The Study On The Adsorption Of Phenolic Wastewater By Modified Bentonite

Phenolic compounds are common contaminants in wastewaters, being generated from petroleum and petrochemical, coal conversion, and phenol-producing industries. Phenols are considered as priority pollutants since they are harmful to organisms at low concentrations and many of them have been classed as hazardous pollutants because of their potential harm to human health. At present, many researches have been focused on finding an effective way to deal with this kind of wastewater with low cost. For dealing with phenolic wastewater, the common ways are extraction by solvent, adsorption by adsorbent, electrolysis and biochemistry. Among these methods, adsorption has been considered as an effective one for the treatment of phenolic wastewater with low concentration of phenol. The common adsorbents are active carbon, colophony with pore and layered silicate clay. Up to now, active carbon and colophony are the super adsorbents. But they are all high cost adsorbents that are limited their used in industry. Compared with active carbon and colophony, bentonite is a kind of low cost adsorbent and the application of bentonite in the treatment of phenolic wastewater has been studied by many researchers around the world.In this work, a new absorbent of bentonite was prepared and the adsorption characteristics were studied. Several kinds of solvent were used to destroy the crystalline structure of bentonite. The distant layer of bentonite and...