热解是目前处理废轮胎最为高效的方式之一,其中固相产物热解炭黑(CB)的资源化再利用是废轮胎热解技术推广的重要方向之一。本研究以热解CB为载体,制备了一种CB负载硫化亚铁复合材料(CB/FeS-0.5),结合去除Cr(Ⅵ)性能进行分析,探究其反应机制。结果表明,CB/FeS-0.5既保留了CB的多孔结构,又分散了FeS。在反应时间360min,pH=2,反应温度25℃情况下,CB/FeS-0.5的吸附量达到92.93mg/g,比未负载FeS提高了5倍左右;吸附过程符合准二级动力学、颗粒内扩散模型和Langmuir等温吸附模型,且该吸附过程是自发吸热的。CB/FeS-0.5去除机制包括物理、化学吸附及还原作用。研究结果可为废轮胎热解CB的改性和资源化再利用及其对水体中Cr(Ⅵ)的去除提供一定的理论依据。
Pyrolysis is currently the most efficient way to treat waste tires,and the resourceful utilization of solid phase product pyrolysis carbon black (CB) is one of the important directions for the promotion of waste tire pyrolysis technology.In this study,a CB loaded with FeS composite material (CB/FeS-0.5) was prepared using pyrolytic CB as a carrier.The Cr(Ⅵ) removal performance was analyzed,and its reaction mechanism was explored.The results showed that CB/FeS-0.5 not only retained the porous structure of CB but also dispersed FeS.When the reaction time was 360min,pH=2,and the reaction temperature was 25℃,the adsorption capacity of CB/FeS-0.5 reached 92.93mg/g,which was about 5 times higher than that of unloaded FeS.The adsorption process conformed to the pseudo-second-order kinetic model,intra-particle diffusion model and Langmuir isothermal adsorption model,and the adsorption process was spontaneously endothermic.The removal mechanism of CB/FeS-0.5 included physical,chemical adsorption and reduction.The research results provide a certain theoretical basis for the modification and resourceful reuse of waste tire pyrolytic CB and its removal of Cr(Ⅵ) in water.
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基金资助
国家自然科学基金(51108401);江苏省自然科学基金项目(BK20151313);江苏省研究生实践创新计划资助项目(SJCX22-1733)
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