Finding the Specific Surface Area of an Organomineral Sorbent Produced by Electroplasma Treatment of Coal Flotation Waste

2021 ◽  
Vol 887 ◽  
pp. 603-609
Author(s):  
A.S. Kondratenko ◽  
S.L. Buyantuev ◽  
S.Yu. Shishulkin
Keyword(s):  
Specific Surface ◽  
Surface Area ◽  
Specific Surface Area ◽  
Thermal Activation ◽  
Thermal Destruction ◽  
Adsorption Model ◽  
Langmuir Adsorption ◽  
Coal Flotation ◽  
Solid Adsorbent ◽  
Before And After

This paper dwells upon finding the specific surface area of cake, a coal enrichment waste, exposed to electroplasma treatment; the goal is to make an organomineral porous material to be used as a sorbent for wastewater treatment. The research team used a monomolecular Langmuir adsorption model and surface tension of the surfactants before and after adsorption at the interface of solution and solid adsorbent. Another process considered herein was thermal activation of substances in the electroplasmic reactor for making organomineral porous materials from coal cakes. The paper presents the resulting specific surfaces area of the organomineral sorbent thus produced. Thus, the waste of flotation, i.e. coal cake, is fundamentally suitable for making porous substances by thermal destruction in an electroplasma reactor.

Effect of Crystals Size, Surface Area and Pore Size of Hydroxyapatite Microspheres on the Loading Ability of Bovine Serum Albumin

2011 ◽  
Vol 197-198 ◽  
pp. 17-20
Author(s):  
Jun Ming Li ◽  
Ai Juan Wang ◽  
Yu Peng Lv ◽  
Bai Ling Jiang
Keyword(s):  
Bovine Serum Albumin ◽  
Serum Albumin ◽  
Specific Surface ◽  
Pore Size ◽  
Surface Area ◽  
Specific Surface Area ◽  
Bovine Serum ◽  
Crystal Size ◽  
Adsorption Ability ◽  
Before And After

Effect of crystals size, surface area, pore size and porosity of hydroxyapatite microspheres on the loading ability of bovine serum albumin was studied in this paper. The surface morphology, specific surface area and porosity of hydroxyapatite microspheres were characterized by scanning electron microscope, specific surface area and pore size analyzer, respectively. The concentration of BSA in aqueous solutions both before and after adsorption was determined by ultraviolet-visible spectrophotometer. The results indicated that the adsorption behavior of bovine serum albumin appeared to obey the Langmuir-type isotherm model. Fast adsorption appeared at the beginning, and then decreased gradually. Hydroxyapatite microspheres calcined at 600°C had the maximum capacity, and those calcined at 800°C showed lower adsorption ability. The loading ability of hydroxyapatite microspheres depended on its crystal size, specific surface area, pore size and porosity, etc.

Synthesis and Characterization of Porous Mo-W Oxide Nanostructures

2008 ◽  
Vol 8 (12) ◽  
pp. 6445-6450
Author(s):  
F. Paraguay-Delgado ◽  
Y. Verde ◽  
E. Cizniega ◽  
J. A. Lumbreras ◽  
G. Alonso-Nuñez
Keyword(s):  
Electron Microscopy ◽  
Specific Surface ◽  
Surface Area ◽  
Specific Surface Area ◽  
Synthesis Method ◽  
Atomic Ratio ◽  
High Specific Surface Area ◽  
X Ray Diffraction ◽  
Transmission Electron ◽  
Before And After

The present study reports the synthesis method, microstructure characterization, and thermal stability of nanostructured porous mixed oxide (MoO3-WO3) at 550 and 900 °C of annealing. The material was synthesized using a hydrothermal method. The precursor was prepared by aqueous solution using ammonium heptamolibdate and ammonium metatungstate, with an atomic ratio of Mo/W = 1. The pH was adjusted to 5, and then the solution was transferred to a teflon-lined stainless steel autoclave and heated at 200 °C for 48 h. The resultant material was washed using deionized water. The specific surface area, morphology, composition, and microstructure before and after annealing were studied by N2 physisorption, scanning electron microscopy (SEM), analytical transmission electron microscopy (TEM), and X-Ray diffraction (XRD). The initial synthesized materials showed low crystallinity and high specific surface area around (141 m2/g). After thermal annealing the material showed higher crystallinity and diminished its specific surface area drastically.

scholarly journals Polyamide-6 surface cracked forms nanofibers: A novel way for increasing the surface roughness, and porosity

2021 ◽  
Author(s):  
Sedigheh Aghayari
Keyword(s):  
Surface Roughness ◽  
Water Treatment ◽  
Specific Surface ◽  
Surface Area ◽  
Specific Surface Area ◽  
Pore Volume ◽  
Polyamide 6 ◽  
Bet Method ◽  
Before And After ◽  
The Web

Abstract Here away used to reduce the porosity of the nanofibers, which is removing PVA nanofibers from PVA/PA6 nanofibers by water treatment. Measuring the porosity of the electrospun web before and after treatment by the BET method proved this. The specific surface area of the web was 60 % reduced after water treatment. Surface roughness and pore volume have reduced after water treatment. Also, I introduced BET as the method for measuring the diameters of mesopores (or lower than 100nm). I used BET to prove that the cracks can make mesopores on the nanofibers.

