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。本研究采用硫酸（H₂SO₄）作为活化剂，通过化学活化法制备PET基活性炭。系统考察了浸渍比、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（central composite design，CCD）方法分析制备参数对响应值的影响，并基于该设计构建了比表面积与产率的二次回归模型。通过方差分析（analysis of variance，ANOVA）识别了各实验响应的显著影响因素。最终得到的PET基活性炭最优制备条件为：浸渍比37.63%、活化温度600℃、活化时间30 min，此时所得活性炭比表面积可达537 m²/g，产率为12.57%。