Investigation of coagulation and electrokinetic behaviors of clinoptilolite suspension with multivalent cations

Özkan, A.; Şener, Ayşe Gül; Ucbeyiay, H.

doi:10.1080/01496395.2017.1380669

Cited by 17 publications

(6 citation statements)

References 27 publications

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“…The zeta potential of zeolites is significantly affected by the pH of the solution in which the particles of these aluminosilicates are [ [53] , [54] , [55] , [56] ]. Therefore, the change in pH in the solution will affect the efficiency of ion exchange of zeolites, which is largely related to electrostatic forces.…”

Section: Resultsmentioning

confidence: 99%

“…This indicates that both forms of clinoptilolite are capable of sorbing cationic forms of metals from solutions of different acidity. The negative charge of clinoptilolite is the result of the isomorphous substitution of Si 4+ by Al 3+ in the lattice [ [53] , [54] , [55] ]. The increase in the negative charge with increasing pH is a consequence of the dissociation of surface silanol groups.…”

Section: Resultsmentioning

confidence: 99%

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Neodymium sorption on the Na-form of Transcarpathian clinoptilolite

Słota,

Vasylechko,

Yaremko

et al. 2023

Heliyon

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Neodymium sorption on the Na-form of Transcarpathian clinoptilolite

Słota,

Vasylechko,

Yaremko

et al. 2023

Heliyon

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“…The quality of industrial effluents has received increased attention due to the concern with environmental impacts in the industrial sector. In this context, an efficient collection and treatment system becomes necessary, as incorrect disposal of water has the potential to cause a series of liabilities to the environment [6,[64][65][66][67][68][69][70][71]. Besides, there is great pressure from environmental policies for the reuse of effluent, to reduce the intake of new water and preserve natural resources [72].…”

Section: Application Of Zeolites In Wastewater Treatmentmentioning

confidence: 99%

Zeolite Application in Wastewater Treatment

Magalhães

Silva

Peres

2022

Adsorption Science & Technology

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As a scarce natural resource, the preservation of water quality is of fundamental importance to guarantee its availability for future generations. Due to the increasing industrial activity, effluents are generated with a series of chemical compounds, such as nitrogenous, phosphoric, and organic compounds, heavy metals, and dyes which, if improperly disposed of, contribute to contamination, followed by significant environmental impacts, in addition to the damage to human health. The adsorption technique is an effective approach for removing contaminants from effluents, showing high versatility, due to the use of various materials as adsorbents. Belonging to a wide variety of materials, zeolites reveal to be a promising adsorbent. Zeolites are minerals found in nature or which can be synthesized from industrial residues, standing out in the treatment of contaminated effluents. Zeolite removal efficiency depends on the contaminant to be removed and can reach up to 96% for heavy metals, 90% for phosphoric compounds, 96% for dyes, 80% for nitrogen compounds, and 89% for organics. Aiming at the identification of the more relevant findings and research gaps to advance the use of zeolites in the large-scale treatment of industrial effluents, a review on the recent application of zeolites is needed. This paper presents a global view of zeolites, and a review is conducted on several recent studies using zeolites as adsorbents for the contaminants considered, indicating the main characteristics of the various adsorption systems, demonstrating the particularities of each process, and aiming to reveal useful information to provide future research, in addition to identifying points that need further investigation.

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“…The sokyrnite had a rough surface and the size of the crushed stone ranged from 1 to 10 mm. The density of sokyrnites is 2,2-2,3 g/cm 3 and a hardness on the Mohs scale of 3,5-4 points. The specific surface area is 50-65 m 2 /h.…”

mentioning

confidence: 97%

Kinetic Model of the Initial Stage of the Process of Colloid Retention by the Pore Space of Sokyrnite

Onanko,

Onanko

2023

LRaWM

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The physicochemical phenomena occurring on the surface of sokyrnite grains in complex system "medium grain surface - dispersion medium - surface of suspended particles" have been studied. The framework structure of the sokyrnite structure (rough surface, presence of pores and channels, entrance windows) enables it to work as a "molecular sieve" and to be a highly efficient sorbent-ion exchanger. The porosity of the filter media was determined. Namely: the porosity of the media grains (also called the internal porosity) and the porosity of the intergranular space (media layer). The internal surface area, which is an important quality parameter for sokyrnite as a physical adsorbent, was determined. Several other properties associated with sokyrnite and retained colloidal particles, which affect the strength of the physical adsorption, were investigated. The relationships characterizing the parameters of the zeolite filter media layer were formulated and given. In these studies, the requirements for determining the filter charging time and the optimal technological and design parameters of the filter, according to the operating conditions at a specific water treatment facility, were considered. They determined the need for more detailed research and development of a kinetic model for the initial stage of filtering an aqueous suspension through a filter containing zeolite media. A differential material balance expression for the zeolite filter was formulated. Based on the developed kinetic model, comparative experiments on iron removal from underground natural waters using the above-mentioned filter material were planned and carried out. The mechanism of the distribution of iron ions in the filter space due to the phenomenon of diffusion, in accordance with Fick's first law, is given. The mechanism of iron flake retention by the zeolite media pore space, the consolidation of which occurs during the transition of iron from a divalent to trivalent form, is described. The factors that interfere with autocatalytic processes in iron sediments were described. The dynamics of changes in the concentration of iron in the filtrate after the end of the ion-exchange resource of sokyrnite were studied.

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Investigation of coagulation and electrokinetic behaviors of clinoptilolite suspension with multivalent cations

Cited by 17 publications

References 27 publications

Neodymium sorption on the Na-form of Transcarpathian clinoptilolite

Neodymium sorption on the Na-form of Transcarpathian clinoptilolite

Zeolite Application in Wastewater Treatment

Kinetic Model of the Initial Stage of the Process of Colloid Retention by the Pore Space of Sokyrnite

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