Surface area

This paper studied the synthesis of calcium oxide (CaO) from snail shells by calcination, crushing, and grinding. Then, the sample was analyzed by X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), scanning electron microscopy (SEM), specific surface area (BET), and particle size.

10p viengfa 28-10-2024 1 1   Download

This paper introduces a methodology for generating an inundation map for rainy season and river network. To achieve this objective, we investigated the use of the recently developed Modified Normalized Difference Water Index (MNDWI) within the Google Earth Engine platform for extracting surface water.

11p vibecca 01-10-2024 1 1   Download

The study was carried out to assess microplastic contamination in surface waters and beach sediments around the coastal areas of Quy Nhon city. The water and sediment samples were collected at 4 sites along Quy Nhon beach for analysis.

11p viyoko 01-10-2024 6 1   Download

Impervious surface is an artificial surface that prevents water from seeping into the ground. Impervious surface is not only an indicator of the level of urbanization but also a key indicator of the quality of the urban environment. This article presents the results of an impervious surface classification in Ho Chi Minh City area from multi-temporal Landsat image data.

13p viyoko 01-10-2024 3 1   Download

In this study, perovskite BaTiO3 and SrTiO3 catalysts were prepared using the sol-gel method for oxidative coupling of methane (OCM). Characterization of catalysts was investigated by X-ray diffraction for crystal properties, physical N2 adsorption to determine specific surface area, and temperatureprogrammed techniques to examine the redox properties and acid–base strength.

6p vikwong 29-09-2024 1 1   Download

Porous carbon material is one of the most common and very important for various applications thank to its high surface area and adsorption capability. In this study, mesoporous carbon was prepared by thermal decomposition of copper-based metal-organic framework MOF-199 under inert atmosphere and followed by immersing in diluted HNO3 solution in order to remove metal/metal oxide and activation of the resultant porous carbon.

5p vikwong 29-09-2024 4 1   Download

In this research, we focus on enhancing the BET surface area of the photocatalytic process. The combination of SiO2 with TiO2 in TiO2-SiO2 photocatalyst make the photocatalyst achieved large specific surface area a factor effect directly to adsorption, which is the first step of photocatalytic process.

9p vikwong 29-09-2024 7 1   Download

For the first time, the expansion grade of graphite was studied through the effect of the flake size. The result shown the larger flake size exhibits a higher expansion grade. In addition, the more expanded material, the higher specific surface area can be obtained. The synthesized expanded graphites were used for the adsorption of methylene blue.

5p vikwong 29-09-2024 6 1   Download

The higher catalytic performance of CuMnOx than MnO2, CuO because of its higher specific surface area and its lower reduction temperature. The results also implied that the interaction between Cu and Mn could improve the reduction capacity of CuMnOx catalyst. In summary, the CuMnOx catalyst is a promising catalyst for toluene treatment.

7p vikwong 29-09-2024 4 1   Download

This article reported the preparation of Nano CeO2 by acid method from Binh Dinh monazite ore. Obtained CeO2 was examined by the method of X-ray diffraction (XRD), scanning electron microscopy (SEM) and transmission electron microscopy (TEM), energy-dispersive X-ray spectroscopy (EDS), specific surface area analysis by Brunauer-Emmet-Teller (BET) method, UVVIS.

5p vikwong 29-09-2024 2 1   Download

Non-metallic C, N, and S doped TiO2 materials were prepared using the hydrothermal method from titanyl sulfate solution with different doped precursors. The influence of non-metallic elements on crystal structure, morphology, surface area, bonding state, and light absorption ability of materials was studied through XRD, SEM, BET spectra, and UVis - DRS.

5p vikwong 29-09-2024 3 1   Download

Zeolite Socony Mobil-5 (ZSM-5) was successfully synthesized by a hydrothermal method from the silicon dioxide (SiO2) precursor prepared fro m rice husk ash. Titanium dioxide (TiO2) nanoparticles were decorated on ZSM-5 substrate by a sol-gel method. ZSM-5/TiO2 materials were characterized by Fourier-transform infrared spectroscopy (FTIR), X-ray diffraction (XRD), transmission electron microscope (TEM), and Brunauer-Emmett-Teller (BET) surface area analysis.

6p vikwong 29-09-2024 1 1   Download

A series of Mg-Cu-Al hydrotalcite/chitosan materials have been synthesized via a co-precipitation method, in which chitosan is synthesized from chitin extraction from waste shrimp shells. The obtained solids were characterized by XRD, BET, EDX, IR techniques. The materials have a well crystallized hydrotalcite structure and medium surface area.

5p vikwong 29-09-2024 3 1   Download

In this study, a CuZnO2/MSU photocatalyst was developed using a simple method and common resources. Characterization through XRD, BET, EDX, TEM, and SEM techniques revealed its worm-hole structure and uniform CuZnO2 distribution. The catalyst exhibited a reduced band gap of 2.4 eV and a substantial surface area of 307 m²/g, facilitating 94% degradation of Ciprofloxacin (CIP) within 4 hours of light exposure.

7p vikwong 29-09-2024 3 1   Download

This study focuses on the inner city first where a citywide network of water surface and city parks has already existed yet continues to decrease in both quantity and quality under the huge impact of today’s rapid urbanisation in the vigorous development of the market economy.

8p viyoko 24-09-2024 1 1   Download

The objectives of this study are to evaluate the role of land surface, soils and climate characteristics on the groundwater balance within the area of Long Bien district of Hanoi and to answer the question if the expected land cover and land use changes in the near future are critical for sustainable management of groundwater resources in the area.

5p viyoko 24-09-2024 3 0   Download

With the impact of global climate change, saline intrusion into surface water in coastal areas has become a major issue. The water treatment using surface water in these areas has to deal with double issues including organic matters and salinity. This paper evaluated the trihalomethanes formation during the treatment of surface water at pilot scale using different disinfection dose and at different salinity levels.

11p vifaye 20-09-2024 1 1   Download

Harvesting microalgae by centrifugation and filtration is very costly, affecting technical and economical feasibility of downstream processing of algal biomas to bioproducts. Flocculation is a potential technique for recovery of algae biomass. Particularly, flocculation using magnetic nanoparticles offers high separation efficiency due to their high surface area and magnetic properties. I

10p dianmotminh02 03-05-2024 5 1   Download

The study results show inter-relationships and transformations of the three indicators in the research context, where urban land temperature and Urban Heat Island (UHI) are raised by built-up areas and in contrast, reduced by vegetated areas. As a result, urban green space would be a driver to mitigate the harmful impact of the "heat island" effect in urban areas. Aim to strengthen concentrated green areas and vegetation in land areas that are less favorable for construction.

11p dianmotminh02 03-05-2024 7 2   Download

The aim of the work "Activated carbon derived from rice husk by NaOH activation and its application in supercapacitor" is to prepare a low-cost, high specific surface area activated carbon with microporous and mesoporous ranges using rice husk as the raw material. The effects of activation temperature on the specific surface area, pore structure, morphology and thermal stability of the AC samples have been examined. The AC samples were proved to be excellent electrode material for supercapacitor, hence solve the disposal and pollution problems of rice husk.

9p runordie3 27-06-2022 12 3   Download