Sorption of norfloxacin onto humic acid extracted from weathered coal

Zhang, Qin; Zhao, Ling; Dong, Yuanhua; Huang, Guan-yi

doi:10.1016/j.jenvman.2011.12.036

Cited by 53 publications

(8 citation statements)

References 54 publications

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“…The Langmuir parameters recorded in absence of Cu 2+ in function of pH are reported in Table 8. This pH dependence is in line with a previous report [100], according to which the primary sorption mechanism of Nor onto HA is the cation exchange.…”

Section: Elovich Parameters Freundlich Parameterssupporting

confidence: 93%

Sorption of Organic Pollutants by Humic Acids: A Review

et al. 2020

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Humic acids (HA) are promising green materials for water and wastewater treatment. They show a strong ability to sorb cationic and hydrophobic organic pollutants. Cationic compounds interact mainly by electrostatic interaction with the deprotonated carboxylic groups of HA. Other functional groups of HA such as quinones, may form covalent bonds with aromatic ammines or similar organic compounds. Computational and experimental works show that the interaction of HA with hydrophobic organics is mainly due to π–π interactions, hydrophobic effect and hydrogen bonding. Several works report that sorbing efficiency is related to the hydrophobicity of the sorbate. Papers about the interaction between organic pollutants and humic acids dissolved in solution, in the solid state and adsorbed onto solid particles, like aluminosilicates and magnetic materials, are reviewed and discussed. A short discussion of the thermodynamics and kinetics of the sorption process, with indication of the main mistakes reported in literature, is also given.

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Section: Elovich Parameters Freundlich Parameterssupporting

confidence: 93%

Sorption of Organic Pollutants by Humic Acids: A Review

et al. 2020

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“…Although the pseudo second-order kinetic model is based on the assumption that the adsorption is chemically achieved, 33 several studies reported good fits with this model despite the driving force for the adsorption follows other mechanisms. [34][35][36] It seems that the pseudofirst and the Bangham equations do not fit well with experimental data. The modeling of cationic PhACs adsorption kinetic is impossible due to their total adsorption since the first sample(i.e.…”

Section: Kinetics Experiments and Modelingmentioning

confidence: 94%

Competitive adsorption of a pool of pharmaceuticals onto a raw clay mineral

et al. 2016

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International audienceThe removal of a Pharmaceutically Active Compound (PhAC) pool using a well referenced clay mineral from Wyoming (SWy-2) as geosorbent was studied for a better understanding of their environmental fate. As expected, the selected material shows its particular adsorption properties to PhAC under different experimental conditions with two main features depending on the chemical nature of the emerging micro-pollutants. Cationic PhACs, for which the driving force for their adsorption results to electrostatic interaction via the exchange with the inorganic cations of the clay mineral, are almost completely removed for all studied experimental conditions where it appears that S/L ratio plays a minor role and the only one limitation for their removal is the cation exchange capacity of the adsorbent. In contrast, anionic and neutral PhACs are adsorbed to the clay mineral surface (silanol groups on the sheet edges, inorganic cations…) through other interactional mechanisms involving ion-dipole, Van der Waals interaction, leading to a competition of the whole organic molecules where their chemical nature (electric charge, hydrophobicity) may also play for their adsorption. While the adsorption of ketoprofen, naproxen, diclofenac and salicylic acid anionic PhACs slightly increases with the increase of the S/L ratio, the removal of the neutral and the other anionic PhACs (gemfibrozil and ibuprofen) seems to be independent of that ratio and is particularly enhanced. The efficiency of the removal for a global pool of PhACs even in low S/L ratio stresses out the control of the selected natural minerals on the dynamic of PhACs in the environment

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“…18,[21][22][23] In addition, the main adsorption mechanisms of antibiotics on HA include hydrophobic binding, ion exchange and hydrogen bonding. 16,24,25 The pollution caused by antibiotics is especially prominent, but the adsorption mechanisms of antibiotics in environmental media are insufficient. Identifying the adsorption properties and sorption mechanisms of antibiotics with different mechanisms can effectively predict their environmental behaviour.…”

Section: Introductionmentioning

confidence: 99%