Degradation of polycyclic aromatic hydrocarbons in crumb tyre rubber catalysed by rutile TiO₂under UV irradiation

Abstract

The polycyclic aromatic hydrocarbons (PAHs) in crumb tyre rubber were firstly degraded under UV irradiation in the presence of rutile TiO2 and hydrogen peroxide. The effects of light intensity, catalyst amount, oxidant amount, initial pH value, co-solvent content, and reaction time on degradation efficiency of typical PAHs in crumb tyre rubber were studied. The results indicated that UV irradiation, rutile TiO2, and hydrogen peroxide were beneficial to the degradation of PAHs and co-solvent could accelerate the desorption of PAHs from crumb tyre rubber. Up to 90% degradation efficiency of total 16 PAHs could be obtained in the presence of rutile TiO2 (1 wt%) and hydrogen peroxide (1.0 mL) under 1800 µW cm(-2) UV irradiation for 48 h. The high molecular weight PAHs (such as benz(a)pyrene) were more difficult to be degraded than low molecular weight PAHs (such as phenanthrene, chrysene). Moreover, through the characterization of reaction solution and degradation products via GC-MS, it was proved that the PAHs in crumb tyre rubber were successfully degraded.

Effects of tire leachate on the invasive mosquito Aedes albopictus and the native congener Aedes triseriatus

“…Tires leach compounds as their rubber deteriorates, and the rate of deterioration is the result of the time and intensity of exposure to the combined effects of temperature, UV radiation, and humidity. These environmental variables cause discoloration, cracking, and splitting of tire sidewall tire rubber and oxidation of the steal belt ( Andrady et al, 1998 ; Andrady, Hamid & Torikai, 2003 ; Yu et al, 2015 ). It is possible that the discarded tires at the illegal dumping sites were exposed to the environment longer than tires at auto-repair shops, which would likely be eventually sold or recycled.…”

Synthesis of N/Fe Comodified TiO2Loaded on Bentonite for Enhanced Photocatalytic Activity under UV-Vis Light

“…Environmental applications of titanium dioxide (TiO 2 ) have received a lot of recent interests from researchers. Due to its fine electronic properties, high photocatalytic activity, chemical stability, and low costs, TiO 2 is commonly used as a photocatalyst for the degradation of various pollutants [1,2]. For the photocatalytic degradation, first, TiO 2 absorbs the solar light to boost its electrons from the valence band to the conduction band, thus forming electron-hole pairs (e − -h + ).…”

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“…Tires leach compounds as their rubber deteriorates, and the rate of deterioration is the result of the time and intensity of exposure to combined effects of temperature, UV radiation, and humidity. These environmental variables cause discoloration, cracking, and splitting of tire sidewall tire rubber and oxidation of the steal belt (Andrady et al, 1998, Andrady et al, 2003, Yu et al, 2015. It is possible that the discarded tires at the illegal dumping sites were exposed to the environment longer than tires at auto-repair shops, which would likely be eventually sold or recycled.…”