Cation Exchange Properties of Hydrothermally Treated Coal Fly Ash

Singer, Arieh; Berkgaut, Vadim

doi:10.1021/es00007a009

Cited by 177 publications

(87 citation statements)

References 11 publications

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“…[13][14][15][16][17][18][19][20][21][22][23] Yields for CFA direct conversion (one step synthesis process) into zeolites can vary from 50 to 75%. 24 Applications for zeolites synthesized using CFA are the same as those of natural zeolites and zeolites made from natural materials (kaolin, diatomites) or other aluminosilicate industrial wastes. [25][26][27][28] Both natural zeolites and those directly synthesized (one step or one-pot process) 29,30 from less pure materials limit their possible uses to (i) removing metals from industrial wastewater; [31][32][33] (ii) acid mine drainage.…”

Section: Introductionmentioning

confidence: 99%

Integrated Synthesis of Zeolites Using Coal Fly Ash: Element Distribution in the Products, Washing Waters and Effluent

Ferrarini¹,

Cardoso²,

Paprocki³

et al. 2016

Journal of the Brazilian Chemical Society

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Coal fly ash has been proposed as an alternative raw material for zeolite synthesis, however, the mobilization of toxic elements of this material into zeolite products, washing water and effluent is rarely addressed. In this study, Brazilian coal fly ash was used in the integrated synthesis (two steps) of zeolites Na-P1 and 4A and the distribution of approximately 40 major, minor and trace elements was investigated in all the input and output flows involved in the process. The mobilization of several elements was observed in the zeolite products, a number of which are highly toxic, such as As, Cd, Cr, Ni and Pb. With regard to the amount present in the ash, both zeolites were enriched in several elements, such as Ni in zeolite Na-P1 and As in zeolite 4A. The latter exhibited high purity, with most of the elements investigated having concentrations close to those measured in commercial zeolite 4A. Important information was gathered regarding zeolite synthesis using fly ash, which will ensure safer application of these materials and, if necessary, propose a contaminant-free synthesis route.

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Section: Introductionmentioning

confidence: 99%

Integrated Synthesis of Zeolites Using Coal Fly Ash: Element Distribution in the Products, Washing Waters and Effluent

Ferrarini¹,

Cardoso²,

Paprocki³

et al. 2016

Journal of the Brazilian Chemical Society

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“…Synthesis of zeolites from coal fly ash is one of the promising applications of fly ashes with high added value [9]. Since the initial studies of zeolite synthesis from fly ash by Höller and Wirsching (1985) [10], various methods and patents have been proposed, improved and applied by many authors to synthesize different types of zeolites , among which direct conversion is a common synthesis method [19,[22][23][24][25]. Due to the peculiar structural properties of zeolites, they have a wide range of industrial applications, such as ion exchange, and gas and water adsorption, among others [35,36].…”

Section: Introductionmentioning

confidence: 99%

Synthesis of merlinoite from Chinese coal fly ashes and its potential utilization as slow release K-fertilizer

Zhuang

Font

et al. 2014

Journal of Hazardous Materials

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“…The size of the fly ash particles directly affects the adsorption performance of the strength of the strength. The finer the adsorbent particles, the larger the surface area , the larger the contact area of the sewage, the more favorable to the adsorption, the higher the removal rate [13,14] . In contrast, as shown in Figure 1, fly ash particle size of 200 meshes, have the best treatment effect of domestic sewage.…”

Section: Effect Of Fly Ash Particle Size On Treatment Effectmentioning

confidence: 99%

Research on Adsorbent Using Modified Fly Ash for Campus Domestic Sewage Treatment

Li¹,

Gan²,

Wang³

et al. 2016

MATEC Web Conf.

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Abstract. As a kind of extensive sources and low cost industrial waste, fly ash has many features, such as porosity, large surface area, adsorption capacity, chemical activity and weakly alkaline, which seem a wide prospect of application in wastewater treatment. This study proposed the acid modification test on fly ash. The effect of key factors including the particle size, pH, the dosage of fly ash, adsorption time and dosage of the modifier on domestic sewage removal efficiencies were evaluated. The optimum conditions and the corresponding removal efficiency were determined. The results show that the removal efficiency is increased firstly and steady subsequently with the increase of fly ash dosage, increased firstly and decreased subsequently with the increase of adsorption time, and increased firstly and decreased subsequently with the increase of pH value. The removal efficiency can up to 95.19% when 0.7 g fly ash added in 200 mL wastewater when the pH value was adjusted to 5 at the adsorption time of 20 min. And the best particle size of fly ash is 200 meshes, when used 2mol/L hydrochloride as modifier and soaked fly ash for 2h, and the ratio of hydrochloride and fly ash is 1mL / g, the effect is best. It also finds obviously that fly ash can have a better effect on removal efficiency than raw fly ash.

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Cation Exchange Properties of Hydrothermally Treated Coal Fly Ash

Cited by 177 publications

References 11 publications

Integrated Synthesis of Zeolites Using Coal Fly Ash: Element Distribution in the Products, Washing Waters and Effluent

Integrated Synthesis of Zeolites Using Coal Fly Ash: Element Distribution in the Products, Washing Waters and Effluent

Synthesis of merlinoite from Chinese coal fly ashes and its potential utilization as slow release K-fertilizer

Research on Adsorbent Using Modified Fly Ash for Campus Domestic Sewage Treatment

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