scholarly journals Adsorption of organic reagents by natural bentonites modified with aluminum and iron (III) polyhydroxocations

2021 ◽  
Vol 21 (1) ◽  
pp. 23-30
Author(s):  
Natalya V. Nikitina ◽  
◽  
Anna P. Lamikhova ◽  
Nadezhda V. Nikitina ◽  
Ivan A. Kazarinov ◽  
...  
Keyword(s):  
Ir Spectroscopy ◽  
Specific Surface ◽  
Elemental Composition ◽  
Surface Area ◽  
Structural Properties ◽  
Organic Dyes ◽  
Sorption Process ◽  
Organic Reagents ◽  
Maximum Sorption ◽  
Modified Sorbents

The effective nanostructured sorbents based on natural bentonite modified with aluminum and iron (III) polyhydroxocations were obtained. The elemental composition of the obtained sorbents was studied. The specific surface area was determined for the studied samples. It was shown that modified sorbents based on natural bentonite were nanostructured objects. IR spectroscopy showed that modification of natural bentonite led to the changes in its structural properties. While studying the sorption process on modified sorbents, it was found that the modification of bentonite with aluminum and iron (III) compounds using the “codeposition” method led to the increase in the sorption capacity of the obtained sorbents. The sorption properties of the obtained sorbents were tested in relation to a number of organic dyes of the anionic and cationic types. It was established that the maximum sorption efficiency was achieved for extracting cationic substances from water, including organic dyes.

Facile method for the synthesis of Fe3O4@HCP core–shell porous magnetic microspheres for fast separation of organic dyes from aqueous solution

RSC Advances ◽  
2016 ◽  
Vol 6 (53) ◽  
pp. 47530-47535 ◽  
Author(s):  
Long Pan ◽  
Meng-Ying Xu ◽  
Zi-Lu Liu ◽  
Bi-Bai Du ◽  
Kun-Hao Yang ◽  
...  
Keyword(s):  
Aqueous Solution ◽  
Specific Surface ◽  
Adsorption Capacity ◽  
Surface Area ◽  
Specific Surface Area ◽  
Organic Dyes ◽  
Magnetic Microspheres ◽  
Core Shell ◽  
Magnetic Microsphere ◽  
Fast Separation

A novel type of porous magnetic microsphere (Fe3O4@HCP) was firstly synthesized and possesses a high Brunauer–Emmett–Teller specific surface area and excellent adsorption capacity for organic dyes.

scholarly journals Titanium dioxide modified with manganese: physicochemical and photocatalytic properties

2021 ◽  
Vol 12 (2-2021) ◽  
pp. 214-218
Author(s):  
S. A. Safaryan ◽  
◽  
M. L. Belikov ◽  
V. A. Krysanova ◽  
◽  
...  
Keyword(s):  
Methylene Blue ◽  
Titanium Dioxide ◽  
Photocatalytic Activity ◽  
Phase Composition ◽  
Specific Surface ◽  
Surface Area ◽  
Specific Surface Area ◽  
Organic Dyes ◽  
Photocatalytic Properties

The article presents the results of the studies of the physicochemical and photocatalytic properties of titanium dioxide modified with manganese, by the example of decomposition of organic dyes — ferroin and methylene blue. The correlations between the specific surface area and phase composition of the composites with their photocatalytic activity are revealed.

Technology of obtaining nanocomposites for sorption purification of aqueous media

2021 ◽  
Vol 9 ◽  
pp. 68-78
Author(s):  
T. S. Kuznetsova ◽  
◽  
I. V. Burakova ◽  
T. V. Pasko ◽  
A. E. Burakov ◽  
...  
Keyword(s):  
Specific Surface ◽  
Surface Area ◽  
Sorption Capacity ◽  
Specific Surface Area ◽  
Freeze Drying ◽  
Organic Dyes ◽  
Aqueous Media ◽  
Porous Space ◽  
Supercritical Conditions ◽  
Composite Nanomaterial

The paper presents a technique for obtaining a universal composite nanomaterial for effective sorption water purification from pollutants of various chemical nature. The proposed material is a nanocomposite based on reduced graphene oxide modified with a functional organic component — polyaniline, which also includes oxidized carbon nanotubes as a structure former. The use of polyaniline makes it possible to significantly increase the activity and sorption capacity of the developed graphene material. The authors were developed a number of nanocomposites, which differ in the final stage of the pre-prepared hydrogel technology: drying in air (drying oven), freeze drying, drying under supercritical conditions (supercritical fluid — isopropyl alcohol). In addition, the effect of carbonization as an additional stage (T = 800 °C, argon) was studied in the article. The materials surface morphology was evaluated using scanning electron microscopy. The specific surface area and the parameters of the porous space were determined by nitrogen adsorption. The materials specific surface area increases depending on the choice of drying technology for the initial hydrogel (drying oven — 80 m2/g → freeze drying — 180 m2/g → supercritical drying — 290 m2/g), and also increases after the carbonization stage and reaches a value of ~ 350 m2/g. The nanocomposites sorption capacity to the organic dyes (methylene blue (MB) and solar yellow (SY)), as well as to heavy metals (for example, zinc ions) was determined. It was found that the value of MB sorption is up 1380 to 1800 mg/g, for SY — up 159 to 300 mg/g, for zinc — up 31 to 230 mg/g. At the same time, the sample processed under supercritical conditions, followed by carbonization, were shown the best characteristics.

scholarly journals Coconut-based activated carbon fibers for efficient adsorption of various organic dyes

