Department of Chemical Engineering, 32610, Bandar Seri Iskandar, Perak, Malaysia.
Department of Chemical Engineering, 32610, Bandar Seri Iskandar, Perak, Malaysia; Centre for Biofuel and Biochemical Research (CBBR), Institute for Sustainable Living, Universiti Teknologi PETRONAS, 32610, Bandar Seri Iskandar, Perak, Malaysia.
J Environ Manage. 2018 Oct 15;224:327-339. doi: 10.1016/j.jenvman.2018.07.046. Epub 2018 Jul 23.
The world water resources are contaminated due to discharge of a large number of pollutants from industrial and domestic sources. A variety of a single and multiple units of physical, chemical, and biological processes are employed for pollutants removal from wastewater. Adsorption is the most widely utilized process due to high efficiency, simple procedure and cost effectiveness. This paper reviews the research work carried out on the use of geopolymer materials for the adsorption of heavy metals and dyes. Geopolymers possess good surface properties, heterogeneous microstructure and amorphous structure. The performance of geopolymers in the removal of heavy metals and dyes is reported comparable to other materials. The pseudo-second order kinetics and Langmuir isotherm models mostly fit to the adsorption data suggesting homogeneous distribution of adsorption sites with the formation of monolayer adsorbate on the surface of geopolymers. Adsorption of heavy metals and dyes onto geopolymers is spontaneous, endothermic and entropy driven process. Future research should focus on the enhancement of geopolymer performance, testing on pollutants other than heavy metals and dyes, and verification on real wastewater in continuous operation.
由于工业和生活源排放了大量的污染物，世界水资源受到了污染。为了从废水中去除污染物，采用了多种单一和多种物理、化学和生物过程的组合。由于效率高、操作简单、成本效益好，吸附是应用最广泛的工艺。本文综述了用于吸附重金属和染料的地质聚合物材料的研究工作。地质聚合物具有良好的表面性质、不均匀的微观结构和非晶态结构。地质聚合物在去除重金属和染料方面的性能可与其他材料相媲美。准二级动力学和 Langmuir 等温线模型最适合吸附数据，表明吸附位点的均匀分布，在地质聚合物表面形成单层吸附物。重金属和染料在地质聚合物上的吸附是自发的、吸热的和熵驱动的过程。未来的研究应集中在提高地质聚合物的性能，测试除重金属和染料以外的污染物，以及在连续运行中对实际废水进行验证。
