scholarly journals Synthesis of Zeolitic Material with High Cation Exchange Capacity from Paper Sludge Ash Using EDTA

2021 ◽  
Vol 11 (23) ◽  
pp. 11231
Author(s):  
Takaaki Wajima
Keyword(s):  
Cation Exchange ◽  
Cation Exchange Capacity ◽  
Ethylenediaminetetraacetic Acid ◽  
Exchange Capacity ◽  
Paper Sludge ◽  
Zeolite Synthesis ◽  
Zeolite A ◽  
Paper Sludge Ash ◽  
Sludge Ash ◽  
High Cation Exchange Capacity

Paper sludge ash (PSA) typically has a low Si abundance and significant Ca content because of the presence of calcite fillers, which interfere with the zeolitic conversion of PSA. Ca-masking with ethylenediaminetetraacetic acid (EDTA) was used to reduce Ca interference during zeolite synthesis so that a zeolitic product with a high cation exchange capacity (CEC) could be synthesized. Hydroxysodalite, zeolite-P, hydroxycancrinite, tobermorite, and zeolite-A can be synthesized from PSA by an alkali reaction with EDTA. With the addition of EDTA, calcium ions in the solution were trapped by chelation, and the number of zeolitic crystals with low Si/Al (Si/Al = 1), zeolite-A, increased owing to the promotion of the synthesis reaction. A product with a high CEC that has a high zeolite-A content was obtained. The chelating agent can inhibit Ca interference for zeolite synthesis by Ca-masking, and a product with a high zeolite-A content can be obtained from PSA using EDTA.

scholarly journals Effects of Step-Wise Acid Leaching with HCl on Synthesis of Zeolitic Materials from Paper Sludge Ash

Minerals ◽  
2020 ◽  
Vol 10 (5) ◽  
pp. 402
Author(s):  
Takaaki Wajima
Keyword(s):  
Cation Exchange ◽  
Acid Leaching ◽  
Paper Sludge ◽  
Acid Solutions ◽  
Naoh Solution ◽  
Paper Sludge Ash ◽  
Sludge Ash ◽  
Zeolitic Materials

Incinerated ash with a relatively high Ca content, paper sludge ash, was converted to zeolitic materials with high cation-exchange capacities (CECs) by aging at 80 °C in NaOH solution via step-wise acid leaching with HCl to reduce the ash Ca content. The extraction of Ca, Mg, Si, and Al from the ash into the acid solutions during leaching and the products obtained from the leached ash by reaction with an alkali were examined. The contents of Ca and Mg in the ash were more easily extracted from the ash than those of Si and Al in the initial leaching. The leachant pH decreased with increasing numbers of leaching steps, and the amounts of Si, Al, and Ca extracted from the ash increased as a result of the dissolution of gehlenite (Ca2Al2SiO7), one of the main minerals in the ash. Zeolites A and P were synthesized from the leached ashes, and hydroxysodalite was synthesized from the raw ash. With increasing numbers of leaching steps of the ash, the obtained product contained lower released Ca, whereas the product contained higher released Na and has higher CEC, depending on the zeolite phases in the product. The product with the highest CEC was synthesized from third-leached ash, and its CEC was 1.5 mmol/g, which is about four times higher than that of the raw ash (0.4 mmol/g).

Ionic composition of a disordered kaolinite

Clay Minerals ◽  
1966 ◽  
Vol 6 (4) ◽  
pp. 341-344 ◽  
Author(s):  
W. E. Worrall ◽  
A. E. Cooper
Keyword(s):  
Cation Exchange ◽  
Clay Mineral ◽  
Cation Exchange Capacity ◽  
Ionic Composition ◽  
Exchange Capacity ◽  
Plastic Clay ◽  
High Cation Exchange Capacity

AbstractA white-burning, highly-plastic clay from Jamaica, containing mainly disordered kaolinite, was examined recently. It was unusual in that it was practically free from fine mica, and therefore could be purified readily by standard sedimentation techniques.The cation exchange capacity was abnormally high, and the purified clay mineral, on analysis and calculation of the ionic composition, was found to be deficient in aluminium, but contained magnesium and iron.The results confirmed the view, previously expressed, that disorder in kaolinites is associated with a high cation exchange capacity and a substituted lattice.

