The recycling of pyrolysis carbon black (CBp) from waste tires is crucial in consideration of the conservation of secondary resources and the alleviation of potential hazardous effects on the environment. However, the high ash content, low surface activity and big particle size limit its high-value utilization, such as the reinforcing of tires. In this work, a novel approach of upgrading CBp derived from waste tires has been developed by a combination of recyclable ferrate/alkaline treatment and ultrasound. In this approach, the ferrate/alkaline is used to remove impurities of CBp and introduce oxygen groups with high activities, and the ultrasound can break the agglutinated CBp particles and accelerate the impurities reduction effectively. Upgrading conditions including temperature, reaction time, and reagent ratio were explored and optimized. Compared with non-upgraded CBp (n-CBp), the upgraded CBp (u-CBp) had a much lower content of impurities (1.74%) and a comprehensive promotion in physicochemical properties. The u-CBp exhibited superior in-rubber performance to the commercial carbon black (N550/N660). Furthermore, the ferrate can be recycled to upgrade CBp several times. This method offered a promising solution of CBp upgrading and waste tire recycling and contribute to the closed-loop recycling of waste tires and environmental sustainability.

中文翻译：

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在超声波的帮助下，通过可回收的铁酸盐/碱性处理升级热解炭黑


考虑到保护二次资源和减轻对环境的潜在危害，从废轮胎中回收热解炭黑 （CBp） 至关重要。然而，高灰分含量、低表面活性和大粒径限制了其高价值利用，例如轮胎的加固。在这项工作中，通过可回收的铁酸盐/碱性处理和超声相结合，开发了一种从废轮胎中提取的 CBp 升级的新方法。该方法采用铁酸盐/碱性去除CBp中的杂质，引入高活性氧基团，超声可打破凝集的CBp颗粒，有效加速杂质还原。探索和优化了包括温度、反应时间和试剂比例在内的升级条件。与未升级的 CBp （n-CBp） 相比，升级后的 CBp （u-CBp） 杂质含量低得多 （1.74%），物理化学性质得到全面提升。u-CBp 表现出优于商用炭黑 （N550/N660） 的橡胶内性能。此外，铁酸盐可以回收利用以多次升级 CBp。这种方法提供了一种有前途的 CBp 升级和废旧轮胎回收解决方案，有助于废旧轮胎的闭环回收和环境可持续性。