In this section, you can access to the latest technical information related to the FUTURE project topic.

Tribocharging of macerals with various materials: Role of surface oxygen-containing groups and potential difference of macerals

Triboelectrostatic separation of vitrinite and inertinite depends on their differences in tribocharging behavior. In the present study, charge-to-mass ratios of two macerals with six tribocharging materials, i.e., aluminum, stainless steel, copper, polyethylene terephthalate (PET), polyvinyl chloride (PVC), polyamide (PA) were conducted for the first time under various environmental factors. PA was found to be the preferred material for tribocharging because vitrinite and inertinite displayed opposite charge polarity with it. Characterization of surface oxygen-containing groups on macerals and their quantitative estimation were conducted by X-ray photoelectron spectroscopy (XPS) technique. Polar groups such as OH and COOH were detected to be the major proportion in inertinite whereas vitrinite exhibited mainly nonpolar groups of O, which indicate tendency of their surface charge. For the first time, atomic force microscopy (AFM) was utilized to investigate the surface topography and potential difference of macerals. Inertinite showed 0.42?V higher surface potential than vitrinite, which well fits with their charge polarity and movement during triboelectrostatic separation. However, the instability of surface potential difference on inertinite may leads to disorder in its charge polarity, which makes Cu as an alternative material because both macerals have great charge gap with Cu and they also have same charge polarity.

» Author: Xin He, Hao Sun, Bin Zhao, Xiaowei Chen, Xinxi Zhang, Sridhar Komarneni

» Reference: 10.1016/j.fuel.2018.06.109

» Publication Date: 01/12/2018

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