Nanopore-filling effect of phenanthrene sorption on modified black carbon

Hu, Shujie; Zhang, Dainan; Xiong, Yongqiang; Yang, Yu; Ran, Yong

doi:10.1016/j.scitotenv.2018.06.115

Cited by 12 publications

(20 citation statements)

References 53 publications

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“…Many investigators have shown that the sorption mechanisms of HOCs on BCs are diverse, including specific sorption, nonspecific sorption, partitioning, and pore-filling. − Among them, the micropore-filling mechanism has been investigated in recent years. A few of the findings regarding the micropore-filling sorption mechanism of HOCs have been documented. , For example, Ran et al reported that micropore-filling of HOCs accounted for 45–98% of total sorption by peat and soil, and Zhang et al noted that 36–65% of HOCs can be adsorbed on kerogen by micropore-filling. Other investigations revealed that for condensed carbonaceous materials, organic carbon (OC) was the main medium to produce micropores, as significantly positive correlations were reported between the micropore volumes and OC contents or structure. ,, For example, it was found that the aliphatic C of the OC fractions and the aromatic C of biochars were key components determining their micropore and sorption behaviors of HOCs .…”

Section: Introductionmentioning

confidence: 99%

Effects of the Chemical Structure, Surface, and Micropore Properties of Activated and Oxidized Black Carbon on the Sorption and Desorption of Phenanthrene

Zhang

Yang

et al. 2019

Environ. Sci. Technol.

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The effects of the chemical structure, surface properties, and micropore of modified black carbon samples (BCs) on the sorption mechanism of hydrophobic organic contaminants (HOCs) are discussed. Activated and oxidized BCs were produced from a shale kerogen at 250–500 °C by chemical activation regents (KOH and ZnCl2) and then by oxidative regents (H2O2 and NaClO). The surface properties (water contact angel, Boehm titration, and cation exchange capacity, CEC), structural properties (advanced solid-state 13C NMR), micropore properties (CO2 adsorption), mesopore properties (N2 adsorption), and sorption and desorption properties of phenanthrene were obtained. The results showed that ZnCl2-activated BCs had higher basic surface groups, CEC values, aromatic carbon contents, micropore volumes, and adsorption volumes but exhibited lower acidic surface groups than the KOH-activated BCs did. Micropore modeling and sorption irreversibility indicated that the micropore filling was the main sorption mechanism of phenanthrene. In addition, ZnCl2 activated and NaClO oxidized BCs showed a nice regression equation between adsorption volumes and micropore volumes (CO2–V 0) as follows: Q 0 ′ = 0.495V 0 + 6.28(R 2 = 0.98, p < 0.001). Moreover, the contents of nonprotonated aromatic carbon, micropore volumes, and micropore sizes are the critical factors to micropore filling mechanism of phenanthrene on BCs. The size of fused aromatic rings was estimated from the recoupled 1H–13C dipolar dephasing, and the BC structural models at temperatures ranging from 300 to 500 were proposed. This finding improves our understanding of the sorption mechanism of HOCs from the perspectives of chemical structure and micropore properties.

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Section: Introductionmentioning

confidence: 99%

Effects of the Chemical Structure, Surface, and Micropore Properties of Activated and Oxidized Black Carbon on the Sorption and Desorption of Phenanthrene

Zhang

Yang

et al. 2019

Environ. Sci. Technol.

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“…The significant difference in the sorption capacity might be due to their different structures and compositions of pollens/spores of lower and higher plant species. The single log K oc of Phen for the pollen sporopollenins ranged from 5.74 to 6.07 mL/g at C e = 5.6 μg/L, which was higher than that of the lotus pollen sporopollenins (5.68 mL/g), and was practically comparable to that of modified black carbon (5.52–6.08 mL/g) . As in this laboratory experiment, producing a small quantity of sporopollenins is expensive.…”

