scholarly journals Adsorptive removal of antibiotics from water using peanut shells from agricultural waste

RSC Advances ◽  
2018 ◽  
Vol 8 (24) ◽  
pp. 13546-13555 ◽  
Author(s):  
Rui Li ◽  
Yuling Zhang ◽  
Wenlei Chu ◽  
Zaixing Chen ◽  
Jiali Wang
Keyword(s):  
Porous Structure ◽  
Pore Size ◽  
Surface Area ◽  
Agricultural Waste ◽  
Adsorptive Removal ◽  
Peanut Shells ◽  
Desorption Isotherms ◽  
Adsorption Desorption

The porous structure of the materials was determined using the surface area and pore size analyzer (JW-BK132F) by N2 adsorption–desorption isotherms at 77 K.

scholarly journals Synthesis and Characterization of Nanoporous Monetite Which Can Be Applicable for Drug Carrier

2012 ◽  
Vol 2012 ◽  
pp. 1-5 ◽  
Author(s):  
Esmael Salimi ◽  
Jafar Javadpour
Keyword(s):  
Surface Area ◽  
Cetyltrimethylammonium Bromide ◽  
Drug Carrier ◽  
Synthesis And Characterization ◽  
X Ray ◽  
Plate Shape ◽  
Desorption Isotherms ◽  
Adsorption Desorption

Wormhole-like mesostructured monetite was successfully synthesized using cetyltrimethylammonium bromide (C19H42BrN, CTAB), as a porosity agent. X-ray techniques and FTIR reveal that the crystalline grains consist of highly crystalline pure monetite phase. Monetite rods with diameter around 20–40 nm and length in the range of 50–200 nm were confirmed by FESEM and TEM. Based on N2adsorption-desorption isotherms investigation, surface area increased up to 31.5 m2/g due to the removal of surfactant after calcinations at 400°C. The results indicate that CTAB can not only affect monetite crystallization but also change particles morphology from plate shape to rod-like.

scholarly journals Structural Study of Microporous Xerogels Prepared by Polycondensation of Pyrogallol with Formaldehyde

2010 ◽  
Vol 6 (1) ◽  
pp. 878-883 ◽  
Author(s):  
Rebeh Moussaoui ◽  
Mongi Ben Mosbah ◽  
Younes Moussaoui ◽  
Elimame Elaloui
Keyword(s):  
Specific Surface ◽  
Aqueous Medium ◽  
Surface Area ◽  
Absorption Spectra ◽  
Structural Study ◽  
Perchloric Acid ◽  
Nitrogen Adsorption ◽  
Desorption Isotherms ◽  
Adsorption Desorption ◽  
Ftir Absorption Spectra

Microporous xerogels were prepared by polycondensation of pyrogallol with formaldehyde catalyzed by perchloric acid in aqueous medium. The samples were characterized by FTIR absorption spectra. The micro-porosity and the specific surface area are characterized by nitrogen adsorption - desorption isotherms. The obtained characteristics depend on the conditions of polycondensation.

Adsorptive removal of Rhodamine B from aqueous solution by nanoporous polydivinylbenzene

2017 ◽  
Vol 75 (7) ◽  
pp. 1651-1658 ◽  
Author(s):  
Hongyu Jia ◽  
Ningning Liu
Keyword(s):  
Rhodamine B ◽  
Adsorption Process ◽  
Order Model ◽  
N2 Adsorption ◽  
Adsorptive Removal ◽  
Langmuir Isotherm Model ◽  
Pseudo Second Order ◽  
Desorption Isotherms ◽  
Adsorption Desorption ◽  
Scanning Electron

Nanoporous polydivinylbenzene (PDVB) material has been successfully prepared via the copolymerization of divinylbenzene monomers. The nanoporous PDVB was characterized through N2 adsorption/desorption isotherms, Fourier transform infrared spectroscopy, scanning electron microscopy, and thermogravimetric analysis. The nanoporous PDVB as an adsorbent was applied for the removal of Rhodamine B (RhB). The adsorption behavior of PDVB for the removal of RhB showed that the isotherm data followed the Langmuir isotherm model and the kinetic adsorption obeyed the pseudo-second-order model. Thermodynamic parameters illustrated that the adsorption process was spontaneous and exothermic. Interestingly, the spent nanoporous PDVB has excellent regenerative performance through treating it with ethanol. These results revealed that PDVB might be an excellent adsorbent for the removal of RhB from wastewater.