scholarly journals Biochar Surface Oxygenation by Ozonization for Super High Cation Exchange Capacity

2019 ◽  
Vol 7 (19) ◽  
pp. 16410-16418 ◽  
Author(s):  
Gyanendra Kharel ◽  
Oumar Sacko ◽  
Xu Feng ◽  
John R. Morris ◽  
Claire L. Phillips ◽  
...  
Keyword(s):  
Cation Exchange ◽  
Cation Exchange Capacity ◽  
Exchange Capacity ◽  
High Cation Exchange Capacity

Zeolite synthesis from paper sludge ash at low temperature (90°C) with addition of diatomite

2006 ◽  
Vol 132 (2-3) ◽  
pp. 244-252 ◽  
Author(s):  
T WAJIMA ◽  
M HAGA ◽  
K KUZAWA ◽  
H ISHIMOTO ◽  
O TAMADA ◽  
...  
Keyword(s):  
Low Temperature ◽  
Paper Sludge ◽  
Zeolite Synthesis ◽  
Paper Sludge Ash ◽  
Sludge Ash

scholarly journals Cd2+Exchange for Na+and K+in the Interlayer of Montmorillonite: Experiment and Molecular Simulation

2015 ◽  
Vol 2015 ◽  
pp. 1-9 ◽  
Author(s):  
Lefu Mei ◽  
Huashang Tao ◽  
Chao He ◽  
Xuebing Xin ◽  
Libing Liao ◽  
...  
Keyword(s):  
Cation Exchange ◽  
Cation Exchange Capacity ◽  
Interlayer Space ◽  
Molecular Simulations ◽  
Exchange Interactions ◽  
Exchange Capacity ◽  
Molecular Dynamic Simulations ◽  
Dynamic Simulations ◽  
Cation Exchange Reaction ◽  
High Cation Exchange Capacity

Montmorillonite (Mt) has high cation exchange capacity and thus has been studied extensively for its cation exchange interactions with other cations. However, molecular simulations for the forces governing the cation exchange on Mt surfaces or in the interlayer spaces were limited. In this study, Mt with K+and Na+in the interlayer spaces was tested for its cation exchange with Cd2+in solution and the forces driving the cation exchange reaction were simulated by molecular simulations. The experimental results showed that Na+in Na + Mt was completely exchanged by Cd2+, while only 50% of K+in K + Mt was exchanged by Cd2+. A largerd-value was noticed for Na + Mt in comparison to K + Mt, suggesting that the interlayer space is more hydrated with Na+as the interlayer space cation. Molecular dynamic simulations revealed a larger energy decrease when Cd2+substitutes K+. However, the nice fit of the K+into the 12-coordinated interlayer space sites may restrict its hydration and thus reduce its interlayer space cation exchange capability by Cd2+.

Synthesis of Zeolite A from Mongolian Coal Fly Ash by Hydrothermal Treatment

2018 ◽  
Vol 271 ◽  
pp. 1-8 ◽  
Author(s):  
Ulambayar Rentsenorov ◽  
Batmunkh Davaabal ◽  
Jadambaa Temuujin
Keyword(s):  
Fly Ash ◽  
Hydrothermal Treatment ◽  
Cation Exchange Capacity ◽  
Coal Fly Ash ◽  
Batch Composition ◽  
Exchange Capacity ◽  
Zeolite Synthesis ◽  
Zeolite A ◽  
Acid Pretreatment ◽  
Type Zeolite

Raw coal fly ash and acid pretreated fly ash were used to synthesize A-type zeolite by hydrothermal treatment. In order to synthesize zeolite A an aqueous gel having a molar batch composition of Na2O:Al2O3:1.926SiO2:128H2O was utilized. Fly ash and zeolitic products were characterized by SEM, XRF, XRD and cation exchange capacity (CEC). After hydrothermal treatment, several types of zeolites were formed: zeolite A, analcime, faujasite and hydroxy-sodalite. The highest content of zeolite A was formed in the mixture treated at 80°C for 8 hours. CEC values of the zeolitic products were 28-38 times higher than that of in raw fly ash. Acid pretreatment which leads to low calcium and iron content is preferable method for processing of fly ash for the zeolite synthesis. Synthesized zeolite can be used for ion exchangers for water treatment.

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