Study on the modification of fly ash from domestic waste incineration and its adsorption performance on Pb2+

In order to achieve a high-value use of fly ash, modified fly ash adsorbent was prepared using domestic waste incineration fly ash as raw material and Ca(OH)(2) as modifier under the action of ultrasonic waves. The adsorption performance of modified fly ash on Pb2+ in solution was investigated and characterized using XRD, SEM and FTIR for virgin fly ash, modified fly ash and adsorbed fly ash. The results show that the amount of adsorbent added, reaction time, pH and the initial concentration of Pb2+ all affect the adsorption effect of modified fly ash on Pb2+.(.)The Langmuir model and the secondary kinetic model can better simulate the adsorption behavior of modified fly ash on Pb2+ with a Gibbs free energy & UDelta;G of - 10.39 kJ mol(-1), indicating that the adsorption process is a preferential adsorption process belonging to a single molecular layer and proceeding spontaneously, and the maximum adsorption capacity can be reached 386 mg g(-1). The adsorption process of modified fly ash on Pb2+ is a chemisorption process dominated by the presence of surface complexation of -OH groups.

Automated summary

In this study, modified fly ash adsorbent was prepared using domestic waste incineration fly ash as raw material and Ca(OH)(2) as modifier under the action of ultrasonic waves. The adsorption performance of modified fly ash on Pb2+ in solution was investigated and characterized using XRD, SEM and FTIR. The results showed that the amount of adsorbent added, reaction time, pH and the initial concentration of Pb2+ all affected the adsorption effect of modified fly ash on Pb2+.