Enhanced removal for humic-acid (HA) and coagulation process using carbon nanotubes (CNTs)/polyalumium chloride (PACl) composites coagulants

Xu, Hui; Jiao, Ruyuan; Xiao, Feng; Wang, Dongsheng

doi:10.1016/j.colsurfa.2015.11.047

Cited by 21 publications

(3 citation statements)

References 40 publications

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“…Due to the amphiphilicity of HA, it may closely interact with such kind of hydrophobic surface. The favorable interaction between HA and CNT has been reported 35 in view of the enhanced removal of HA in the presence of CNT/ polyaluminum chloride (PACl). This clearly shows that the presence of CNT affects the behavior of HA in aqueous media, and it is conceivable that the copresence of HA and CNT may lead to a different mechanism of the migration of uranyl.…”

Section: ■ Introductionmentioning

confidence: 99%

Dynamics of Humic Acid and Its Interaction with Uranyl in the Presence of Hydrophobic Surface Implicated by Molecular Dynamics Simulations

Lan

Wang

Liao

et al. 2016

Environ. Sci. Technol.

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This work targeted a molecular level of understanding on the dynamics of humic acid (HA) and its interaction with uranyl in the presence of hydrophobic surface mimicked by a carbon nanotube (CNT), which also represents a potential intruder in the environment accompanying with the development of nanotechnology. In aqueous phase, uranyl and HA were observed to build close contact spontaneously, driven by electrostatic interaction, leading to a more compact conformation of HA. The presence of CNT unfolds HA via π-π interactions with the aromatic rings of HA without significant perturbation on the interaction strength between HA and uranyl. These results show that the hydrophilic uranyl and the hydrophobic CNT influence the folding behavior of HA in distinct manners, which represents two fundamental mechanisms that the folding behavior of HA may be modulated in the environment, that is, uranyl enhances the folding of HA via electrostatic interactions, whereas CNT impedes its spontaneous folding via van der Waals (vdW) interactions. The work also provides molecular level of evidence on the transformation of a hydrophobic surface into a hydrophilic one via noncovalent functionalization by HA, which in turn affects the migration of HA and the cations it binds to.

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Section: ■ Introductionmentioning

confidence: 99%

Dynamics of Humic Acid and Its Interaction with Uranyl in the Presence of Hydrophobic Surface Implicated by Molecular Dynamics Simulations

Lan

Wang

Liao

et al. 2016

Environ. Sci. Technol.

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“…A stock solution of HA was prepared by dissolving 0.5 g of HA in 0.01 mol L À1 NaOH solution under continuous stirring for 24 h. 19 Aer that, the solution was ltered through a 0.45 mm membrane and stored at 4 C.…”

Section: Water Samplementioning

confidence: 99%

Characterization of an inorganic polymer coagulant and coagulation behavior for humic acid/algae-polluted water treatment: polymeric zinc–ferric–silicate–sulfate coagulant

et al. 2017

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Algae and algae organic matter (AOM) are not the sole pollutants in algae-polluted water. Other pollutants such as colloidal particles and natural organic matter should be simultaneously removed and might influence the treatment of algae and AOM. A new polymeric zinc-ferric-silicate-sulfate (PZFSiS) coagulant was prepared, and the relationship between its structure and performance in the treatment of humic acid (HA)/algae-polluted water was discussed. PZFSiS coagulants prepared under different conditions had different distributions of Fe(III) species. The coagulant possessing the highest Fe b content was able to treat turbidity and HA well. As a copolymer of Fe(III), Zn(II) and Si(IV), PZFSiS had a positive charge in water and thus neutralized the negative surface charges of pollutants. The adsorption of hydroxyl polymer formed by Fe/Zn during the hydrolysis process contributed to the removal of organic matter. The dosage of PZFSiS and pH significantly influenced pollutant removal. Colloidal particles in the water competed with the organic matter, markedly decreasing the removal efficiency of organic matter by coagulation.

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“…The phenolic compound is one kind of hazardous pollutant in wastewater discharged from chemical, petrochemical and pharmaceutical industries, 1 which has drawn much public concern due to its highly toxic features. Consequently, a variety of approaches, such as physical adsorption, 2 coagulation, 3 biological treatment, 4 chemical oxidation, 5 and electro-catalytic oxidation technology, 6 have been adopted to remove phenol from wastewater. Among them, the electro-catalytic oxidation technology is considered to be one of the most effective approaches for the removal of phenol due to its high efficiency, low cost, and environment-friendly features (no serious secondary pollution).…”

Section: Introductionmentioning

confidence: 99%

Highly efficient degradation of phenol from wastewater via an electro-catalytic oxidation approach with a CeO₂–CuO cathode

Luo

Zhang

2018

RSC Adv.

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Enhanced removal for humic-acid (HA) and coagulation process using carbon nanotubes (CNTs)/polyalumium chloride (PACl) composites coagulants

Cited by 21 publications

References 40 publications

Dynamics of Humic Acid and Its Interaction with Uranyl in the Presence of Hydrophobic Surface Implicated by Molecular Dynamics Simulations

Dynamics of Humic Acid and Its Interaction with Uranyl in the Presence of Hydrophobic Surface Implicated by Molecular Dynamics Simulations

Characterization of an inorganic polymer coagulant and coagulation behavior for humic acid/algae-polluted water treatment: polymeric zinc–ferric–silicate–sulfate coagulant

Highly efficient degradation of phenol from wastewater via an electro-catalytic oxidation approach with a CeO₂–CuO cathode

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Enhanced removal for humic-acid (HA) and coagulation process using carbon nanotubes (CNTs)/polyalumium chloride (PACl) composites coagulants

Cited by 21 publications

References 40 publications

Dynamics of Humic Acid and Its Interaction with Uranyl in the Presence of Hydrophobic Surface Implicated by Molecular Dynamics Simulations

Dynamics of Humic Acid and Its Interaction with Uranyl in the Presence of Hydrophobic Surface Implicated by Molecular Dynamics Simulations

Characterization of an inorganic polymer coagulant and coagulation behavior for humic acid/algae-polluted water treatment: polymeric zinc–ferric–silicate–sulfate coagulant

Highly efficient degradation of phenol from wastewater via an electro-catalytic oxidation approach with a CeO2–CuO cathode

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Highly efficient degradation of phenol from wastewater via an electro-catalytic oxidation approach with a CeO₂–CuO cathode