Adsorption of Phenol Chemicals by Surfactant-Modified Zeolites
表面活性剂改性沸石对水中酚类化合物吸附性能研究

Two kinds of zeolites were prepared from fly ash and modified by surfactant subsequently. Surfactant-modified zeolites were studied for adsorption of phenol chemicals (phenol, p-chlorphenol, bisphenol A). It showed that the adsorption affinity of zeolite to phenol chemicals was significantly improved after surfactant modification. The adsorption isotherms of phenol chemicals were well fitted by the Langmuir isotherm. For the two surfactant-surfactant modified zeolites, the maximum adsorption amounts of phenol, p-chlorphenol, and bisphenol A calculated from the Langmuir equation were 37.7, 52.36, 90.9 mg·g-1 and 10.7, 22.83, 56.8 mg·g-1, respectively. When pH values of solutions were higher than the pKa values of phenol chemicals, the removal efficiencies were getting higher with the increase of pH values. The octanol/water partition coefficient (Kow) was also found to be an important factor affecting adsorption of phenol chemicals by the modified zeolites. Higher Kow value, which means the greater hydrophobicity of the chemicals, resulted in a higher removal.