Phosphate binding polymeric hydrogels for aquaculture wastewater remediation

Kioussis, D.; Wheaton, F. W.; Kofinas, Peter

doi:10.1016/s0144-8609(98)00049-1

Cited by 46 publications

(22 citation statements)

References 8 publications

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“…58 The driving forces for the binding are most likely a combination of electrostatic attraction and the release of water from both the amino group and the phosphate, providing an entropic contribution to the process. This relatively strong interaction of phosphate ions with the amino groups of PAH [59][60][61][62] can be easily demonstrated. When PAH is exposed to phosphate ions the aqueous solution becomes turbid, indicating phosphate-induced cross-linking of PAH.…”

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confidence: 88%

Lipid layers on polyelectrolyte multilayer supports

et al. 2008

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The mechanism of formation of supported lipid layers from phosphatidylcholine and phosphatidylserine vesicles in solution on polyelectrolyte multilayers was studied by a variety of experimental techniques. The interaction of zwitterionic and acidic lipid vesicles, as well as their mixtures, with polyelectrolyte supports was followed in real time by micro-gravimetry. The fabricated lipid-polyelectrolyte composite structures on top of multilayer coated colloidal particles were characterized by flow cytometry and imaging techniques. Lipid diffusion over the macroscopic scale was quantified by fluorescence recovery after photobleaching, and the diffusion was related to layer connectivity. The phospholipid-polyelectrolyte binding mechanism was investigated by infrared spectroscopy. A strong interaction of polyelectrolyte primary amino groups with phosphate and carboxyl groups of the phospholipids, leading to dehydration, was observed. Long-range electrostatic attraction was proven to be essential for vesicle spreading and rupture. Fusion of lipid patches into a homogeneous bilayer required lateral mobility of the lipids on the polyelectrolyte support. The binding of amino groups to the phosphate group of the zwitterionic lipids was too weak to induce vesicle spreading, but sufficient for strong adsorption. Only the mixture of phosphatidylcholine and phosphatidylserine resulted in the spontaneous formation of bilayers on polyelectrolyte multilayers. The adsorption of phospholipids onto multilayers displaying quarternary ammonium polymers produced a novel 3D lipid polyelectrolyte structure on colloidal particles.

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confidence: 88%

Lipid layers on polyelectrolyte multilayer supports

et al. 2008

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“…The easiest method of reducing P i concentrations in an aquaculture system (recirculating or £ow through) may therefore be simply to dilute the system water by increasing the percentage of seawater that is exchanged each day. Other limitations include that the transport process must be reasonably insensitive to pH changes and that it is limited by the presence of particulates or organics which are common fouling constituents of aquaculture systems (Kioussis et al 1999). This involves using macro algae to remove high concentrations of nutrients from seawater.…”

Section: Discussionmentioning

confidence: 99%

The effects of elevated concentrations of dissolved inorganic phosphate in seawater on the growth and survival of juvenile abalone, Haliotis iris

James

Barr

2011

Aquaculture Research

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Seawater sampling from three abalone farms in New Zealand showed average ambient concentrations of dissolved inorganic phosphate (P i ) varying between 2.36 and 238 mM. The P i concentration within each system appeared to be directly linked to the percentage of water that was replaced each day. An experiment was conducted over 5 months to examine the e¡ect of elevated P i concentrations on the growth of two juvenile abalone (Haliotis iris) size classes (small: average shell length 5 23.9 AE 0.1 and large: average shell length 5 61.9 AE 0.1mm). Abalone from each size class were exposed to P i concentrations of; (a) natural incoming seawater (average 0.12 AE 0.12 mM), (b) 10.7 AE 1.3 mM, (c) 60.9 AE 5.8 mM and (d) 113.1 AE 5.6 mM. The results suggest that over the course of the 5-month period of this experiment there was a signi¢cant negative impact on growth (shell length and wet weight) when the smaller size class of abalone were exposed to P i concentrations greater than 10.7 mM and for the large size class of abalone when exposed to greater than 60.9 mM P i . However, elevated P i concentrations did not signi¢cantly impact on abalone survival during the course of the experiment.

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“…Maaskant et al (1986) succeeded in removing lipoprotein from blood plasma using particulate sulfate poly(vinyl alcohol) gel. Kioussis et al (1999) found that poly(allylamine) is effective to remove nutrient pollutants from aquacultural wastewater due to the ability of their gel to adsorb phosphates selectively. The authors consider gel as a promising material in separation engineering.…”

Section: Introductionmentioning

confidence: 99%