BIOMASS OF SOSNOWSKYI'S HOGWEED AS RAW MATERIAL FOR 2D THE CARBONIC NANOSTRUCTURES OBTAINING

The possibility of the carbonization of the Sosnowskyi's hogweed (Heracléum sosnówskyi) biomass for obtaining the carbonic nanmaterials was studied. The characteristic of component composition is given and the parameters of the superficially-porous structure of plant biomass are established. The isotherms of adsorption and desorption of nitrogen on the surface are studied and it is shown that they relate to the type II according to the IUPAC classification. The distribution of times according to the sizes is investigated and it is established that the basic portion of the pore space of the vegetable raw material forms the mezopors with an average width 3.5 of nm. The specific surface area according to Brunauer-Emmet-Teller is determined, which composed 16.4 m2/g. Using a method of the carbonization of organic materials under the effect of local extremely high temperatures and oxidizers the synthesis of nanocarbonic powders, which are formed under the conditions of the self-propagating high-temperature synthesis (SHS method), was carried out. By the methods of spectral analysis (Raman spectroscopy, X-ray diffractometry) and electron microscopy it is shown that from their morphometric parameters the particles of the obtained carbonized product correspond to 2D nanocarbon in the form of grafenic nanoplates. The low-defect planar surface and the presence of the oxygen-containing terminal groups are the characteristic properties of new product. The specific surface area, which composed 179.1 m2/g, is determined. The specific surface area, which composed 179.1 m2/g, is determined. It is established that the micropores introduce the basic contribution to the specific surface area of nanomaterial on the basis of the Sosnowskyi's hogweed biomass.

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Study on Nano-Hydroxyapatite Assisted Preparing by Ionic Liquids

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.1015.501 ◽

2014 ◽

Vol 1015 ◽

pp. 501-504 ◽

Cited By ~ 1

Author(s):

Yong Guang Bi ◽

Xu Si Xu

Keyword(s):

Grain Size ◽

Ionic Liquids ◽

Specific Surface ◽

Surface Area ◽

Specific Surface Area ◽

Large Scale ◽

Preparation Method ◽

Raw Material ◽

Large Scale Preparation ◽

Scale Preparation

Papers with Ca (NO3)2• 4H2O and (NH4)2HPO4as raw material, prepared by ionic liquids assisted nanoHAP, resulting hexagonal nanoHAP are crystal grain size are 10-20nm level, are smaller nanometer range ; specific surface area, the findings show that ionic liquids have the technology to promote the significance of the preparation method can provide a reference for large-scale preparation of biomedical nanomaterials.

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Preparation of Adsorbent from Blue Coke Powder and its Application in Coking Wastewater

Materials Science Forum ◽

10.4028/www.scientific.net/msf.695.553 ◽

2011 ◽

Vol 695 ◽

pp. 553-556

Author(s):

Yu Hong Tian ◽

Xin Zhe Lan ◽

Qiu Li Zhang ◽

Juan Qin Xue ◽

Yong Hui Song ◽

...

Keyword(s):

Specific Surface ◽

Surface Area ◽

Specific Surface Area ◽

Removal Rate ◽

Nitrogen Concentration ◽

Ammonia Nitrogen ◽

Raw Material ◽

Coking Wastewater ◽

Adsorption Time ◽

Coke Powder

The low-cost blue coke industrial by-product, blue coke powder was used as raw material for the production of porous carbons adsorbent by steam activating at temperature of 800°C under the atmosphere of N2 for 60 minutes. The specific surface area and pore properties of the adsorbent were characterized by using N2 adsorption-desorption isotherms. Furthermore, the adsorption effects of the adsorbent for ammonia nitrogen in coking wastewater were investigated in terms of particle size, dosage of absorbent and adsorption time. The results show that the specific surface area is 620.94m2/g, the total pore volume is 0.4442cm3/g and the average mesopore size is 4.5808nm, the adsorbent possesses predominant mesoporous structures. In aeration, the removal rate of ammonia nitrogen can reach to 39.5% under the conditions of the ammonia nitrogen concentration of 625mg/L, the dosage of adsorbent 10g/L at the adsorption time of 60 minutes.

