In this paper,nitrogen-doped graphene (N-G),nitrogen-doped hydrothermal carbon films (N-HC),and nitrogen-doped hydrothermal carbon/graphene composite films (N-HC/G-X,X=1,2,4,5,X represents the mass ratio of pomelo peel pulp (g) to GO (mg)) were prepared via a combined hydrothermal and vacuum filtration process using waste pomelo peel pulp and graphene oxide (GO) as carbon sources,as well as ammonia as dopant.The physicochemical properties of N-G,N-HC and N-HC/G-X were characterized by SEM,XRD,Raman and FTIR,and the experiments of Zn(Ⅱ) adsorption and Cr(Ⅵ) retention were also carried out.Research results showed that:N-G,N-HC and N-HC/G-X were all typical lamellar-like structures.N-HC was a necessary component to obtain the thin films.The film-forming effects of N-HC/G-1 and N-HC/G-2 were better than those of N-HC/G-4 and N-HC/G-5.The film thickness of N-HC/G-1 was about 65 μm,and the mass percentages of C,N and O were 65.63%,15.06% and 19.31%,respectively.N-G,N-HC and N-HC/G-X samples were all amorphous carbon materials.The d002 lamellar spacing of N-HC was the largest.With the increasing of N-G mass in N-HC/G-X samples,the lamellar spacing of N-HC/G-X decreased gradually,while the degree of surface defects and disorder increased.Furthermore,there were a large number of oxygen-containing and nitrogen-containing functional groups on the surface of N-HC/G-X,which could provide more active adsorption sites and improve the adsorption properties of heavy metals.The adsorption effect of N-HC/G-1 and N-HC/G-2 for Zn(Ⅱ) was better than that of N-HC,and the Zn(Ⅱ) adsorption rate on N-HC/G-2 was 79.13%,while the adsorption effect of N-HC/G-4 and N-HC/G-5 for Zn(Ⅱ) was worse than that of N-HC.The interception rate of N-HC and N-HC/G-X for Cr(Ⅵ) increased gradually with the increasing of N-G mass in the composites,while the water flux decreased gradually.The interception rate of N-HC/G-5 for Cr(Ⅵ) reached 86.45%,and the water flux was 18.20L/(m2·h).
Chen Feng, Ma Lulu, Wang Shuwen, Li Ziqian, Zhu Sijia, Li Bingqian
. Study on preparation and properties of nitrogen-doped hydrothermal carbon/graphene composite films[J]. New Chemical Materials, 2023
, 51(11)
: 105
-110
.
DOI: 10.19817/j.cnki.issn1006-3536.2023.11.013
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