Zeolites featuring 14×12-Ring Channels with Unique Adsorption Properties

2021 ◽  
Author(s):  
Peng Wu ◽  
Shiqing Li ◽  
Lu Han ◽  
Zhonglin Zhao ◽  
Hao Xu ◽  
...  
Keyword(s):  
Acid Treatment ◽  
Adsorption Properties ◽  
Silylating Agent

The lamellar precursor PREFER was applied to develop interlayer expanded zeolite IEZ-FER(D4h) with extra-large pores through hydrothermal acid treatment-assisted molecular alkoxysilylation using 1,3,5,7-tetramethyl cyclo tetrasiloxane (D4h) as a silylating agent...

Effects of Acid and Heat Treatments on the Structure of Sepiolite and its Adsorption of Tannin

2012 ◽  
Vol 518-523 ◽  
pp. 728-731
Author(s):  
Cheng Yuan Su ◽  
Wei Guang Li ◽  
Meng Lin Chen
Keyword(s):  
Fourier Transform ◽  
Adsorption Capacity ◽  
Acid Concentration ◽  
Acid Treatment ◽  
Treatment Time ◽  
Heat Treatments ◽  
Adsorption Properties ◽  
Removal Rates ◽  
Calcined Temperature ◽  
Acid Treatments

In this paper, it was investigated the changes of structure of sepiolites under different conditions of acid treatments and heat treatments using fourier transform infrared spectroscopy(FTIR). At the same time, through the tannin adsorption experiments, it was studied the changes adsorption properties of sepiolites by acid treatments and heat treatments. The H2SO4 treatment was found to be more effective for the removal of tannin than HCl and HNO3 treatments. With increasing the acid concentration and acid treatment time of H2SO4, the removal rates and adsorption capacity of tannin by sepiolites were first increased and then decreased. The removal rates and adsorption capacity were 61.0% and 23.7mg/g when the acid concentration was 4.0mol/l. And the removal rates and adsorption capacity were 62.5% and 24.3mg/g when the acid treatment time was 16 hours. The calcinations treatment exhibited significant effects on the adsorption of tannin. The removal rates and adsorption capacity were 77.9% and 30.8mg/g when the calcined temperature was 400°C. However, when the calcined temperature was 700°C, the removal rates and adsorption capacity were only 54.1% and 20.8mg/g.

scholarly journals Study of sepiolite from Goles (Kosovo, Yugoslavia). II. Acid activation

2002 ◽  
Vol 67 (7) ◽  
pp. 499-506 ◽  
Author(s):  
Marina Radojevic ◽  
Vidojko Jovic ◽  
Dragomir Karaulic ◽  
Dragomir Vitorovic
Keyword(s):  
Specific Surface ◽  
Chemical Treatment ◽  
Acid Treatment ◽  
Nitrogen Adsorption ◽  
Adsorption Properties ◽  
Acid Activation ◽  
Surface Areas ◽  
Bet Method ◽  
Specific Surface Areas ◽  
Enhanced Adsorption

The changes in the pore structure and adsorption properties of sepiolite from Goles resulting from treatment with 4MHCl for various periods of time were investigated. The BET method specific surface areas, pore volumes and f ? plots were determined by nitrogen adsorption. The surface area progressively increased during the 70 hours of acid treatment, when a maximum was attained. The differences in the adsorption properties of the original and the acid treated sepiolite were evaluated by comparison of adsorption isotherms obtained with benzene, n-hexane, methanol and isooctane. The enhanced adsorption of isooctane was of great interest, since the sorption of this compound on natural sepiolites is generally very limited. The results suggest that chemical treatment of sepiolite with 4MHCl for 70 h produces an adsorbent of optimal porosity and other adsorption properties.

Adsorption Properties Graphene-Based Composites on Lead(II) Ions

2021 ◽  
Vol 1036 ◽  
pp. 137-144
Author(s):  
Zhi Bo Sheng ◽  
Chen Kang Wang ◽  
Ling Zheng Wu ◽  
Wen Liang Jin ◽  
Shen You Song Jin
Keyword(s):  
Fourier Transform ◽  
Thermogravimetric Analysis ◽  
Infrared Spectrum ◽  
Adsorption Capacity ◽  
Functional Groups ◽  
Acid Treatment ◽  
Adsorption Process ◽  
Adsorption Properties ◽  
Ft Ir ◽  
Equilibrium Adsorption Capacity

The graphene-based composites was prepared by the oxidation of graphene nano-platelets. The characterization results of thermogravimetric analysis (TGA) and Fourier transform infrared spectrum (FT-IR) indicated that acid treatment can generate abundant functional groups on the surface of graphene. The determined equilibrium adsorption capacity of FGN for lead was 57.765 mg/g, which is higher than that of many currently reports. The adsorption process was completed within 40 min and the adsorption isotherms confirmed to Langmuir classical isotherms models.

