2.3.3. Measurements of adsorption amount of dispersants on coal surface

The adsorption capacity of dispersant was analysed by using a Cary-60 ultraviolet spectrophotometer (Agilent, USA). A series of dispersant solutions were prepared and measured to build the calibration curve. Then, 20 ml dispersant solutions of different concentration were mixed with 0.5 g blend coal sample and vibrated in a water bath at 25°C for 5 h. The suspension was centrifuged at 8000 r.p.m. for 10 min, and the supernatant was filtered to remove coal particles. The concentration of residue dispersant in the supernatant was measured by ultraviolet spectrophotometer. Coal-water suspensions were used as the blank sample. The adsorption amount of dispersant was calculated by following equation (2.1).

where Г (mg g−1) is adsorbed dispersant on unit mass coal sample, Co (mg ml−1) is original mass concentration of dispersant solution, Cr (mg ml−1) is residue mass concentration of dispersant solution after adsorption, Cblank (mg ml−1) is the mass concentration of blank sample, V (ml) is the volume of dispersant solution, m (g) is the mass weight of coal sample.

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