Antifouling strategies and corrosion control in cooling circuits

Cristiani, Pierangela; Perboni, Giorgio

doi:10.1016/j.bioelechem.2014.01.002

Cited by 37 publications

(25 citation statements)

References 14 publications

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“…1,2 Although the FO process is less prone to fouling than reverse osmosis (RO), membrane fouling (notably biofouling) remains one of the important limitations to its widespread application. 4 Although using oxidizing agents is a common method for controlling biofouling, 5,6 other alternative methods must be considered because PA layers are sensitive to chemical oxidation and degrade in the presence of common disinfectants. 4 Although using oxidizing agents is a common method for controlling biofouling, 5,6 other alternative methods must be considered because PA layers are sensitive to chemical oxidation and degrade in the presence of common disinfectants.…”

Section: Introductionmentioning

confidence: 99%

Surface modification of thin film composite forward osmosis membrane by silver-decorated graphene-oxide nanosheets

Soroush

Silvino

et al. 2015

Environ. Sci.: Nano

116

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Forward osmosis (FO), as an emerging technology for seawater desalination and wastewater reuse, has been attracting significant interest because of its energy efficiency. However, membrane fouling represents one of the major limitations for this technology, notably for thin film composite (TFC) polyamide (PA) membranes, which are prone to chlorine attack. In this study, silver nanoparticle (AgNPs)-decorated graphene oxide (GO) nanosheets (as an effective biocidal material) were covalently bonded to the PA surface to impart improved hydrophilicity and antibacterial properties to the membrane. AgNPs were synthesized in situ by the wet chemical reduction of silver nitrate onto the surface of GO nanosheets. The formation of the composite was verified by UV-vis spectroscopy, X-ray diffraction, and transmission electron microscopy techniques. The synthesized GO/Ag nanocomposites were then covalently bonded onto the TFC PA membrane surface using cysteamine through an amide forming condensation reaction.ATR-FTIR and XPS results confirmed the covalent bonding of the nanocomposite onto the TFC PA surface. Overall, the GO/Ag nanocomposite functionalized membranes exhibited super-hydrophilic properties (contact angles below 25°) and significant bacterial (E. coli) inactivation (over 95% in static bacterial inactivation tests) without adversely affecting the membrane transport properties. † Electronic supplementary information (ESI) available: FE-SEM and backscatter electron microscopy of (A) GO functionalized TFC and (B) GO/Ag nanocomposite functionalized TFC. Elements with high atomic numbers backscatter electrons more strongly than lighter elements with low atomic numbers and thus appear brighter on the image (Fig. S1). TEM images of (A) GO, (B) Ag NPs, and (C) GO/ Ag nanocomposite (Fig. S2). ATR-FTIR spectra of (A) a GO nanosheet and GO/Ag nanocomposite and (B) a control TFC and GO/Ag nanocomposite functionalized TFC membrane (Fig. S3). The zeta potential of the surface of the pristine and functionalized membranes as a function of solution pH. Measurements were taken at room temperature (23°C) in a solution of 1 mM KCl by adjusting pH with the dropwise addition of HCl and NaOH (Fig. S4). Surface roughness properties of pristine and GO/Ag functionalized TFC FO membranes (Table S1). XPS results for (A) pristine membrane and (B) cysteamine treated TFC FO membranes. Peaks at 198 eV for Cl2P and 162 for sulfur S2P are shown in (A) and (B), respectively (Fig. S5). Elemental composition of the membrane surface of pristine and functionalized membranes before and after sonication (Table S2). The physical stability of the silver NPs on the Ag NP decorated and GO/Ag functionalized membranes from XPS results. A 7 min bath sonication was applied to the membranes, and the percent of silver on the membrane surface was estimated (Fig. S6). SeeTo address the biofouling problem associated with thin film composite (TFC) forward osmosis (FO) membranes, we have developed novel surface coatings through covalent bonding of silver decorated grap...

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Section: Introductionmentioning

confidence: 99%

Surface modification of thin film composite forward osmosis membrane by silver-decorated graphene-oxide nanosheets

Soroush

Silvino

et al. 2015

Environ. Sci.: Nano

116

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“…Micro-organisms are typically combated by the use of biocides; in the seawater environment, the common approach is chlorination [4] by, e.g., the addition of hypochlorite compounds [5,6]. However, the proper dosing and timing is a balance between the efficiency of the treatment and the avoidance of the corrosive effect and environmental stress caused by the toxic effect of chlorination treatment.…”

Section: Introductionmentioning

confidence: 99%

Influence of Chlorination and Choice of Materials on Fouling in Cooling Water System under Brackish Seawater Conditions

et al. 2016

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Cooling systems remove heat from components and industrial equipment. Water cooling, employing natural waters, is typically used for cooling large industrial facilities, such as power plants, factories or refineries. Due to moderate temperatures, cooling water cycles are susceptible to biofouling, inorganic fouling and scaling, which may reduce heat transfer and enhance corrosion. Hypochlorite treatment or antifouling coatings are used to prevent biological fouling in these systems. In this research, we examine biofouling and materials’ degradation in a brackish seawater environment using a range of test materials, both uncoated and coated. The fouling and corrosion resistance of titanium alloy (Ti-6Al-4V), super austenitic stainless steel (254SMO) and epoxy-coated carbon steel (Intershield Inerta160) were studied in the absence and presence of hypochlorite. Our results demonstrate that biological fouling is intensive in cooling systems using brackish seawater in sub-arctic areas. The microfouling comprised a vast diversity of bacteria, archaea, fungi, algae and protozoa. Chlorination was effective against biological fouling: up to a 10–1000-fold decrease in bacterial and archaeal numbers was detected. Chlorination also changed the diversity of the biofilm-forming community. Nevertheless, our results also suggest that chlorination enhances cracking of the epoxy coating.

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“…It has been well established that biofouling occurred in early stage involves predominately formation of a biofilm on substratum materials [1]. For controlling biofouling in the marine environment, it is essential to understand the development of biofilm and its influence on anti-corrosion performances of marine structures.…”

Section: Introductionmentioning

confidence: 99%

Distinctive colonization of Bacillus sp. bacteria and the influence of the bacterial biofilm on electrochemical behaviors of aluminum coatings

Abdoli

Suo

2016

Colloids and Surfaces B: Biointerfaces

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Antifouling strategies and corrosion control in cooling circuits

Cited by 37 publications

References 14 publications

Surface modification of thin film composite forward osmosis membrane by silver-decorated graphene-oxide nanosheets

Surface modification of thin film composite forward osmosis membrane by silver-decorated graphene-oxide nanosheets

Influence of Chlorination and Choice of Materials on Fouling in Cooling Water System under Brackish Seawater Conditions

Distinctive colonization of Bacillus sp. bacteria and the influence of the bacterial biofilm on electrochemical behaviors of aluminum coatings

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