Iranian Journal of

Background and Objectives: Many industrial effluent plants contain amounts of hard biodegradable compounds such as  β-naphthol which can be removed by conventional treatment systems. The objective of this research is to treat wastewater containing naphthalene by nano titanium oxide coated on activated carbon.
Materials and Methods: Photocatalytic experiments were carried out for different concentrations of β-naphthol using time and pH as dependent factors.  Nano TiO2 coated on activated carbone in one liter batch reactor and the resultants compounds' concentration were measured in a photocatalytic reactor  with UV-C of 12 Watt. 
Results: The experimental results indicated that UV/ nano TiO2  coated on activated carbone removed 92% of β-naphthol with concentrations of 100 mg/L within an overall elapsed time of three hours. β-naphthol total removal with concenteration of 25 mg/L was observed in two hours.
Conclusions: UV/ nano TiO2  process is very fast and effective method for removal of β-naphthol and  pH 11 was indicated as the optimum pH.