Alternative View of Chlorine Oxidation Stimulated by Longer Wavelength Light
| Autor: | Maryam Izadifard, Gopal Achari, Cooper H. Langford |
|---|---|
| Rok vydání: | 2016 |
| Předmět: |
Environmental Engineering
0208 environmental biotechnology Inorganic chemistry Hypochlorite chemistry.chemical_element 02 engineering and technology 010501 environmental sciences Photochemistry medicine.disease_cause 01 natural sciences chemistry.chemical_compound medicine Chlorine Environmental Chemistry Organic matter Irradiation Absorption (electromagnetic radiation) 0105 earth and related environmental sciences General Environmental Science Civil and Structural Engineering chemistry.chemical_classification Advanced oxidation process 020801 environmental engineering chemistry Degradation (geology) Ultraviolet |
| Zdroj: | Journal of Environmental Engineering. 142 |
| ISSN: | 1943-7870 0733-9372 |
| DOI: | 10.1061/(asce)ee.1943-7870.0001124 |
| Popis: | Aqueous chlorine (Cl2, OCl−, Cl−) in combination with longer wavelength ultraviolet (UV) irradiation has been investigated as a potential advanced oxidation process (AOP) for water and wastewater treatment. The cases include bleaching of organic matter (NOM) and oil sands tailing pond water (OSPW) under sunlight irradiation. Surprisingly, low energy tail of OCl− (Amax at 290 nm) has been postulated to be responsible for degradation of organic components. An alternative photoreaction, potentially more photon efficient, postulates absorption by strongly absorbing chromophores of target compounds present in water, which then undergo reaction in their excited states. This alternate hypothesis was tested in the current study under 440 nm light-emitting diode (LED) irradiation, where chlorine species have no absorption, using Swannee River fulvic acid (SRFA), an oil sands process water, and by bleaching of a coumarin dye. All results show substantial enhancement of hypochlorite oxidation processes under... |
| Databáze: | OpenAIRE |
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