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Pore-Scale Imaging of the Oil Cluster Dynamic during Drainage and Imbibition Using In Situ X-Ray Microtomography

Geofluids ◽

10.1155/2018/7679607 ◽

2018 ◽

Vol 2018 ◽

pp. 1-13 ◽

Cited By ~ 3

Author(s):

Junjian Li ◽

Yajun Gao ◽

Hanqiao Jiang ◽

Yang Liu ◽

Hu Dong

Keyword(s):

Specific Surface ◽

Capillary Pressure ◽

Surface Area ◽

Specific Surface Area ◽

Pore Space ◽

Relative Volume ◽

Pore Scale ◽

X Ray ◽

Cluster Dynamic ◽

Remaining Oil

We imaged water-wet and oil-wet sandstones under two-phase flow conditions for different flooding states by means of X-ray computed microtomography (μCT) with a spatial resolution of 2.1 μm/pixel. We systematically study pore-scale trapping of the nonwetting phase as well as size and distribution of its connected clusters and disconnected globules. We found a lower Sor, 19.8%, for the oil-wet plug than for water-wet plug (25.2%). Approximate power-law distributions of the water and oil cluster sizes were observed in the pore space. Besides, the τ value of the wetting phase gradually decreased and the nonwetting phase gradually increased during the core-flood experiment. The remaining oil has been divided into five categories; we explored the pore fluid occupancies and studied size and distribution of the five types of trapped oil clusters during different drainage stage. The result shows that only the relative volume of the clustered oil is reduced, and the other four types of remaining oil all increased. Pore structure, wettability, and its connectivity have a significant effect on the trapped oil distribution. In the water sandstone, the trapped oil tends to occupy the center of the larger pores during the water imbibition process, leading to a stable specific surface area and a gradually decreasing oil capillary pressure. Meanwhile, in oil-wet sandstone, the trapped oil blobs that tend to occupy the pores corner and attach to the walls of the pores have a large specific surface area, and the change of the oil capillary pressure was not obvious. These results have revealed the well-known complexity of multiphase flow in rocks and preliminarily show the pore-level displacement physics of the process.

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Optimization of Experimental Conditions for the Preparation of High Specific Surface Area Bamboo-Based Activated Carbon

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.1090.154 ◽

2015 ◽

Vol 1090 ◽

pp. 154-159

Author(s):

Sheng Zhou Zhang ◽

Hong Ying Xia ◽

Li Bo Zhang ◽

Jin Hui Peng ◽

Jian Wu ◽

...

Keyword(s):

Activated Carbon ◽

Specific Surface ◽

Surface Area ◽

Specific Surface Area ◽

Pore Volume ◽

Total Pore Volume ◽

High Specific Surface Area ◽

Raw Material ◽

Experimental Conditions ◽

Average Pore

Bamboo as the raw material is carbonized to prepare high specific surface area activated carbon by microwave heating under nitrogen atmosphere in our present work. Influences of activation agents on the preparation of activated carbon are studied. The results show that activation agents have a significant influence on the preparation of activated carbon. Under the heating time of 15 min, the adsorption capacity of the activated carbon prepared utilizing KOH as activation agent is the best. When the KOH/C ratio is 4, the iodine number and yield of activated carbon are 2298 mg/g and 39.82%, respectively. The BET specific surface area, total pore volume and average pore diameter of activated carbon are 3441 m2/g, 2.093 ml/g and 2.434 nm, respectively. The micropore volume of 1.304 ml/g is 62.30% of total pore volume, indicating that the activated carbon is microporous activated carbon.

