Abstract
The photocatalytic degradations of benzoic acid, phenol and salicylic acid were examined subsequent to in situ adsorption/desorption of the organic substrates on a TiO 2-coated quartz crystal microbalance (QCM). The amount of substrate adsorbed from the bulk aqueous solution on the TiO 2-coated QCM sensor was investigated at different pH under dark conditions. The order of adsorption was salicylic acid > phenol ∼ benzoic acid on the acidic side; phenol > benzoic acid > salicylic acid under neutral conditions; benzoic acid > phenol ∼ salicylic acid in alkaline media. Salicylic acid was an intermediate in the photodegradation of benzoic acid.
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