Biogenic, sedimentary, and metamorphic limestone: a comparative characterization of soil amendment

ABSTRACT Liming acid soils is fundamental for agricultural activity such as the study and characterization of alternative liming material. The objective of this study was to characterize biological, sedimentary, and metamorphic limestones. The following limestones were studied: biogenic (BL), sedimentary (SL), commercial (CL), and marble (ML). This study evaluated total relative neutralizing power (TRNP), chemical composition, specific surface area, and Ca2+and Mg2+release at concentrations of 0.10, 0.50, 1.00, and 2.00 mol L-1 HCl, in addition to the effects on the soil 90 days after limestone application. The Si identified contributed to the lower TRNP of BL (73.7%) and CL (74.4%). At the lowest HCl concentrations, BL was the most reactive, but with an increase in concentration, ML became the most reactive. The highest CaO (58.32%) and MgO (13.05%) levels were observed in SL and ML, respectively, which contained the highest Ca2+(3.95 cmolcdm-3) and Mg2+ (1.09 cmolcdm-3) concentrations when applied to the soil. All the limestones increased pH and lowered soil H+Al. Soil Ca2+and Mg2+were influenced by the composition of the amendments.

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Elucidating the Origin of the Toxicity of Nano-CeO2 to Chlorella pyrenoidosa：the Role of Specific Surface Area and Chemical Composition

Environmental Science Nano ◽

10.1039/d0en01177k ◽

2021 ◽

Author(s):

Changjian Xie ◽

Yuhui Ma ◽

Peng Zhang ◽

Junzhe Zhang ◽

Xiaowei Li ◽

...

Keyword(s):

Chemical Composition ◽

Specific Surface ◽

Surface Area ◽

Specific Surface Area ◽

Aquatic Environment ◽

Cerium Dioxide ◽

Environmental Application ◽

Ecotoxicological Effects

With the increasing environmental application and discharge of nano cerium dioxide (nano-CeO2), it is urgent to fully understand its ecotoxicological effects on the aquatic environment. This study for the first...

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Comparative Analysis on Chemical Composition and Charcoal Characterization of Two Miscanthus Species

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.415-417.1265 ◽

2011 ◽

Vol 415-417 ◽

pp. 1265-1272

Author(s):

Wen Biao Zhang ◽

Wen Zhu Li ◽

Bing Song Zheng

Keyword(s):

Chemical Composition ◽

Specific Surface ◽

Water Content ◽

Surface Area ◽

Specific Surface Area ◽

Ph Value ◽

Perennial Grass ◽

Water Extract ◽

Carbonization Temperature ◽

Hot Water

Miscanthus is a highly productive, rhizomatous, C4 perennial grass that should be considered as an excellent active carbon precursor. This paper compares the charcoal characterization and chemical composition between M. sinensis and M. floridulus. Species differed in water content, hot water extract, 1% NaOH extract, organic solvent extract, cellulose, lignin and ash. Carbonization temperatures have effects on charcoal yields of Miscanthus, which ranged from 23.5% to 48.0% for M. sinensis and 11.3% to 37.2% for M. floridulus. Water content, charcoal density, pH value, and specific surface area of charcoal characterization varied between two species of Miscanthus. The specific surface area increased with the increase of carbonization temperature. The highest specific surface area of M. sinensis and M. floridulus was 351.74 m2g−1and 352.74 m2g−1, respectively, when the carbonization temperature was 800°C.

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Preparation and Characterization of the Typical Pt-NSR Catalyst

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.412.365 ◽

2011 ◽

Vol 412 ◽

pp. 365-369

Author(s):

Yuan Feng Huang ◽

Wei Jun Zhang ◽

Li Shen ◽

Jin Hu ◽

Zhuo Heng Li ◽

...

Keyword(s):

Specific Surface ◽

Surface Area ◽

Specific Surface Area ◽

Performance Testing ◽

High Specific Surface Area ◽

Impregnation Method ◽

Temperature Programmed Reduction ◽

Temperature Programmed ◽

Co Precipitation

A series of Ba-Al-O NSR supports and Pt/Ba-Al-O NSR catalysts are prepared by co-precipitation and impregnation method in this work. The catalyst and the support are characterized by XRD, SEM, SBET performance testing. The structure and texture of the supports is observed and discussed. The results of SBET indicate that the supports possess relative high specific surface area (94~110 m2/g). Temperature programmed reduction is characterized by means of H2-TPR.

