The investigation into the adsorption removal of ammonium by natural and modified zeolites: kinetics, isotherms, and thermodynamics

Pan, Min; Zhang, Mingchuan; Zou, Xuehua; Zhao, Xuetong; Deng, Tianran; Chen, Tong; Huang, Xiaoming

doi:10.17159/wsa/2019.v45.i4.7546

Cited by 14 publications

(10 citation statements)

References 31 publications

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“…Moreover, the q ecal form pseudo‐second order plot is correlated with q eexp , expressing the adsorbents’ NH 4 + removal capacity adequately. The results of the present study come in agreement with other studies results, where aluminosilicates were examined for NH 4 + removal, and in all cases, pseudo‐second order kinetics express better this procedure, rendering NH 4 + adsorption on palygorskite samples a chemisorption (Alshameri et al, 2018; Chen et al, 2014; Pan et al, 2019). Moreover, in all cases the rate constant k 2 has negative value, which indicates desorption process (Tan, 2018).…”

Section: Resultssupporting

confidence: 92%

“…Moreover, the enthalpy change ΔH 0 for raw Pal and H‐Pal is negative, to the contrary of Na‐Pal and Ca‐Pal which is positive, revealing the change of reaction's nature from exothermic to endothermic respectively, which can verify the different behavior of Ca‐Pal and Na‐Pal compared to Pal or H‐Pal with temperature variance. The endothermic NH 4 + adsorption on Na‐aluminosilicate materials was also observed in the study of Pan et al (2019), where natural and Na‐zeolite were applied as NH 4 + adsorbents. The change of entropy ΔS 0 is positive only for Ca‐Pal, indicating that the adsorption's randomness is increased compared to raw palygorskite and its other modifications (Anastopoulos & Kyzas, 2016).…”

Section: Resultssupporting

confidence: 64%

“…On the other hand, there are modifications that can be much more cost‐effective, simpler, and capable of palygorskite's NH 4 + adsorption capacity enhancement. Specifically, such methods can be either acid activations, which remove zeolitic and intercrystalline water from mineral's structure leading to surface area increase (Chen et al, 2014; Zhang et al, 2021), or ions activations which can be exchangeable with NH 4 + , such as Na + or Ca 2+ enrichment which are two of the most preferable ions to be exchanged with NH 4 + (Pan et al, 2019). The enrichment of palygorskite with these cations was selected because, except for their low cost as raw materials, they are environmentally friendly without or with minor impacts on aquatic ecosystems or potable water.…”

Section: Introductionmentioning

confidence: 99%

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Raw and modified palygorskite in water treatment applications for low‐concentration ammonium removal

Gianni

Lazaratou

Panagopoulos

et al. 2021

Water Environment Research

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Raw palygorskite (Pal) samples went under acid (H‐Pal), NaCl (Na‐Pal), and CaCl2 treatment (Ca‐Pal) in order to be examined as ammonium (NH4+) sorbents from aqueous solutions. The samples were characterized by XRD and FT‐IR techniques to examine potential structural differences after modifications, and batch kinetic experiment series were applied to determine the optimal conditions for NH4+ removal. According to thermodynamic analysis, the removal reaction for sodium‐ and calcium‐treated samples was endothermic (ΔΗ0 > 0, 1.65 kJ/mol and 24.66 kJ/mol, respectively), in contrast with the exothermic reactions of raw and acidic‐treated palygorskite samples (ΔΗ0 < 0, −37.18 kJ/mol and −27.56 kJ/mol respectively). Moreover, each sample presented a different order of sorbed ions preference, whereas the strong affinity for Ca2+ sorption was common in all cases since the NH4+ removal inhibited. Nevertheless, a similar pattern was followed for raw and modified samples at isotherm study, rendering the linear form of Freundlich isotherm to express better the NH4+ sorption on palygorskite sample, indicating that it is a heterogeneous procedure. In all cases, the NH4+ maximum uptake was within 15 min using 8 g/L of each sorbent, especially for the Na‐Pal sample, which could reach almost 100% removal of low concentration NH4+. Practitioner Points Modified palygorskite samples were tested for NH4+ removal from aqueous solutions. NaCl‐treated palygorskite had the higher removal efficiency, which could reach almost 100% removal of low concentration NH4+. NH4+ maximum uptake was within 15 minutes using 8 g/L of each sorbent. NH4+ adsorption was an endothermic reaction for NaCl‐ and CaCl2‐treated palygorskite sorbents. NH4+ adsorption was an exothermic reaction for raw and acid‐treated palygorskite sorbents.

