聚酯醇解废液的脱色动力学

Dynamics study on decolorization of PET alcoholysis waste liquid

为实现聚酯醇解废液的有效再利用,本文研究了物理吸附法及电化学氧化法对实际聚酯醇解废液的脱色纯化,同时提出了脱色后醇解废液再利用的方法。选用γ-Al_2O_3、Fe_3O_4、Fe_3O_4@壳聚糖以及活性炭对醇解废液进行物理吸附脱色,选用Fe_3O_4@壳聚糖为分散电极对醇解废液进行电化学氧化脱色,对比不同脱色方法及反应条件对脱色效果的影响,分析吸附动力学参数及电化学氧化动力学参数。数据表明,采用物理吸附法脱色,活性炭表现出最强脱色能力,活性炭投加量为200mg/L时,吸附平衡需12h,最大单位吸附质量为44.84mg/g,脱色率为84.56%,吸附动力学曲线符合伪二级反应动力学模型;采用电化学氧化脱色法,脱色平衡时间可缩短至5h,最大脱色率为94.62%,动力学曲线符合一级反应动力学模型。

In order to realize the effective reusing,alcoholysis waste liquid of polyethylene terephthalate(PET)was decolorized by adsorption and electrochemical methods and reused to degrade PET.Alcoholysis waste liquid,was decolorized by utilizingγ-Al2O3,Fe3O4,Fe3O4@chitosan and activated carbon as adsorbents.The alcoholysis waste liquid of PET was also decolorized by means of electrochemical method by utilizing Fe3O4@chitosan nanoparticles as the dispersed electrodes.The effects of decolorization methods,dosage and treating time on the color removal ratio were compared.The dynamic parameters of adsorption and electrochemical reaction were studied.Adsorption kinetic curve conformed to pseudo second order reaction model.The highest color removal ratio of was 84.56%and the maximum unit adsorption mass was 44.84mg/g by treating with 200mg/L activated carbon for 12h.The highest color removal ratio of electrochemical method was 94.62%after 5h treating.The kinetic curve conformed to first order reaction model.