RSC Advances ◽  
2018 ◽  
Vol 8 (74) ◽  
pp. 42280-42291 ◽  
Author(s):  
Ling Zhang ◽  
Ling-yu Tu ◽  
Yan Liang ◽  
Qi Chen ◽  
Ze-sheng Li ◽  
...  
Keyword(s):  
Activated Carbon ◽  
Specific Surface ◽  
Surface Area ◽  
Specific Surface Area ◽  
Carbon Fibers ◽  
Organic Dyes ◽  
Low Cost ◽  
Micropore Volume ◽  
Activated Carbon Fibers ◽  
Large Specific Surface Area

Activated carbon fibers with high micropore volume and large specific surface area were prepared from abundant and low-cost coconut fibers, which show excellent adsorption performances towards various dyes.

scholarly journals Influence of Alkali and Acidic Treatment on Sorption Properties of Latvian Illite Clays

2014 ◽  
Vol 604 ◽  
pp. 71-74 ◽  
Author(s):  
Vitalijs Lakevičs ◽  
Valentīna Stepanova ◽  
Ieva Skuja ◽  
Inga Dušenkova ◽  
Augusts Ruplis
Keyword(s):  
Hydrochloric Acid ◽  
Specific Surface ◽  
Sodium Hydroxide ◽  
Surface Area ◽  
Specific Surface Area ◽  
Organic Dyes ◽  
Natural Clay ◽  
Adsorption Ability ◽  
Bet Specific Surface Area ◽  
Sorption Characteristics

The adsorption of monovalent organic cationic dye, methylene blue, on the natural and modified with hydrochloric acid and sodium hydroxide Latvian clay samples from water solutions has been studied. It was established, that alkali and acidic treatment of Latvian clay samples changes their sorption characteristics. It was found that increasing concentration of hydrochloric acid from 5 mass % until 15 mass %, decreases adsorption of clay samples proportionally to the acid concentration. Increasing concentration of sodium hydroxide from 5 mass % to 15 mass %, BET specific surface area of the modified clay samples is lower than BET specific surface area of the natural clay sample. The studies have proven that adsorption ability of Latvian clays is sufficient for using them in waste water purification from admixtures of organic dyes.

Cell Growth on TiAlNb Alloy as a Function of Bioactivation Method

2007 ◽  
Vol 361-363 ◽  
pp. 1131-1134 ◽  
Author(s):  
M.M. Sovar ◽  
E. Aldea ◽  
V. Mitran ◽  
Florin Miculescu ◽  
Ioana Demetrescu
Keyword(s):  
Particle Size ◽  
Cell Growth ◽  
Specific Surface ◽  
Surface Area ◽  
Structural Properties ◽  
Dental Implant ◽  
Specific Surface Area ◽  
Surface Treatments

This paper it supposed to demonstrate how to obtain the hydroxylapatite on the surface of TiAlNb biomaterial used as dental implant. The bone-forming bioactivity of TiAlNb is associated with its chemical and structural properties, including composition, porosity, specific surface area and particle size. After different bioactivation surface treatments as chemical and electrochemical treatments, it was observed a better stability for the TiAlNb alloy that was treated electrochemically.

Selective adsorption of organic dyes by porous hydrophilic silica aerogels from aqueous system

2018 ◽  
Vol 78 (2) ◽  
pp. 402-414 ◽  
Author(s):  
Wei Wei ◽  
Huihui Hu ◽  
Xuelin Ji ◽  
Zaoxue Yan ◽  
Wei Sun ◽  
...  
Keyword(s):  
Particle Size ◽  
Specific Surface ◽  
Size Distribution ◽  
Surface Area ◽  
Specific Surface Area ◽  
Silica Aerogel ◽  
Organic Dyes ◽  
Removal Rate ◽  
Cationic Dyes ◽  
Average Particle

Abstract Hydrophilic silica aerogel (HSA) was obtained by sol-gel method and dried at ambient conditions and further studied for the removal of organic dyes in water. Silica aerogel was characterized by its morphology, porous structure, specific surface area and particle size distribution by scanning electron microscopy, Brunauer–Emmett–Teller and pore size distribution. The HSA after calcination had a specific surface area of 888.73 m2/g and an average particle size of 2.6341 nm. Moreover, adsorption properties of the HSA toward organic dyes – adsorption conditions, kinetics data, and equilibrium model – were investigated. The removal rate of cationic dyes (rhodamine B (RhB), methylene blue (MB) and crystal violet (CV)) by HSA was up to 90%, while the removal rate of anionic dye (acid orange 7) was not more than 30%. The maximum adsorptions were: RhB 191.217 mg/g, MB 51.1601 mg/g and CV 24.85915 mg/g, respectively. Based on the adsorption mechanism of HSA for cationic/anionic dyes, the conclusion confirmed the prospect of HSA as effective adsorbent to treat cationic dyes wastewater.

scholarly journals Nitrogen doped hierarchically structured porous carbon fibers with an ultrahigh specific surface area for removal of organic dyes

RSC Advances ◽  
2018 ◽  
Vol 8 (34) ◽  
pp. 19116-19124 ◽  
Author(s):  
Zhigao Zhu ◽  
Jiaxiang Ma ◽  
Chenghan Ji ◽  
Yan Liu ◽  
Wei Wang ◽  
...  
Keyword(s):  
Specific Surface ◽  
Catalytic Oxidation ◽  
Surface Area ◽  
Organic Pollutants ◽  
Specific Surface Area ◽  
Carbon Fibers ◽  
Porous Carbon ◽  
Organic Dyes ◽  
Nitrogen Doped

Active porous carbon fibers with an ultrahigh specific surface area for the synergistic removal of organic pollutants via adsorption and catalytic oxidation.

Sign in / Sign up

Export Citation Format

Share Document