Pyrite nanoparticles with different crystallinity were prepared by wet mechanochemical synthesis combined with heat treatment,and their adsorption properties for methylene blue were studied.The morphology,crystal structure and specific surface area of the prepared nano-pyrite were characterized by FESEM,XRD and BET.The effects of crystallinity,initial concentration of methylene blue,initial pH,interfering ions and dissolved oxygen on the adsorption capacity of pyrite were investigated.The results showed that the crystallinity and adsorption capacity of pyrite nanoparticles increased and decreased with the increase of calcination temperature,respectively.The adsorption capacity of FeS2 increased gradually with the increase of initial concentration of methylene blue and eventually reached a stable value.The optimal pH environment for adsorption of pyrite with different crystallinity is different.With the increase of pyrite crystallinity,the optimal pH environment for pyrite adsorption changes from acidic to alkaline.The stable interfere ions have little influence on that adsorption process,and carbonate ions can keep the solution a strong alkaline environment and improve the adsorption performance of the pyrite.The dissolved oxygen content in the system can affect the oxidation degree of pyrite surface and produce negative ion sites,thus improving the adsorption performance of the pyrite.The adsorption data of synthesized FeS2 fitted well with Langmuir adsorption model.The adsorption kinetics of FeS2 with low crystallinity followed pseudo second order model,while that with high crystallinity followed pseudo first order model.In general,the mechanochemical synthesis of pyrite nanoparticles can effectively remove methylene blue from water,and has a good application prospect.
关键词
纳米黄铁矿(FeS2)/吸附/结晶度/机械化学合成/亚甲基蓝
Key words
nanoscale pyrite(FeS2)/adsorption/crystallinity/mechanochemical synthesis/methylene blue
维普
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