Bioinspired control of colloidal silica in vitro by dual polymeric assemblies of zwitterionic phosphomethylated chitosan and polycations or polyanions

Demadis, Konstantinos D.; Pachis, Konstantinos; Ketsetzi, Antonia; Stathoulopoulou, Aggeliki

doi:10.1016/j.cis.2009.07.005

Cited by 58 publications

(39 citation statements)

References 145 publications

(168 reference statements)

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“…Moreover, the drop in inhibitory activity as PALAM concentration increases can be explained on the basis of inhibitor entrapment in the forming colloidal silica particles. This has been observed before on several occasions [46,47] and it is due to the strong hydrogen bonding and ionic interactions between the positively charged PALAM and the negatively charged silica surfaces.…”

Section: Inhibitory Activity Results Of Palammentioning

confidence: 91%

Profound “turn-off” effects of anionic polymers on the inhibitory activity of cationic polyallylamine in the prevention of silica scale

Spinthaki¹,

Stathoulopoulou²,

Demadis

2015

Int. J. Corros. Scale Inhib.

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Colloidal/amorphous silica (SiO 2 nH 2 O, n is variable) is considered as the most undesirable inorganic precipitate that forms during various processes in silica-supersaturated industrial waters. In this paper we present how certain polymeric chemical additives can prevent silicic acid polymerization to form colloidal silica, which may lead to deposition onto industrial equipment. More specifically, stabilization of silicic acid is accomplished by using a cationic polymer, polyallylamine hydrochloride (PALAM), in supersaturated silica solutions (starting silica concentration in the form of silicate 500 ppm, or 8.3 mM sodium orthosilicate, Na 2 SiO 3 ·5H 2 O, expressed as SiO 2 ) at pH = 7. PALAM is a linear homopolymer that carries one amine side functional group every two carbon atoms, so it becomes protonated at circumneutral pH, rendering the molecule cationic. Its blends with anionic polymers such as carboxymethylinulin (CMI), poly(acrylamide-co-acrylic acid) (PAM-co-AA) and phosphonomethylated chitosan (PCH) are also studied for their silica scale inhibition efficiency.

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Section: Inhibitory Activity Results Of Palammentioning

confidence: 91%

Profound “turn-off” effects of anionic polymers on the inhibitory activity of cationic polyallylamine in the prevention of silica scale

Spinthaki¹,

Stathoulopoulou²,

Demadis

2015

Int. J. Corros. Scale Inhib.

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“…Ideally, coagulation should leave no aluminium, no silica, and no ferric ions in the pretreated water for RO feed (Demadis 2009, Healy 1994). …”

Section: Colloidal Silicamentioning

confidence: 99%

Silica fouling in coal seam gas water reverse osmosis desalination

Lunevich

Sartipy

Milne

et al. 2017

Environ. Sci.: Water Res. Technol.

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i AbstractSilica precipitation and silica scale formation on membrane surfaces in RO desalination present a significant operational challenge in water purification. Silica scale formation on the membrane surface leads to flux decline, RO system productivity lost, membrane degradation, and increased cost of chemicals. In spite of the apparent simplicity of silica's composition and scale formation on the membrane surface, fundamental questions and empirical knowledge persist about the formation, solubility and behaviour of silica species during the silica polymerisation, precipitation and scale formation.The broad objective of the present study was to define conditions and factors affecting silica polymerisation and precipitation in coal seam gas (CSG) waters in Australia. The scope of the problem was narrowed to focus on dissolved silica species studied by 29 Si NMR spectroscopy, removal of silica by coagulation as pre-treatment step for RO desalination and silica fouling patterns in RO desalination for a range of salinities in both synthetic and CSG waters to develop a conceptual model of silica precipitation and deposition on the membrane surface.The CSG industry in Australia generates significant quantities of CSG water, especially during the first 3-5 years of reservoir development when the hydraulic pressure needs to be released to extract the gas from coal seam. To avoid high cost of brine treatment and residual disposal frequently requires high recovery RO desalination to treat CSG water to level acceptable for further re-use. Furthermore, CSG waters in Australia have all four critical parameters, which potentially lead to silica precipitation prior it reached the solubility limit. These parameters include medium to high salinity, medium silica concentrations, high alkalinity at pH9 and slightly elevated aluminium concentrations.Practical field, theoretical and laboratory research works have been undertaken to study industry's concerns and bring fundamental and practical solutions to the problem. In Sodium ions depress silica solubility at the same time preventing silica from deposition on the membrane surface. The majority of dissolved silica polymerised in the bulk solution and was discharged in the reject stream of the RO system. To conclude practical silica solubility or the solubility defined empirically is a key for prevention of silica polymerisation in RO desalination systems.iii

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“…Such an effect was shown on mixed NH 3+ /COOH − terminated surfaces where SiO 2 is preferentially nucleated and deposited [62]. Another study demonstrated an influence of zwitterionic chitosan backbone on silicification, presumably by forming hydrogen bonds and thus stabilizing silicate in solution [63,64]. A possible mechanistic explanation was presented for proteins with a so-called charge relay effect resulting from duplet motifs which were proposed to promote the dehydration of Si(OH) 4 [57].…”

Section: Discussionmentioning

confidence: 99%

Biogenic and Synthetic Peptides with Oppositely Charged Amino Acids as Binding Sites for Mineralization

et al. 2017

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Proteins regulate diverse biological processes by the specific interaction with, e.g., nucleic acids, proteins and inorganic molecules. The generation of inorganic hybrid materials, such as shell formation in mollusks, is a protein-controlled mineralization process. Moreover, inorganic-binding peptides are attractive for the bioinspired mineralization of non-natural inorganic functional materials for technical applications. However, it is still challenging to identify mineral-binding peptide motifs from biological systems as well as for technical systems. Here, three complementary approaches were combined to analyze protein motifs consisting of alternating positively and negatively charged amino acids: (i) the screening of natural biomineralization proteins; (ii) the selection of inorganic-binding peptides derived from phage display; and (iii) the mineralization of tobacco mosaic virus (TMV)-based templates. A respective peptide motif displayed on the TMV surface had a major impact on the SiO2 mineralization. In addition, similar motifs were found in zinc oxide- and zirconia-binding peptides indicating a general binding feature. The comparative analysis presented here raises new questions regarding whether or not there is a common design principle based on acidic and basic amino acids for peptides interacting with minerals.

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Bioinspired control of colloidal silica in vitro by dual polymeric assemblies of zwitterionic phosphomethylated chitosan and polycations or polyanions

Cited by 58 publications

References 145 publications

Profound “turn-off” effects of anionic polymers on the inhibitory activity of cationic polyallylamine in the prevention of silica scale

Profound “turn-off” effects of anionic polymers on the inhibitory activity of cationic polyallylamine in the prevention of silica scale

Silica fouling in coal seam gas water reverse osmosis desalination

Biogenic and Synthetic Peptides with Oppositely Charged Amino Acids as Binding Sites for Mineralization

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