Mechanisms of simultaneous hydrogen production and estrogenic activity removal from secondary effluent though solar photocatalysis

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• 作者：Wenlong Zhang ; Yi Lip> ; p>p>envly@hhu.edu.cnp> ; Chao Wang ; Peifang Wang ; Qing Wang ; Dawei Wang
• 关键词：Photocatalysis ; Hydrogen production ; Estrogenic activity ; Dissolved oxygen ; Organic matter ; Inorganic ions
• 刊名：Water Research
• 出版年：2013
• 出版时间：1 June, 2013
• 年：2013
• 卷：47
• 期：9
• 页码：3173-3182
• 全文大小：876 K

文摘

The mechanisms of simultaneous photocatalytic hydrogen production and estrogenic activity (EA) removal from secondary effluent were investigated by evaluating the effects of initial dissolved oxygen (DO), organic matter, and inorganic ions on the process. The photocatalytic process was enhanced and can be divided into two phases according to the availability of DO. In aerobic phase, the humic/fulvic-like compounds in hydrophilic substances fraction were preferentially decomposed by aerobic photo-formed reactive oxygen species (i.e. , hp>+p>, and OH) with generation of electron donors (i.e. formaldehyde, acetaldehyde, acetate, and formate). Approximately 41 % of dissolved organic carbon and 90 % of EA were reduced in the aerobic phase. In the following anoxic phase, the hydrogen production was significantly improved (apparent photonic efficiency 3.04?¡Á?10p>?3p>) by the generated electron donors and accompanied with completely EA removal by the anoxic photo-formed OH. Hydrogen production was enhanced with the presence of low concentrations of (below 0.1?mmol/L) and (below 0.2?mmol/L) through accelerating electrons accumulation while it was inhibited at high concentrations since the formed ion-radicals could not decompose humic/fulvic-like compounds. EA removal was inhibited by and through scavenging hp>+p>/$OH. The presence of (below 1?mmol/L) only resulted in minor impacts since was almost unreactive toward electronor OH in neutral conditions.