A Further Investigation of NH4+ Removal Mechanisms by Using Natural and Synthetic Zeolites in Different Concentrations and Temperatures

Chen, Huei-Fen; Lin, Y.C.; Chen, Bohong; Iizuka, Yoshiyuki; Liou, Yi-Rou; Huang, Ruey‐Shing

doi:10.3390/min8110499

Cited by 35 publications

(16 citation statements)

References 25 publications

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“…These values mean that temperature, especially with its increase, plays a smaller role in the sorption of silver ions. Chen et al [40] also found a positive effect of temperature on the sorption of ammonium ions by natural zeolite. With increasing temperature from 25 to 50 °C, sorption capacity was reported to increase from 0.17 to 0.25 mEq/g.…”

Section: Resultsmentioning

confidence: 93%

Improved modification of clinoptilolite with silver using ultrasonic radiation

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Mashtaler

et al. 2021

Ultrasonics Sonochemistry

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The modification of natural clinoptilolite with silver ions using ultrasound has been investigated in the current work. The modification process was performed using clinoptilolite of different fractions (0–3.0 mm) over the temperature range of 25–55 °C, ultrasonic power range of 8.0–12.5 W and AgNO 3 concentration range of 0.01–0.1 M. The zeolite modification was performed in the presence of sonication and mechanical stirring in separate runs for comparison. Fundamental analysis demonstrated that the use of ultrasound ensures desorption of air from clinoptilolite particles and accelerates the diffusion of Ag + ions and subsequent ion exchange. Increasing the particle size of clinoptilolite led to a natural decrease in its sorption capacity. A slight increase in the sorption capacity with an increase in the equivalent particle diameter from 0.081 to 0.35 mm was seen due to changes in the structure of clinoptilolite particles during mechanical grinding. The calculated temperature coefficient of the sorption process of Ag + ions as <1.47 means that the modification takes place with dominant control in the intradiffusion region. Increasing the power of ultrasonic irradiation did not provide a monotonous change in the sorption capacity of clinoptilolite. Increasing the concentration of argentum nitrate solution provided an increase in the content of silver ions in clinoptilolite. In general, the advantage of using ultrasonic vibrations to modify the natural clinoptilolite of different fractions with Ag + ions was demonstrated in terms of achieving higher sorption capacity, also elucidating the effect of different operating conditions.

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Section: Resultsmentioning

confidence: 93%

Improved modification of clinoptilolite with silver using ultrasonic radiation

Знак

Зінь

Mashtaler

et al. 2021

Ultrasonics Sonochemistry

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“…Previous researchers have studied the application of zeolites for the purification of livestock wastewater, landfill wastewater and aquaculture water [3,4]. The relationship between zeolite structures and the mechanisms of removing pollutants was further discussed in [5]. Surprisingly, the physical properties and geological importance of the zeolite group minerals were not well known until the late 20th century [6].…”

Section: Introductionmentioning

confidence: 99%

Raman Spectroscopic Characteristics of Zeolite Group Minerals

Tsai

Huang

et al. 2021

Minerals

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In this work, Raman spectroscopic experiments are conducted on zeolites, including a total of 33 varieties and seven groups with different secondary structural frameworks, for which characteristic vibration modes are studied. Most of the zeolites show prominent Raman peaks in the spectral range between 200–1200 cm−1. Different groups of zeolites can be recognized by differences in the wavenumbers of the T-O-T (T = Si and Al, O = oxygen) modes in the range 379–538 cm−1, the M-O (M = metal,) modes in the range 250–360 cm−1 and the T-O bending modes in the range 530–575 cm−1. All zeolites show characteristic Raman peaks in the range 379–529 cm−1, except for natrolite group (fibrous) zeolites, which are characterized by T-O-T modes in the 433–447 cm−1 range and T-O bending modes in the 528–538 cm−1 range. The analcime group (with singly connected four-ring chains) zeolites show T-O-T modes in the 379–392 cm−1 and 475–497 cm−1 ranges. The gismondine group (with doubly connected four-ring chains) zeolites have T-O-T modes in the 391432 cm−1 and 463–497 cm−1 ranges. The chabazite group (with a six-cyclic ring) zeolites are characterized by M-O modes in the 320–340 cm−1 range and T-O-T modes in the 477–509 cm−1 range. The Raman modes of mordenite group zeolites (397–410 cm−1 and 470–529 cm−1) overlap with those of heulandite group zeolites (402–416 cm−1 and 480–500 cm−1). Moreover, the mordenite group has a characteristic peak in the 502–529 cm−1 range, and an additional peak in the 800–965 cm−1 range. Another recognizable peak for the heulandite group is in the 612–620 cm−1 range. The unknown zeolites (cowlesite) have unique characteristic peaks at 534 cm−1, which can aid in the verification of their identity.

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“…This equation is similar for all zeolites (straetlingite) that have been used for the NH 4 + removal [35].…”

Section: The Preparation Of Sorption Materialsmentioning

confidence: 99%

Preparation of Sorbents Containing Straetlingite Phase from Zeolitic By-Product and Their Performance for Ammonium Ion Removal

et al. 2021

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In this study, straetlingite-based sorbents were used for NH4+ ion removal from a synthetic aqueous solution and from the wastewater of an open recirculation African catfish farming system. This study was performed using column experiments with four different filtration rates (2, 5, 10, and 15 mL/min). It was determined that breakthrough points and sorption capacity could be affected by several parameters such as flow rate and mineral composition of sorption materials. In the synthetic aqueous solution, NH4+ removal reached the highest sorption capacity, i.e., 0.341 mg/g with the S30 sorbent at a filtration rate of 10 mL/min and an initial concentration of 10 mg/L of NH4+ ions. It is important to emphasize that, in this case, the Ce/C0 ratio of 0.9 was not reached after 420 min of sorption. It was also determined that the NH4+ sorption capacity was influenced by phosphorus. In the wastewater, the NH4+ sorption capacity was almost seven times lower than that in the synthetic aqueous solution. However, it should be highlighted that the P sorption capacity reached 0.512 mg/g. According to these results, it can be concluded that straetlingite-based sorbents can be used for NH4+ ion removal from a synthetic aqueous solution, as well as for both NH4+ and P removal from industrial wastewater. In the wastewater, a significantly higher sorption capacity of the investigated sorbents was detected for P than for NH4+.

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A Further Investigation of NH4+ Removal Mechanisms by Using Natural and Synthetic Zeolites in Different Concentrations and Temperatures

Cited by 35 publications

References 25 publications

Improved modification of clinoptilolite with silver using ultrasonic radiation

Improved modification of clinoptilolite with silver using ultrasonic radiation

Raman Spectroscopic Characteristics of Zeolite Group Minerals

Preparation of Sorbents Containing Straetlingite Phase from Zeolitic By-Product and Their Performance for Ammonium Ion Removal

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