Effect of humic acid source on humic acid adsorption onto titanium dioxide nanoparticles

Erhayem, Mohamed; Sohn, Mary

doi:10.1016/j.scitotenv.2013.09.063

Cited by 65 publications

(34 citation statements)

References 33 publications

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“…Therefore, DS samples were to be acceptable for most application such as adsorption of heavy metals from aqueous solutions. This result is in good agreement with previous research [11].…”

Section: International Journal Of Chemicalsupporting

confidence: 94%

Effect of Activated Carbon Source from Date Stone on Its Physico-Chemical Properties

Erhayem¹,

Mohamed²,

Ghmeid³

et al. 2016

IJCEA

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“…Therefore, DS samples were to be acceptable for most application such as adsorption of heavy metals from aqueous solutions. This result is in good agreement with previous research [11].…”

Section: International Journal Of Chemicalsupporting

confidence: 94%

Effect of Activated Carbon Source from Date Stone on Its Physico-Chemical Properties

Erhayem¹,

Mohamed²,

Ghmeid³

et al. 2016

IJCEA

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“…5f). It was reported that HA tended to stabilize the TiO 2 NPs in 0.1 mol/L NaCl electrolyte, but accelerated the sedimentation in Milli-Q water (Erhayem and Sohn, 2014). The latter result is consistent with our TEM observation that HA causes the most condensed agglomerates (Fig.…”

Section: Sedimentation Kinetics Of Nps Measured By Optical Absorbancesupporting

confidence: 93%

Effects of humic acid and bovine serum albumin on the agglomeration and sedimentation of oxide nanoparticles

Lin

Chen

et al. 2014

J. Zhejiang Univ. Sci. A

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Abstract:To better understand the nanoparticle (NP) transport in the environment, the agglomeration and sedimentation of Al 2 O 3 , SiO 2 , and TiO 2 NPs were evaluated after being treated with bovine serum albumin (BSA) and a commercial humic acid (HA). The morphology of NP agglomerates was examined through a transmission electron microscope (TEM), and the agglomeration kinetics was evaluated using established time-resolved dynamic light scattering techniques. BSA treatments decreased the hydrodynamic diameters (d H ) of the three NPs in both NaCl and CaCl 2 electrolytes due to their steric repulsive forces caused by the BSA globular architecture. The treatments using HA induced the smallest d H of NPs in NaCl electrolyte, but the largest d H of NPs was found in CaCl 2 electrolyte, because the HA bound to each other via calcium complexation and thereby enhanced the NP agglomeration. The zeta potentials of NPs were not the dominant factor to affect agglomeration. The NP sedimentation kinetics were studied through measuring the suspension optical absorbance. It was shown that the BSA treatments retarded the sedimentation in most situations; however, HA treatments accelerated the sedimentation greatly in CaCl 2 electrolyte, which was consistent with the measured changes in the d H values. The smallest d H of HA-treated NPs in NaCl electrolyte did not result in the lowest sedimentation rate, which indicated that the agglomeration size was not the only factor to affect the NP sedimentation.

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“…The AA data indicated no significant changes in the adsorption of Cr(VI) and Cu(II) ions on the PKP that occurred after 60 min due to the repulsive forces between the metal ions on the solid and liquid phases. This result is in good agreement with previous research [7], [8]. Therefore, 70 min was chosen as the time at which the adsorption of Cr(VI) and Cu(II) ions onto the PKP was attained.…”

Section: Resultssupporting

confidence: 91%

“…Freundlich isotherm assumes that the uptakes of metal ions occur on a heterogeneous surface by multilayer adsorption and that the amount of adsorbate adsorbed increases infinitely with an increase in concentration. This isotherm does not predict any saturation of the sorbent by the sorbate thus infinite surface coverage is predicted mathematically, indicating a multilayer sorption of the surface using the following equation [7], [16], [17].…”

Section: International Journal Of Environmentalmentioning

confidence: 89%

Biosorption of Cr(VI) and Cu(II) by Palm Kernel Powder and Its Potential Application

Mohamed¹,

Mustafa²,

Erhayem³

2016

IJESD

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Abstract-In this research, palm kernel powder (PKP) was utilized as a bioadsorbent for the removal of Cr(VI) and Cu(II) ions from aqueous solutions. Batch studies were preformed to evaluate the effect of various experimental parameters on Cr(VI) and Cu(II) adsorption onto PKP. The adsorption equilibrium was reached after 70 min. The adsorption capacity of Cr(VI) and Cu(II) was pH-dependent showing a maximum at equilibrium pH 2 and 5, respectively. The percentage removal of heavy metals by PKP varied in order unmodified adsorbents>HNO3>H3PO4. The adsorption isotherm and kinetics of Cr(VI) and Cu(II) were also investigated using Langmuir and Freundlich adsorption isotherm models and pseudo-first order (LSO) and pseudo-second-order (PSO) kinetic models. The data was better described by Freundlich adsorption isotherm model and PSO kinetics in the concentration range studied. For environmental study, it was found that the adsorption capacity for heavy metals decreased in the raw waste water sample in comparison with the synthetic waste water system.

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Effect of humic acid source on humic acid adsorption onto titanium dioxide nanoparticles

Cited by 65 publications

References 33 publications

Effect of Activated Carbon Source from Date Stone on Its Physico-Chemical Properties

Effect of Activated Carbon Source from Date Stone on Its Physico-Chemical Properties

Effects of humic acid and bovine serum albumin on the agglomeration and sedimentation of oxide nanoparticles

Biosorption of Cr(VI) and Cu(II) by Palm Kernel Powder and Its Potential Application

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