Validation of a new method for spectrophotometric determination of polyethylenimine

Patkowski, J.; Myśliwiec, Dawid; Chibowski, S.

doi:10.1080/1023666x.2016.1168651

Cited by 7 publications

(4 citation statements)

References 18 publications

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“…The PAA concentration was determined based on its reaction with hyamine 1622 resulting in formation of a white‐colored complex, absorbing light at the wavelength of 500 nm [29] . In turn, the PEI concentration was determined based on its reaction with CuCl 2 , which gives a blue‐colored complex, absorbing light at the wavelength of 285 nm [30] …”

Section: Methodsmentioning

confidence: 99%

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Preparation of biochars by conventional pyrolysis of herbal waste and their potential application for adsorption and energy purposes

Gęca,

Wiśniewska,

Nowicki

2024

ChemPhysChem

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The nettle, sage, mint and lemon balm herbs were used for biochars preparation. The physicochemical parameters of obtained materials were related to the lignocellulose composition of the precursors. It has been proved that the content of mineral substance has a significant influence on development of surface area, whereas the amount of hemicellulose affects the content of surface functional groups. It has been also shown that the obtained biochars are characterized by great energy parameters. The higher heating values (HHV) of the carbonaceous materials are comparable to the typical energy sources. The greatest HHV value (20.36 MJ/kg) was characteristic for the biochar obtained by pyrolysis of the lemon balm. In addition, the biochars were used for ionic polymers adsorption from one‐ and two‐components solutions. Despite the adsorbed amounts of macromolecules are not great is has been proved that polyethylenimine and polyacrylic acid have positive influence on their mutual adsorption.

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Section: Methodsmentioning

confidence: 99%

“…[29] In turn, the PEI concentration was determined based on its reaction with CuCl 2 , which gives a blue-colored complex, absorbing light at the wavelength of 285 nm. [30]…”

Section: Adsorption/desorption Studiesmentioning

confidence: 99%

Preparation of biochars by conventional pyrolysis of herbal waste and their potential application for adsorption and energy purposes

Gęca,

Wiśniewska,

Nowicki

2024

ChemPhysChem

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“…The PAA concentration was determined based on its reaction with hyamine 1622 resulting in formation of a white-colored complex, absorbing light at the wavelength 500 nm [ 31 ]. In turn, the PEI concentration was determined based on its reaction with CuCl 2 , which gives a blue-colored complex, absorbing light at the wavelength of 285 nm [ 32 ]. The adsorption isotherms of single adsorbates were obtained using the solutions with initial concentration changing in the range of 20–400 ppm.…”

Section: Methodsmentioning

confidence: 99%

Simultaneous Removal of Polymers with Different Ionic Character from Their Mixed Solutions Using Herb-Based Biochars and Activated Carbons

2022

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Nettle and the sage herbs were used to obtain carbonaceous adsorbents. For the biochar preparation the precursors were dried and subjected to conventional pyrolysis. Activated carbons were obtained during precursor impregnation with phosphoric(V) acid and multistep pyrolysis. The textural parameters and acidic-basic properties of the obtained adsorbents were studied. The activated carbons prepared from the above herbs were characterized by the largely developed specific surface area. The obtained carbonaceous adsorbents were used for polymer removal from aqueous solution. Poly(acrylic acid) (PAA) and polyethylenimine (PEI) were chosen, due to their frequent presence in wastewater resulting from their extensive usage in many industrial fields. The influence of polymers on the electrokinetic properties of activated carbon were considered. PAA adsorption caused a decrease in the zeta potential and the surface charge density, whereas PEI increased these values. The activated carbons and biochars were used as polymer adsorbents from their single and binary solutions. Both polymers showed the greatest adsorption at pH 3. Poly (acrylic acid) had no significant effect on the polyethylenimine adsorbed amount, whereas PEI presence decreased the amount of PAA adsorption. Both polymers could be successfully desorbed from the activated carbons and biochar surfaces. The presented studies are innovatory and greatly required for the development of new environment protection procedures.

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“…In the case of polyethyleneimine, a reaction with CuCl 2 was used. This formed a blue-colored complex that absorbed light at a wavelength of 285 nm [31]. The UV-Vis spectrophotometer Carry 100 (Varian, Palo Alto, CA, USA) was used for absorbance measurements.…”

Section: Adsorption Studiesmentioning

confidence: 99%

Investigation of Ionic Polymers’ Stabilizing and Flocculating Properties in Dispersed Activated Carbons Systems

Gęca,

Wiśniewska,

Nowicki

2024

Materials

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Activated carbons obtained via the thermochemical treatment of lemon balm and mint herbs were applied for ionic polymers adsorption, which directly affects the stability of these types of aqueous suspensions. The examined carbonaceous materials were characterized by well-developed specific surface area (approximately 1000 m2/g) and mesoporous structure. The adsorbed amounts of anionic poly(acrylic acid) and cationic polyethyleneimine from one-component solutions reached significant levels, but the efficiency of adsorption of these compounds from binary solutions slightly decreased. Moreover, the ionic polymers showed stabilizing properties towards the activated carbons suspensions. For both adsorbents, the most stable suspensions were systems containing both types of polymeric macromolecules with different ionic characters. This was due to the occurrence of electrosteric and depletion stabilization mechanisms. Furthermore, the zeta potential and size of particle aggregates were also influenced by the presence of polymers in the aqueous suspensions of activated carbons.

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Validation of a new method for spectrophotometric determination of polyethylenimine

Cited by 7 publications

References 18 publications

Preparation of biochars by conventional pyrolysis of herbal waste and their potential application for adsorption and energy purposes

Preparation of biochars by conventional pyrolysis of herbal waste and their potential application for adsorption and energy purposes

Simultaneous Removal of Polymers with Different Ionic Character from Their Mixed Solutions Using Herb-Based Biochars and Activated Carbons

Investigation of Ionic Polymers’ Stabilizing and Flocculating Properties in Dispersed Activated Carbons Systems

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