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Experimental Study on Photocatalystic Degradation of Humic Acid and Phenol in Drinking Water Source

Author: AnYanTao
Tutor: ShiWenZuo；YuShuiLi
School: Harbin Institute of Technology
Course: Municipal Engineering
Keywords: photocatalysis TiO2 modification HA phenol
CLC: TU991.2
Type: Master's thesis
Year: 2008
Downloads: 60
Quote: 1
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Abstract


In this experiment the photocatalyst are made by sol-gel method. SiO2 was chosen as support and TiO2 was loaded on SiO2, with TiO2 doping N. HA was used as photocatalysis subject. Phenol was used to study the mechanism of photocatalysis.Using XRD, FTIR, UV-VIS as method to characterize the photocatalyst. Study the photocatalysis activity of prepared photocatalyst using different sintering temperature and prepared methods, comparing with P25 TiO2. The result indicated that structure of photocatalyst was changed by modification, and the absorbing wavelength was enhanced to visible light wavelength. 500℃was the best sintering temperature, having the similar photocatalysis with P25. Modified TiO2 and not modified TiO2 under visible light were compared to indicate result of modification.The capability of adsorption and photo degradation was compared. And influent factors such as aeration. HA concentrations, concentration of photocatalyst were discussed. As while the kinetics of photocatalysis, repeated using of photocatalyst and applied of photocatalysis to Songhua River were studied. The experiment result indicated that adsorption can only remove 20% HA while photocatalysis 90%, using aeration can get more efficiency, to concentrated HA the reaction rate incresed, the best photocatalyst concentration to 10mg/L HA was 1.0g/L. Photocatalytic oxidation of HA matched well with adsorption balance constant modified first-order kinetics. Photocatalyst could be repeatedly used, after 6 times, removal of HA decreased about 10%. Removal of TOC was 70% in photocatalysis. AOC was raised at first, after 30 min it was reduced by photocatalysis. SUVA254 decreased continuously, showing the structure of organics was changed. The molecular weight distribution showed molecular weight reduced gradually.The study of Songhua River showed 0.5g/L was the best photocatalyst concentration. Removal of TOC was about 65%, IC and TC were also decreased. SUVA254 was used as predicted value of THMs, SUVA254 was reduced, indicating the production of THMs suppressed. Photocatalyst concentration, initial phenol concentration, pH value and ion had influence on photocatalysis. Studied kinetics of photocatalysis to phenol, speculated the mechanism of photocatalysis of phenol and demonstrated exist of phenol had effect on HA removal. It showed that 0.5g/L was the best concentration of photocatalyst, when pH=3 photocatalysis had more efficiency, Ca2+ and Mg2+ suppressed photocatalysis, reaction rate increased with the increase of phenol concentration. Photocatalysis of phenol matched zero–order kinetics, reaction rate constant had a liner correlation of phenol concentration. By adding t-butyl alcohol, investigated photocatalysis mechanism, it showed hole was as important as hydroxyl radical in oxdiating organics. And phenol suppressed the removal of photocatalysis degradating HA.

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CLC: > Industrial Technology > Building Science > Municipal Engineering > Water supply project ( on the Water Works ) > Clean Water ( water treatment )
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