Adsorption of emulsified oil from metalworking fluid on activated bleaching earth-chitosan-SDS composites: Optimization, kinetics, isotherms

Naowanat, Nitiya; Thouchprasitchai, Nutthavich; Pongstabodee, Sangobtip

doi:10.1016/j.jenvman.2015.12.024

Cited by 15 publications

(8 citation statements)

References 42 publications

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“…The amounts of fluoride adsorbed by HAP and CNT-HAP rapidly increase in the first 2 h. Then the adsorption rate slows down and reaches equilibrium at 240 and 300 min, respectively. The adsorption kinetic data were fitted by pseudo-first-order model (Equation 7), and pseudo-second-order model (Equation 8), respectively (Naowanat et al, 2016 ; Subbaiah and Kim, 2016 ; Sun et al, 2017 ).…”

Section: Resultsmentioning

confidence: 99%

Enhanced Defluoridation Capacity From Aqueous Media via Hydroxyapatite Decorated With Carbon Nanotube

Tang

Duan

et al. 2018

Front. Chem.

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In this work, the potential of a novel hydroxyapatite decorated with carbon nanotube composite (CNT-HAP) for fluoride removal was investigated. The synthesized CNT-HAP composite was systematically characterized by X-ray diffraction(XRD), Fourier Transform infrared spectroscopy(FTIR), scanning electron microscope (SEM) and Brunauer–Emmett–Teller(BET). Batch adsorption experiments were conducted to investigate the defluorination capacity of CNT-HAP. The CNT-HAP composite has a maximum adsorption capacity of 11.05 mg·g−1 for fluoride, and the isothermal adsorption data were fitted by the Freundlich model to calculate the thermodynamic parameters. Thermodynamic analysis implies that the adsorption of fluoride on CNT-HAP is a spontaneous process. Furthermore, the adsorption of fluoride follows pseudo-second-order model. The effects of solution pH, co-existing anions and reaction temperature on defluorination efficiency were examined to optimize the operation conditions for fluoride adsorption. It is found that the optimized pH-value for fluoride removal by CNT-HAP composite is 6. In addition, among five common anions studied in this work, the presence of HCO3- and PO43- could considerably affect the fluoride removal by CNT-HPA in aqueous media. Finally, the underlying mechanism for the fluoride removal by CNT-HAP is analyzed, and an anion exchange process is proposed.

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Section: Resultsmentioning

confidence: 99%

Enhanced Defluoridation Capacity From Aqueous Media via Hydroxyapatite Decorated With Carbon Nanotube

Tang

Duan

et al. 2018

Front. Chem.

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“…The first one is based on the assumption that one molecule adsorbs within the active site of the polymer [13] and it is given by Equation (7): log(Qe−Qt)=log(Qe)−K12.303t where Q e is the amount of adsorbed drug at the equilibrium time, K 1 is the first-order adsorption rate constant and t is the adsorption time.…”

Section: Resultsmentioning

confidence: 99%

Smart Bandage Based on Molecularly Imprinted Polymers (MIPs) for Diclofenac Controlled Release

et al. 2018

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The aim of the present study was the development of a “smart bandage” for the topical administration of diclofenac, in the treatment of localized painful and inflammatory conditions, incorporating Molecularly Imprinted Polymers (MIPs) for the controlled release of this anti-inflammatory drug. For this purpose, MIP spherical particles were synthesized by precipitation polymerization, loaded with the therapeutic agent and incorporated into the bandage surface. Batch adsorption binding studies were performed to investigate the adsorption isotherms and kinetics and the selective recognition abilities of the synthesized MIP. In vitro diffusion studies were also carried out using Franz cells and the obtained results were reported as percentage of the diffused dose, cumulative amount of diffused drug, steady-state drug flux and permeability coefficient. Moreover, the biocompatibility of the developed device was evaluated using the EPISKIN™ model. The Scatchard analysis indicated that the prepared MIP is characterized by the presence of specific binding sites for diclofenac, which are not present in the corresponding non-imprinted polymer, and the obtained results confirmed both the ability of the prepared bandage to prolong the drug release and the absence of skin irritation reactions. Therefore, these results support the potential application of the developed “smart bandage” as topical device for diclofenac sustained release.

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“…The pseudo‐first‐order equation relies on the assumption that one molecule adsorbs within the active site of the membrane. On the other hand, the pseudo‐second‐order equation is based on the assumption that one adsorbate molecule interacts with two active sites . The above equations are plotted in Fig.…”

Section: Resultsmentioning

confidence: 99%

Towards a new strategy of a chitosan‐based molecularly imprinted membrane for removal of 4‐nitrophenol in real water samples

Bello

Mergola

Scorrano

et al. 2017

Polymer International

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The issue of water contaminants, which affects human and environmental health, is not trivial. It is thus paramount to find new cheap and user friendly ways to detect and remove them from the environment. Here, the synthesis of a green chitosan (CS) based molecularly imprinted membrane for the detection and quantification of 4‐nitrophenol (4‐NO2Ph) in aqueous media is proposed. The concentration of 4‐NO2Ph in a water solution was measured by HPLC analysis. CS as a functional polymer, 4‐NO2Ph as template, 4‐[(4‐hydroxy)phenylazo]benzenesulfonic acid as ligand, and glutaraldehyde as crosslinker in the presence of polyethylene glycol as porogen were used. The membrane was characterized by SEM and Fourier transform IR analyses, which confirmed the CS and polyethylene glycol backbone of the membrane. Kinetic studies of the detection system were performed by using pseudo‐first‐order and pseudo‐second‐order models. Then, the binding efficiency between 195.33 µmol L−1 and 9235.55 µmol L−1 of 4‐NO2Ph was evaluated, finding a maximum adsorption of 723.25 µmol 4‐NO2Ph per gram of membrane consistent with the Qmax calculated from the Langmuir isotherm. The selectivity of the membrane versus three phenolic competitor molecules, sharing very similar molecular structure to 4‐NO2Ph, was demonstrated. Finally, the applicability of the membrane to real‐world samples was evaluated, by using drinking water spiked with 7.19 µmol L−1 of 4‐NO2Ph, obtaining a removal efficiency of 70.6%. © 2017 Society of Chemical Industry

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Adsorption of emulsified oil from metalworking fluid on activated bleaching earth-chitosan-SDS composites: Optimization, kinetics, isotherms

Cited by 15 publications

References 42 publications

Enhanced Defluoridation Capacity From Aqueous Media via Hydroxyapatite Decorated With Carbon Nanotube

Enhanced Defluoridation Capacity From Aqueous Media via Hydroxyapatite Decorated With Carbon Nanotube

Smart Bandage Based on Molecularly Imprinted Polymers (MIPs) for Diclofenac Controlled Release

Towards a new strategy of a chitosan‐based molecularly imprinted membrane for removal of 4‐nitrophenol in real water samples

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