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Section: Resultssupporting

confidence: 92%

Section: Resultssupporting

confidence: 64%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Raw and modified palygorskite in water treatment applications for low‐concentration ammonium removal

Gianni

Lazaratou

Panagopoulos

et al. 2021

Water Environment Research

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“…Similar results were also recorded by Vu et al (2017) who used biochar. It is likely that at pH values above 9, most of the NH4 + is transformed to NH3(aq) and the electrostatic attraction to clay minerals decreases (Vu et al 2017;Pan et al 2019).…”

Section: Effect Of Phmentioning

confidence: 99%

Using raw and thermally modified fibrous clay minerals as low concentration NH4+–N adsorbents

Lazaratou

Triantaphyllidou

Pantelidis

et al. 2021

Environ Sci Pollut Res

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Raw and modified fibrous clay minerals palygorskite (Pal) and sepiolite (Sep) were tested for their ability to remove ammonium from ammonium polluted water. Palygorskite and sepiolite underwent thermal treatment at 400 o C (T-Pal and T-Sep respectively). Raw and thermally treated samples were characterized using XRD, SEM, BET, FT-IR, TGA, zeta potential and XRF. The techniques verified the effect of thermal treatment on samples structures and the enhancement of negative charge. Both raw and thermally-activated materials applied in batch kinetic experiments, and found to be efficient adsorbents in their raw forms, since Pal and Sep achieved 60 and 80% NH4 + -N removal respectively within 20 min of contact for initial NH4 + -N concentration of 4 mg/L. Similar removal rates were gained for other concentrations representative of contaminated aquifers that were examined, ranging from 1 mg/L to 8 mg/L. Results for the modified T-Pal and T-Sep minerals showed up to 20% higher removal rate. Saturation tests indicated the positive effect of thermal treatment on the minerals since T-Pal and T-Sep removal efficiency reached 85% and remained stable for 24 h. However, competitive ions in real water samples can influence the NH4 + -N removal efficiency of the examined samples. In all cases, the Freundlich isotherm and pseudo-second kinetic models showed better fitted all examined samples thus indicating heterogeneous chemisorption.

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“…It indicates that the selectivity order of ammonium over other cations on the synthesized zeolite was Ca 2+ > K + > Na + > Mg 2+ . However, several researches showed that ion exchange properties may be different among different zeolites [31,33].…”

Section: Effect Of Coexisting Ionsmentioning

confidence: 99%

Removal of Ammonium from Swine Wastewater Using Synthesized Zeolite from Fly Ash

Tang

Wang

et al. 2020

Sustainability

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Synthetic zeolites with pretreated fly ash as a raw material were used to remove ammonium from wastewater using a hydrothermal method in this study. Two pretreatment methods of fly ash were used to compare the ammonium removal of zeolites: water-washing and pickling. In addition, the effects of several factors including the time, temperature, pH, adsorbent dosage, coexisting ions and initial concentration were investigated to gain insight into the adsorption rate, behavior and mechanism of synthetic zeolites for ammonium. N2 adsorption/desorption isotherms showed that the synthetic zeolite was a mesoporous material with a higher specific area (13.05 m2/g) than the values for raw fly ash (0.34 m2/g). The X-ray diffraction result suggested that the synthetic products mainly belonged to zeolite P and Y. The adsorption kinetic data fitted well with a pseudo-second-order model. The maximum ammonium adsorption capacity was 32.16 mg/g. The synthetic zeolites were also applied to adsorb the ammonium from real swine wastewater. The ammonium removal efficiencies in raw swine wastewater and effluent from the biochemical unit were 64.34% and 79.61%, respectively, which indicated that the synthetic zeolites have a good application for real ammonium wastewater.

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The investigation into the adsorption removal of ammonium by natural and modified zeolites: kinetics, isotherms, and thermodynamics

Cited by 14 publications

References 31 publications

Raw and modified palygorskite in water treatment applications for low‐concentration ammonium removal

Raw and modified palygorskite in water treatment applications for low‐concentration ammonium removal

Using raw and thermally modified fibrous clay minerals as low concentration NH4+–N adsorbents

Removal of Ammonium from Swine Wastewater Using Synthesized Zeolite from Fly Ash

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