Comparative Study of Sample-Preparation Techniques for Quantitative Analysis of the Mineral Composition of Humic Substances by Inductively Coupled Plasma Atomic Emission Spectroscopy

Karpukhina, E. A.; Vlasova, E. A.; Volkov, Dmitry S.; Проскурнин, М. А.

doi:10.3390/agronomy11122453

Cited by 7 publications

(5 citation statements)

References 51 publications

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“…The stretching vibration peak of S=O overlaps with the ether peak in the 1195–1168 cm −1 range and the sulfonate peak is also observed at 622 cm −1 [35] . On the other hand, the stretching vibrations of C=C bonds in an aromatic structure are observed at 1600, 1500, and 1400 cm −1 [35,36] …”

Section: Resultsmentioning

confidence: 93%

“…[35] On the other hand, the stretching vibrations of C=C bonds in an aromatic structure are observed at 1600, 1500, and 1400 cm À 1 . [35,36] During the membrane's characterization, the functional groups incorporated inside the hybrid membrane were first identified using ATR-FTIR. Figure 2a shows the ATR-FTIR spectra of PVDF membrane, PVDF/lignin (PL2 % and PL4 %), and PVDF/ lignosulfonate (PLs2 % and PLs4 %) membranes.…”

Section: Polymorphic Structure Analysis Of Membranementioning

confidence: 99%

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Comprehensive Study of Physicochemical Properties in Poly‐(Vinylidene Fluoride) Membranes Loaded with OPEFB's Lignin/ Lignosulfonate via Phase Inversion

Adi Nugroho,

Widiyanto,

Karimah

et al. 2024

ChemistrySelect

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The development of membrane technology is rapidly advancing, such as hydrophilic PVDF membranes, which provide anti‐fouling properties to the membrane. Therefore, this research innovates the development of hydrophilic PVDF membranes by incorporating lignin‐lignosulfonate fillers from OPEFBs in situ. This study successfully prepared hybrid PVDF membranes using the phase inversion method. ATR‐FTIR, XRD, and TGA/DSC analyses confirmed that the addition of 2 % filler promoted the formation of the β‐phase in PVDF, which was more dominant than with the addition of 4 % filler, especially in the PLs2 % membrane. SEM images of the membranes showed an asymmetric structure with finger‐like and sponge‐like pores. Interactive 3D surface imaging demonstrated increased pore potential peaks when lignosulfonate was added compared to lignin. The addition of 4 % filler had a hydrophilic‐hydrophobic repelling effect, increasing the porosity and water absorption of the PL4 % and PLs4 % membranes. Phase inversion membranes were relatively hydrophilic with a water contact angle of 61°, and adding filler reduced the membrane‘s contact angle by 8°. Based on the obtained results, it can be concluded that PVDF hybrid membranes with lignin and lignosulfonate fillers have significant potential for development in membrane technology applications that require hydrophilic membranes, such as wastewater treatment and seawater desalination.

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Section: Resultsmentioning

confidence: 93%

Section: Polymorphic Structure Analysis Of Membranementioning

confidence: 99%

Comprehensive Study of Physicochemical Properties in Poly‐(Vinylidene Fluoride) Membranes Loaded with OPEFB's Lignin/ Lignosulfonate via Phase Inversion

Adi Nugroho,

Widiyanto,

Karimah

et al. 2024

ChemistrySelect

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“…Range (cm -1 ) Wavelength (cm -1 ) SO3-, S=O strain 1032-1052 [13] 1038,43 S-O strain (1) 1020-1040 [5] 1038,43 S-O strain (2) 820-960 [5] 897,94…”

Section: Functional Groups Standard Wavelengthmentioning

confidence: 99%

Production of Sodium Lignosulfonate (SLS) Surfactant from Oil Palm Empty Fruit Bunches (OPEFB) Using Microwave

Qadariyah,

Ramadhan,

Gusti

2024

E3S Web Conf.

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The aim of this study was to investigate the effect of using a microwave in synthesizing Sodium Lignosulfonate (SLS) surfactant made of Oil Palm Empty Fruit Bunches (OPEFB) which contains lignin as the content to be processed, especially in the sulfonation process. The observed variables are the NaHSO3 concentration ranging from 0.1 M to 0.7 M, reaction time ranging from 30 minutes to 90 minutes, and microwave power ranging from 300 W to 750 W. on the yield and comparing the results of SLS synthesized with microwave to those obtained through conventional heating methods in the sulfonation process. The process encompassed several steps, including drying, milling, delignification, lignin isolation, and sulfonation using microwaves. Afterward, the SLS results were subjected to analysis through FTIR and HLB testing. The findings revealed a positive correlation between NaHSO3 concentration, reaction time, microwave power, and the yield of SLS Product, with the optimal conditions being at the NaHSO3 concentration of 0.7 M, microwave power of 600 W, and reaction time of 75 minutes. Moreover, the microwave method demonstrated greater efficiency in increasing the SLS Product yield by up to 24% compared to the conventional method.

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“…The content of macro-and microelements for additional information was determined by inductively coupled plasma atomic emission spectroscopy (ICP-AES) after acid decomposition of the samples [46]; see Section 2.3 for other details.…”

Section: Samplementioning

confidence: 99%

“…Linear or quadratic functions were used for calibration. All other details were as described previously [46].…”

Section: Icp-aes Analysismentioning

confidence: 99%

Temperature Dependences of IR Spectral Bands of Humic Substances of Silicate-Based Soils

2023

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Temperature-dependent IR spectroscopy capable of revealing specific changes in the band intensities, positions, and shape was used to increase the information on humic substances (HS) from soils. Temperature dependences of IR spectra of HS isolated from silicate-based soils differing in the contents and nature of organic matter, chernozem and soddy podzolic soil, were investigated by attenuated total internal reflection FTIR in the mid-IR region (4000–400 cm−1) in the air within the moderate temperature range of 25–215 °C (298–488 K) with a step of 2.5 °C. The dependences of shifts in frequency (wavenumber) corresponding to band maxima and integrated band intensities were built for all major bands. Observed reversible frequency shifts upon heating and cooling can be interpreted as forming structures in the dry state. The behavior of integrated intensities of bands assigned to C–H and C–C vibrations, characteristic vibrations of polyaromatic compounds, carboxylic acids, and carboxylates were shown, and similar behavior for the same group (symmetric and antisymmetric stretches) were revealed. Differences in the temperature trends in chernozem and soddy podzolic soils due to different structures (aliphatic and aromatic) and functional groups (carboxylic and carboxylate) are shown. The different behavior of the bands corresponding to carboxylic groups and skeletal vibrations differentiates soil types with different organic matter. The temperature trends of band maximum and intensity shifts are less prone to measurement conditions and may serve as qualitative parameters characterizing the composition of soil humic substances.

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Comparative Study of Sample-Preparation Techniques for Quantitative Analysis of the Mineral Composition of Humic Substances by Inductively Coupled Plasma Atomic Emission Spectroscopy

Cited by 7 publications

References 51 publications

Comprehensive Study of Physicochemical Properties in Poly‐(Vinylidene Fluoride) Membranes Loaded with OPEFB's Lignin/ Lignosulfonate via Phase Inversion

Comprehensive Study of Physicochemical Properties in Poly‐(Vinylidene Fluoride) Membranes Loaded with OPEFB's Lignin/ Lignosulfonate via Phase Inversion

Production of Sodium Lignosulfonate (SLS) Surfactant from Oil Palm Empty Fruit Bunches (OPEFB) Using Microwave

Temperature Dependences of IR Spectral Bands of Humic Substances of Silicate-Based Soils

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