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Study on Comparison among Papermaking Powder Properties

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.512-515.2434 ◽

2012 ◽

Vol 512-515 ◽

pp. 2434-2438

Author(s):

Quan Xiao Liu ◽

Wen Cai Xu

Keyword(s):

Particle Size ◽

Chemical Composition ◽

Specific Surface ◽

Surface Area ◽

Specific Surface Area ◽

Preparation Method ◽

Powder Properties

In this paper the comparison among some papermaking powder properties are studied. It shows that the properties of different powders are different because of different chemical composition and different preparation method and their particle size is different for different purpose such as filler and pigment. The particle size of powder for pigment powder is smaller than that for filler. The specific surface area of papermaking filler is lower than 20m2/g, the absorption value of DBP is about 45cm3/100g, the whiteness is up to 90%, and the particle size is about 3µm. The specific surface area of papermaking pigment is lower than 25m2/g, the absorption value of DBP is from 40 cm3/100g to100cm3/100g, the whiteness of clay is up to 50%, the whiteness of GCC and PCC is up to 90%, and the particle size is lower than 2µm. The specific surface area of silica is up to 100m2/g, the absorption value of DBP is up to 100cm3/100g, the whiteness is up to 97%, and the particle size is around 5µm.

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Mineralogical study of clays from Dobrodo, Serbia, for use in ceramics

Clay Minerals ◽

10.1180/clm.2019.49 ◽

2019 ◽

Vol 54 (4) ◽

pp. 369-377 ◽

Cited By ~ 1

Author(s):

Maja Milošević ◽

Predrag Dabić ◽

Sabina Kovač ◽

Lazar Kaluđerović ◽

Mihovil Logar

Keyword(s):

Specific Surface ◽

Cation Exchange ◽

Surface Area ◽

Specific Surface Area ◽

Cation Exchange Capacity ◽

Mineralogical Composition ◽

Exchange Capacity ◽

Mineralogical Characterization ◽

Mineralogical Study

AbstractThis study focuses on the mineralogical characterization of four raw clay samples from Dobrodo deposit, Serbia. Several analytical methods were applied to determine the chemical and mineralogical composition, morphology and physical properties (colour, plasticity, specific surface area, particle size and cation-exchange capacity) of the clay samples. Kaolinite, smectite and illite are the predominant phases in all of the samples studied that contain between 60.2 and 87.1 wt.% of clay. Quartz, feldspars, paragonite and Ti- and Fe-bearing phases were also identified. The relatively high SiO2/Al2O3 mass ratio indicates abundant quartz. The cation-exchange capacity of the samples varied between low and moderately charged clay minerals (12–52 mmol 100 g–1) with specific surface area values ranging from 94 to 410 m2 g–1. The plasticity index values (11–23%) suggest low to moderate plasticity. Preliminary results show that most of the raw clay from Dobrodo deposit might be suitable for use in ceramic applications.

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Fabrication and Characterization of Cu Doped CeO2 by Hydrothermal Process for Antimicrobial Activity

Defect and Diffusion Forum ◽

10.4028/www.scientific.net/ddf.391.114 ◽

2019 ◽

Vol 391 ◽

pp. 114-119 ◽

Cited By ~ 1

Author(s):

Yeon Bin Choi ◽

Jeong Hun Son ◽

Dong Sik Bae

Keyword(s):

