Atrazine removal from water by polycation–clay composites: Effect of dissolved organic matter and comparison to activated carbon

Zadaka, Dikla; Nir, Shlomo; Radian, Adi; Mishael, Yael G.

doi:10.1016/j.watres.2008.10.050

Cited by 96 publications

(49 citation statements)

References 23 publications

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“…16,21,22 Efficient removal of atrazine by poly-4-vinylpyridine-co-styrene (PVPcoS)-clay composites was demonstrated. 16 The high binding affinity of atrazine to this composite was explained in terms of compatibility between the herbicide and the polymer. Column filters of the composite removed 93−96% of atrazine even in the presence of DOM, whereas GAC filters removed 75−83% which decreased in the presence of DOM to 52− 68%.…”

Section: ■ Introductionmentioning

confidence: 99%

“…Column filters of the composite removed 93−96% of atrazine even in the presence of DOM, whereas GAC filters removed 75−83% which decreased in the presence of DOM to 52− 68%. 16 Pyrene adsorption to clay minerals has been widely studied. 24,25 In contrast; its adsorption to clays modified with organic cations (organoclays) has been sparsely evaluated.…”

Section: ■ Introductionmentioning

confidence: 99%

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Effect of Humic Acid on Pyrene Removal from Water by Polycation-Clay Mineral Composites and Activated Carbon

Radian

Mishael

2012

Environ. Sci. Technol.

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Pyrene removal by polycation-montmorillonite (MMT) composites and granulated activated carbon (GAC) in the presence of humic acid (HA) was examined. Pyrene, HA, and sorbent interactions were characterized by FTIR, fluorescence and zeta measurements, adsorption, and column filtration experiments. Pyrene binding coefficients to the macromolecules were in the order of PVPcoS (poly-4-vinylpiridine-co-styrene) > HA > PDADMAC (poly diallyl-dimethyl-ammonium-chloride), correlating to pyrene-macromolecules compatibility. Electrostatic interactions explained the high adsorption of HA to both composites (∼100%), whereas HA adsorption by GAC was low. Pyrene removal by the composites, unlike GAC, was enhanced in the presence of HA; removal by PDADMAC-MMT increased from ∼50 (k d = 2.2 × 10 3 kg/L) to ∼70% (k d = 2.4 × 10 3 kg/L) in the presence of HA. This improvement was attributed to the adsorption of pyrene-HA complexes. PVPcoS-MMT was most efficient in removing pyrene (k d = 1.1 × 10 4 kg/L, >95% removal) which was explained in terms of specific π donor−π acceptor interactions. Pyrene uptake by column filters of GAC reached ∼50% and decreased to ∼30% in the presence of HA. Pyrene removal by the PVPcoS-MMT filter was significantly higher (100−85% removal), exhibiting only a small decrease in the presence of HA. The utilization of HA as an enhancing agent in pollutant removal is novel and of major importance in water treatment. ■ INTRODUCTIONPolycyclic aromatic hydrocarbons (PAHs) are a group of persistent hydrophobic contaminants that have been detected in aquatic systems all over the world and are included in the US EPA and the EU priority list of pollutants (e.g., benzo(a)pyrene limit in water is 0.0002 mg/L). 1,2 Fate and transport of hydrophobic organic pollutants (including PAHs) in the environment is strongly affected by interactions with dissolved organic matter (DOM). 3−5 These interactions depend on both the chemical and structural characteristics of the pollutant and of the DOM and on the characteristics of the environmental system. 6 Studies have shown that in environmental systems the fate of organic contaminants can vary greatly in terms of adsorption or mobility. Several studies have demonstrated higher solubility and mobility of the pollutants in the presence of DOM. 7−9 For example, a study on enhanced organic pollutant solubility by DOM demonstrated increased partitioning coefficients into DOM with a decrease in pollutant water solubility and DOM polarity. 7 On the other hand, other studies have shown that the presence of DOM increased sorption and immobilization of organic pollutants to soil sediments and solid surfaces. 9−11 RavAcha and Rebhun 1992 suggested that DOM tended to solubilize organic pollutants when the adsorption coefficients (of the DOM) to the clay were relatively low, while adsorption of the pollutants to the clay increased as the DOM adsorption coefficients to the clay increased. 9 A later study also emphasized this complex behavior; the adsorption of an insecticide to soils d...

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Section: ■ Introductionmentioning

confidence: 99%

Section: ■ Introductionmentioning

confidence: 99%

Effect of Humic Acid on Pyrene Removal from Water by Polycation-Clay Mineral Composites and Activated Carbon

Radian

Mishael

2012

Environ. Sci. Technol.

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“…Atrazine (2-chloro-4-ethylamino-6-isopropylaminos-triazine) is a compound with widespread usage, capable of persisting in soils, low sediment partitioning, slow rate of degradation and high tendency to be transported with water [42]. It has therefore been detected at high concentrations in ground-and surface waters [43][44][45][46].…”

Section: Introductionmentioning

confidence: 99%

Inside-Needle Extraction Method Based on Molecularly Imprinted Polymer for Solid-Phase Dynamic Extraction and Preconcentration of Triazine Herbicides Followed by GC–FID Determination

et al. 2012

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An inside-needle extraction method was developed through thermal polymerization of atrazinemolecularly imprinted polymer (MIP) on the internal surface of a stainless steel hollow needle, which was oxidized and silylated. The fabricated coating (MIP layer) for the needle was durable and showed very good chemical and thermal stability. It could be mounted on a glass syringe and be directly coupled with gas chromatographic (GC) systems. The parameters being effective on the coating and extraction processes, namely nature of oxidizing agent, silylation time, nature and amount of porogen, template-to-MIP components ratio, polymerization time and temperature, sample volume, flow rate, pH and ionic strength of the sample were investigated and optimized. The extraction needle showed high selectivity as well as a great extraction capacity for triazines. The extraction of atrazine, simazine, cyanazine, ametryn, prometryn and terbutryn using the fabricated extraction needle and followed by GC analysis resulted in detection limits of 2.6, 21, 24, 32, 38 and 42 ng mL -1 , respectively. The fabricated needle proved to be applicable to the analysis of real samples by comparing the results obtained for non-spiked and spiked samples of grape juice, tap water and groundwater.

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“…In the last few years, polymer-clay nanocomposites have received a great deal of attention, including studies on developing the composites as sorbents for non-ionic and anionic pollutants [23], organic pollutants [5], an anionic herbicide [24] and atrazine [25]. Chitosan-montmorillonite composites have been well characterized [26][27][28] and the adsorption of anionic pollutants by these composites has been investigated [29,30].…”

Section: Introductionmentioning

confidence: 99%

Selenium removal from drinking water by adsorption to chitosan–clay composites and oxides: Batch and columns tests

Bleiman

Mishael

2010

Journal of Hazardous Materials

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Atrazine removal from water by polycation–clay composites: Effect of dissolved organic matter and comparison to activated carbon

Cited by 96 publications

References 23 publications

Effect of Humic Acid on Pyrene Removal from Water by Polycation-Clay Mineral Composites and Activated Carbon

Effect of Humic Acid on Pyrene Removal from Water by Polycation-Clay Mineral Composites and Activated Carbon

Inside-Needle Extraction Method Based on Molecularly Imprinted Polymer for Solid-Phase Dynamic Extraction and Preconcentration of Triazine Herbicides Followed by GC–FID Determination

Selenium removal from drinking water by adsorption to chitosan–clay composites and oxides: Batch and columns tests

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