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Humic acid removal from micro-polluted source water in the presence of inorganic salts in a gas-phase surface discharge plasma system
- Source :
- Separation and Purification Technology. 187:334-342
- Publication Year :
- 2017
- Publisher :
- Elsevier BV, 2017.
-
Abstract
- Humic acid (HA), a predominant type of natural organic matter in surface water, had several potential environmental and health risks. A gas phase surface discharge plasma system was employed to eliminate HA from micro-polluted surface water, and the effects of some concomitant inorganic ions on HA removal were evaluated. The experimental results showed that approximately 89.4% of HA could be smoothly eliminated after 40 min of the discharge plasma treatment, and the HA removal process could be fitted well by the first-order kinetic model. The presence of anions such as CO32− and Cl− in the natural water were adverse for the HA removal due to their competition for the active species, whereas the effects of NO3− and SO42− on the HA removal could be neglected; this deduction was also confirmed via the evolution of fluorescence spectra intensity of OH radicals. Although Cu2+ could react with H2O2 via Fenton-like reaction, its presence was still adverse for the HA removal due to the complexing effect of Cu2+ with HA molecules. In addition, the HA removal processes were characterized by UV–Vis spectrum, DOC removal, specific absorbance parameters, and three-dimensional fluorescence spectrum analysis.
- Subjects :
- chemistry.chemical_classification
021110 strategic, defence & security studies
Chemistry
Radical
Inorganic chemistry
0211 other engineering and technologies
Filtration and Separation
02 engineering and technology
Plasma
010501 environmental sciences
Inorganic ions
01 natural sciences
Fluorescence
Analytical Chemistry
Absorbance
Molecule
Humic acid
Surface water
0105 earth and related environmental sciences
Subjects
Details
- ISSN :
- 13835866
- Volume :
- 187
- Database :
- OpenAIRE
- Journal :
- Separation and Purification Technology
- Accession number :
- edsair.doi...........cc417847e5ac137d3d3afb4761c9cd60