Boron-doped reduced graphene oxide (B-RGO) was prepared by one pot hydrothermal method using graphene oxide(GO) and boric acid as the carbon precursor and boron source.The physical properties of B-RGO were characterized by scanning electron microscopy (SEM),X-ray diffraction (XRD) and fourier transform infrared spectrum (FT-IR),and its adsorption kinetics and thermodynamics for Cr(Ⅵ) were also studied for the first time.The results showed that B-RGO was nanosheet-like disordered structure carbon,the content of B in B-RGO was 7.16 at%.The surface had oxygen-containing and boron-containing functional groups,which could provide more active adsorption sites.Thus,the adsorption performance of Cr(Ⅵ) by B-RGO was superior to that of RGO and GO.The adsorption kinetics fitted well to the pseudo-second-order model,and the correlation coefficients R2 was 0.992,suggesting that the adsorption of Cr(Ⅵ) by B-RGO was dominated by chemisorption.The intra-particle diffusion model showed that the rate-controlled step was governed by both film-diffusion and intra-particle diffusion.The adsorption isotherms at different temperatures were more consistent with the Langmuir isotherm,with a maximum adsorption quantity of 119mg/g (318K).Moreover,0<RL<1,indicating that the adsorption of Cr(Ⅵ) by B-RGO was a favorable process.The thermodynamic parameters ΔG0<0,ΔH0>0,ΔS0>0,manifesting that the adsorption process was spontaneous,endothermic and randomness.
Chen Feng, Ma Lulu, Zhang Mou, Guo Shihao, Xu Zihao, Ma Pei Liu, Shuaixia
. Kinetic and thermodynamic studies on the adsorption of Cr(Ⅵ) by B-RGO[J]. New Chemical Materials, 2020
, 48(7)
: 139
-144
.
DOI: 10.19817/j.cnki.issn 1006-3536.2020.07.032
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