Removal of sulfonated humic acid from aqueous phase by modified coal fly ash waste: Equilibrium and kinetic adsorption studies

Sulfonated humic acid (SHA) is a representative organic pollutant in oilfield wastewater. This study investigated the performance of modified fly ash in removal of SHA from aqueous solution. Two types of raw fly ash, including Shand fly ash (class C) and BD fly ash (class F) were used. X-ray diffraction and surface area analyses were also implemented to characterize the change of fly ash after modification. The results showed suitable acid- and …