Photodegradation of malachite green using UV–vis light from two microwave-powered electrodeless discharge lamps (MPEDL-2): Further investigation on products, dominant routes and mechanism
| Autor: | Jiande Fang, Cheng Sun, Zhencheng Xu, Shaogui Yang, Xiaochun Peng, Yongming Ju, Junqin Qiao |
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| Rok vydání: | 2013 |
| Předmět: |
Gas-discharge lamp
Aqueous solution General Chemical Engineering Photodissociation Advanced oxidation process General Chemistry Photochemistry Industrial and Manufacturing Engineering law.invention chemistry.chemical_compound Ultraviolet visible spectroscopy chemistry law Environmental Chemistry Irradiation Malachite green Photodegradation |
| Zdroj: | Chemical Engineering Journal. 221:353-362 |
| ISSN: | 1385-8947 |
| DOI: | 10.1016/j.cej.2012.06.055 |
| Popis: | In this research, we choose photolysis degradation (PD) course and H2O2-enhanced PD (HPD) course using UV–vis light from two microwave-powered electrodeless discharge lamps (MPEDL-2) as simplified models. The results verified that (1) ∼70% and 99.7% of MG were removed in PD and HPD courses within 5 min irradiation, and PD course was proved to be dependent on OH and O2-, (2) major routes were related to transformation of MG into malachite green carbinol base (MGCB), which could be further decomposed into 4-dimethylaminobenzophenone (DLBP), and (3) after 0.5 min irradiation, PD course verified that ∼30% and 1% of MG was converted into MGCB and DLBP; for comparison, HPD course demonstrated that ∼12.9% and 28.5% of MG was transformed into MGCB and DLBP. Accordingly, we draw conclusions that degradation mechanism of MG could be revised as seven steps with MGCB as a key product and pH variation of aqueous dyes solution played minor role. Additionally, these conclusions were also enlightened for degradation of MG by advanced oxidation process. |
| Databáze: | OpenAIRE |
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