Insights into Adsorption of Humic Substances on Graphitic Carbon Nitride

Wang, Jianchao; Yue, Dongbei; Cui, Dongyu; Zhang, Lingyue; Dong, Xinwei

doi:10.1021/acs.est.0c07681

Cited by 55 publications

(35 citation statements)

References 75 publications

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“…After TC adsorption, there was a significant change of C = C peak shape, implying the aromatic C = C of HAs/KMBC might be combined with the benzene ring of TC. The O 1 s spectra of 10% HAs/KMBC was deconvoluted into three peaks at 530.92 eV, 532.32 eV and 532.74 eV, corresponding to the Fe–O, C–O, and C = O groups, respectively 29 , 38 . After TC uptake, the shift of C–O and C = O groups indicated that the hydroxyl and carboxyl groups of HAs/KMBC might be combined with the carbonyl and hydroxyl groups of TC, demonstrating that hydrogen bond might play a role in the adsorption process.…”

Section: Resultsmentioning

confidence: 99%

Effect of dissolved humic acids and coated humic acids on tetracycline adsorption by K2CO3-activated magnetic biochar

Wang

Huang

et al. 2022

Sci Rep

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Humic acids (HAs) widely exist in water environment, and has an important impact on the adsorption of pollutants. Herein, HAs (both dissolved and coated) was employed to assess the effect on the removal of the organic contaminant tetracycline (TC) by K2CO3 modified magnetic biochar (KMBC). Results showed that low concentration of dissolved HAs promoted TC removal, likely due to a bridging effect, while higher concentration of dissolved HAs inhibited TC adsorption because of the competition of adsorption sites on KMBC. By characterization analysis, coated HAs changed the surface and pore characteristics of KMBC, which suppressed the TC removal. In a sequential adsorption experiment involving dissolved HAs and TC, the addition of HAs at the end of the experiment led to the formation of HAs-TC ligands with free TC, which improved the adsorption capacity of TC. TC adsorption by KMBC in the presence of dissolved HAs and coated HAs showed a downward trend with increasing pH from 5.0 to 10.0. The TC adsorption process was favorable and endothermic, and could be better simulated by pseudo-second-order kinetics and Freundlich isotherm model. Hydrogen bonds and π–π interactions were hypothesized to be the underlying influencing mechanisms.

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Section: Resultsmentioning

confidence: 99%

Effect of dissolved humic acids and coated humic acids on tetracycline adsorption by K2CO3-activated magnetic biochar

Wang

Huang

et al. 2022

Sci Rep

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“…UCN and NS-DCN have less negative surface charge than other CNs, for example, DCN, TCN, and MCN. 12,52 Hemolysis Effect of CN In Vitro. The hemolysis assay was used to evaluate the cytotoxic effect of CN on biological membranes.…”

Section: ■ Materials and Methodsmentioning

confidence: 99%

“…2,3 Physical disruptions of the cell membrane are dominated by direct contact with nanoparticles, and lipid bilayers are damaged through mechanical rupture or adsorption extraction of lipid molecules. 8−10 Recently, graphitic carbon nitride (g-C 3 N 4 , CN) has attracted considerable attention in a variety of fields, including environmental remediation, 11,12 energy conversion, 11,13 and biomedicine, 14,15 due to its unique nanostructure and physical properties. 16 With the promising future of CN in various applications, it is necessary to assess its biocompatibility and possible nanotoxicity.…”

Section: ■ Introductionmentioning

confidence: 99%

“…The cytotoxicity of CNMs is highly dependent on their extrinsic physiochemical properties, including chemical nature, solubility, size, surface, shape, aggregation, and functionalization. 6,7,20 Similarly, CN prepared by different precursors or pathways would exhibit a distinct difference in structure, morphology, and physiochemical properties, 12,16 which might lead to the different toxicological effects of CN that should be clarified. 18 Meanwhile, CN is inevitably exposed to sunlight or artificial light during the application and disposal processes.…”

Section: ■ Introductionmentioning

confidence: 99%

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Interaction of Graphitic Carbon Nitride with Cell Membranes: Probing Phospholipid Extraction and Lipid Bilayer Destruction

Feng

Lao

Zou

et al. 2022

Environ. Sci. Technol.

