The combined method of adsorption-reduction is a promising method for chromium pollution control.In this paper,nanocellulose-polyethylenimine-polypyrrole(CPP-F)photosensitive composite aerogel was prepared by in-situ oxidation polymerization of pyrrole using nanocellulose-polyethylenimine aerogel(CPA)as skeleton.The aerogel was characterized by SEM,FTIR,UV-vis and XPS.The adsorption,in-situ reduction and cyclic adsorption properties of CPP-F composite aerogel on Cr(Ⅵ)were studied by comparing the dark and light conditions,and the cyclic adsorption mechanism was analyzed.The results show that CPP-F is a black porous aerogel with uniform and stable structure,and has strong light absorption effect in ultraviolet,visible and near infrared region.After light treatment,Cr(Ⅲ)content in Cr(Ⅵ)loaded CPP-F increase from 29.76wt%under dark conditions to 72.33wt%,and its reduction rate is 2.43 times that of dark conditions,indicating that polypyrrole(PPy)has excellent photocatalytic performance,and light treatment can promote the in-situ reduction of Cr(Ⅵ).After 6 cycles of adsorption,the cyclic adsorption capacity of Cr(Ⅵ)by CPP-F under light treatment is 64.97%higher than that under dark treatment,indicating that photocatalytic reduction of Cr(Ⅲ)provides a new adsorption site for Cr(Ⅵ)and realizes the cyclic adsorption of Cr(Ⅵ).The combination of adsorption-photocatalytic reduction-cyclic adsorption has more advantages than adsorption method,and has great application potential in Cr(Ⅵ)pollution control.
NETL
NSTL
万方数据