Section: Resultsmentioning

confidence: 57%

“…The CO 2 sorption isotherms were measured at 273 K in a relative pressure range of 1 × 10 –6 to 0.03 using a Micromeritics ASAP 2460 surface area and pore size analyzer. The calculation of the micropore volume and the SSA was performed using the Dubinin–Radushkevich (DR) model and density functional theory (DFT), respectively, and the nanopore size distribution was determined with DFT . Solid-state 13 C nuclear magnetic resonance (NMR) experiments were performed on a Bruker AVANCE III 400 spectrometer (Bruker, Germany) operating at 400 MHz 1 H and 100 MHz 13 C frequencies.…”

Section: Materials and Methodsmentioning

confidence: 99%

“…The calculation of the micropore volume and the SSA was performed using the Dubinin−Radushkevich (DR) model and density functional theory (DFT), respectively, and the nanopore size distribution was determined with DFT. 32 Solid-state 13 C nuclear magnetic resonance (NMR) experiments were performed on a Bruker AVANCE III 400 spectrometer (Bruker, Germany) operating at 400 MHz 1 H and 100 MHz 13 C frequencies. The characterization method of NOM structures is described in detail in the Supporting Information.…”

Section: ■ Materials and Methodsmentioning

confidence: 99%

“…The single log K oc of Phen for the pollen sporopollenins ranged from 5.74 to 6.07 mL/g at C e = 5.6 μg/L, which was higher than that of the lotus pollen sporopollenins (5.68 mL/g), 9 and was practically comparable to that of modified black carbon (5.52−6.08 mL/g). 32 As in this laboratory experiment, producing a small quantity of sporopollenins is expensive. However, in a large-scale batch, the abovementioned experiment procedures may be modified to attain the low-cost requirements, such as designing assembly line and using industrial or chemical pure reagents.…”

Section: Environmental Science and Technologymentioning

confidence: 99%

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Importance of Sporopollenin Structure and Accessibility in the Sorption of Phenanthrene by Biota Spores and Pollens

Zhang

et al. 2019

Environ. Sci. Technol.

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Although spores/pollens are so abundant and ubiquitous in the environment, the role of these natural organic matter concerning fate and transport of organic pollutants in the environment is neglected. Lipid-free fractions and sporopollenins were isolated from seven spores/pollens collected from lower and higher biota species and were characterized by elemental analysis, CO2 adsorption techniques, and advanced solid-state 13C nuclear magnetic resonance spectroscopy. Then, the sorption isotherms of phenanthrene (Phen) on all the samples were investigated by a batch technique. The sporopollenins were a highly cross-linked polymer including alkyl carbon, poly(methylene) carbon, and aromatic carbon as well as oxygen functionalities; additionally, their sorption capacities (K oc) for Phen reached up to 1 170 000 mL/g, suggesting that some of the sporopollenins were good biopolymeric sorbents for the removal of hydrophobic organic contaminants in aquatic media. A highly significant and positive correlation between the sorption capacity of Phen and the aliphaticity of the sporopollenins suggested that their structure was critical to Phen sorption. Meanwhile, the (O + N)/C atomic ratios and polar groups were significantly and negatively correlated with the sorption capacity of Phen, indicating that accessibility also played a significant role in the sorption process. Moreover, variable correlations between the sorption capacities (K oc) and the micropore volumes of the spore/pollen fractions were observed. This study sheds light on the importance of the polarity, microporosity, and structure of sporopollenins in the sorption process of Phen.

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Modification of glycidyl methacrylate based cryogels by cellulose nanocrystals and determination of dye adsorption performance

et al. 2022

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Nanopore-filling effect of phenanthrene sorption on modified black carbon

Cited by 12 publications

References 53 publications

Effects of the Chemical Structure, Surface, and Micropore Properties of Activated and Oxidized Black Carbon on the Sorption and Desorption of Phenanthrene

Effects of the Chemical Structure, Surface, and Micropore Properties of Activated and Oxidized Black Carbon on the Sorption and Desorption of Phenanthrene

Importance of Sporopollenin Structure and Accessibility in the Sorption of Phenanthrene by Biota Spores and Pollens

Modification of glycidyl methacrylate based cryogels by cellulose nanocrystals and determination of dye adsorption performance

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