Title :
Enhanced Photocatalytic Degradation of Humic Acid in Fe2O3 Aqueous Suspension by Increasing Ca²+ Strength under a Blue Light Irradiation
Author :
Ding, Guangyue ; Li, Caixia ; Fan, Caimei ; Sun, Yanping
Author_Institution :
Coll. of Chem. & Chem. Eng., Taiyuan Univ. of Technol., Taiyuan, China
Abstract :
Abstract-This study aimed at improving the photocatalytic oxidation of humic acids (HA) in α-Fe2O3suspensions by adding calcium cationic ion (Ca2+). A visible light photocatalyst of α-Fe2O3 was prepared by co-precipitation method and characterized by X-ray diffraction (XRD) and scanning electron microscope (SEM). First a set of tests was conducted in the dark to study the adsorption of HA onto α-Fe2O3in suspensions at different calcium concentrations. Then the photocatalytic degradation of HA under blue light irradiation was investigated in the presence of calcium ion. A set of comparison of photolysis, adsorption, photocatalysis was also studied. The results showed that the adsorption behavior between HA and α-Fe2O3played a very important role during the photocatalytic oxidation process. The photocatalytic oxidation could be enhanced at neutral pH by increasing the cation strength. The present findings may be valuable for the treatment of HA in natural water under solar light irradiation.
Keywords :
X-ray diffraction; adsorption; catalysis; chemical engineering; oxidation; photochemistry; precipitation; scanning electron microscopy; suspensions; Ca; Fe2O3; SEM; X-ray diffraction; XRD; adsorption; aqueous suspension; blue light irradiation; calcium cationic ion; co-precipitation method; humic acid; photocatalytic degradation; photocatalytic oxidation; photolysis; scanning electron microscope; Calcium; Chemical engineering; Chemical technology; Chemistry; Educational institutions; Oxidation; Purification; Solar energy; Sun; Thermal degradation;
Conference_Titel :
Bioinformatics and Biomedical Engineering (iCBBE), 2010 4th International Conference on
Conference_Location :
Chengdu
Print_ISBN :
978-1-4244-4712-1
Electronic_ISBN :
2151-7614
DOI :
10.1109/ICBBE.2010.5515636