Purification of Aqueous Media by Biochars: Feedstock Type Effect on Silver Nanoparticles Removal

Tomczyk, Agnieszka; Szewczuk-Karpisz, Katarzyna; Sokołowska, Z.; Kercheva, Milena; Dimitrov, Emil

doi:10.3390/molecules25122930

Cited by 15 publications

(8 citation statements)

References 43 publications

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“…The Langmuir model assumes that particles do not change their shape on the surface and ignores the interactions between them. Despite such crude simplifications, this equation is used for hairy particles. − Therefore, we approximated the simulated real adsorption isotherm using Langmuir adsorption isotherm where N c * = N c σ c 3 , N mon * = N mon σ c 3 , and N mon is the monolayer capacity (maximal number of cores in the monolayer), while K is the adsorption constant involving adsorption energy. These parameters can be calculated by linearization of eq .…”

Section: Resultsmentioning

confidence: 99%

“…This confirms the possibility of application of this equation to describe experimental results. 45 − 48 …”

Section: Discussionmentioning

confidence: 99%

“…The increasing number of various commercial products containing nanoparticles create a new type of nanowaste. − These materials can release nanoparticles into the environment. There is heightened concern about the long-term negative effects of nanoparticles due to their potential toxicity .…”

Section: Introductionmentioning

confidence: 99%

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Adsorption of Polymer-Tethered Particles on Solid Surfaces

2022

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We explore the behavior of polymer-tethered particles on solid surfaces using coarse-grained molecular dynamics simulations. Segment–segment, segment–core, and core–core interactions are assumed to be purely repulsive, while the segment–substrate interactions are attractive. We analyze changes in the internal structure of single hairy particles on the surfaces with the increasing strength of the segment–substrate interactions. For this purpose, we calculate the density profiles along the x , y , z axes and the mass dipole moments. The adsorbed hairy particles are found to be symmetrical in a plane parallel to the substrate but strongly asymmetric in the vertical direction. On stronger adsorbents, the particle canopies become flattened and the cores lie closer to the wall. We consider the adsorption of hairy nanoparticles dispersed in systems of different initial particle densities. We show how the strength of segment–substrate interactions affects the structure of the adsorbed phase, the particle–wall potential of the average force, the excess adsorption isotherms, and the real adsorption isotherms.

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Section: Resultsmentioning

confidence: 99%

“…This confirms the possibility of application of this equation to describe experimental results. 45 − 48 …”

Section: Discussionmentioning

confidence: 99%

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Adsorption of Polymer-Tethered Particles on Solid Surfaces

2022

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“…They were used for biochar modifications at the following concentrations: 500 mg/L–silver nanoparticles, 1 mol/L–vitamin C and 30%–H 2 O 2 . The silver nanoparticles (Ag-NPs) were obtained by the chemical reduction method [ 21 ]. Silver nitrate (AgNO 3 ) was used as a silver nanoparticle precursor, ascorbic acid–as a reducing agent, and polyvinyl pyrrolidone (PVP)–as a stabilizer.…”

Section: Methodsmentioning

confidence: 99%

Effect of Biochar Modification by Vitamin C, Hydrogen Peroxide or Silver Nanoparticles on Its Physicochemistry and Tetracycline Removal

Tomczyk

Szewczuk-Karpisz

2022

Materials

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Chemical modification of biochars can improve their adsorption capacity relative to antibiotics, posing a serious threat to the environment. Therefore, this research is aimed at the treatment of sunflower husk biochar (BC) by vitamin C, hydrogen peroxide or silver nanoparticles and the impact of this procedure on the biochar porosity, surface chemistry, and ability to remove tetracycline (TC). During the study, BC was produced by pyrolysis of sunflower husks at 650 °C. All solids were characterized using potentiometric titration, nitrogen adsorption/desorption, Fourier transform infrared spectroscopy, etc. The experimental adsorption data was described by kinetics equations: pseudo-first order, pseudo-second order, and particle internal diffusion (IPD) models as well as by isotherms of Langmuir, Langmuir-Freundlich, and Redlich-Peterson. The obtained results indicated that the biochar upgraded by vitamin C (BCV) had the highest ability to attract antibiotic molecules and, as a result, the TC adsorption on its surface was the largest. Furthermore, the TC desorption from this material was minimal. The measured TC adsorbed amounts for the modified BCs were as follows: 47.75% (7.47 mg/g) for BCV, 37.35% (8.41 mg/g)-for biochar treated by hydrogen peroxide (BCH), and 42.04% (9.55 mg/g) for biochar modified by silver nanoparticles (BCA). The lowest adsorption level was noted for non-modified biochar, i.e., 34.17% (6.83 mg/g). Based on the presented results it can be stated that the upgraded biochars had a good potential to improve the tetracycline removal from aqueous media, e.g., groundwater.

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“…Biochar is an example of organic compound, which can be mixed with various minerals. This carbonaceous material obtained from biomass is usually characterized by high adsorption capacity relative to inorganic and organic substances [ 16 , 17 , 18 ]. Mixed adsorbents may be used in wastewater treatment and soil remediation technologies [ 19 , 20 ].…”

Section: Introductionmentioning

confidence: 99%

Carboxin and Diuron Adsorption Mechanism on Sunflower Husks Biochar and Goethite in the Single/Mixed Pesticide Solutions

et al. 2021

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The study focused on the adsorption mechanism of two selected pesticides: carboxin and diuron, on goethite and biochar, which were treated as potential compounds of mixed adsorbent. The authors also prepared a simple mixture of goethite and biochar and performed adsorption measurements on this material. The adsorbents were characterized by several methods, inter alia, nitrogen adsorption/desorption, Boehm titration, Fourier transform infrared spectroscopy and X-ray photoelectron spectroscopy. The adsorption study included kinetics and equilibrium measurements, in the solution containing one or two pesticides simultaneously. The adsorption data were fitted to selected theoretical models (e.g., Langmuir, Freudlich, Redlich–Peterson, pseudo first-order and pseudo second-order equations). Based on the obtained results, it was stated that, among all tested adsorbents, biochar had the highest adsorption capacity relative to both carboxin and diuron. It equaled 0.64 and 0.52 mg/g, respectively. Experimental data were best fitted to the pseudo second-order and Redlich–Peterson models. In the mixed systems, the adsorption levels observed on biochar, goethite and their mixture were higher for diuron and lower for carboxin, compared to those noted in the single solutions. The presented results may enable the development of new mixed adsorbent for remediation of soils polluted with pesticides.

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Purification of Aqueous Media by Biochars: Feedstock Type Effect on Silver Nanoparticles Removal

Cited by 15 publications

References 43 publications

Adsorption of Polymer-Tethered Particles on Solid Surfaces

Adsorption of Polymer-Tethered Particles on Solid Surfaces

Effect of Biochar Modification by Vitamin C, Hydrogen Peroxide or Silver Nanoparticles on Its Physicochemistry and Tetracycline Removal

Carboxin and Diuron Adsorption Mechanism on Sunflower Husks Biochar and Goethite in the Single/Mixed Pesticide Solutions

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