PAN Yiming, YAN Shu, TANG Xinyue, WANG Qinggang, WANG Xiuhui, YANG Jinlong
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In this paper, effects of calcining temperature, microspheres dosage, concentration of dye and contact time on the adsorption properties of methly violet and malachite green of coal gangue microspheres were investigated. Coal gangue microspheres were made by spray drying method and subsequent calcination. Researches showed that the surface of coal gangue microspheres was fluffy and porous, the flaky tissue was mixed and disorderly arrangement on the surface. With the increase of calcining temperature (800-1 000 ℃), the adsorption capacity on methly violet and malachite green was decreased, and the adsorption capacity and removal efficiency of methyl violet for microspheres calcined after 800 ℃ were 16.2 mg/g and 95.5%, respectively. And for malachite green, the adsorption capacity and removal efficiency were 9.5 mg/g and 94.6%. With the increase of contact time and initial concentration, the adsorption capacity of methyl violet and malachite green for microspheres was increased, whereas with the increase of coal gangue dosage, the adsorption capacity was decreased. The progress of adsorption could be described by the pseudo-second-order kinetic model. The adsorption on methyl violet conforms to the Langmuir model, and value of RL (0<RL<1) indicates that the Langmuir isotherm is favorable. The adsorption on malachite green conforms to the Freundlich model, and value of 1/n (0<1/n<1) indicates that the Freundlich isotherm is favorable. When methyl violet and malachite green were filtered with coal gangue filter, the adsorption capacity and removal efficiency of methyl violet were 15.1963 mg/g and 99.1061% and the adsorption capacity and removal efficiency of malachite green were 8.8284 mg/g and 94.5903%.