Adsorption of nitrate using diatomite-supported ferric oxide nanoparticles: determination of optimum condition, kinetics, and adsorption isotherms

Dehestaniathar, Saeed; Amini, Shouresh; Maleki, Afshin; Shahmorad, Behzad; Reshadmanesh, Naser; Teymouri, Pari

doi:10.5004/dwt.2017.20280

Cited by 2 publications

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“…Also, a similar study carried out by Harman and Genisoglu in 2016 on copper removal by P-nZVI yielded similar results [41]. In a study conducted by Dehestaniathar et al on the uptake of fluoride by iron oxide nanoparticles stabilized on diatomite, the uptake increased with increasing adsorption [42].…”

Section: Absorbent Effectmentioning

confidence: 53%

“…In a study conducted by Shokoohi et al to investigate the removal of phenol by pumice-coated iron from aqueous solutions, the efficiency first increased and then decreased with increasing contaminant concentration due to a decrease in adsorption capacity by the adsorbent [43]. Also, in another study conducted by Dehestaniathar et al to adsorb fluoride by iron oxide nanoparticles stabilized on diatomite, the removal efficiency decreased with increasing fluoride concentration [42].…”

Section: Effect Of Initial Paraquat Concentrationmentioning

confidence: 99%

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Comparison of Paraquat Herbicide Removal from Aqueous Solutions using Nanoscale Zero-Valent Iron-Pumice/Diatomite Composites

Khodabakhshi

Mohammadi‐Moghadam

Amin

et al. 2021

International Journal of Chemical Engineering

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Paraquat is the most important herbicide of the bipyridyl group. The aim of the present study was to compare the removal of paraquat herbicide from aqueous solutions using nanoscale zero-valent iron-pumice/diatomite composites. In this study, nZVI was supported with diatomite and pumice. Scanning electron microscopy (SEM) analysis, X-ray diffraction spectroscopy (XRD), Fourier transform infrared spectrometry (FTIR), and specific surface area tests (BET) were used to evaluate the properties of nanoadsorbents. The residual concentration of paraquat in aqueous solution was detected by high-performance liquid chromatography (HPLC). Then, the effects of different variables including the pollutant concentration, contact time, temperature, adsorbents (D-nZVI and P-nZVI) dose, and pH, were investigated in a lab scale batch system. The results showed that the optimal pH for both processes was 3.74. In optimal conditions, the efficiencies of D-nZVI and P-nZVI were 92.76% and 85.28%, respectively. In addition, isotherm and adsorption kinetics studies indicated that P-nZVI follows the Langmuir and Freundlich isotherm models, and D-nZVI follows the Langmuir isotherm model, and both processes follow pseudo-second-order kinetics. The results indicated that the synthesized nanoparticles were suitable for removing paraquat from aqueous solutions. Both adsorbents were found to be very effective in removing similar compounds at ambient temperature in a short time.

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Section: Absorbent Effectmentioning

confidence: 53%

Section: Effect Of Initial Paraquat Concentrationmentioning

confidence: 99%