Of Pdmdaac Modified Fly Ash And Its Performance And Applied Research

In the paper, PDMDAAC-fly ash was prepared by using poly dimethydiallylammonium chloride (PDMDAAC) and fly ash. The adsorption of PDMDAAC on fly ash and the adsorption behavior were studied. The zeta potentials of raw and modified fly ash were determined. The specific surface area of raw fly ash and modified fly ash were studied using Brurauer Emmerr Teller (BET) Procedure. The morphology of raw and modified fly ash was observed using transmission electron microscope (TEM). The grain size of raw and modified fly ash were determined. Dye removal from simulated dyeing waste water and actual dyeing wastewater was experimented. The influence factors and the appropriate condition to treat different wastewater were also examined. At last, the mechanism of wastewater treatment was investigated.The experiment results showed that adsorption isotherms fit to the Langmuir isotherm. The zeta potentials of PDMDAAC-fly ash changed from negative to positive, which indicates adsorbed PDMDAAC change the surface electric properties of fly ash. The granular and specific surface area of PDMDAAC-fly ash changed little, and flocs appeared around the particles from the TEM photos. The particles size of PDMDAAC-fly ash became bigger with the increase of modification temperature and PDMDAAC concentration than raw fly ash. The efficiencies of PDMDAAC-fly ash for color and COD removal were greater than raw fly ash. The results also indicate that the mechanism in wastewater treatment of modified fly ash is the synthetic effect of charge neutralization and adsorption bridging. It is a new way to reuse fly ash.