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Understanding how nanomaterials interact with cell membranes has important implications for ecotoxicology and human health. Here, we investigated the interactions between graphitic carbon nitride (g-C3N4, CN) and red blood cells, a plausible contact target for nanoparticles when they enter the bloodstream. Through a hemolysis assay, the cytotoxicity of CN derived from different precursors was quantitatively assessed, which is highly related to the surface area of CN. Reactive oxygen species (ROS) generation and lipid peroxidation detection confirmed that CN causes rapid cell membrane rupture by a physical interaction mechanism rather than ROS-related chemical oxidation. Dye leakage assay and theoretical simulation indicated that the less-layered CN is prone to folding inward to wrap and extract lipid molecules from cell membranes. The electron-rich inherent pores of CN play a dominant role in capturing the headgroups of phospholipids, whereas the hydrophobic interaction is critical for the anchoring of lipid tails. Our further experimental evidence demonstrated that the destructive extraction of phospholipids from cell membranes by CN occurs primarily in the outer leaflet, and phosphatidylcholine is the most easily extracted lipid. Moreover, the formation of protein corona on CN was found to decrease the nonspecific interactions but increase steric repulsion, thus mitigating CN cytotoxicity. Overall, our data provide a molecular basis for CN’s cytotoxicity.

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“…The existence of humic substances will bring a series of problems in textile dyeing wastewater treatment. For example, increasing the chroma of water, [ 40 ] causing the blockage and reducing the utilization of membrane, [ 41,42 ] reducing the adsorption capacity of activated carbon, [ 43 ] leading to the breeding and reproduction of microorganisms in the drainage network, [ 44 ] reducing the pipeline life, and generating toxic by‐products by combining with chlorine in the disinfection process. [ 45 ] We chose humic acid (HA) solution to simulate the main dissolved organic matters in textile dyeing wastewater.…”

Section: Introductionmentioning

confidence: 99%

Study on the Flocculation Performance of a Cationic Starch‐Based Flocculant on Humic Substances in Textile Dyeing Wastewater

et al. 2022

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Dissolved organic matter is one of the difficult problems in the treatment of textile dyeing wastewater, among which humic substances are the most harmful to the environment and human health. Herein, cationic starch‐based flocculants are prepared by free radical polymerization of corn starch (St) and methacryloyloxyethyl trimethyl ammonium chloride (DMC) in a redox‐initiated system of ammonium persulfate and sodium bisulfite. Corn starch‐graft‐poly(methacryloyloxyethyl trimethyl ammonium chloride) is denoted as St‐g‐PDMC. The St‐g‐PDMC is comprehensively characterized in terms of structural (element analysis, Fourier transform infrared, X‐ray diffraction, proton nuclear magnetic resonance spectroscopy), morphological (scanning electron microscopy), and thermal (differential scanning calorimetry) properties. Humic acid (HA) solution is selected to simulate negatively charged dissolved organic matter. The flocculation performance and mechanism of St‐g‐PDMC, cationic polyacrylamide (CPAM), and polymerized aluminum chloride (PAC) are systematically investigated. The experimental results show that St‐g‐PDMC functions mainly through the electric neutralization and bridging effect as the flocculation mechanism, CPAM using its own structure and the colloid formed by PAC through hydrolysis is more in line with the bonded bridging and net roll sweep trapping. The combined formulation of St‐g‐PDMC and PAC shows advantages over a single flocculant in the treatment of textile dyeing wastewater, and its cost is evaluated.

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Insights into Adsorption of Humic Substances on Graphitic Carbon Nitride

Cited by 55 publications

References 75 publications

Effect of dissolved humic acids and coated humic acids on tetracycline adsorption by K2CO3-activated magnetic biochar

Effect of dissolved humic acids and coated humic acids on tetracycline adsorption by K2CO3-activated magnetic biochar

Interaction of Graphitic Carbon Nitride with Cell Membranes: Probing Phospholipid Extraction and Lipid Bilayer Destruction

Study on the Flocculation Performance of a Cationic Starch‐Based Flocculant on Humic Substances in Textile Dyeing Wastewater

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