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Vanillin conversion by aldol condensation using hydrotalcite Mg-Al and modified - Y zeolite as heterogeneous catalysts
Abstract. Mg-Al hydrotalcite, MgO-Al2O3 mixed oxides, and modified-Y zeolite (sulfated Y zeolite and copper ion-exchanged Y zeolite) were prepared and characterized by XRD, EDX, and XRF techniques. These materials were used as heterogeneous catalysts in aldol condensation of vanillin and acetone. The obtained results showed that the heterogeneou...
13 trang | Chia sẻ: thanhle95 | Ngày: 07/07/2021 | Lượt xem: 391 | Lượt tải: 0
Enhancement of specific absorption rate in MnFe2O4/Co0.7Zn0.3Fe2O4 AND MnFe2O4/Co0.5Zn0.5Fe2O4 composite nanoparticles
Abstract. We utilize an advantage of the exchange coupling between MnFe2O4 nanoparticles and Co0.7Zn0.3Fe2O4 or Co0.5Zn0.5Fe2O4 nanoparticles to enhance the specific absorption rate (SAR) in magnetic nanosystems for advanced magnetic hyperthermia therapy. All samples were synthesized by the hydrothermal method. We find that while the saturation ...
10 trang | Chia sẻ: thanhle95 | Ngày: 07/07/2021 | Lượt xem: 390 | Lượt tải: 0
Effect of cerium salt activated ceria on the UV degradation resistance of waterborne epoxy coatings
Abstract. Ce (III) salt-activated CeO2 nanoparticles were incorporated into waterborne epoxy coating to improve the UV stabilisation of epoxied system. The surface morphology of the coatings was examined by using color spectrophotometer during the UV exposure test. The degradation of the epoxy coatings was observed by the change of barrier prope...
10 trang | Chia sẻ: thanhle95 | Ngày: 07/07/2021 | Lượt xem: 415 | Lượt tải: 0
Modification of graphene oxide by curcumin and application in polyurethane coating
Abstract. Curcumin modified graphene oxide (GO-CR) was prepared using the adsorption method and polyurethane (PU) coating containing 0.3 wt% GO-CR was prepared on carbon steel. Synthesized GO-CR was characterized by Fourier transform infrared spectroscopy (FTIR), X-ray diffraction (XRD), scanning electron microscopy (SEM) and zeta potential meas...
8 trang | Chia sẻ: thanhle95 | Ngày: 07/07/2021 | Lượt xem: 385 | Lượt tải: 0
Chemical composition and major volatile compounds of the hydrolyzed product from Kappaphycus alvarezii by-products using flavourzyme
Abstract The chemical composition of flavourzyme hydrolysis product from Kappaphycus alvarezii by-products was analyzed. The results showed that the protein hydrolysate powder had high content of proteins (21.66%) and low content of lipids (0.22%). Hydrolyzed products contained about 15 free amino acids with relatively high content of some amin...
8 trang | Chia sẻ: thanhle95 | Ngày: 07/07/2021 | Lượt xem: 448 | Lượt tải: 0
$Geo-chemical fractionations of arsenic and lead in the surface sediments of Thuy Trieu lagoon, Khanh Hoa province$ Geo-chemical fractionations of arsenic and lead in the surface sediments of Thuy Trieu lagoon, Khanh Hoa province
Abstract The sequential extraction method of Tessier et al. was applied to identify the phase associations of As and Pb in the surface sediment of Thuy Trieu lagoon. The results showed that these two metals were mainly found in the residual fractions. Meanwhile, the carbonate fractions stayed at the lowest portions. Levels of arsenic and lead a...
9 trang | Chia sẻ: thanhle95 | Ngày: 07/07/2021 | Lượt xem: 495 | Lượt tải: 0
Determination of caffeine in the leaves and flowers of Camellia chrysantha by high-performance liquid chromatography with dad detection
Abstract. Caffeine (1,3,7-trimethylxanthine) is naturally found in the leaves, seeds or fruits of over 63 plants species worldwide. It is contained highly in coffee, tea, cacao beverage products. Caffeine showed good effects in enhancing performance and perception of exercise, reducing fatigue and drowsiness, and improving memory and learning ef...
7 trang | Chia sẻ: thanhle95 | Ngày: 07/07/2021 | Lượt xem: 477 | Lượt tải: 0
Study on the removal of ammonium in wastewater using adsorbent prepared from rice hull and magnesium chloride
Abstract. This study aimed to evaluate the ability of magnesium chloride modified carbonized rice hull (MCRH) material for ammonium removal from synthetic and domestic wastewater. The MCRH material was prepared by using waste rice hull from a household rice-processing factory and magnesium chloride salt via a simple mixing and annealing method. ...
11 trang | Chia sẻ: thanhle95 | Ngày: 07/07/2021 | Lượt xem: 664 | Lượt tải: 0
Macro-zooplankton abundance in relation to metal accumulation and water quality in Truc Bach lake
Abstract. Urban lake pollution is one of the serious issues due to suffering of waste discharged from householders. However, there is a gap of knowledge about the diversity of zooplankton species and how metals accumulate in zooplankton in urban ecosystems. We addressed this by determining the rule of blooming macro-zooplankton in the Truc Bach ...
8 trang | Chia sẻ: thanhle95 | Ngày: 07/07/2021 | Lượt xem: 395 | Lượt tải: 0
Removal of nickel, copper, and zinc ions from aqueous solution using coffee bean husk (CFH)
Abstract. Agricultural waste has received much attention for its potential of being efficient and low-cost adsorbents to remove heavy metals from water. This paper presents a batch investigation of the potential of an adsorbent produced from coffee bean husk for removing copper, nickel and zinc ions from aqueous solution. At the initial pH of 5....
7 trang | Chia sẻ: thanhle95 | Ngày: 07/07/2021 | Lượt xem: 437 | Lượt tải: 0

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