N-doped activated carbon for high-efficiency ofloxacin adsorption

He, Song; Chen, Qilin; Chen, Guan-Yu; Shi, Guibin; Ruan, Chichi; Feng, Mengmeng; Ma, Yuansheng; Jin, Xin; Liu, Xinyu; Du, Chunhua; He, Chunxiang; Dai, Huaming; Cao, Chengyang

doi:10.1016/j.micromeso.2022.111848

Cited by 46 publications

(19 citation statements)

References 80 publications

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“…In the near-neutral range, groups such as –OH and –NH 2 in the OFX molecular structure could form hydrogen bonds with the oxygen-containing functional groups protonated on the FMBC surface to promote adsorption. 53 In addition, the OFX molecules that contained zwitterions had the lowest solubility and the highest hydrophobicity and that promoted the OFX molecules to fast reach FMBC surfaces, 54 which resulted in the highest OFX adsorption at pH 7 under hydrogen bonding and hydrophobic interactions. As the pH continued to increase from 7 to 12, the adsorption capacity of FMBC was significantly decreased due to the greater electrostatic repulsion between the negatively charged surface of FMBC and OFX − and the large amount of OH − in the solution prevented OFX from entering the FMBC surface.…”

Section: Resultsmentioning

confidence: 99%

“…6(a), in terms of coexisting anions, the addition of SO 4 2− had a small enhancement on the adsorption, which may be due to ionic hydrolysis reactions and the formation of a small amount of hydrogen bonds. 53,56 The addition of Cl − had little effect on the adsorption capacity, and when the Cl − concentration was 0.01 mol L −1 , it promoted the adsorption process, probably because the solubility of OFX was reduced by salting out, and therefore the adsorption capacity was enhanced. 56 However, the addition of NO 3 − , CO 3 2− , and PO 4 3− showed a significant decrease in the adsorption capacity.…”

Section: Resultsmentioning

confidence: 99%

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A stable Fe/Co bimetallic modified biochar for ofloxacin removal from water: adsorption behavior and mechanisms

Hao

et al. 2022

RSC Adv.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

A stable Fe/Co bimetallic modified biochar for ofloxacin removal from water: adsorption behavior and mechanisms

Hao

et al. 2022

RSC Adv.

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“…The BET isotherm was calculated by Eqs. 1 and 2 leading to the general adsorption isotherm GAI 25, 26.

true normalGAI = N (\frac{p}{p_{0}}) = \int_{{normalW}_{normalmin}}^{{normalW}_{normalmax}} N (\frac{p}{p_{0}}, W) f (W) normald W

true normalGAI = \frac{1}{[W (\frac{p}{p_{0}}) - 1]}

…”

Section: Methodsmentioning

confidence: 99%

“…The BET isotherm was calculated by Eqs. ( 1) and ( 2) leading to the general adsorption isotherm GAI [25,26].…”

Section: Porosity and Adsorption Measurements Based On Brunauer-emmet...mentioning

confidence: 99%

Removal of Phenol from Sour Water by Poly(vinyl Alcohol)/Polyamide‐Reverse Osmosis Membranes

et al. 2022

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A commercial thin‐film membrane (unmodified) of polyamide improved by poly(vinyl alcohol) (PVA)‐coated membranes (modified) was investigated for separating phenol in sour water by reverse osmosis. Dependences of pressure and pore surface area on flux and phenol rejection were tested. A graphical correlation was found between the relative flux decline and phenol concentration decrease in the feed. The modified membrane provided rejection of 86 % at 2 bar with the highest permeate flux of 8.46 L m−2h−1. The average contact angle for the former membrane was 58.4°, while that for the modified membrane was 49.1°. The reduction in contact angle enhances the surface hydrophilicity of the membrane leading to the antifouling effect. The modified membrane provides 95.4 % flux recovery compared to the unmodified membrane that provides only 66.2 %.

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“…Therefore, the analysis of experimental data with these models provides important information for the design of the adsorption process as an operation unit and attributes further comprehension into the mechanism of the adsorption process and economic considerations [25][26][27] . In general, experimental data obtained in the adsorption of phenol by various adsorbents have been discussed using Freundlich, Langmuir, Dubinin-Radushkevich, Temkin, and Liu models 28,29 . However, the interpretation of phenol adsorption properties using these models is limited due to the disability of these models to understand the complete adsorption process and the parameters affecting the process.…”

Section: Toward a Mechanistic Understanding Of Adsorption Behavior Of...mentioning

confidence: 99%

Toward a mechanistic understanding of adsorption behavior of phenol onto a novel activated carbon composite

Allahkarami

Monfared

Silva

et al. 2023

Sci Rep

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In this research, the solid–liquid adsorption systems for MSAC (PbFe2O4 spinel-activated carbon)-phenol and pristine activated carbon-phenol were scrutinized from the thermodynamics and statistical physics (sta-phy) viewpoints. Experimental results indicated that MSAC composite outperformed pristine AC for the uptake of phenol from waste streams. By increasing the process temperature, the amount of phenol adsorbed onto both adsorbents, MSAC composite and pristine AC, decreased. Thermodynamic evaluations for MSAC demonstrated the spontaneous and exothermic characteristics of the adsorption process, while positive values of ΔG for pristine AC indicated a non-spontaneous process of phenol adsorption in all temperatures. In a mechanistic investigation, statistical physics modeling was applied to explore the responsible mechanism for phenol adsorption onto the MSAC composite and pristine AC. The single-layer model with one energy was the best model to describe the experimental data for both adsorbents. The adsorption energies of phenol onto both adsorbents were relatively smaller than 20 kJ/mol, indicating physical interactions. By increasing temperature from 298 to 358 K, the value of the absorbed amount of phenol onto the MSAC composite and pristine AC at saturation (Qsat) decreased from 158.94 and 138.91 to 115.23 and 112.34 mg/g, respectively. Mechanistic studies confirm the significant role of metallic hydroxides in MSAC to facilitate the removal of phenol through a strong interaction with phenol molecules, as compared with pristine activated carbon.

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N-doped activated carbon for high-efficiency ofloxacin adsorption

Cited by 46 publications

References 80 publications

A stable Fe/Co bimetallic modified biochar for ofloxacin removal from water: adsorption behavior and mechanisms

A stable Fe/Co bimetallic modified biochar for ofloxacin removal from water: adsorption behavior and mechanisms

Removal of Phenol from Sour Water by Poly(vinyl Alcohol)/Polyamide‐Reverse Osmosis Membranes

Toward a mechanistic understanding of adsorption behavior of phenol onto a novel activated carbon composite

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