Coal fly ash (CFA) is a byproduct of thermal power plant and collected from flue gases by separator. Composition of CFA depends on the type of coal used and it has both crystalline and amorphous character. It is considered to be an environmental pollutant and used in number of areas. CFA is a useful material and widely used in cement production and as a promising adsorbent for water remediation. CFA used for remediation of wastewater solves problems related to water quality issues and waste management. The physical properties such as porosity, surface area, morphology, and chemical composition (iron oxide, alumina, silica, titania, etc.) make CFA efficient material for wastewater treatment. CFA is also converted to geopolymer, which is used as an adsorbent and photocatalyst. Dye, organic compounds, toxic heavy metal ions, etc. have been removed using CFA and modified CFA adsorbents. Different adsorption efficiencies have been reported for different adsorbate and CFA adsorbents. Numbers of adsorption isotherm and kinetic models have been discussed.

粉煤灰 (CFA) 是火力发电厂的副产品，通过分离器从烟气中收集。CFA 的成分取决于所用煤的类型，具有结晶和无定形特征。它被认为是一种环境污染物，并在许多地区使用。CFA是一种有用的材料，广泛用于水泥生产和作为一种有前途的水修复吸附剂。用于废水修复的 CFA 解决了与水质问题和废物管理相关的问题。孔隙率、表面积、形态和化学成分（氧化铁、氧化铝、二氧化硅、二氧化钛等）等物理特性使 CFA 成为废水处理的有效材料。CFA 也转化为地质聚合物，用作吸附剂和光催化剂。染料、有机化合物、有毒重金属离子等 已使用 CFA 和改性 CFA 吸附剂去除。已经报道了不同吸附物和 CFA 吸附剂的不同吸附效率。已经讨论了吸附等温线和动力学模型的数量。