Influence of adsorption sites of biochar on its adsorption performance for sulfamethoxazole

Li, Yinxue; Wang, Bin; Shang, Hongru; Cao, Yongna; Yang, Chunhui; Hu, Weijie; Feng, Yujie; Yu, Yanling

doi:10.1016/j.chemosphere.2023.138408

Cited by 36 publications

(7 citation statements)

References 46 publications

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“…In addition, the –NH 2 on RBB KN-R would form hydrogen bonds with nitrogen-containing and oxygen-containing functional groups on the surface of CBHBs, acting as H-donor. Moreover, the benzene ring on RBB KN-R could engage in π–π interactions and hydrophobic interaction with the benzene ring and hydrophobic surface of CBHBs, which is consistent with other studies on the removal of organic pollutants with aromatic rings [ 46 , 47 , 48 ]. In summary, the proposed mechanisms are illustrated in Figure 9 .…”

Section: Resultssupporting

confidence: 90%

Enhanced Reactive Brilliant Blue Removal Using Chitosan–Biochar Hydrogel Beads

Zhao,

Song,

et al. 2023

Molecules

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To address the challenges associated with the weak affinity and difficult separation of biochar, we developed chitosan–biochar hydrogel beads (CBHBs) as an efficient solution for removing reactive brilliant blue (RBB KN-R) from wastewater. The adsorption behavior and mechanism of RBB KN-R onto CBHBs were extensively studied. Notably, the adsorption capacity of RBB KN-R showed pH-dependence, and the highest adsorption capacity was observed at pH 2. The adsorption process was well fitted with the pseudo-second-order kinetic model and the intraparticle diffusion model. Film diffusion and intraparticle diffusion were both responsible for the adsorption of RBB KN-R onto CBHBs. At 298.15 K, the maximum adsorption capacity qm was determined to be 140.74 mg/g, with higher temperatures favoring the adsorption process. A complex mechanism involving π–π interactions, electrostatic attraction, hydrophobic interaction, and hydrogen bonding was found to contribute to the overall adsorption process. The experimental data discovered the coexisting substances and elevated ionic strength hindered the adsorption capacity. Significantly, after three cycles of adsorption–desorption, the CBHBs maintained an adsorption capacity above 95% for RBB KN-R. These promising results imply that CBHBs are a durable and cost-effective adsorbent for efficient removal of dyes from wastewater.

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Section: Resultssupporting

confidence: 90%

Enhanced Reactive Brilliant Blue Removal Using Chitosan–Biochar Hydrogel Beads

Zhao,

Song,

et al. 2023

Molecules

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“…The outcome of the process activated with potassium carbonate has the highest specific surface area among those produced by activated carbonization with other activators,. Figure 2b depicted the isotherm for SPC‐K7, which was classified as type I by the International Union of Pure and Applied Chemistry (IUPAC) and associated with the microporous structure [29] . The density functional theory (DFT) model was used to determine the pore size distribution of SPC‐K7 by minimizing the grand potential as a function of fluid density profile.…”

Section: Resultsmentioning

confidence: 99%

“…Figure 2b depicted the isotherm for SPC-K7, which was classified as type I by the International Union of Pure and Applied Chemistry (IUPAC) and associated with the microporous structure. [29] The density functional theory (DFT) model was used to determine the pore size distribution of SPC-K7 by minimizing the grand potential as a function of fluid density profile. From the pore size distribution, it can be seen that the microporous pore size distribution ranges from 1.17 to 1.85 nm, contains a portion of mesopores between 2.21 and 2.64 nm, and the average pore size (D pore ) is 1.41 nm.…”

Section: Specific Surface Area and Pore Structural Characterizationmentioning

confidence: 99%

Formation Mechanism of a Hierarchically Porous Carbon Based on Soybean Hull Residues and Its Adsorption Performance

Ma,

Zhang,

Huang

et al. 2023

ChemistrySelect

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Soybean residue has caused pollution to the environment due to high output. Herein, in order to reutilization soybean residue, a novel soybean hulls residue based hierarchically porous carbon was prepared by one‐step carbonization‐activation, and its structure and micromorphology were characterized by SEM, FT‐IR, Raman, TEM, BET and XPS. Based on results of characterization, which illustrated typical hierarchically pore structure with pore sizes are 1000 nm, 300 nm and 1.4 nm. The specific surface area and total pore volume were corresponded to 1455.41 m2/g and 0.731 cm3/g, respectively. And the pore‐forming mechanism was discussed in raw materials is a pyrolysis process. Furthermore, it was found that adsorption capacity of dye could got to 625 mg/g in 30 min when the adsorbent was 0.05 g. In summary, the soybean hulls residue based hierarchically pore material with large surface area and rich in pore structure, which will exhibit excellent performance towards wastewater treatment.

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“…With the rise in pyrolysis temperature, decreased -OH and -NH 2 on biochars weakened the π-π EDA interaction between OFL and biochars, leading to decreased OFL sorption. Although the increased polyaromatic structure at high temperatures may provide rich π electrons for the interaction with OFL [55], the inner surface cannot be accessed by OFL because of the size exclusion effect mentioned above.…”

Section: (Ii) Cation Exchangementioning

confidence: 99%

Insights into the Roles of Surface Functional Groups and Micropores in the Sorption of Ofloxacin on Banana Pseudo-Stem Biochars

Wang,

Yang,

Wang

et al. 2024

Sustainability

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In the present study, banana pseudo-stem (BS) was pyrolyzed under anaerobic conditions without any physical or chemical modification. Their properties, as well as their sorption affinity to ofloxacin (OFL), were studied. As a result, oxalates and KCl formed at a relatively low temperature of 300 °C, while bicarbonates generally formed at a pyrolysis temperature above 400 °C. Surface functional groups of BS biochars facilitated OFL sorption mainly via specific interactions including electronic attraction (EA), π–π electron donor–acceptor (π–π EDA) interaction, the ordinary hydrogen bond (OHB), and the negative charge-assisted hydrogen bond ((−)CAHB). Except for (−)CAHB, these interactions all decreased with an elevated pH, resulting in overall decreased OFL sorption. Significant OFL sorption by BS biochars produced at 300 °C, observed even at an alkaline condition was attributed to (−)CAHB. Micropores formed in BS biochar prepared at 500 °C, with a specific surface area as high as 390 m2 g−1 after water washing treatment. However, most micropores could not be accessed by OFL molecules due to the size exclusion effect. Additionally, the inherent K-containing salts may hinder OFL sorption by covering the sorption sites or blocking the inner pores of biochars, as well as releasing OH− into the solution. Thus, BS biochar produced at 300 °C is an excellent sorbent for OFL removal due to its high sorption ability and low energy. Our findings indicate that biochar techniques have potential win–win effects in recycling banana waste with low energy and costs, and simultaneously converting them into promising sorbents for the removal of environmental contaminants.

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Influence of adsorption sites of biochar on its adsorption performance for sulfamethoxazole

Cited by 36 publications

References 46 publications

Enhanced Reactive Brilliant Blue Removal Using Chitosan–Biochar Hydrogel Beads

Enhanced Reactive Brilliant Blue Removal Using Chitosan–Biochar Hydrogel Beads

Formation Mechanism of a Hierarchically Porous Carbon Based on Soybean Hull Residues and Its Adsorption Performance

Insights into the Roles of Surface Functional Groups and Micropores in the Sorption of Ofloxacin on Banana Pseudo-Stem Biochars

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