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USE OF OPAL-CRYSTOBALITE-TRIDIMITE MICRO-FILLER IN DENSE AGGREGATE CONCRETE

Bulletin of Belgorod State Technological University named after V G Shukhov ◽

10.34031/2071-7318-2020-5-2-8-17 ◽

2020 ◽

pp. 8-17

Author(s):

N. Lukutcova ◽

A. Pykin ◽

E. Chivikova

Keyword(s):

Specific Surface ◽

Surface Area ◽

Specific Surface Area ◽

Particle Diameter ◽

Component Composition ◽

Average Particle ◽

Maximal Effect ◽

Aggregate Concrete ◽

Optimal Value ◽

Cement System

Opal-cristobalite-tridimite micro-filler (OCTMF) as a component of dense aggregate concrete (DAC), obtained by grinding of sedimentary siliceous rock – abiomorphic silicite fractions of 0.315-0.63 mm was studied considered. The chemical-mineral composition and microstructure of the of OCTMF particles were determined. Comparative analysis of the relationship between particle size distribution, average particle diameter, specific surface area of OCTMF particle and grinding period in shock-abrasive and cavitation mills was carried out. The conductometric express method was applied to study the effect of the OCTMF specific surface area on hydration activity of cement system. The optimal value of OCTMF specific surface area was (880–900 m2/kg), achieved as a result of cavitation dispersion for 5–10 minutes, that provides increasing in t hydration activity of cement system by 52–54 %. The effect of the consumption of components on strength of the DAC after 28 days of hardening was determined using mathematical statistics method. That allows predicting this parameter by varying the component composition of the concrete mix. An assessment of the OCTMF efficiency was made. It was established, the maximal effect of the OCTMF is at concentration up to 5 % (by wt. of cement), that provides an increasing the design compressive strength of DAC up to 126 %.

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Synthesis of Zeolite X From Waste Basalt Powder And Its Efficient Adsorption of Uranyl Ions In Solution

10.21203/rs.3.rs-652504/v1 ◽

2021 ◽

Author(s):

Yong Ai ◽

Na Yin ◽

Yanquan Ouyang ◽

Yuanxin Xu ◽

Pengfei Yang

Keyword(s):

Specific Surface ◽

Surface Area ◽

Specific Surface Area ◽

Adsorption Process ◽

Raw Materials ◽

Low Cost ◽

Raw Material ◽

Uranyl Ions ◽

Zeolite X ◽

Characteristic Functional

Abstract In order to make full use of waste as raw materials to prepare low-cost zeolite, develop green chemical industry and achieve the purpose of treating waste with waste. High-purity zeolite X was prepared by the alkaline fusion hydrothermal method (AFH) using waste basalt powder as raw material, and was used as an adsorbent to investigate the adsorption performance for uranium-containing wastewater. The structure, morphology, specific surface area, chemical composition, chemical bonds, characteristic functional groups and chemical states of surface elements of the samples were characterized by XRD, SEM, BET, EDS, FT-IR and XPS. zeolite X with high crystallinity and rich hydroxyl/carboxyl groups was successfully synthesized by the AFH method, and its specific surface area was as high as 623.4 m2·g-1. When the adsorption time (t) is 720 min, the adsorption temperature (T) is 30 ℃, the initial uranium (VI) concentration is (C0) 35 mg/L, pH is 6.0, and the adsorbent dosage (m) is 5/35 mg/mL, the equilibriu adsorption capacity of zeolite X for uranyl ions is 228.4 mg·g-1. Thermodynamic results show that the adsorption process of uranyl ions by zeolite X is spontaneous and exothermic. Freundlich isotherms and quasi-second-order models are suitable to describe the adsorption process of uranyl ions by zeolite X. XPS analysis results show that -OH and -COOH play an important role in the adsorption process. At the same time, there is ion exchange between UO22+ and zeolite during the adsorption process.

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Nitrogen and oxygen Co-doped porous carbon derived from yam waste for high-performance supercapacitors

RSC Advances ◽

10.1039/d1ra06154b ◽

2021 ◽

Vol 11 (53) ◽

pp. 33208-33218

Author(s):

Zhaojin Li ◽

Qian Liu ◽

Lizhi Sun ◽

Ning Li ◽

Xiaofeng Wang ◽

...

Keyword(s):

Electrochemical Performance ◽

Specific Surface ◽

Surface Area ◽

Specific Surface Area ◽

Porous Carbon ◽

High Performance ◽

High Specific Surface Area ◽

Raw Material ◽

Excellent Electrochemical Performance ◽

Co Doped

3D porous carbon with ultra-high specific surface area and excellent electrochemical performance is synthesized by a simple activation and carbonization process through adopting biomass yam waste as raw material.

