Application of IR spectra in the studies of zeolites from D4R and D6R structural groups

Król, Magdalena; Mozgawa, W.; Jastrzębski, Witold; Barczyk, K.

doi:10.1016/j.micromeso.2012.02.040

Cited by 133 publications

(56 citation statements)

References 24 publications

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“…Additionally, the safety, easy operation and maintenance, low treatment costs, high selectivity and the release of non-toxic exchangeable cations (K + , Na + , Ca 2+ and Mg 2+ ) make zeolites an attractive alternative [3,9,10]. Zeolite are hydrated crystalline aluminum-silicate materials with a framework structure where micro-and mesopores located by water and typically alkaline cations [11]. However, they have been rarely used for phosphate sorption due to the constant negative charge on their surface [12].…”

Section: Introductionmentioning

confidence: 99%

Simultaneous phosphate and ammonium removal from aqueous solution by a hydrated aluminum oxide modified natural zeolite

Guaya

Valderrama

Farrán

et al. 2015

Chemical Engineering Journal

263

106

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A natural zeolite (Z-N), rich in clinoptilolite, was modified (Z-Al) by incorporation of hydrated aluminum oxide (HAlO) for the simultaneous phosphate and ammonium removal. The incorporation of surface hydroxyl groups (≅Al-OH) into the zeolite structure, as active groups for phosphate removal, was characterized by acid-base titrations (pHPZC=4.5±0.2). The phosphate sorption increases from 0.6 mg-P/g for Z-N up to 7.0 mg-P/g while only a slight decrease on the ammonium sorption capacity from 33 mg-N/g of Z-N to 30 mg-N/g for Z-Al was observed. The HAlO modified zeolite sorption capacity for both phosphate and ammonium was slightly reduced by common ions typically present in secondary waste water effluents. Column experiments revealed higher enrichment factor for ammonium (120) than for phosphate (50) using 1 M NaOH as elution solution. A reduction of zeolite phosphate capacity with regeneration cycles was observed.

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Section: Introductionmentioning

confidence: 99%

Simultaneous phosphate and ammonium removal from aqueous solution by a hydrated aluminum oxide modified natural zeolite

Guaya

Valderrama

Farrán

et al. 2015

Chemical Engineering Journal

263

106

View full text Add to dashboard Cite

show abstract

“…5a) respectively for Na-and K-form of model cluster. These vibrations were not implemented within individual rings, but rather in whole unit, so-also with some approximation-can be considered that they are characteristic for PO vibration typical for such units as D4R or D6R [2]. The presence of ring-like vibrations in is can be also confirmed by analysis of the computed Raman spectra (Fig.…”

Section: Resultsmentioning

confidence: 86%

“…Selected cations were introduced into mordenite (MOR) and ferrierite (FER) structure from aqueous solutions of nitrates: 2 and Cr(NO 3 ) 3 Á9H 2 O (POCH) respectively. The starting concentration of the metals was in the range 1 9 10 -3 to 20 9 10 -3 mol/dm 3 .…”

Section: Methodsmentioning

confidence: 99%

“…Ion-exchange process leads to creation of new kind of bonds and small deformation of the initial zeolite structure, so it is possible to observe changes in the IR-spectra of zeolites which are result of heavy metal cations immobilization. Previous studies [2,3] showed that incorporation of cations into the zeolite structure results mainly in changes of the intensity of the bands associated with ring-opening (RO type) vibrations as well as modification of bands due to Me-O vibrations in FIR spectra (below 400 cm -1 ). Interpretation of infrared spectra of zeolites often is difficult and in such situations computational methods can be helpful.…”

Section: Introductionmentioning

confidence: 99%

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Theoretical and experimental study of ion-exchange process on zeolites from 5-1 structural group

2015

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“…Zeolites are hydrated crystalline aluminium -silicate materials that 14 include micro-and mesoporosity with alkaline cations and water in their framework structure. 15 Recently, zeolites have received increased attention in the field of agriculture because their physical 16 and chemical properties make them potentially suitable candidates for soil amendments and suitable 17 carriers of plant nutrients (Król et al, 2012). However, when zeolites are applied to recover NH4 + from 18 waste waters, the major drawback is their ability to be regenerated.…”

Section: Term 27mentioning

confidence: 99%

Valorisation of N and P from waste water by using natural reactive hybrid sorbents: Nutrients (N,P,K) release evaluation in amended soils by dynamic experiments

Guaya

Valderrama

Farrán

et al. 2018

Science of The Total Environment

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13The removal of nutrients (nitrogen (N), phosphorous (P)) from waste water has become a resource 14 recovery option in recent regulations worldwide, as observed in the European Union. Although both 15 of these nutrients could be recovered from the sludge line, more than 70-75% of the N and P is 16 discharged into the water line. Efforts to improve the nutrient recovery ratios have focused on 17 developing low-cost technologies that use sorption processes. In this study, a natural zeolite 18 (clinoptilolite type) in its potassium (K) form was impregnated with hydrated metal oxides and used to 19 prepare natural hybrid reactive sorbents (HRS) for the simultaneous recovery of ammonium (NH4 + ) 20 and phosphate (PO4 3-) from treated urban waste water. Three unfertile soils (e.g., one acidic and two 21 basic) amended with N-P-K charged HRS were leached with deionized water (e.g. to simulate 22 infiltration in the field) at two-and three-day time intervals over 15 different leaching cycles 23 (equivalent to 15 bed volumes). The N-P-K leaching profiles for the three charged hybrid sorbents 24 exhibited continuous nutrient release, with their values dependent on the composition of minerals in 25 the soils. In the basic soil that is rich in illite and calcite, the release of potassium (K + ) and ammonium 26 (NH4 + ) is favoured by-ion exchange with calcium (Ca 2+ ) and accordingly diminishes the release of 27 phosphate (PO4 3-) due to its limited solubility in saturated calcite solutions (pH 8 to 9). The opposite is 28 true for sandy soils that are rich in albite (both acidic and basic), whereas the release of NH4 + and K + 29 was limited and the values of both ions measured in the leaching solutions were below 1 mg/L. Their 30 leaching solutions were poor in Ca 2+ , and the release of PO4 3-was higher (up to 12 mg P-PO4 3-/L). 31 *Revised manuscript with no changes marked Click here to view linked References 2The nutrient releases necessary for plant growth were provided continuously and were controlled 1 primarily by the soil mineral dissolution rates fixing the soil aqueous solution composition (e.g. pH 2 and ionic composition; in particular, the presence of calcite is a determinant for nutrient release, 3 especially in alkaline soils). The N-P-K charged HRS sorbents that were used for soil amendment 4 may be an alternative for avoiding nutrient leaching and reaching the goals of soil sustainability in 5 agriculture and reducing the nutrient overloading of surface waters. 6

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Application of IR spectra in the studies of zeolites from D4R and D6R structural groups

Cited by 133 publications

References 24 publications

Simultaneous phosphate and ammonium removal from aqueous solution by a hydrated aluminum oxide modified natural zeolite

Simultaneous phosphate and ammonium removal from aqueous solution by a hydrated aluminum oxide modified natural zeolite

Theoretical and experimental study of ion-exchange process on zeolites from 5-1 structural group

Valorisation of N and P from waste water by using natural reactive hybrid sorbents: Nutrients (N,P,K) release evaluation in amended soils by dynamic experiments

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