Specific Surface ◽

Surface Area ◽

Specific Surface Area ◽

Hydrothermal Process ◽

Antibacterial Properties ◽

Reaction Times ◽

X Ray Diffraction ◽

Spherical Type ◽

Average Size

Cu doped CeO2 nanopowder was synthesized by hydrothermal process at 180°C for 2~10h. The average size and distribution of the synthesized Cu doped CeO2 nanopowder was controlled by reaction times. The crystallinity of the synthesized Cu doped CeO2 nanoparticles was investigated by X-ray diffraction (XRD). The morphology of the synthesized Cu doped CeO2 nanoparticles was observed by FE-SEM. The specific surface area of the synthesized Cu doped CeO2 nanoparticles was measured by BET. The crystal size of the synthesized Cu doped CeO2 nanoparticles decreased with decreasing reaction times. The average size of the synthesized Cu doped CeO2 nanoparticles was below 10nm and narrow, respectively. The shape of the synthesized Cu doped CeO2 nanoparticles was spherical type. The specific surface area of the synthesized Cu doped CeO2 nanoparticles increased with decreasing reaction times. Antibacterial properties of Cu doped CeO2 were analyzed by MIC method. The synthesized Cu doped CeO2 nanopowders showed antibacterial properties against E.coli and B.sub bacteria.

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Measuring specific surface area of snow by near-infrared photography

Journal of Glaciology ◽

10.3189/172756506781828412 ◽

2006 ◽

Vol 52 (179) ◽

pp. 558-564 ◽

Cited By ~ 134

Author(s):

Margret Matzl ◽

Martin Schneebeli

Keyword(s):

Specific Surface ◽

Surface Area ◽

Specific Surface Area ◽

Near Infrared ◽

Two Dimensions ◽

Chemical Models ◽

Snow Stratigraphy ◽

Physical And Chemical

AbstractThe specific surface area (SSA) is considered an essential microstructural parameter for the characterization of snow. Photography in the near-infrared (NIR) spectrum is sensitive to the SSA. We calculated the snow reflectance from calibrated NIR images of snow-pit walls and measured the SSA of samples obtained at the same locations. This new method is used to map the snow stratigraphy. The correlation between reflectance and SSA was found to be 90%. Calibrated NIR photography allows quantitative determination of SSA and its spatial variation in a snow profile in two dimensions within an uncertainty of 15%. In an image covering 0.5–1.0 m2, even layers of 1mm thickness can be documented and measured. Spatial maps of SSA are an important tool in initializing and validating physical and chemical models of the snowpack.

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Characterization of halloysite (North East Rif, Morocco): evaluation of its suitability for the ceramics industry

Clay Minerals ◽

10.1180/clm.2018.5 ◽

2018 ◽

Vol 53 (1) ◽

pp. 65-78 ◽

Cited By ~ 6

Author(s):

Abdelilah El Haddar ◽

Elkhadir Gharibi ◽

Ali Azdimousa ◽

Nathalie Fagel ◽

Iz-Eddine El Amrani El Hassani ◽

...

Keyword(s):

Specific Surface ◽

Surface Area ◽

Specific Surface Area ◽

Fine Particles ◽

High Plasticity ◽

North East ◽

Physico Chemical ◽

Ceramics Industry ◽

Tubular Crystals

ABSTRACTA halloysite clay from Nador (NE Morocco) was studied to evaluate its suitability in the ceramics industry. A cross-section involving all the Messinian facies was performed in the Melilla Neogene basin, at the foot of the Gourougou volcano, to establish the origin of the halloysite and estimate its reserves. White layers of halloysite and red clays rich in smectite occurring in contact with basal-reef limestone were characterized by mineralogical (XRD, IR), textural (SEM) and physico-chemical analyses (grain-size, Atterberg limits, DTA/TG, XRF and specific surface area). Ceramic properties were evaluated for halloysite fired from 500 to 1100°C to evaluate technical processing for ceramic production.The halloysite clay consists of fine particles with a high plasticity and a large specific surface area. The XRD investigation revealed the presence of 7 Å non-hydrated halloysite along with gibbsite, alunite, K-feldspar and traces of smectite and illite.The presence of halloysite was confirmed from the characteristic IR bands at 3695 and 3618 cm−1and the predominance of tubular crystals observed in the SEM. The chemical analysis revealed high contents linked to the presence of Al-rich phases (gibbsite and alunite). DTA/TG and XRD results of fired clay samples proved the dehydroxylation of halloysite and a rearrangement of metakaolinite to form mullite and spinel at 975°C.The Moroccan halloysite might be suitable for refractory ceramic applications. However, addition of quartz sand might be necessary to avoid crack development during firing and to reduce the plasticity of raw halloysite and minimize shrinkage during sintering.

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