A Method for Detecting the Effect of Electron Beam Irradiation on Coal Free Radical Concentration Using Electron Paramagnetic Resonance
A technology of electron paramagnetic resonance and electron beam irradiation, which is applied in the direction of using electron paramagnetic resonance for analysis, etc., and can solve problems such as the study of free radical changes in coal samples.
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[0021] The steps of this embodiment are as follows:
[0022] (1) Pretreatment of coal samples: First, the coal particles are ground to below 20 μm, then washed with 1M NaOH solution and filtered to remove the original oil in the coal. The washed coal sample was dried to constant weight under vacuum 393K to obtain dry coal powder, which was sealed and bagged.
[0023] (2) Irradiate the coal sample with electron beam: use the GJ-2-II high-frequency high-voltage electron accelerator provided by the Institute of Ray Application of Shanghai University to irradiate the coal sample that has been pretreated in step a, and the obtained dose is 10kGy , 20kGy, 30kGy, 40kGy, 50kGy coal samples.
[0024] (3) Carry out ESR test on the coal samples before and after electron beam irradiation: accurately weigh 15mg of the sample, put it into a sample tube, and obtain the spectrum of line width, line shape, g factor, hyperfine coupling and spin concentration through ESR test parameter. ESR e...
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