Plastic trash can be converted into activated carbon, which produces a product that is both useful and profitable, whilst also providing an environmentally friendly alternative. In this study, using a simple one-step chemical activation process with KOH, we successfully synthesized high-quality activated carbon from polyvinyl chloride (PVC), a common plastic. A thorough investigation was conducted into the effects of different processing parameters on the quality of the activated carbon made from PVC plastic, such as the PVC:KOH ratio, activation temperature and time. After determining the ideal parameters to optimize the iodine adsorption capacity, it was discovered that a PVC:KOH ratio of 1:2, an activation temperature of 500 °C and a 15-minute duration produced the best results. After 15 minutes of adsorption and 1 g L of adsorbent, the resultant activated carbon showed remarkable adsorption effectiveness for the organic dye methylene blue (MB), with a removal percentage of almost 97% at an MB concentration of 20 ppm. Furthermore, the impact of solution pH on the efficacy of MB adsorption was investigated and it was determined that the ideal pH range for the adsorption process was between 9 and 11. The MB adsorption isotherm was studied using the Langmuir and Freundlich models in order to have a deeper understanding of the adsorption behavior. Based on the calculated maximum MB adsorption capacity of around 97.1 mg g, the results showed that the adsorption process adhered to the Langmuir adsorption isotherm model throughout. The adsorption kinetics and reusability of the activated carbon were also investigated. These results highlight the potential of activated carbon based on PVC as a successful adsorbent for the removal of organic dyes from aqueous solutions.

中文翻译：

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从聚氯乙烯塑料废物中一步制备活性炭作为去除水溶液中有机染料的有效吸附剂

塑料垃圾可以转化为活性炭，从而生产出既有用又有利可图的产品，同时也提供了一种环保的替代品。在这项研究中，我们使用 KOH 的简单一步化学活化工艺，成功地从一种常见塑料聚氯乙烯 (PVC) 中合成了高质量的活性炭。对不同加工参数（例如 PVC:KOH 比例、活化温度和时间）对 PVC 塑料制成的活性炭质量的影响进行了深入研究。在确定优化碘吸附能力的理想参数后，发现 PVC:KOH 比例为 1:2、活化温度为 500 °C、持续时间为 15 分钟可产生最佳结果。经过1 g L吸附剂的吸附15分钟后，所得活性炭对有机染料亚甲基蓝（MB）表现出显着的吸附效果，在MB浓度为20 ppm时，去除率接近97%。此外，还研究了溶液pH值对MB吸附效果的影响，确定吸附过程的理想pH范围为9至11。使用Langmuir和Freundlich模型研究了MB吸附等温线，以便得到对吸附行为有更深入的了解。根据计算得出的MB最大吸附容量约为97.1 mg·g，结果表明吸附过程始终遵循Langmuir吸附等温线模型。还研究了活性炭的吸附动力学和可重复使用性。这些结果凸显了基于 PVC 的活性炭作为成功吸附剂从水溶液中去除有机染料的潜力。