Sodium modification of low quality natural bentonite as enhanced lead ion adsorbent

Yang, Dongliang; Cheng, Feipeng; Chang, Le; Wu, Dengfeng

doi:10.1016/j.colsurfa.2022.129753

Cited by 18 publications

(8 citation statements)

References 44 publications

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“…These results agree with the chemical composition shown in Table 3, and also with previously published studies [25][26][27]. In addition to the difference in interlamellar spacing, the intensity of the main peak d 001 of smectite in Bent-Na was also lower [28,29]. This effect is probably related to the water amount in the clay mineral interlayers.…”

Section: Characterization Of Clayssupporting

confidence: 92%

“…The final mass losses were detected between 620-700 • C in both samples, with their origins related to the decomposition of carbonates. In this temperature range, the mass loss of the Bent-Na sample (2.4%, see Figure 6b) was more significant than the mass loss of the Bent-R sample (2.05%, see Figure 6a), due to the presence of Na 2 CO 3 in its composition [28]. These data corroborate with the results…”

Section: Characterization Of Clayssupporting

confidence: 89%

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New Urea Controlled-Release Fertilizers Based on Bentonite and Carnauba Wax

et al. 2023

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Controlled-release fertilizers are interesting alternatives to current commercial chemical fertilizers, which present a higher nutrient release rate, and can negatively impact the ecosystem. In this work, two urea controlled-release fertilizer types were manufactured from carnauba wax (CW), commercial granulated urea (U), and natural and sodium bentonite (Bent-R and Bent-Na, respectively). In the first type, the mechanochemical method produced fertilizers in bars, from a mixture containing different proportions of U, Bent-R, and Bent-Na. In the second type, the dip-coating method was used to coat urea bars with coatings containing different proportions of the Bent-R, Bent-Na, and CW. The cumulative urea release was evaluated over the 30-day incubation period, through soil columns tests and UV/visible spectroscopy. Overall, both fertilizers developed in this work presented lower cumulative urea release than standard fertilizers. On the other hand, the new fertilizers produced from the dip-coating method, provided cumulative urea release lower than that obtained by the mechanochemical method. In summary, carnauba wax and bentonite (raw and sodium modified) are promising materials for developing new urea controlled-release fertilizers. Furthermore, both carnauba wax and bentonite are non-toxic, biodegradable, relatively inexpensive, and created from materials that are easily purchased in Brazil, indicating that the new fertilizers developed in this work have the potential to be produced on a large scale.

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Section: Characterization Of Clayssupporting

confidence: 92%

Section: Characterization Of Clayssupporting

confidence: 89%

New Urea Controlled-Release Fertilizers Based on Bentonite and Carnauba Wax

et al. 2023

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“…The morphology and composition of materials according to SEM-EDX analysis are shown in Figure 1 and Table 1. The pillarization has expanded the layered structure of B-Na due to intramolecular force from intercalant that in-creases the swelling capacity [23]. According to the EDX data, intercalation affects lattice and interlayer structure.…”

Section: Resultsmentioning

confidence: 99%

Pillarization of Sumatera Bentonite by Sodium-assisted As Effective Adsorbent of Anionic Surfactants Sodium Lauryl Sulphate (SLS) Waste

Mohadi

Hakim

Astuti

et al. 2023

Bull. Chem. React. Eng. Catal.

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In this work, the Sumatera bentonite was sodium-pillarized in a new low-temperature and restricted time preparation route and then applied in anionic surfactant sodium lauryl sulphate removal. Structure characterization used Fourier Transform Infra Red (FT-IR), Scanning Electron Microscope - Energy Dispersive X-ray (SEM-EDX), X-ray Diffraction (XRD), and Brunauer–Emmett–Teller (BET) analysis. A strong peak at 22° and 35.66° in XRD analysis was detected as Sodium-pillar that increased crystallinity, then the functional changes of dehydration in lattice structure were detected in 1013 cm−1 by FTIR analysis. The morphology and compositional transformation were analyzed by SEM-EDX and BET analysis, denoted by increasing particle shape and sodium intercalant composition homogeneity. Moreover, the surface area increased from 61.791 to 66.086 m2/g. The sodium lauryl sulphate adsorption by bentonite-Na reached maximum capacity at 8.403 mg/g, which is higher than the pristine bentonite (5.747 mg/g) under the optimum condition. The adsorption mechanism is feasible, endothermic, and conformed to the pseudo-second-order and Freundlich adsorption model. The new route proposed for sodium intercalation effectively improves the Sumatera bentonite adsorption ability to remove sodium lauryl sulphate waste. Copyright © 2023 by Authors, Published by BCREC Group. This is an open access article under the CC BY-SA License (https://creativecommons.org/licenses/by-sa/4.0).

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“…Secondly, orthogonal experiment with three factors and three levels was carried out to determine the optimal processing parameters. An L9(3 4 ) orthogonal table was selected, as shown in table 2. Finally, a validating experiment was conducted using the optimal processing parameters obtained above.…”

Section: Experimental Designmentioning

confidence: 99%

“…[1]. As we all know, the quality of bentonite is determined by content of montmorillonite in it [2][3][4]. As a result, it is found in previous research and application practice that the applied Keerjian bentonite ranks in low to medium grade [5][6][7], with a montmorillonite content of about 50% [8].…”

Section: Introductionmentioning

confidence: 99%

Study on Wet Purification of Keerjian Bentonite

Deng

Lu²,

Shang³

et al. 2023

J. Phys.: Conf. Ser.

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The application potential of bentonite is closely related to the content of montmorillonite from it, and the purification of bentonite is conducive to expanding its industrial application. In this paper, purification method of Keerjian bentonite with low to medium grade were studied systematically. A comparative study of natural settlement, chemical dispersion and high-speed centrifugation was carried out. In addition, one-factor experiment and orthogonal experiment on a compound purification method, chemical dispersion following by high-speed centrifugation, were conducted. According to the experimental result, the optimal parameters of the compound purification, namely slurry ratio 1:8, dispersant amount 1.2% and soaking time 24h, were obtained. This study solved the problem of low utilization level and low purification efficiency, which shade light in the application of Keerjian bentonite with high efficiency and high economic benefits.

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Sodium modification of low quality natural bentonite as enhanced lead ion adsorbent

Cited by 18 publications

References 44 publications

New Urea Controlled-Release Fertilizers Based on Bentonite and Carnauba Wax

New Urea Controlled-Release Fertilizers Based on Bentonite and Carnauba Wax

Pillarization of Sumatera Bentonite by Sodium-assisted As Effective Adsorbent of Anionic Surfactants Sodium Lauryl Sulphate (SLS) Waste

Study on Wet Purification of Keerjian Bentonite

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