PHOTODEGRADATION OF SURFACTANTS .8. COMPARISON OF PHOTOCATALYTIC PROCESSES BETWEEN ANIONIC SODIUM DODECYLBENZENESULFONATE AND CATIONIC BENZYLDODECYLDIMETHYLAMMONIUM CHLORIDE ON THE TIO2 SURFACE
PHOTODEGRADATION OF SURFACTANTS .8. COMPARISON OF PHOTOCATALYTIC PROCESSES BETWEEN ANIONIC SODIUM DODECYLBENZENESULFONATE AND CATIONIC BENZYLDODECYLDIMETHYLAMMONIUM CHLORIDE ON THE TIO2 SURFACE
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DOI：
10.1021/j100184a037
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发表时间：
1992-03-05
影响因子：
--
通讯作者：
SERPONE, N
中科院分区：
文献类型：
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作者：
HIDAKA, H;ZHAO, J;SERPONE, N
阴离子DB和阳离子BDDAC表面活性剂在HG-LAMP辐照下的空气平衡水平TiO2分散液中分解光催化。 检查了芳香族部分的裂解，过氧化物和醛的中间体以及对CO2的最终矿化的DBS，并与BDDAC的矿化进行了比较。 阴离子DBS光降解比阳离子BDDAC快。 表面活性剂结构中的芳族部分比烷基链更快地分解。 使用自旋陷阱（DMPO）ESR光谱法获得了反应性.OH自由基的证据。 通过Langmuir-Hinshelwood模型讨论了光降解动力学。 基于实验结果提出了光降解机制。
Anionic DBS and cationic BDDAC surfactants were decomposed photocatalytically in air-equilibrated aqueous TiO2 dispersions under Hg-lamp irradiation. The cleavage of the aromatic moiety, the intermediacy of peroxides and aldehydes, and the ultimate mineralization to CO2 were examined for DBS and compared to those of BDDAC. The anionic DBS photodegrades faster than the cationic BDDAC. The aromatic moiety in the surfactant structure is decomposed more rapidly than the alkyl chain. Evidence for the formation of reactive .OH radicals was obtained using spin-trapping (DMPO) ESR spectroscopy. The photodegradation kinetics are discussed in terms of Langmuir-Hinshelwood model. A photodegradation mechanism is proposed on the basis of the experimental results.