School of Chemical Science, Universiti Sains Malaysia, 11800, Minden, Penang, Malaysia.
School of Civil Engineering, Universiti Sains Malaysia, Engineering Campus, 14300, Nibong Tebal, Penang, Malaysia.
Chem Asian J. 2022 Jul 15;17(14):e202200286. doi: 10.1002/asia.202200286. Epub 2022 Jun 10.
Spent bleaching clay (SBC) is a problematic waste from the palm oil industry with worldwide availability. In this study, geopolymer was synthesized from SBC, a kind of aluminosilicate material with an alkaline activator solution that is made up of sodium hydroxide and sodium silicate. Calcium silicate (CS), which is a by-product of the silicates removal from wastewater, was also added to the formulation. The geopolymer mixture paste was cured in an oven at 80 °C for 24 h and at room temperature for 7 days. The characterizations were carried out using FTIR spectroscopy, SEM/EDX, TGA, BET, and XRD. The SEM images showed an aggregate of aluminosilicate material is formed with some unreacted particles on the surface of the geopolymer. The TGA results show that the geopolymers decomposed at a higher temperature than SBC, demonstrating its heat resistance properties. The BET results showed the addition of CS formed a denser geopolymer with a total pore volume of 0.0636 cm /g.
废漂白土（SBC）是一种来自棕榈油行业的问题废物，在全球范围内都有供应。在这项研究中，使用一种含有氢氧化钠和硅酸钠的碱性激活剂溶液，从 SBC 这种含铝硅酸盐材料中合成了地质聚合物。还向配方中添加了硅酸钙（CS），这是从废水中去除硅酸盐的副产品。将地质聚合物混合物糊在 80°C 的烤箱中固化 24 小时，并在室温下固化 7 天。使用傅里叶变换红外光谱（FTIR）、扫描电子显微镜/能谱（SEM/EDX）、热重分析（TGA）、比表面积和孔隙度分析仪（BET）和 X 射线衍射（XRD）进行了表征。SEM 图像显示形成了一种含铝硅酸盐材料的聚集体，在地质聚合物的表面上有一些未反应的颗粒。TGA 结果表明，与 SBC 相比，地质聚合物在更高的温度下分解，表明其具有耐热性能。BET 结果表明，CS 的添加形成了具有总孔体积为 0.0636cm/g 的更致密的地质聚合物。
