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|Title: ||Enhancement of photocatalytic oxidation of humic acid in Tio₂suspensions by increasing cation strength|
|Authors: ||Li, Xiang-zhong|
Fan, C. M.
Sun, Y. P.
|Subjects: ||Photocatalytic oxidation|
|Issue Date: ||Jul-2002 |
|Publisher: ||Pergamon (Elsevier)|
|Citation: ||Chemosphere, July 2002, v. 48, no. 4, p. 453-460.|
|Abstract: ||This study aimed at improving the photocatalytic (PC) oxidation of humic acids (HA) in TiO₂suspensions by adding cationic ion such as calcium or magnesium. A set of tests was first conducted in the dark to study the adsorption of HA onto TiO₂in suspensions at different pH and calcium concentrations. The experiment demonstrated that the adsorption of HA onto the TiO₂particles was either pH-dependent or calcium strength-dependent due to electrostatic interaction and calcium ion bridging. The photodegradation of HA in the presence of UV irradiation was investigated as a function of pH and the concentration of calcium and magnesium ions. The results showed that the adsorption behavior between
HA and TiO₂played a very important role during the PC oxidation process. The PC oxidation could be enhanced at neutral pH by increasing the cation strength. The kinetics of HA PC degradation in TiO₂suspensions with different initial concentrations was also studied using the Langmuir–Hinshelwood model.|
|Description: ||DOI: 10.1016/S0045-6535(02)00135-2|
|Rights: ||Chemosphere © 2002 Elsevier Science Ltd. The journal web site is located at http://www.sciencedirect.com.|
|Type: ||Journal/Magazine Article|
|Appears in Collections:||CEE Journal/Magazine Articles|
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