Preparation of Porous Silica by Acid Dissociation of Thermally Activated Kaolinite

2011 ◽  
Vol 284-286 ◽  
pp. 1381-1384 ◽  
Author(s):  
Guang Hui Li ◽  
Wei Cheng ◽  
Tao Jiang ◽  
Na Sun ◽  
Ling Feng Ai
Keyword(s):  
Specific Surface ◽  
Surface Area ◽  
Specific Surface Area ◽  
Thermal Activation ◽  
Porous Silica ◽  
Acid Dissociation ◽  
Tem Analysis ◽  
Thermally Activated ◽  
High Resolution Tem ◽  
The Relationship

Preparation of porous silica from thermally activated kaolinite was investigated by using acid dissociation process, and the relationship between structural transformation and acid dissociation properties of aluminium were elucidated. AlVI transfers into AlV and AlIV when kaolinite changes into metakaolinite during thermal activation. AlV is dissoluble in acid, while AlVI, AlIV are difficult to be dissolved into acid, therefore, the coordinations of aluminium affect acid dissociation of alumina markedly. Mesoporous silica is made by acid dissociation alumina of metakaolinite, and the specific surface area of porous silica is determined by acid dissociation ratio of alumina. The dissociation ratio of aluminum is up to 97% when kaolinite is activated at 900°C for 15 min. Specific surface area of the porous silica material is 357 m2/g, the pore volume is 0.43 cc/g, and BJH pore diameter is 2.18 nm. The pore is found to be in the worm-like shape by high resolution TEM analysis.

SEM and BET Methods for Investigating the Structure and Morphology of Co - Ce Catalysts for Production of Light Olefins

2008 ◽  
Vol 61 (2) ◽  
pp. 144 ◽  
Author(s):  
Ali A. Mirzaei ◽  
Maryam Galavy ◽  
Vahid Eslamimanesh
Keyword(s):  
Specific Surface ◽  
Surface Area ◽  
Specific Surface Area ◽  
Catalytic Performance ◽  
Light Olefins ◽  
Molar Ratio ◽  
Surface Areas ◽  
Preparation Conditions ◽  
Bet Specific Surface Area ◽  
Before And After

Co–Ce catalysts prepared by the coprecipitation method were tested for production of light olefins. The effect of different preparation conditions including the [Co]/[Ce] molar ratio, aging time, calcination conditions, different supports, and loading of optimum support on the structure and catalytic performance of different catalysts were investigated. It was found that catalyst containing 80% Co/20% Ce/15% SiO2, which was aged for 2 h and calcined at 600°C for 6 h, is the optimum modified catalyst for the conversion of synthesis gas to light olefins. Characterization of both precursors and calcined catalysts (before and after the test) was carried out using scanning electron microscopy (SEM) and Brunauer-Emmett-Teller (BET) specific surface area measurements. The morphology of the catalysts was investigated by SEM and the surface areas of these catalysts were studied by BET. It was shown that all of the different preparation variables influenced the morphology and also the specific surface area of the catalyst precursors and calcined catalysts.

scholarly journals Review of Several Experimental Methods for Characterization of Micro- and Nano-Scale Pores in Cement-Based Material

2020 ◽  
Vol 14 (1) ◽  
Author(s):  
Abudushalamu Aili ◽  
Ippei Maruyama
Keyword(s):  
Specific Surface ◽  
Pore Size Distribution ◽  
Pore Size ◽  
Size Distribution ◽  
Surface Area ◽  
Sorption Isotherm ◽  
Specific Surface Area ◽  
Experimental Techniques ◽  
Proton Nuclear Magnetic Resonance ◽  
Adsorption Model

AbstractMechanical properties and durability of cement-based materials are largely affected by pore structures. This paper provides an overview of several experimental techniques to characterize pore size distribution and specific surface area, with focus on pores in calcium silicate hydrates. The reviewed experimental techniques are nitrogen and water vapor sorption isotherm, proton nuclear magnetic resonance (1H-NMR) and small-angle scattering (SAS). Different pretreatment methods are compared for sorption measurements. Pore size distribution and specific surface area are analyzed using data from different methods to understand difference and consistency of these methods. It is found that pore size distribution calculated from sorption isotherm is very sensitive to adsorption model. Though specific surface areas from different techniques are quite different from each other, they are all able to detect the microstructural alteration due to long-term drying.

