Carboxymethyl cellulose (CMC) grafted with acrylamide (AM) was prepared via microwave irradiation method where CMC,AM,potassium persulfate/sodium thiosulfate (KPS/Na2S2O3) and N,N′-methylenebisacrylamide (MBA) were used as grafting skeleton,monomer,initiator and cross-linker,respectively.The effects of AM,KPS/Na2S2O3,MBA,and microwave time on adsorption of Cr(Ⅵ) were studied.The functional group type and elemental content of the resin were characterized by means of Fourier transform infrared spectroscopy (FT-IR),non-metallic elemental analyzer and zeta potential,and the surface charge characteristics of the resin were identified.The changes of surface elemental valence of the resin before and after the adsorption of Cr(Ⅵ) were analyzed by X-ray photoelectron spectrometry (XPS).The results showed that adsorption efficiency climbed to 94.60% when microwave power and time were 350W and 8min,respectively,CMC∶AM=1∶8,initiator and cross-linker were 3% and 0.25%,respectively,and the adsorption of Cr(Ⅵ) was in accordance with the Langmuir isothermal adsorption model.Finally,the mechanism of Cr(Ⅵ) adsorption by the resin was analyzed,and the removal of Cr(Ⅵ) was the synergy of electrostatic gravitational force and redox.
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基金资助
国家十三五水体污染控制与治理科技重大专项子任务(2017ZX07101-002-05);山东省自然科学基金项目(ZR2019MEE097)
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