Author/Authors :
Dehghan-Rahimi, Azadeh Department of Marine Chemistry - Faculty of Marine Science - Chabahar Maritime University, Iran , Zahedi, Mir Mahdi Department of Marine Chemistry - Faculty of Marine Science - Chabahar Maritime University, Iran , Ziyaadini, Morteza Department of Marine Chemistry - Faculty of Marine Science - Chabahar Maritime University, Iran
Abstract :
ZnAl2O4 and Sr-doped ZnAl2O4 nanoparticles were synthesized by co-precipitation
using ammonia as precipitating agent, followed by thermal treatment at 700°C. X-ray
diffraction (XRD), field emission scanning electron microscopy (FE-SEM), and the
Brunauer-Emmett-Teller (BET) were employed to clarify the structure and morphology
of the samples. In addition, the presence of Sr in Sr-doped ZnAl2O4 NPs was further
evidenced from energy-dispersive X-ray analysis (EDX). The Photocatalytic activity
of ZnAl2O4 and Sr-doped ZnAl2O4 nanoparticles were evaluated in the photocatalytic
degradation of 2,4-dichlorophenol (2,4-DCP) in aqueous media under the
UV irradiation technique. The effect of various parameters, including catalyst dosage,
2,4-DCP concentration, pH, and temperature, on the degradation of 2,4-DCP was
investigated. With 0.6 wt% Sr doped ZnAl2O4 samples after 60 min irradiation, 100%
of 2,4-DCP photodegradation was observed in acidic conditions, while with undoped
ZnAl2O4 samples only 67% 2,4-DCP was removed upon UV irradiation for 200 min.
The reusability of the catalyst was examined under optimized conditions. The results
demonstrate that Sr-doped ZnAl2O4 nanoparticles exhibit considerably high catalytic
stability with more than 90% degradation after the third catalytic cycle
Keywords :
2,4-Dichlorophenol , Photocatalytic degradation , Sr-doped ZnAl2O4 nanoparticles