Modification of Cellulase to Different Bleached Softwood Pulp

2012 ◽  
Vol 550-553 ◽  
pp. 1186-1189
Author(s):  
Min Du ◽  
Xin Ping Li ◽  
Jin Wang ◽  
Peng Zhou Wang
Keyword(s):  
Specific Surface ◽  
Surface Area ◽  
Specific Surface Area ◽  
Water Retention ◽  
Raw Material ◽  
Enzymatic Modification ◽  
Water Retention Value ◽  
Wetting Properties ◽  
Before And After ◽  
Wetting Property

Cellulase named as Novozym 476 was used to modify three kinds of bleached softwood pulps respectively. By analyzing the changes of refining degree, water retention value, specific surface area, wetting properties of fiber before and after enzymatic treatment, studied the influence of characteristics of raw material to the effect of enzymatic modification. The results indicate that in the same conditions, the refining property, water retention value, specific surface area and wetting property of the three pulps all increase. Among these three pulps, the pulp of Kamloops Kraft has the best modification effect. Refining degree of Kamloops Kraft pulp increases 36.0 °SR when refining for 10,000 PFI revolutions, and the water retention value increases by 68.0%, the dye loading increases with 0.1 mg/g, the contact angle decreases by 4.5%. It illustrates that the fiber raw material with a thin cell wall would have a better effect of enzymatic modification and the wrapping way of microfibers would influence the effect of enzymatic modification.

Effect of Roasting on Pore Properties of Fly Ash

2012 ◽  
Vol 454 ◽  
pp. 179-182
Author(s):  
Jun Tao Chen ◽  
Shu Fang Ding ◽  
Chun Hua Bai ◽  
Hui Ping Wang ◽  
Yan Xu
Keyword(s):  
Fly Ash ◽  
Specific Surface ◽  
Surface Area ◽  
Specific Surface Area ◽  
Pore Volume ◽  
Xrd Analysis ◽  
Before And After ◽  
Roasting Temperature ◽  
Pore Properties

Fly ash roasted by different temperature, XRD analysis of fly ash after roasting, specific surface area and pore properties of fly ash roasted before and after were tested. Results showed that roasting influenced significantly on pore properties of fly ash; Specific surface area, pore volume and amount of middle pore of fly ash increased with roasting temperature increased , then reached maximum at 700 °C, and decreased with roasting temperature increased.

scholarly journals NITROGEN THERMAL DESORPTION OF AS A CONTROL METHOD FOR DETERMINATION OF THE NANOPARTICLE SIZE IN COMPOSITIONS BASED ON ZINC OXIDE AND HYDROXYAPATITE

2021 ◽  
pp. 294-299
Author(s):  
Евгения Владимировна Мараева ◽  
Вячеслав Алексеевич Мошников
Keyword(s):  
Zinc Oxide ◽  
Specific Surface ◽  
Surface Area ◽  
Specific Surface Area ◽  
Thermal Desorption ◽  
Control Method ◽  
Chemical Deposition ◽  
Bioactive Coatings ◽  
Sorption Method ◽  
Before And After

Работа посвящена анализу возможности применения метода тепловой десорбции азота для определения размеров наночастиц в композициях на основе гидроксиапатита и оксида цинка, изготовленных в форме таблеток с помощью ручного гидравлического пресса. Исходные порошки гидроксиапатита получены методом химического осаждения с использованием микроволнового излучения. С применением сорбционного метода БЭТ анализируется удельная поверхность порошков, составляющих композиции, до и после прессования, исследуется влияние состава композиций на удельную поверхность. Приводится расчет средних размеров наночастиц в композициях на основе результатов сорбционных измерений в рамках моделей сферических и стержневидных наночастиц. Область применения рассматриваемых материалов - медицина, в том числе использование в адресной доставке лекарств и в костной инженерии в качестве биоактивных покрытий, нанесенных на поверхность металлического биоимплантата. In this paper we consider the possibility of using the nitrogen thermal desorption method for determining the size of nanoparticles in compositions based on hydroxyapatite and zinc oxide. The compositions in the form of tablets were obtained using a manual water press. The initial powders of hydroxyapatite were obtained by chemical deposition using a microwave radiation. Using the BET sorption method, the specific surface area of the powders is analyzed before and after pressing, and the effect of the composition formulation on the specific surface area is investigated. The calculation of the average sizes of nanoparticles in composites is given on the basis of the results of sorption measurements within the framework of the models of spherical and rod-like nanoparticles. The field of application of the materials under consideration is medicine, including the use of nanocomposites in targeted drug delivery and in bone engineering as bioactive coatings applied to the surface of a metal bioimplant.

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