Naguib Hamdy M, Zaki Elsayed G, Abdelsattar Doha E, Dhmees Abdelghaffar S, Azab Mostafa A, Elsaeed Shimaa M, Kandil Usama F
Department of Petroleum Applications, Egyptian Petroleum Research Institute (EPRI), Nasr City, 11727 Cairo, Egypt.
Key Laboratory for Advanced Technology in Environmental Protection of Jiangsu Province, Yancheng Institute of Technology, Yancheng 224051, Jiangsu Province, China.
ACS Omega. 2023 Feb 25;8(9):8804-8814. doi: 10.1021/acsomega.3c00086. eCollection 2023 Mar 7.
Climate change is being currently faced globally; controlling the plastic waste and gas emission is aimed to reduce their hazardous effects. In this work, polyethylene terephthalate (PET) and polyvinyl chloride (PVC) polymer wastes are used as fillers to calcium silicate. Chemical treatment was performed to get the best efficiency of the binder material with the treated PET (TPET) and treated PVC (TPVC). The used silicate, new nonhydraulic dicalcium silicate, was synthesized by sintering. A new environmentally friendly polymer concrete, based on different concentrations of PET-/TPET-/PVC-/TPVC-dicalcium silicate composites, was prepared and cured by carbonation. FTIR analysis confirms that the treatment gave functional groups on the polymer surface; also, the hydrophilicity was increased after treatment. SEM photos show that the treated polymers have a rougher surface, which led to improved attachment with cement. The structures of the prepared and cured cement materials are proved by XRD, FTIR analysis, and SEM, through the change of calcium silicate to carbonate. Carbon footprint is used to analyze the environmental implications of the prepared composites. After the treatment reaction, the TPET-cement and TPVC-cement composites showed improved compression and flexural properties and more stability against water absorption. The novelty arises from recycling this plastic waste in the proposed low-energy dicalcium silicate cement, for the first time, to give improved environmentally friendly composites after converting CO gas to carbonates, with the reduced carbon footprint.
当前全球都在面临气候变化；控制塑料垃圾和气体排放旨在减少其有害影响。在这项工作中，聚对苯二甲酸乙二酯（PET）和聚氯乙烯（PVC）聚合物废料被用作硅酸钙的填料。进行了化学处理，以使粘结剂材料与处理后的PET（TPET）和处理后的PVC（TPVC）达到最佳效率。所用的硅酸盐，即新型非水硬性硅酸二钙，是通过烧结合成的。制备了一种基于不同浓度的PET-/TPET-/PVC-/TPVC-硅酸二钙复合材料的新型环保聚合物混凝土，并通过碳酸化进行养护。傅里叶变换红外光谱（FTIR）分析证实，处理后聚合物表面产生了官能团；而且，处理后亲水性增强。扫描电子显微镜（SEM）照片显示，处理后的聚合物表面更粗糙，这导致与水泥的粘结性得到改善。通过X射线衍射（XRD）、FTIR分析和SEM，通过硅酸钙向碳酸盐的转变，证明了制备和养护后的水泥材料的结构。碳足迹用于分析所制备复合材料对环境的影响。处理反应后，TPET-水泥和TPVC-水泥复合材料的抗压和抗弯性能得到改善，吸水性稳定性更高。这项创新在于首次在所提出的低能耗硅酸二钙水泥中回收这种塑料废料，在将一氧化碳气体转化为碳酸盐后得到性能更好的环保复合材料，同时减少了碳足迹。
