Adsorption of sulfamethoxazole (SMZ) and ciprofloxacin (CIP) by humic acid (HA): characteristics and mechanism

Liu, Xiaohui; Lu, Shaoyong; Liu, Ying; Meng, Wei; Zheng, Binghui

doi:10.1039/c7ra06231a

Cited by 84 publications

(23 citation statements)

References 42 publications

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“…Previous studies found that the adsorption kinetics of organic compounds on soil or soil organic matter conforms to the quasi-second-order kinetic equation. 26,[37][38][39][40] The adsorption kinetics of nitrapyrin on HA, FA and HA + FA t the quasisecond-order kinetic equation best (P < 0.05), and the t equilibrium adsorption capacity was consistent with the experimental results (Table 2). The quasi-second-order kinetic equation tting effect of nitrapyrin on HA + FA was better than on HA or FA, and that of HA was better than that of FA.…”

Section: Adsorption Kinetics Of Nitrapyrin On Ha and Fasupporting

confidence: 75%

“…For the adsorption of organic compounds on HA or FA, generally, the Langmuir isotherm parameters increase with an increase of reaction temperature. [39][40][41] The increase of temperature promoted the diffusion of nitrapyrin molecules, reduced the solution viscosity, and promoted the entry of nitrapyrin molecules into This article is licensed under a Creative Commons Attribution-NonCommercial 3.0 Unported Licence.…”

Section: Thermodynamics Of Nitrapyrin On Ha and Famentioning

confidence: 99%

“…(4) Adsorption mechanism HA and FA are the main components of soil organic matter, and they contain various organic functional groups such as carboxyl and hydroxyl groups and so on . 39 The Fig. 5 Plausible interaction mechanism between HA, FA and nitrapyrin.…”

Section: Adsorption Mechanism Of Nitrapyrin On Ha and Fa (1) Sem Analmentioning

confidence: 99%

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Adsorption of nitrification inhibitor nitrapyrin by humic acid and fulvic acid in black soil: characteristics and mechanism

et al. 2021

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Section: Adsorption Kinetics Of Nitrapyrin On Ha and Fasupporting

confidence: 75%

Section: Thermodynamics Of Nitrapyrin On Ha and Famentioning

confidence: 99%

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Adsorption of nitrification inhibitor nitrapyrin by humic acid and fulvic acid in black soil: characteristics and mechanism

et al. 2021

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“…On the other hand, the sorption energy decreased with the increasing of CIP loading, hence, CIP molecules first occupied the high-energy sorption sites at low concentration and then spread to low-energy sorption sites [ 42 , 68 ]. Furthermore, recent studies have reported that the removal of pharmaceuticals by anaerobic sludge occurs initially by sorption, but after the equilibrium being reached, the mass-transfer driving force no longer affects the pharmaceutical uptake due to the absence of a concentration gradient.…”

Section: Resultsmentioning

confidence: 99%

“…Furthermore, recent studies have reported that the removal of pharmaceuticals by anaerobic sludge occurs initially by sorption, but after the equilibrium being reached, the mass-transfer driving force no longer affects the pharmaceutical uptake due to the absence of a concentration gradient. Being the biodegradation mechanism the major removal route in the system [ 10 , 53 , 68 , 69 , 70 , 71 , 72 ].…”

Section: Resultsmentioning

confidence: 99%

Detoxification of Ciprofloxacin in an Anaerobic Bioprocess Supplemented with Magnetic Carbon Nanotubes: Contribution of Adsorption and Biodegradation Mechanisms

