Quantitative arrangement of Si/Al ratio of natural zeolite using acid treatment

2019 ◽  
Vol 498 ◽  
pp. 143874 ◽  
Author(s):  
Cheng Wang ◽  
Shaozheng Leng ◽  
Huidong Guo ◽  
Jiale Yu ◽  
Wenjie Li ◽  
...  
Keyword(s):  
Natural Zeolite ◽  
Acid Treatment

scholarly journals Adsorption of N2, NO2 and CO2 on Epistilbite Natural Zeolite from Jalisco, Mexico after Acid Treatment

Minerals ◽  
2018 ◽  
Vol 8 (5) ◽  
pp. 196 ◽  
Author(s):  
Miguel Hernández-Espinosa ◽  
Karla Quiroz-Estrada ◽  
Vitalii Petranovskii ◽  
Fernando Rojas ◽  
Roberto Portillo ◽  
...  
Keyword(s):  
Natural Zeolite ◽  
Acid Treatment ◽  
Adsorption Of N2

scholarly journals Modification of Lampung and Bayah Natural Zeolite to Enhance the Efficiency of Removal of Ammonia from Wastewater

2019 ◽  
Vol 31 (4) ◽  
pp. 873-878
Author(s):  
Tiur Elysabeth ◽  
Zulnovri ◽  
Gina Ramayanti ◽  
Setiadi ◽  
Slamet
Keyword(s):  
Ion Exchange ◽  
Adsorption Capacity ◽  
Natural Zeolite ◽  
Acid Treatment ◽  
Performance Test ◽  
Hydroxyl Groups ◽  
Ammonia Adsorption ◽  
Modified Zeolite ◽  
X Ray ◽  
Modification Process

In this research, modification of Lampung and Bayah natural zeolites was carried out to increase the zeolite’s capacity as an ammonia adsorbent. Natural zeolite is modified by acid treatment using 6 M HCl and ion exchange using 1 M NH4NO3. The modification process continued with calcination at 500 °C for 4 h. X-ray fluorescence characterization shows changes in composition in the modified zeolites. The significant increase in the Si/Al ratio occurred in the modified zeolite with acid treatment that is 10.03 for Lampung natural zeolite HCl (LNZH) and 9.20 for Bayah natural zeolite HCl (BNZH). Surface area increases due to increasing Si/Al ratio. FTIR results indicate changes in the intensity of hydroxyl groups and pyrH+ as a result of the increase in total acidity of zeolites. The zeolites performance test proves that the Bayah natural zeolite has a higher ammonia adsorption capacity than Lampung natural zeolite. Ion exchange-modified zeolite has a higher ammonia adsorption capacity than zeolite modified with acid treatment.

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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