TiO2-BASED COMPOSITE FILMS FOR THE PHOTODEGRADATION OF OXYTETRACYCLINE

2015 ◽  
Vol 22 (02) ◽  
pp. 1550024 ◽  
Author(s):  
HUI LI ◽  
LING-XIAO GUAN ◽  
JI-JUN FENG ◽  
FANG LI ◽  
MING-MING YAO
Keyword(s):  
Visible Light ◽  
Surface Area ◽  
Composite Films ◽  
Bet Surface Area ◽  
Pl Spectra ◽  
Desorption Isotherms ◽  
Safety Of Drinking Water ◽  
Adsorption Desorption ◽  
Co Doped ◽  
Scanning Electron

The spread of the antibiotic oxytetracycline (OTC) has been thought as a threat to the safety of drinking water. In this paper, the photocatalytic activity of the nanocrystalline Fe/Ca co-doped TiO 2- SiO 2 composite film for the degradation of OTC was studied. The films were characterized by field emission scanning electron microscopy (FE-SEM) equipped with energy-dispersive spectroscopy (EDS), N 2 adsorption/desorption isotherms, photoluminescence (PL) spectra, and UV-Vis diffraction reflectance absorption spectra (DRS). The FE-SEM results indicated that the Fe/Ca co-doped TiO 2- SiO 2 film was composed of smaller nanoparticles compared to pure TiO 2 or TiO 2- SiO 2 film. The BET surface area results showed that the specific surface area of the pure TiO 2, TiO 2- SiO 2 and Ca 2+/ Fe 3+ co-doped TiO 2- SiO 2 is 118.3 m2g-1, 294.3 m2g-1 and 393.7 m2g-1, respectively. The DRS and PL spectra revealed that the Fe/Ca co-doped TiO 2- SiO 2 film had strong visible light adsorption and diminished electrons/holes recombination. Experimental results showed that the Fe / Ca co-doped TiO 2- SiO 2 film is effective in the degradation of OTC under both UV and visible light irradiation.

Properties of active carbon with various particle shapes obtained in char-steam reaction Properties of active carbon with various particle shapes obtained in char-steam reaction

2012 ◽  
Vol 33 (3) ◽  
pp. 335-344 ◽  
Author(s):  
Bronisław Buczek
Keyword(s):  
Mechanical Properties ◽  
Porous Structure ◽  
Active Carbon ◽  
Nitrogen Adsorption ◽  
Steam Gasification ◽  
Active Carbons ◽  
Desorption Isotherms ◽  
Adsorption Desorption ◽  
Particle Shapes ◽  
Micropore Size

Abstract The porous structure of cylindrical and ring-shaped char material was developed by partial steam gasification. Micropore and mesopore structures of active carbons with various forms of burn-off were evaluated by nitrogen adsorption/desorption isotherms. Parameters of the Dubinin- Radushkevich equation were calculated as well as the micropore size distribution by the Horvath- Kawazoe method. The results of textural investigations showed that more uniform micropore structure and better mechanical properties were found for ring-shaped active carbons.

scholarly journals The Porosity of Carbon Materials as Estimated by Thermogravimetric Analysis

1994 ◽  
Vol 11 (2) ◽  
pp. 105-112 ◽  
Author(s):  
J. Goworek ◽  
W. Stefaniak ◽  
A. Swiatkowski
Keyword(s):  
Thermogravimetric Analysis ◽  
Pore Size ◽  
Thermal Desorption ◽  
Carbon Materials ◽  
Size Distributions ◽  
Active Carbons ◽  
Thermal Analyzer ◽  
Pore Size Distributions ◽  
Desorption Isotherms ◽  
Adsorption Desorption

The thermal desorption of benzene has been measured using a thermal analyzer. Pore size distributions of active carbons and carbon blacks have been determined on the basis of thermogravimetric curves using the Kelvin equation. Calculated distributions and total pore volumes have been compared with those derived from adsorption/desorption isotherms of nitrogen and benzene vapour.

scholarly journals Carbonization of Lignin Extracted from Liquid Waste of Coconut Coir Delignification

2020 ◽  
Vol 20 (4) ◽  
pp. 842
Author(s):  
Widiyastuti Widiyastuti ◽  
Mahardika Fahrudin Rois ◽  
Heru Setyawan ◽  
Siti Machmudah ◽  
Diky Anggoro
Keyword(s):  
Pore Size ◽  
Surface Area ◽  
Liquid Waste ◽  
Nitrogen Adsorption ◽  
Nitrogen Atmosphere ◽  
Precipitation Method ◽  
X Ray Diffraction ◽  
Coconut Coir ◽  
Xrd Patterns ◽  
Adsorption Desorption

