Photocatalytic Treatment of Wastewater Containing Simultaneous Organic and Inorganic Pollution: Competition and Operating Parameters Effects

Catalysts

Salah Jellali¹  Atef El Jery²  Nasser Ben Harharah Hamed²  Lotfi Khezami³  Aymen Amine Assadi⁴  Abdeltif Amrane⁴  Ahmed Amine Azzaz⁵ 

[1] Center for Environmental Studies and Research, PEIE Research Chair for the Development of Industrial Estates and Free Zones, Sultan Qaboos University, Al-Khoud 123, Oman;Department of Chemical Engineering, College of Engineering, King Khalid University, Abha 61411, Saudi Arabia;Department of Chemistry, College of Sciences, Imam Mohammad Ibn Saud Islamic University, P.O. Box 5701, Riyadh 11432, Saudi Arabia;Ecole Nationale Supérieure de Chimie de Rennes, Université de Rennes, CNRS, ISCR-UMR 6226, 35000 Rennes, France;Environnements DYnamiques et TErritoires de la Montagne, Université Savoie Mont-Blanc, EDYTEM, 5 Boulevard de la Mer Caspienne, 73370 Le Bourget-du-Lac, France;

关键词: combined pollution;    methylene blue;    heavy metal;    adsorption;    photocatalysis;   

DOI  :  10.3390/catal11070855

来源: DOAJ

【 摘 要 】

In the present study, methylene blue (MB) removal from aqueous solutions via the photocatalytic process using TiO₂ as a catalyst in the presence of external ultra-violet light (UV) was investigated. The results of adsorption in the absence of UV radiation showed that adsorption reached an equilibrium state at 60 min. The experimental kinetic data were found to be well fitted by the pseudo-second-order model. Furthermore, the isotherm study suggested that dye uptake by TiO₂ is a chemisorption process with a maximum retention capacity of 34.0 mg/g. The photodegradation of MB was then assessed under various experimental conditions. The related data showed that dye mineralization decreased when dye concentrations were increased and was favored at high pH values and low salt concentrations. The simultaneous presence of organic and inorganic pollution (Zinc) was also evaluated. The effect of the molar ratio Zn²⁺/MB⁺ in the solution at different pH values and NaCl concentrations was also monitored. The corresponding experimental results showed that at low values of Zn²⁺ in the solution (30 mg/L), the kinetic of the MB removal became faster until reaching an optimum at Zn²⁺/MB⁺ concentrations of 60/60 mg/L; it then slowed down for higher concentrations. The solutions’ carbon contents were measured during the degradation process and showed total mineralization after about 5 h for the optimal Zn²⁺/MB⁺ condition.

【 授权许可】

Unknown