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Electrospun flexible lignin/polyacrylonitrile-based carbon nanofiber and its application in electrode materials for supercapacitors

Textile Research Journal ◽

10.1177/00405175211037191 ◽

2021 ◽

pp. 004051752110371

Author(s):

Hong Wu ◽

Chengkun Liu ◽

Zhiwei Jiang ◽

Zhi Yang ◽

Xue Mao ◽

...

Keyword(s):

Specific Surface ◽

Surface Area ◽

Specific Surface Area ◽

Electrode Materials ◽

Carbon Nanofiber ◽

Electrochemical Impedance ◽

Nickel Foam ◽

Average Diameter ◽

Raw Material ◽

Equivalent Series Resistance

In this study, a lignin/polyacrylonitrile (PAN) composite nanofiber membrane is prepared by electrospinning and used as the precursor to prepare flexible carbon nanofibers (CNFs) through pre-oxidation and carbonization. The micromorphology, crystal structure, pore size distribution and specific surface area of the CNFs are characterized by field emission scanning electron microscopy, X-ray diffraction, Raman spectroscopy and specific surface adsorption analysis, respectively. The electrochemical properties of the CNF membrane are also investigated by cyclic voltammetry, galvanostatic charge–discharge and electrochemical impedance spectroscopy due to its potential application in binder-free electrode materials for supercapacitors. We successfully prepared flexible CNFs with an average diameter of about 539 nm and a specific surface area of 1053.78 m2/g when the mass ratio of lignin to PAN was 9:1 in a solution concentration of 28 wt%. The CNFs are loaded onto nickel foam to prepare the electrode materials for supercapacitors without a binder. When the current density is 0.5 A/g, the specific capacitance could be up to 201.27 F/g and the equivalent series resistance is only 0.57 Ω, which shows an excellent electrochemical performance. This study not only provides a theoretical basis for the high-value utilization of lignin and the preparation of flexible lignin/PAN-based CNFs, but also provides a new type of environmentally friendly raw material for the electrodes of supercapacitors and could be helpful to alleviate the energy crisis and environmental pollution.

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Simulated electrical conductivity response of clogging mechanisms for managed aquifer recharge

Geophysics ◽

10.1190/geo2013-0054.1 ◽

2014 ◽

Vol 79 (2) ◽

pp. D81-D89 ◽

Cited By ~ 2

Author(s):

A. Rowan Cockett ◽

Adam Pidlisecky

Keyword(s):

Electrical Conductivity ◽

Specific Surface ◽

Surface Area ◽

Specific Surface Area ◽

Film Growth ◽

Volume Fraction ◽

Pore Space ◽

Managed Aquifer Recharge ◽

Aquifer Recharge ◽

Conductive Film

Motivated by the need for improved understanding and monitoring of clogging during managed aquifer recharge, we use numerical experiments to evaluate the effect of three different clogging mechanisms on electrical conductivity (EC), porosity, specific surface area, and electrical tortuosity of a simulated sediment pack. The clogging experiments are designed to simulate effect of clogging due to: (a) addition of finer grains, (b) addition of nonconductive films, and (c) addition of conductive films. The simulations involved starting with a random grain pack of 43% porosity, and subsequently reducing the porosity as would occur during clogging. For each of the experiments, we compute the EC response, specific surface area, and electrical tortuosity across the range of porosities. The differences in EC response between (a) and (b) is minor, however, the sediment parameters measuring pore-space configuration show very different responses (i.e., specific surface area and tortuosity), indicating EC is limited in its sensitivity to specific pore configurations. The results from simulations (a) and (b) are well described by Archie’s equation. For the conductive film experiments (c), we explore the effect of film growth for four different surface conductivities ranging from [Formula: see text] to [Formula: see text]. These conductivities correspond to a range of 5–35 times more conductive than the pore fluid conductivity. The bulk EC signal for each of the films results in a distinct manifestation in terms of measured bulk EC. We fit the EC response of the conductive film experiments with a model based on volume fraction occupied by the film; although the model fit the observed results, we required a unique set of fitting parameters for each Film conductivity.

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