TY - JOUR
T1 - Photocatalytic reduction of hexavalent chromium over ZnO nanorods immobilized on kaolin
AU - Shirzad-Siboni, Mehdi
AU - Farrokhi, Mehrdad
AU - Darvishi Cheshmeh Soltani, Reza
AU - Khataee, Alireza
AU - Tajassosi, Sama
PY - 2014/1/22
Y1 - 2014/1/22
N2 - The photocatalytic reduction of hexavalent chromium (Cr(VI)) using ZnO nanorods immobilized on kaolin clay was studied. Scanning electron microscopy (SEM) and Fourier transform infrared (FT-IR) analysis demonstrated favorable immobilization of ZnO nanorods onto the kaolin. The efficiency of the UV/ZnO/kaolin process for reduction of Cr(VI) was about 88.0%, which was more effective than the UV/ZnO process (43.7%). The photocatalytic reduction of Cr(VI) was increased from 35.7 to 97.1%, with increasing photocatalyst dosage from 0.25 to 3 g/L, respectively. The reaction rate constant (kobs) was decreased from 0.0769 to 0.0072 1/min, and the value of electrical energy per order (EEo) was increased from 62.4 to 666.7 (kW·h/m3) with increasing initial Cr(VI) concentration from 10 to 50 mg/L, respectively. The photocatalytic reduction of Cr(VI) was increased from 88.3 to 98.5% in the presence of citric acid, while the presence of phenol, ethylenediaminetetraacetic acid and oxalic acid resulted in decreasing the photocatalytic reduction of Cr(VI) to 70.2, 53.2, and 36.4%, respectively.
AB - The photocatalytic reduction of hexavalent chromium (Cr(VI)) using ZnO nanorods immobilized on kaolin clay was studied. Scanning electron microscopy (SEM) and Fourier transform infrared (FT-IR) analysis demonstrated favorable immobilization of ZnO nanorods onto the kaolin. The efficiency of the UV/ZnO/kaolin process for reduction of Cr(VI) was about 88.0%, which was more effective than the UV/ZnO process (43.7%). The photocatalytic reduction of Cr(VI) was increased from 35.7 to 97.1%, with increasing photocatalyst dosage from 0.25 to 3 g/L, respectively. The reaction rate constant (kobs) was decreased from 0.0769 to 0.0072 1/min, and the value of electrical energy per order (EEo) was increased from 62.4 to 666.7 (kW·h/m3) with increasing initial Cr(VI) concentration from 10 to 50 mg/L, respectively. The photocatalytic reduction of Cr(VI) was increased from 88.3 to 98.5% in the presence of citric acid, while the presence of phenol, ethylenediaminetetraacetic acid and oxalic acid resulted in decreasing the photocatalytic reduction of Cr(VI) to 70.2, 53.2, and 36.4%, respectively.
UR - http://www.scopus.com/inward/record.url?scp=84892953782&partnerID=8YFLogxK
U2 - 10.1021/ie4032583
DO - 10.1021/ie4032583
M3 - Article
AN - SCOPUS:84892953782
SN - 0888-5885
VL - 53
SP - 1079
EP - 1087
JO - Industrial and Engineering Chemistry Research
JF - Industrial and Engineering Chemistry Research
IS - 3
ER -