Lignin as a by-product of the pulping process is less widely used for worth materials. In this study, the utilization of lignin by-product of the soda delignification process of coconut coir converted to the activated carbon by a simple precipitation method followed by the carbonization at various temperatures is presented. The by-product liquor of the soda delignification process having a pH of 13.4 was neutralized by dropping of hydrochloric acid solution to achieve the pH solution of 4 resulting in the lignin precipitation. The precipitated was washed, filtered, and dried. The dried lignin was then carbonized under a nitrogen atmosphere at various temperatures of 500, 700, and 900 °C. The dried lignin and carbonized samples were characterized using SEM, XRD, FTIR, and nitrogen adsorption-desorption analyzer, to examine their morphology, X-Ray diffraction pattern, chemical bonding interaction, and surface area-pore size distribution, respectively. The characterization results showed that the functional groups of lignin mostly disappeared gradually with the increase of temperature approached the graphite spectrum. The XRD patterns confirmed that the carbonized lignin particles were amorphous and assigned as graphitic. All samples had a pore size of 3–4 nm classified as mesoporous particles. This study has shown that the carbonization lignin at a temperature of 700 °C had the highest surface area (i.e. 642.5 m2/g) in which corresponds to the highest specific capacitance (i.e. 28.84 F/g).

A Convenient Strategy to Control the Specific Surface Area of the Mesoporous Silica by Using the Poly(pseudo)rotaxanes Template

2012 ◽  
Vol 602-604 ◽  
pp. 1685-1688
Author(s):  
Lei Zu ◽  
Yu Yuan Zhi ◽  
Kai Gu ◽  
Hui Qin Lian ◽  
Xiu Guo Cui
Keyword(s):  
Mesoporous Silica ◽  
Specific Surface ◽  
Pore Size ◽  
Surface Area ◽  
Specific Surface Area ◽  
Fourier Transformation ◽  
Silica Particle ◽  
N2 Adsorption ◽  
Adsorption Desorption ◽  
Mesoporous Silica Particle

The poly(pseudo)rotaxanes formed by β-CD and F127 was used as the template to prepare the mesoporous silica. The specific surface area, pore size distribution and pore volume of the mesoporous silica could be controlled by simply changing the poly(pseudo)rotaxanes forming time. A series of samples with different template forming time were prepared to investigate the various specific surface area and pore size of the mesoporous silica. The morphology, composition, specific surface area and pore size of the mesoporous silica particle were investigated by the scanning electron microscopy, Fourier transformation infrared spectroscope, and N2 adsorption–desorption measurement.

Influence of Synthesis Condition on N2 Adsorption Characteristics of Anatase TiO2 Particles Prepared in an Aqueous Solution

2008 ◽  
Vol 388 ◽  
pp. 103-106
Author(s):  
Yoshitake Masuda ◽  
Kazumi Kato
Keyword(s):  
Aqueous Solution ◽  
Specific Surface ◽  
Surface Area ◽  
Specific Surface Area ◽  
Anatase Tio2 ◽  
N2 Adsorption ◽  
Tio2 Particles ◽  
Bet Specific Surface Area ◽  
Desorption Isotherms ◽  
Adsorption Desorption

TiO2 was crystallized to form particles in aqueous solutions containing ammonium hexafluorotitanate and boric acid. XRD diffraction patterns indicated they were in a single phase of anatase TiO2. TiO2 particles prepared at 90 °C exhibited N2 adsorption-desorption isotherms of type IV. BET specific surface area of the particles was estimated to 13 m2/g. On the other hand, TiO2 particles prepared at 50 °C exhibited N2 adsorption-desorption isotherms of type I. BET specific surface area of the particles was estimated to 168 m2/g. Crystal growth of TiO2 was strongly affected by synthesis temperature. Nano-sized pores or surface structure of TiO2 particles prepared at 50 °C would increase N2 adsorption volume to realize high BET specific surface area. Additionally, aqueous solution process described here had an advantage that TiO2 crystallized at ambient temperature. Anatase TiO2 was prepared without annealing at high temperature which caused aggregation of particles and disappearance of surface nanostructures. The particles with large surface area can be thus utilized for catalyst, cosmetic, photocatalyst, dye-sensitized solar cell or sensors.

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