Biodegradation of Vulcanized SBR: A Comparison between Bacillus subtilis, Pseudomonas aeruginosa and Streptomyces sp

Aboelkheir, Mostafa Galal; Bedor, Priscilla Braga Antunes; Leite, Selma Gomes Ferreira; Pal, Kaushik; Filho, Romildo Dias Tolêdo; Souza, Fernando Gomes de

doi:10.1038/s41598-019-55530-y

Cited by 45 publications

(30 citation statements)

References 55 publications

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“…The SEM analysis has been used to demonstrate the changes in the rubber surface against mechanical, chemical or biological treatments (Li et al, 2012;Aboelkheir et al, 2019). In this study, SEM analysis reveal morphological changes of the analyzed rubber surface after biological and chemical treatments in comparison with the control.…”

Section: Analysis Of Rubber Particles After Biological and Microwave Treatmentsmentioning

confidence: 99%

Desulfurization of Vulcanized Rubber Particles Using Biological and Couple Microwave-Chemical Methods

Valdés

Hernández

Morales-Vera

et al. 2021

Front. Environ. Sci.

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Currently, recycling or degradation treatments for tires are an enormous challenge. Despite efforts to dispose of or recycle it, rubber waste is increasing year by year worldwide. To create a rubber-recycling system, several researchers have proposed tire desulfurization. In this study, we compare two methods: one biological, using Acidobacillus ferroxidans in shake 250 ml flask experiments, and one chemical using, for the first time, microwaves and an aqueous solution. The results of these methods were analyzed through sulfate quantification, cross-linking differences, Fourier transform infrared spectroscopy (FTIR) and scanning electron microscopy with energy disperse spectroscopy (SEM-EDS). We observed that the amount of sulfates generated by the chemical system was 22.40 (mg/L)/g of rubber, which was 22-times higher than the biological system, which generated 1.06 (mg/L)/g of rubber. Similarly, after cross-linking studies, a 36% higher decrease after the chemical treatment was observed. When using FTIR analysis, the disappearance of characteristic bands corresponding to functional groups containing sulfur bonds and metal oxides were observed by treating the sample with both desulfurization methods. Morphological changes on the rubber surface structure was also demonstrated by SEM-EDS analysis with the appearance of holes, cracks and changes in the porosity of the material. This work analyzed two different non-aggressive desulfurization approaches that might be used as methods for rubber recycling processes.

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Section: Analysis Of Rubber Particles After Biological and Microwave Treatmentsmentioning

confidence: 99%

Desulfurization of Vulcanized Rubber Particles Using Biological and Couple Microwave-Chemical Methods

Valdés

Hernández

Morales-Vera

et al. 2021

Front. Environ. Sci.

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show abstract

“…The SEM analysis has been used to demonstrate the changes in the rubber surface against mechanical, chemical or biological treatments [54,55]. In this study, SEM analysis reveal morphological changes of the analyzed rubber surface after biological and chemical treatments in comparison with the control.…”

Section: Analysis Of Rubber Particles After Biological and Microwave mentioning

confidence: 99%

Desulfurization of Vulcanized Rubber Particles Using Biological and Chemical Methods

Valdés¹,

Hernández²,

Morales-Vera³

et al. 2020

Preprint

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Currently, recycling or degradation treatments for tires are an enormous challenge. Despite efforts to dispose of or recycle it, rubber waste is increasing year by year worldwide. To create a rubber-recycling system, several researchers have proposed tire desulfurization. In this study, we compare two methods: one biological, using Acidobacillus ferroxidans in shake 250 mL flask experiments, and one chemical using, for the first time, microwaves and an aqueous solution. The results of these methods were analyzed through sulfate quantification, cross-linking differences, Fourier transform infrared spectroscopy (FTIR) and scanning electron microscopy with energy disperse spectroscopy (SEM-EDS). We observed that the amount of sulfates generated by the chemical system was 56 mg / L, which was 10-times higher than the biological system, which generated 5.3 mg / L. Similarly, after cross-linking studies, a 36% higher decrease after the chemical treatment was observed. When using FTIR analysis, the disappearance of characteristic bands corresponding to functional groups containing sulfur bonds was observed by treating the sample with both desulfurization mechanisms. Morphological changes on the rubber surface structure was also demonstrated by SEM-EDS analysis with the appearance of holes, cracks and changes in the porosity of the material. This work analyzed two different non-aggressive desulfurization mechanisms that might be used as sustainable methods for rubber recycling processes.

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“…Nowadays, the search for high‐performance, environmentally friendly, and low‐cost materials is constantly advancing. [ 7–114 ] According to Google Scholar, during the last decade (2010–2020), 1310000 articles were published in the area of high‐performance materials. They include high‐performance materials produced with polymers, with 12,5000 articles registered.…”

Section: Introductionmentioning

confidence: 99%

Geopolymer Microparticles as Up‐and‐Coming H₂S Sorbers

Maranhão¹,

Almeida²,

Souza

et al. 2021

Macromolecular Symposia

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Geopolymers are materials composed of aluminosilicates, which upon activation by the alkaline solution, form repeating units, being classified as inorganic polymers. Geopolymers have gained prominence due to obtaining the raw material that can be natural or residual, the ease of production, and cost-effective. These materials are widely used in civil construction for the replacement of Portland cement and also in the environmental area for the remediation of toxic compounds. However, there is a lack in the literature about the applications of these materials. Thus, this work deals with geopolymers for the sorption of hydrogen sulfide gas.

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Biodegradation of Vulcanized SBR: A Comparison between Bacillus subtilis, Pseudomonas aeruginosa and Streptomyces sp

Cited by 45 publications

References 55 publications

Desulfurization of Vulcanized Rubber Particles Using Biological and Couple Microwave-Chemical Methods

Desulfurization of Vulcanized Rubber Particles Using Biological and Couple Microwave-Chemical Methods

Desulfurization of Vulcanized Rubber Particles Using Biological and Chemical Methods

Geopolymer Microparticles as Up‐and‐Coming H₂S Sorbers

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Biodegradation of Vulcanized SBR: A Comparison between Bacillus subtilis, Pseudomonas aeruginosa and Streptomyces sp

Cited by 45 publications

References 55 publications

Desulfurization of Vulcanized Rubber Particles Using Biological and Couple Microwave-Chemical Methods

Desulfurization of Vulcanized Rubber Particles Using Biological and Couple Microwave-Chemical Methods

Desulfurization of Vulcanized Rubber Particles Using Biological and Chemical Methods

Geopolymer Microparticles as Up‐and‐Coming H2S Sorbers

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Product

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Geopolymer Microparticles as Up‐and‐Coming H₂S Sorbers