Studies on the performance of functionalized Fe3O4 as phosphate adsorbent and assessment to its environmental compatibility

Angkawijaya, Artik Elisa; Tran-Chuong, Yen Nhi; Ha, Quoc Nam; Tran‐Nguyen, Phuong Lan; Santoso, Shella Permatasari; Bundjaja, Vania; Go, Alchris Woo; Hsu, Hsien‐Yi; Ju, Yi‐Hsu

doi:10.1016/j.jtice.2021.104162

Cited by 9 publications

(17 citation statements)

References 66 publications

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“…In a similar study, Angkawijaya et al . also reported that a low adsorption efficiency of phosphate occurred at pH > pH pzc 33 . Based on the interpretation relating to the change in the adsorbent surface charge at different pH, the above results are consistent.…”

Section: Resultssupporting

confidence: 73%

“…Electrostatic interactions between NaP1 surface and phosphate ions easily occurred, enhancing the adsorption capacity of zeolite 54 . The surface of zeolite NaP1 carried a more negative charge at pH > pH pzc , resulting in a hindered adsorption ability for anions 33,55 …”

Section: Resultsmentioning

confidence: 99%

“…Additionally, the adsorption energy can be changed due to the heterogeneity of the adsorption surface 59,61 . The values of 1/n F and n F are 0.537 and 1.862, respectively, while favorable adsorption will be processed at n F values from 1 to 10, and n F > 1 can also predict the physical adsorption process 33,59 …”

Section: Resultsmentioning

confidence: 99%

“…A Nova 2000 instrument (Quantachrome Instruments, USA) was applied for N 2 adsorption–desorption at 77 K and the samples were degassed at 423 K for 6 h before measurement. The surface area and pore size were determined using the Brunauer–Emmett–Teller (BET) model 33 . The particle size distribution of NaP1 was examined via DLS (SZ‐100, Horiba, Japan).…”

Section: Methodsmentioning

confidence: 99%

“…The adsorption data were analyzed based on Langmuir, Freundlich, Temkin, Sips and Redlich‐Peterson adsorption isotherm models. The Langmuir and Freundlich adsorption models described the monolayer and multilayer adsorption between the adsorbed molecules and the adsorbent 33 . The Temkin model expresses the physical or chemical adsorption process via the adsorption heat parameter 36 .…”

Section: Methodsmentioning

confidence: 99%

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Evaluation of the potential removal of phosphate using rice husk ash‐derived zeolite NaP1

Tran‐Nguyen

Nguyen

et al. 2023

J of Chemical Tech & Biotech

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BACKGROUND Zeolite NaP1 with high crystalline intensity and good shape has been synthesized by utilizing rice husk ash. Several factors related to the formation of zeolite, such as mixing ratios, aging time, and reaction time, were investigated. Furthermore, the potential phosphate adsorption of the optimal synthesized zeolite was evaluated. RESULTS Under the optimal conditions (SiO2/Al2O3 molar ratio = 4.0, NaOH concentration = 1.5 M, aging time = 12 h, and reaction time = 8 h), the surface area and pore diameter of the zeolite NaP1 obtained were 50 m2 g−1 and 40.77 Å, respectively. By varying the aging and reaction times, zeolite NaP1 with different surface areas could be created. Specifically, reducing the aging time and reaction time result in zeolite NaP1 with a lower surface area. The adsorption efficiency and adsorption capacity of the optimal synthesized zeolite NaP1 were 38.67% and 19.97 mg g−1, respectively, at pH 6.0, with an initial phosphate concentration of 100 mg L−1, an adsorbent dosage of 2 g L−1, and a contact time of 120 min. The data are well described under the Temkin and Redlich‐Peterson models, with the correlation coefficients of 0.991 and 0.995, respectively. The maximum adsorption capacity of the Langmuir model reached 19.053 mg g−1. CONCLUSION The main contribution of this work is the direct use of rice husk ash without pretreatment to generate high crystalline zeolite NaP1 in a shorter time. The phosphate ion removal efficiency by zeolite NaP1 may be further improved by functionalizing zeolite surfaces and expanding its other applications. © 2023 Society of Chemical Industry (SCI).

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Section: Resultssupporting

confidence: 73%

Section: Resultsmentioning

confidence: 99%