Tài liệu, luận văn, đồ án, tiểu luận, đề tài về Hóa Học
Five flavonoids, including quercetin (1) and four its derivatives, quercitrin (2), isoquercitrin (3), astibin (4), and rutin (5), together with two phenolic glycosides, 3,3′-di-O-methylellagic acid 4-O-β-D-xylopyranoside (6), and aesculin (7) were isolated from the whole plants of Macrosolen bidoupensis Tangane & V.S. Dang. Their chemical structu...
5 trang | Chia sẻ: thuyduongbt11 | Ngày: 17/06/2022 | Lượt xem: 197 | Lượt tải: 0
Quinoxaline subsidiaries are a significant class of nitrogen-containing heterocycles, as they establish helpful intermediates in organic synthesis. This substructure plays a significant role as an essential skeleton for the plan of various heterocyclic compounds with various biological activities, hence thesecompounds significant in the field...
6 trang | Chia sẻ: thuyduongbt11 | Ngày: 17/06/2022 | Lượt xem: 656 | Lượt tải: 0
In this work, metal nanoparticles were successfully synthesized through the reduction of metal salts using reducing agents such as: ethylene glycol (EG) and sodium borohydride (NaBH4). These metal nanoparticles were impregnated into the supports M-X (M = Ni, Pd; X = Bent, C, Zeolite, and Al2O3) in high yield. The physio-chemical properties of th...
6 trang | Chia sẻ: thuyduongbt11 | Ngày: 17/06/2022 | Lượt xem: 315 | Lượt tải: 0
In artificial photosynthesis process the photocatalyst-enzyme attached system is a best strategy to utilize solar energy for solar chemical/fuels production. Herein, we prepared a solar light active graphene-based photocatalyst received by the covalent attachment of 9-aminoanthracene (AA) chromophore with chemically converted graphene (CCG) for ...
5 trang | Chia sẻ: thuyduongbt11 | Ngày: 17/06/2022 | Lượt xem: 210 | Lượt tải: 0
Nowadays, waste of electrical and electronic apparatuses generated in huge amount surround the earth and has become a global environmental issue. Electronic waste contains large amounts of metal ions, such as Au, Ag, Cu, Pd, Pb and Cd etc., resulting in a threat to the environment, ecosystems and human health. Therefore, removal of metal ions an...
8 trang | Chia sẻ: thuyduongbt11 | Ngày: 17/06/2022 | Lượt xem: 717 | Lượt tải: 0
The municipal landfill is considered to be a potential source of different environmental contaminants derived from consumer goods, including perfluorinated chemicals (PFCs). Twenty-four leachate, surface water samples and twentyfour sediment samples collected at Tay Mo landfill (Hanoi, Vietnam) and surrounding areas were analysed for sixteen PFCs...
8 trang | Chia sẻ: thuyduongbt11 | Ngày: 17/06/2022 | Lượt xem: 262 | Lượt tải: 0
In this work, the polyaniline/reduced graphene oxide (PANi/rGO) bilayer was directly electrodeposited on carbon screen-printed electrodes (SPE). Some details in growth of PANi/rGO bilayer were revealed from cyclic voltammograms and X-ray photoelectron spectra. The growth of stacked rGO film at high compactness on the electrode surface is mainly ...
10 trang | Chia sẻ: thuyduongbt11 | Ngày: 17/06/2022 | Lượt xem: 725 | Lượt tải: 0
First, the surface of carbon nanotubes (CNTs) was modified by epoxidation reaction to create epoxidized CNTs
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7 trang | Chia sẻ: thuyduongbt11 | Ngày: 17/06/2022 | Lượt xem: 186 | Lượt tải: 0
One icetexane diterpenoid, demethylsalvicanol (1) and four abietane diterpenoids, sageone (2), 20-deoxocarnosol (3), 11,12,20-trihydroxy-abieta-8,11,13-triene (4), and 7α-ethoxyrosmanol (5) were isolated from the n-hexane layer of the leaves and twigs of Rosmarinus officinalis L. Chemical structures of compounds were identified by ESI-MS, 1D-, 2...
6 trang | Chia sẻ: thuyduongbt11 | Ngày: 17/06/2022 | Lượt xem: 191 | Lượt tải: 0
The polar constituents of Clerodendrum inerme collected from coastal area of Thai Binh province were investigated. From the water soluble fraction of the C. inerme stems, four lignan and lignan glucosides (1-4) along with a phenolic glucoside (5) were isolated. Their chemical structures were established as icariol A2 (1), syringaresinol-4-O- -g...
5 trang | Chia sẻ: thuyduongbt11 | Ngày: 17/06/2022 | Lượt xem: 298 | Lượt tải: 0