OPTIMIZATION OF PREPARATION CONDITIONS FOR ACTIVATED CARBONS FROM POLYETHYLENE TEREPHTHALATE USING RESPONSE SURFACE METHODOLOGY

Abstract This work proposes the optimal conditions for the preparation of activated carbons from polyethylene terephthalate (PET) with good surface area and yield. The PET-based activated carbon was prepared using a chemical activation technique employing sulfuric acid (H2SO4). Different preparation conditions involving impregnation ratio, activation temperature and activation time were investigated to evaluate their effects on both surface area and yield. The central composite design (CCD) approach was adopted to determine the effects of preparation conditions on responses. Based on the CCD, quadratic models for both surface area and yield were developed. The significant factors for each experimental design response were identified from the analysis of variance (ANOVA). The optimum conditions for PET-based activated carbon preparation were obtained by using an impregnation ratio of 37.63%, activation temperature of 600ºC, and activation time of 30 min, which resulted in 537 m2/g of surface area and a 12.57% yield.

摘要 本研究提出了以聚对苯二甲酸乙二酯（polyethylene terephthalate，PET）为原料制备兼具优异比表面积与良好产率的活性炭的最优工艺条件。本研究采用以硫酸（H₂SO₄）为活化剂的化学活化法制备PET基活性炭，考察了浸渍比、活化温度与活化时间等不同制备参数，以评估其对活性炭比表面积与产率的影响。本研究采用中心复合设计（CCD）方法分析制备条件对响应指标的影响，并基于CCD实验设计分别建立了比表面积与产率的二次模型。通过方差分析（ANOVA），识别出各实验设计响应值的显著影响因素。最终得到PET基活性炭制备的最优工艺条件为：浸渍比37.63%、活化温度600℃、活化时间30 min，此条件下制备的活性炭比表面积可达537 m²/g，产率为12.57%。