Preparation of Ion-Sieve Type (H)[M0.5Mn1.5]O4 (M=Mg, Zn) and their Lithium Adsorption Properties in Seawater

2007 ◽  
Vol 124-126 ◽  
pp. 739-742 ◽  
Author(s):  
Kang Sup Chung ◽  
Mi Ae Kim ◽  
Hwan Lee ◽  
Yong Jae Suh ◽  
Dae Sup Kil ◽  
...  
Keyword(s):  
Solid State ◽  
Hydrochloric Acid ◽  
Acid Treatment ◽  
Selective Adsorption ◽  
Adsorption Properties ◽  
Artificial Seawater ◽  
Hydrochloric Acid Concentration ◽  
Adsorption Efficiency ◽  
Freundlich Equation ◽  
Oxide Spinels

Ion-sieve type manganese oxide spinels for the selective adsorption of lithium(Li) from seawater were prepared and their properties were examined. LiM0.5Mn1.5O4 (M=Mg, Zn) precursors, in which part of manganese(Mn) was substituted with magnesium(Mg) or zinc(Zn), were synthesized through the solid-state reaction. The adsorbents, HM0.5Mn1.5O4 (M=Mg, Zn) were derived from LiM0.5Mn1.5O4 (M=Mg, Zn) by acid treatment. The optimum acid treatment was obtained at hydrochloric acid concentration of 0.5M and 0.3M for LiMg0.5Mn1.5O4 and LiZn0.5Mn1.5O4 precursors, respectively. Both cases required thrice-conducted acid treatments for the best results. The adsorption of Li by HMg0.5Mn1.5O4 and HZn0.5Mn1.5O4 adsorbents followed the Freundlich equation and the maximum adsorption of Li in artificial seawater was 30.3 mg/g and 33.1 mg/g, respectively. The adsorption efficiency of Li by HMg0.5Mn1.5O4 and HZn0.5Mn1.5O4 adsorbents in artificial seawater, in which Li concentration was adjusted to 0.2 mg/L, was as high as 88% and 89%.

Synthesis of polypyrrole/Fe-kanemite nanocomposite through in situ polymerization: effect of iron exchange, acid treatment, and CO2 adsorption properties

2016 ◽  
Vol 52 (5) ◽  
pp. 2460-2472 ◽  
Author(s):  
Bouhadjar Boukoussa ◽  
Fatiha Abidallah ◽  
Zakaria Abid ◽  
Zoulikha Talha ◽  
Nafissa Taybi ◽  
...  
Keyword(s):  
Acid Treatment ◽  
Co2 Adsorption ◽  
In Situ Polymerization ◽  
Adsorption Properties ◽  
Iron Exchange

scholarly journals Adsorption of inorganic anionic contaminants on surfactant modified minerals

2003 ◽  
Vol 68 (11) ◽  
pp. 833-841 ◽  
Author(s):  
Aleksandra Vujakovic ◽  
Aleksandra Dakovic ◽  
Jovan Lemic ◽  
Ana Radosavljevic-Mihajlovic ◽  
Magdalena Tomasevic-Canovic
Keyword(s):  
Primary Amine ◽  
Acid Treatment ◽  
Diatomaceous Earth ◽  
Adsorption Properties ◽  
Second Step ◽  
Zeolite Surface ◽  
Anion Adsorption ◽  
Surface Active ◽  
Alkyl Ammonium ◽  
Efficient Adsorbent

Organo-mineral complexes were obtained by treatment of aluminosilicate minerals (zeolite, bentonite and diatomaceous earth) with a primary amine (oleylamine) and an alkyl ammonium salt (stearyldimethylbenzyl ammonium chloride). The modification of the zeolite surface was carried out in two steps. The first step was treatment of the zeolite with 2M HCl. This acid treatment of the zeolite increased its affinity for neutral molecules such as surface-active amines. The second step of the modification was the adsorption of oleylamine on the acid treated zeolite. Four types of organo-mineral complexes were prepared and their anion adsorption properties were compared to those of organo-zeolite. The adsorption of sulphate bichromate and dihydrogenphosphate anions on the organo-mineral complexes was investigated. The anion adsorption measurements showed that the most efficient adsorbent for anion water pollutants was the primary amine modified H+-form zeolite.

Fasciaton of Pectate Elementary Fibrils

1973 ◽  
Vol 31 ◽  
pp. 60-61
Author(s):  
George F. Leeper
Keyword(s):  
Acid Treatment ◽  
Carbon Film ◽  
Final Concentration ◽  
Cellulose Microfibrils ◽  
Pectic Acid ◽  
Elementary Fibrils

Polysaccharide elementary fibrils are usually fasciated into microfibrils of from one hundred to a few hundred Angstroms wide. Cellulose microfibrils when subjected to acid treatment dissociate into component elementary fibrils. For pectic acid it was observed that variations in pH could cause a change in the fasciation of the elementary fibrils.Solutions of purified pectic acid and sodium phosphotungtate were adjusted to various pH levels with NaOH or HCl and diluted to give a final concentration of 0.5 and 1% for the polysaccharide and negative stains respectively. Micrographs were made of the samples after drying on a carbon film covered grid. The average number of elementary fibrils was determined by counting the number of elementary fibrils in each fascicle intersected by lines drawn across the micrograph.

Does anti-acid treatment influence disease progression in SSc-ILD? Data form the German SSc-network

2020 ◽  
Author(s):  
M Kreuter ◽  
F Bonella ◽  
N Blank ◽  
E Siegert ◽  
J Henes ◽  
...  
Keyword(s):  
Disease Progression ◽  
Acid Treatment ◽  
Data Form

Effect of valproic acid treatment on body composition, leptin and soluble leptin receptor in epileptic children

2006 ◽  
Vol 37 (06) ◽  
Author(s):  
M Rauchenzauner ◽  
E Haberlandt ◽  
S Scholl-Bürgi ◽  
D Karall ◽  
E Schönherr ◽  
...  
Keyword(s):  
Valproic Acid ◽  
Body Composition ◽  
Acid Treatment ◽  
Leptin Receptor ◽  
Soluble Leptin Receptor ◽  
Epileptic Children
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