
·
IF 8.02
Jiliang Ma,Linxin Zhong,Xinwen Peng,Runcang Sun
A simple and effective synthesis of 3,4-dihydropyrimidin-2(1H)-ones/thiones and their derivatives from aldehydes, β-dicarbonyl compounds and urea or thiourea using D-xylonic acid both as a green solvent and an effective catalyst is described. Taking the environment and economy into account, the work presented here has the merits of environmental friendliness, easy operation, simple work-up, excellent yields and the avoidance of organic solvents and inexpensive catalysts. In addition, the good properties of D-xylonic acid have also been validated by the synthesis of 5-phenyl-1(4-methoxyphenyl)-3[(4-methoxyphenyl)-amino]-1H-pyrrol-2(5H)-one and 12-phenyl-9,9-dimethyl-8,9,10,12-tetrahydrobenzo[a]xanthen-11-one. The synthesized compounds were characterized by FT-IR, 1H NMR, 13C NMR and melting point.
研究领域:
有机化学
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绿色化学
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催化
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合成
✓ 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）