Firstly,the dry surface modification of fly ash (FA) was carried out with γ-methylacrylloxy propyl trimethoxysilane (KH570).Then a pot of hydrothermal loading of Fe3O4 onto the surface of modified FA was used.Finally,using ammonium persulfate as initiator and mixed solution of water and ethanol as reaction phase,the acrylamide monomer was successfully grafted and polymerized onto the surface of Fe3O4/FA particles to prepare magnetic fly ash/polyacrylamide composite (MFA-PAM),which was applied to the adsorption of methylene blue(MB).The resulted composite particles were characterized by FT-IR,TGA,XRD,VSM and SEM.The results shown that the target functional group can be successfully grafted on to FA.The composite particles were well wrapped by PAM.Adsorption behavior of MB in aqueous solution by MFA-PAM was studied by UV-Vis spectrophotometry.It was found that,decolourization ratio of 25ml MB solution (6mg/L) with 0.12g MFA-PAM reached 77.6% with in 10 minutes and reached 90.3% with in 120 minutes.In addition,the adsorption efficiency of MFA-PAM decreased with increasing pH value when pH<8,and increased with increasing pH value when pH>8.
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基金资助
国家自然科学基金面上项目(51578557);山西省重点研发计划项目-社会发展项目(201903D321065);山西省科技重大专项(20181102004)
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