The composite adsorbent of nano-MnO2@graphene(RGO) was prepared,and introduced to remove Pb(Ⅱ) in water.The effects of various factors,including adsorbent dosage,initial ion concentration,pH,and temperature were evaluated.Under the condition of 50mg/L Pb(Ⅱ) ion concentration,0.15g/L nano-MnO2@RGO,pH 6.0,and 3h adsorption time,the removal efficiency of Pb(Ⅱ) ion reached 75% and the adsorption capacity of them reached 124.3mg/g.The adsorption data from our experiments fitted the Langmuir isotherm,and the adsorption kinetics data for nano-MnO2@RGO were better fitted to a pseudo-second-order model,indicating the dominant role of chemisorption.There appeared the characteristic absorption peak of MnO2 in the X-ray diffraction spectrum (XRD) of MnO2@RGO,which adhered to the surface of RGO.It can be concluded that the MnO2@RGO was successfully prepared.
Li Jing, Bao Dongjie, Tian Yunge, Lu Xiuguo, Liu Zhangmeng
. Adsorption performance and mechanism of Pb(Ⅱ) on nano-MnO2@RGO[J]. New Chemical Materials, 2021
, 49(2)
: 195
-199
.
DOI: 10.19817/j.cnki.issn 1006-3536.2021.02.045
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