Đồ án, luận văn, do an, luan van

Highly effective photocatalyst of TiO₂ nanoparticles dispersed on carbon nanotubes for methylene blue degradation in aqueous solution
In the present study, titania nanoparticles are highly dispersed on carbon nanotubes via hydrolysis process of tetraisopropyl-orthotitanate Ti[OCH(CH3)2]4 (TPOT). The obtained composite (TiO2/CNTs) is characterized by modern methods. The anatase-TiO2 phase is realized based on X-ray diffraction spectrum at different pHs of hydrolysis solution. Th...
12 trang | Chia sẻ: thuyduongbt11 | Ngày: 17/06/2022 | Lượt xem: 294 | Lượt tải: 0
Effect of stabilizing and brightening agents and some operated conditions on electroplating kinetics of NiCu alloys from citrate-sulfate solutions
The effect of stabilizing and brightening additives, temperature and stirring on electrodeposited kinetics of NiCu alloy has been studied by the linear polarization method. The additives almost do not affect on the electrochemical reduction rate of Cu2+ ions, however it has a much affect on the reduction rate of Ni2+ ions. The presence of boric a...
5 trang | Chia sẻ: thuyduongbt11 | Ngày: 17/06/2022 | Lượt xem: 267 | Lượt tải: 0
A new approach for the synthesis of sotolon in racemic and enantioenriched forms
Sotolon (3-hydroxy-4,5-dimethyl-2(5H)-furanone) has been synthezised both in racemic and enantioenriched forms by a short sequence involving intramolecular tandem isomerization-aldolisation and tandem izomerization/Mannich reactions as key steps. Optically active Sotolon has been obtained by using (S)-N-tert-butane sulfinimine as a chiral starti...
5 trang | Chia sẻ: thuyduongbt11 | Ngày: 17/06/2022 | Lượt xem: 730 | Lượt tải: 0
Anti-inflammatory metabolites from a marine sponge-associated fungus Aspergillus sp. IMBC-FP2.05
Chemical investigation of the marine sponge-derived fungal strain Aspergillus sp. IMBC-FP2.05 resulted in isolation of five compounds, including JBIR-74 (1), homogentisic acid (2), methyl (2,5-dihydroxyphenyl)acetate (3), 3- chloro-2,5-dihydroxybenzyl alcohol (4), and p-hydroxybenzaldehyde (5). Their chemical structures were identified by compre...
5 trang | Chia sẻ: thuyduongbt11 | Ngày: 17/06/2022 | Lượt xem: 600 | Lượt tải: 0
Synthesis, characterization and biological activity of mixed ligand chelates of Ni(II) with pyridoxalthiosemicarbazone and dipeptides
The synthesis, characterization of mixed ligand chelates of Ni(II), [NiAL] involving Pyridoxalthiosemicarbazone (A) and dipeptides (L) viz., glycyl-glycine (gly-gly), glycyl-L-leucine (gly-leu), glycyl-L-tyrosine (gly-tyr) and glycylL-valine (gly-val) and their biological activities have been studied. The complexes were characterized based on thei...
12 trang | Chia sẻ: thuyduongbt11 | Ngày: 17/06/2022 | Lượt xem: 211 | Lượt tải: 0
Essential oils of Tunisian Pinus radiata D. Don, chemical composition and study of their herbicidal activity
Little is known about the phytotoxic effects of essential oils from Pine species, GC and GC/MS analysis of Pinus radiata D. Don essential oil obtained from needles, resulted in the identification of 49 components comprising 97.6 % of the oil totality. The composition was l dominated by monoterpene hydrocarbons (86.4 %) with β-pinene (40.2 %), li...
6 trang | Chia sẻ: thuyduongbt11 | Ngày: 17/06/2022 | Lượt xem: 394 | Lượt tải: 0
Isolation of lignans and neolignans from Pouzolzia sanguinea with their cytotoxic activity
One lignan (7′S,8′R,8S)-4,4′-dihydroxy-3,3′,5,5′-tetramethoxy-7′,9-epoxylignan-9′-ol-7-one (1) together with four neolignans (7α,8α)-dihydrodehydrodiconiferyl alcohol 9-O-β-D-glucopyranoside (2), (7α,8α)-dihydrodehydrodiconiferyl alcohol 9′-O-β-D-glucopyranoside (3), icariside E3 (4), and icariside E5 (5) were isolated from Pouzolzia sanguinea. T...
7 trang | Chia sẻ: thuyduongbt11 | Ngày: 17/06/2022 | Lượt xem: 387 | Lượt tải: 0
Synthesis of 2-(3-methyl-5-oxo-4,5-dihydro-1H-pyrazol-1-yl) quinazolin-4(3H)-one derivatives
A simple, synthesis of 2-(3-methyl-5-oxo-4, 5-dihydro-1h-pyrazol-1-yl) quinazolin-4(3H)-one 6(a-d) derivatives, an easy, clean, and economical methodology has been defined. The development of a new pathway for the preparation of substituted derivatives of Quinazoline Pyrazole is highlighted in this report. The mild, inexpensive polyphosphoric ac...
6 trang | Chia sẻ: thuyduongbt11 | Ngày: 17/06/2022 | Lượt xem: 291 | Lượt tải: 0
Nitrate, nitrite, and lead contamination in leafy vegetables collected from local market sites of Go Vap district, Ho Chi Minh City
Lead, nitrate, and nitrite are among the major contaminants of vegetables. These concentrations appraise the quality characteristic of vegetables. Governments and regulators has control the level of nitrate, nitrite, and lead in vegetables to protect the human health. The present study was initiated to investigate the levels of these contaminants...
8 trang | Chia sẻ: thuyduongbt11 | Ngày: 17/06/2022 | Lượt xem: 352 | Lượt tải: 0
Phytochemical investigation of Eurycoma longifolia roots collected in Gia Lai province, Viet Nam
From the roots of Eurycoma longifolia, seven compounds including β-carboline-2N-oxide-1-propionic acid (1), 9,10-dimethoxycanthin-6-one (2), β-carboline-1-propionic acid (3), infractine (4), eurylene (5), eurycomanone (6), 14,15-β-hydroxyklaineanol (7) were isolated. Their structures were determined by means of spectroscopic methods (UV, IR, HR-...
6 trang | Chia sẻ: thuyduongbt11 | Ngày: 17/06/2022 | Lượt xem: 244 | Lượt tải: 0