Revealing the effect of preparation parameters on zeolite adsorption performance for low and medium concentrations of ammonium

He, Wenyan; Gong, Hui; Fang, Kuo; Peng, Fei; Wang, Kaijun

doi:10.1016/j.jes.2019.05.021

Cited by 29 publications

(8 citation statements)

References 48 publications

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“…The findings suggested a non-uniform distribution of adsorption energy over the surface of the zeolite adsorbent. 54 Similarly, the heterogeneity factor 1/ n was between 0–1 suggesting that the adsorption process was favorable.…”

Section: Resultsmentioning

confidence: 99%

Microwave-assisted synthesis of coal fly ash-based zeolites for removal of ammonium from urine

et al. 2020

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Section: Resultsmentioning

confidence: 99%

Microwave-assisted synthesis of coal fly ash-based zeolites for removal of ammonium from urine

et al. 2020

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“…The capacity of ammonium uptake depends on the type of zeolites, crystallinity of zeolites, ratio of Si to Al and ratio Na 2 O to SiO 2 [11,21,24]. The synthetic NaY zeolite reported 70% of ammonium removal, which shows that the natural zeolites could have a better performance than the synthetic one [24].…”

Section: Ammonium Removalmentioning

confidence: 98%

“…Some other zeolite occurrences show a higher percentage of ammonium removal events without modification such as zeolites from Bulgaria and Iran [22,23]. The capacity of ammonium uptake depends on the type of zeolites, crystallinity of zeolites, ratio of Si to Al and ratio Na2O to SiO2 [11,21,24]. The synthetic NaY zeolite reported 70% of ammonium removal, which shows that the natural zeolites could have a better performance than the synthetic one [24].…”

Section: Ammonium Removalmentioning

confidence: 99%

Improving Ammonium Sorption of Bayah Natural Zeolites by Hydrothermal Method

et al. 2020

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Natural zeolites are easily found and abundant in Indonesia. The natural zeolites are low-cost minerals; however, their ammonium sorption is poor. A hydrothermal method was applied to improve the ammonium sorption. Hydrothermal treatment times were varied 8, 24, and 32 h. The parent and hydrothermal treated samples were characterized by using X-ray diffraction (XRD), Field Emission Scanning Electron Microscopes (FE-SEM), Fourier-transform infrared spectroscopy (FTIR), and nitrogen physisorption. Ammonium adsorption was performed using a batch reactor to evaluate the adsorption performance of the prepared zeolite samples. The 8 h hydrothermal (HT 8 h) treated zeolites showed the highest ammonium removal percentage among others. The XRD analysis of HT 8 h shows a higher crystallinity of mordenite and the Brunauer–Emmett–Teller (BET) model shows a surface area of 105 m2/g, much larger as compared to the parent with a surface area of 19 m2/g. Various kinetic and isotherms models were also studied on the parent and HT 8 h samples. The intraparticle equation showed the most accurate model for the kinetic data and the Freundlich equation showed the most accurate model for the isotherm of the experimental data. In terms of ammonium removal efficiency, hydrothermally treated Bayah mordenite compares favorably with treated mordenite from other locations despite that clinoptilolite provides higher removal capacities than mordenite.

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“…This is probably because the crystallization time has a significant impact on the crystal shape and crystallinity of zeolite ( Figure 4a). This phenomenon illustrates that the zeolite structure might be unstable when the crystallization time was less than 48 h, but too much time could result in hybrid crystals due to the secondary nucleation [12]. The potential highest ammonium removal efficiency of 83.19% for zeolite was observed at the synthetic temperature of 100 • C (Figure 4b).…”

Section: Pre-treatment and Synthetic Parametersmentioning

confidence: 97%

“…The zeolite 2 of 15 prepared from raw fly ash often has a low adsorption capacity for ammonium, and its application was limited in the field of high concentration wastewater [11]. Therefore, some suitable pretreatments of raw fly ash before a conventional hydrothermal process and optimum synthesis parameters before use are necessary to acquire a higher adsorption capacity for ammonium [12,13].…”

Section: Introductionmentioning

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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Revealing the effect of preparation parameters on zeolite adsorption performance for low and medium concentrations of ammonium

Cited by 29 publications

References 48 publications

Microwave-assisted synthesis of coal fly ash-based zeolites for removal of ammonium from urine

Microwave-assisted synthesis of coal fly ash-based zeolites for removal of ammonium from urine

Improving Ammonium Sorption of Bayah Natural Zeolites by Hydrothermal Method

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

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