Abstract
The mechanochemical method is a potential way to destroy pollutants such as heavy metals and organic compounds due to its advantages such as complete reaction, adaptation of various pollutants and low energy consumption, etc. Research work was conducted to investigate the feasibility of remediating the persistent organic pollutants (POPs) contaminated soil and how the parameters influence the destruction of the pollutants. In the study, hexachlorobenzene (HCB) was used as a presentative of the POPs in soil. Natural minerals such as albite and magnetite were selected as additives to treat HCB contaminated soil with the application of mechanochemical method. The reasonable operation parameters as well as the soil properties on the destruction of HCB were determined. Analysis such as Fourier Transform Infrared Spectroscopy (FTIR), X-ray diffractometer (XRD), X-ray Photoelectron Spectroscopy (XPS) and Raman Spectrometer were conducted for the supplement of mechanism study. A degradation rate of 92.5% for HCB was achieved under the optimal reaction condition. According to the XPS analysis results, the transformed valence state of iron, provided electrons for the destruction of HCB, on the basis of specific structure of albite. The amorphous carbon and graphite carbon were the final products of the destruction of HCB in the process of ball milling. The selected reagents with albite and magnetite would be viable for the damage of other POPs by mechanochemical method.
Highlights
A wide range of industrial products, resulting in complex pollution components, including a variety of heavy metals and organic pollutants, and the toxicity of persistent organic pollutants (POPs) to organisms has aroused wide concern [1]
Albite and magnetite were chosen as the co-milling reagents to improve the damage effect of HCB in soil through mechanochemical method
Different operation parameters were taken into consideration: rotational speed, material ratio, ball material ratio, ratio of different ball size and milling time
Summary
A wide range of industrial products, resulting in complex pollution components, including a variety of heavy metals and organic pollutants, and the toxicity of persistent organic pollutants (POPs) to organisms has aroused wide concern [1]. The problem of soil pollution caused by product circulation, production leakage and abandoned factory field is very serious [2,3,4], the research of soil remediation has become a hot spot. The rapid remediation technologies of soil contaminated by organic pollutants cover extensively, including chemical reduction oxidation [5,6,7], soil leaching technology [8], photocatalytic degradation [9, 10,11], plasma photolysis and so on, with various requirements for the contaminated site. To explore soil remediation technologies with high efficiency and environment protection has become a top priority
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