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The influence of Tween 20 concentration on biodesulfurization of ground tire rubber by Sphingomonas sp.(PDF)

Chinese Journal of Applied & Environmental Biology[ISSN:1006-687X/CN:51-1482/Q]

2015 06
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The influence of Tween 20 concentration on biodesulfurization of ground tire rubber by Sphingomonas sp.
CUI Xiaoxiao ZHAO Suhe HU Minghan LI Chao WANG Bingwu
1Key Laboratory of Beijing City on Preparation and Processing of Novel Polymer Materials, Beijing University of Chemical Technology, Beijing 100029, China 2College of Life Science and Technology, Beijing University of Chemical Technology, Beijing 100029, China
Sphingomonas sp. ground tire rubber desulfurization surfactant crosslinking density
Q939.97 : X705

Sphingomonas sp. has metabolic function on combined sulfur of waste ground tire rubber (GTR). However, its poor compatibility with lipophilic rubber limits its desulfurization effect. Adding surfactant Tween 20 in the desulfurization process can significantly improve the desulfurization effect through increasing the affinity between rubber and bacteria. This research used different dosage of Tween 20 as a variable in desulfurization process to study the effect of Tween 20 concentration on the growth of Sphingomonas sp. and Sphingomonas sp. on chemical structure of GTR surface within a certain depth range. We also investigated the properties and morphology of styrene butadiene rubber (SBR) composite filled with desulfurized ground tire rubber (DGTR). The results showed that the Tween 20 dosages studied had no inhibitory effect on the metabolism of Sphingomonas sp, with a small amount of Tween 20 even promoting the growth of bacteria. Among all the concentrations, Tween 20 of 0.5 g/L showed the best effect in enhancing bio-desulfurization. The swelling value of?DGTR-0.5 (the desulfurized?ground tire rubber with 0.5 g/L Tween 20) was 6.6% higher than that of GTR and 3% higher than that of (the desulfurized?ground tire rubber without Tween 20); the crosslinking density of DGTR-0.5 was 9.4% and 4% respectively lower than that of GTR and DGTR-0. DGTR-0.5 showed less S-S bonds and S-C bonds but more S-O bonds with the content of S on the surface 63.6% and 37% respectively lower than that of GTR and DGTR-0. The content of O on surface in DGTR-0.5 was 62.1% and 16% respectively higher than that of GTR and DGTR-0. Compared with the mechanical properties of GTR/SBR composite, those of DGTR/SBR composite were improved with enhanced interaction between DGTR surface and?base?rubber, in particular the most significant improvement in DGTR-0.5/SBR. The results indicated that 0.5 g/L Tween 20 is the best dosage on bio-desulfurization of ground tire rubber by Sphingomonas sp.


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