Silva

Cavaleiro

Soares

et al. 2021

IJMS

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In anaerobic bioreactors, the electrons produced during the oxidation of organic matter can potentially be used for the biological reduction of pharmaceuticals in wastewaters. Common electron transfer limitations benefit from the acceleration of reactions through utilization of redox mediators (RM). This work explores the potential of carbon nanomaterials (CNM) as RM on the anaerobic removal of ciprofloxacin (CIP). Pristine and tailored carbon nanotubes (CNT) were first tested for chemical reduction of CIP, and pristine CNT was found as the best material, so it was further utilized in biological anaerobic assays with anaerobic granular sludge (GS). In addition, magnetic CNT were prepared and also tested in biological assays, as they are easier to be recovered and reused. In biological tests with CNM, approximately 99% CIP removal was achieved, and the reaction rates increased ≈1.5-fold relatively to the control without CNM. In these experiments, CIP adsorption onto GS and CNM was above 90%. Despite, after applying three successive cycles of CIP addition, the catalytic properties of magnetic CNT were maintained while adsorption decreased to 29 ± 3.2%, as the result of CNM overload by CIP. The results suggest the combined occurrence of different mechanisms for CIP removal: adsorption on GS and/or CNM, and biological reduction or oxidation, which can be accelerated by the presence of CNM. After biological treatment with CNM, toxicity towards Vibrio fischeri was evaluated, resulting in ≈ 46% detoxification of CIP solution, showing the advantages of combining biological treatment with CNM for CIP removal.

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Simultaneous Analysis of Multiclass Contaminants of Emerging Concern in Sediments by Liquid Chromatography with Tandem Quadrupole Mass Spectrometry

Rashid

Wang

et al. 2019

Environmental Toxicology and Chemistry

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A quick, easy, cheap, effective, rugged, and safe (QuEChERS)‐based extraction and simultaneous dispersive solid‐phase extraction (dSPE) clean‐up method was developed for contaminants of emerging concern (CECs) in sediment samples. Hydration with a phosphate buffer (pH 2.0) and salting out with NaCl and MgSO4 facilitated the extraction and liquid–liquid portioning of the aqueous and organic phases. Cleanup of the extracts was achieved by florisil and C18 (1:1) sorbents in dSPE with minimal compromise of the analytes. The extracts were clean enough for determination by liquid chromatography–tandem mass spectrometry (LC‐MS/MS). The procedure was validated for preservatives, blood lipid regulators, analgesics and anti‐inflammatory drugs, plasticizers, and other classes of CECs in sediment matrix spiked at 6 levels between 1‐ and 40‐fold concentrations for CECs of varying analytical sensitivities. The recovery values were generally between approximately 27 and 120% and the relative standard deviation (%RSD) values were below 20% at 10‐ , 20‐ , and 40‐fold spiking levels, albeit the recoveries for some analytes dropped at low spike concentrations. The method showed high sensitivity where the method detection limits (MDLs) were at low ppb levels for the majority of the analytes that ranged between 0.002 and 1.93 µg/kg. The method performance was also compared with well‐established US Environmental Protection Agency (USEPA) Method 1694 by analyzing sediment samples collected from Yundang Lagoon (Xiamen, China) with field‐incurred CEC residues. The sediment samples were detected with residues of parabens, gemfibrozil, ketoprofen, naproxen, fenoprofen, diclofenac, miconazole, carbamazepine, benzophenon‐3, glibenclamide, sildinafil citrate, and some bisphenol analogues. Environ Toxicol Chem 2019;38:1409–1422. © 2019 SETAC

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Adsorption of sulfamethoxazole (SMZ) and ciprofloxacin (CIP) by humic acid (HA): characteristics and mechanism

Abstract: The adsorption behavior and mechanisms of single adsorption and co-adsorption of ciprofloxacin and sulfamethoxazole with HA were studied in detail.

Cited by 84 publications

References 42 publications

Adsorption of nitrification inhibitor nitrapyrin by humic acid and fulvic acid in black soil: characteristics and mechanism

Adsorption of nitrification inhibitor nitrapyrin by humic acid and fulvic acid in black soil: characteristics and mechanism

Detoxification of Ciprofloxacin in an Anaerobic Bioprocess Supplemented with Magnetic Carbon Nanotubes: Contribution of Adsorption and Biodegradation Mechanisms

Simultaneous Analysis of Multiclass Contaminants of Emerging Concern in Sediments by Liquid Chromatography with Tandem Quadrupole Mass Spectrometry

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