1. Humic acid removal from micro-polluted source water in the presence of inorganic salts in a gas-phase surface discharge plasma system
- Author
-
Hong Qiang, Tiecheng Wang, Chungang Li, Qiuhong Sun, Shibin Hu, Qianrou Zhang, Guangzhou Qu, and Dongli Liang
- 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 - 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.
- Published
- 2017