Studies of the oxidative photoinduced degradation of silicones in the aquatic environment

Anderson, C.; Hochgeschwender, Klaus; Weidemann, Herbert; Wilmes, Rolf

doi:10.1016/0045-6535(87)90315-8

Cited by 33 publications

(11 citation statements)

References 7 publications

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“…After DMSD volatilizes into the atmosphere, it should undergo oxidation of its methyl groups by reaction with sunlight-induced hydroxyl radicals in the air, in similar fashion to other volatile siloxanes [9,10]. If the compound is instead washed out of the air in rainfall, it may be oxidized in water by photolytic demethylation [11,12], or it can be microbially oxidized in soil [1].…”

Section: Comparison With Previous Workmentioning

confidence: 99%

Volatilization and Sorption of Dimethylsilanediol in Soil

Lehmann

Miller

1996

Environ Toxicol Chem

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Our previous studies showed that dimethylsilanediol (DMSD) was the main hydrolysis product of silicone (polydimethylsiloxane) polymer in soil. In the present study, volatilization of 14 C-DMSD from soil (1 mg kg Ϫ1 ) was investigated in open tubes, with weekly remoistening. Losses of 14 C from Londo sandy clay loam and Pipestone sand were about 3.6 and 7.7% wk Ϫ1 , respectively, and were attributed mostly to volatilization. For select samples, DMSD was trapped and identified as the volatilized compound. From 12 soils of variable properties, losses ranged from 1.4 to 6.4% wk Ϫ1 , with higher rates correlated with sandier textures. An estimated K d of 0.1 L kg Ϫ1 in wet soil suggests potential mobility of DMSD, but increased bonding with soil drying means that mobility will be retarded under field conditions. Results suggest that volatilization will be a major route of loss of DMSD from soil.

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Section: Comparison With Previous Workmentioning

confidence: 99%

Volatilization and Sorption of Dimethylsilanediol in Soil

Lehmann

Miller

1996

Environ Toxicol Chem

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“…As a consequence, waterborne silicones will end up and accumulate in the environment, adsorb and deposit in sediments [8]. Silicone polymer fluids are therefore considered as environmentally persistent substances [5,9]. Their increased use and the need for effective treatment processes for silicone-containing wastewater has therefore become a matter of environmental importance.…”

Section: Introductionmentioning

confidence: 99%

Photo‐Fenton Remediation of Wastewaters Containing Silicones: Experimental Study and Neural Network Modeling

Teixeira

Guardani

Nascimento³

2004

Chem Eng & Technol

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The present work is aimed at the investigation of the photo-Fenton technology with regard to the remediation of diluted aqueous emulsions containing an aminosilicone polymer, in a bench-scale photochemical reactor. The experimental results show a strong interaction between temperature, light, Fe(II) and H 2 O 2 concentrations on the degradation process, which generates substances that might be readily biodegradable and/or a solid phase that is easily separated by simple mechanical operations. The neural network technique is an effective, simple approach to successfully modeling the photo-Fenton degradation system, in which thermal and photochemical reactions and related phenomena (such as solid precipitation) take place. The model might therefore be useful in process optimization, as well as in the design and scaleup of photochemical reactors for industrial application.

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“…In this study, water-resistant coatings for paper are reported. These coatings rely on polysiloxanes, which are affordable and biocompatible materials that biodegrade into nontoxic silicate minerals − and thus are safe for food processing. − To promote firm binding of the poly(dimethylsiloxane) (PDMS) onto paper substrates, melamine was used as a primer. Melamine is a FDA-approved material for food-contact applications (tolerable level is 0.63 mg/kg of body weight, per day) that exhibits superior binding to paper because it is a strong hydrogen donor as well as an acceptor, thus providing it with excellent performance as a primer.…”

Section: Introductionmentioning

confidence: 99%

Fabrication of Food-Safe Water-Resistant Paper Coatings Using a Melamine Primer and Polysiloxane Outer Layer

Rabnawaz

2018

ACS Omega

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Paper-based materials are highly desirable as packaging materials due to their numerous advantages that include low cost, renewability, and biodegradability. However, their hydrophilicity has limited their range of applications. Reported herein is a facile and economical approach for the preparation of biodegradable water-resistant paper for food-contact applications. Commercial printing paper and cup papers are coated with melamine, which is FDA approved for food-contact applications. Subsequently, a water-repellent outer layer is applied using poly(dimethylsiloxane) (PDMS)–isocyanate. A relationship between the PDMS concentration and water contact angles (WCAs) of the obtained coating was studied. Typically, the coated cup paper and printing paper had coating loadings of 1.61 ± 1.10 and 0.93 ± 0.74 wt %, respectively. After the coatings had been applied, the WCAs were very high (>125°), and water absorption had decreased by 70% for printing paper and by 35% for cup paper. Considering the facile fabrication method and the low-cost food-safe raw materials, herein, this approach will have great potential for the large-scale production of materials for use in food- and nonfood contact applications.

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Studies of the oxidative photoinduced degradation of silicones in the aquatic environment

Cited by 33 publications

References 7 publications

Volatilization and Sorption of Dimethylsilanediol in Soil

Volatilization and Sorption of Dimethylsilanediol in Soil

Photo‐Fenton Remediation of Wastewaters Containing Silicones: Experimental Study and Neural Network Modeling

Fabrication of Food-Safe Water-Resistant Paper Coatings Using a Melamine Primer and Polysiloxane Outer Layer

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