Đồ án, luận văn, do an, luan van

Highly efficient transfer hydrogenation of carbonyl compounds over supported nickel and palladium nanoparticles
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: 495 | Lượt tải: 0
Solar light-driven photocatalyst-enzyme attached artificial photosynthetic system for regeneration and production of 1,4-NADH and L-glutamate
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: 369 | Lượt tải: 0
Adsorption of Ag⁺ ions using hydroxyapatite powder and recovery silver by electrodeposition
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: 864 | Lượt tải: 0
Occurrence of perfluorinated chemicals (PFCs) in leachate, surface water and sediment collected from Tay Mo landfill and surrounding areas
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: 424 | Lượt tải: 0
Acetylcholinesterase sensor based on PANi/rGO film electrochemically grown on screen-printed electrodes
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: 881 | Lượt tải: 0
Effect of epoxydized carbon nanotube master batch on polypropylene film properties
First, the surface of carbon nanotubes (CNTs) was modified by epoxidation reaction to create epoxidized CNTs (O
7 trang | Chia sẻ: thuyduongbt11 | Ngày: 17/06/2022 | Lượt xem: 348 | Lượt tải: 0
Diterpenoids from Rosmarinus officinalis L. and their nitric oxide inhibitory activity
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: 347 | Lượt tải: 0
Lignans from the stems of Clerodendrum inerme Gaertn
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: 502 | Lượt tải: 0
Chrysin flavonoid adsorbed on B₁₂N₁₂ nanocage - A novel antioxidant nanomaterial
Antioxidative activity of chrysin (CYS) on the B12N12 nanocage has been evaluated by density functional theory with B3PW91-D3 and M06-2X-D3 methods. Adsorption behavior and study of topologies demonstrated that the CYS has chemisorbed to the nanocage and shows notable changes in the electronic properties of B12N12. The antioxidant properties of ...
10 trang | Chia sẻ: thuyduongbt11 | Ngày: 17/06/2022 | Lượt xem: 276 | Lượt tải: 0
Oxidation-reduction reactions in geochemistry
There are more than hundred elements in the periodic table and many of them are associated with various geochemical processes. Most of the elements can show more than one oxidation states, therefore, reactions involving oxidation and reduction are of very much importance in geochemistry. Since every change (chemical or physical) is associated wi...
13 trang | Chia sẻ: thuyduongbt11 | Ngày: 17/06/2022 | Lượt xem: 289 | Lượt tải: 0